KR100867056B1 - Copper alloy - Google Patents

Abstract

Cu: 69 to 88 mass%, Si: 2 to 5 mass%, Zr: 0.0005 to 0.04 mass%, P: 0.01 to 0.25 mass%, and Zn: remainder. Content of element a [a] mass% F0 = [Cu] -3.5 [Si] -3 [P] = 61-71, f1 = [P] / [Zr] = 0.7-200, f2 = [Si] / [Zr] = 75-5000 And f3 = [Si] / [P] = 12 to 240, containing an α phase, a κ phase and / or a γ phase, and, with respect to the content [b]% of the phase b in the area ratio, f4 = [α] + [γ] + [κ] ≥ 85 and f5 = [γ] + [κ] + 0.3 [μ]-[β] = 5 ~ 95 to form a metal structure, when melting Copper alloy whose average grain size in the macrostructure of is 200 micrometers or less.

Copper, alloy, phase, melting, solidification, texture, grain size

Description

Copper Alloy {COPPER ALLOY}

The present invention relates to a Cu-Zn-Si-based copper alloy having excellent properties such as castability, mechanical properties (strength, ductility, etc.), corrosion resistance, abrasion resistance, and machinability.

It is known that copper alloys have improved yield strengths by refining grains as in general metallic materials, and the strength thereof is 1/2 of the inverse of the grain size based on the law of the hole-petch. It is said to improve in proportion to the win.

In addition, as a basic form in which the grain size of the copper alloy becomes fine, generally (A) a case where the crystal grains become fine at the time of melt solidification of the copper alloy, and (B) a copper alloy after the melt solidification (ingot, slab or the like) By performing deformation processing such as rolling or heat treatment on cast products such as ingots, die casts, and forged products, such as rolling, accumulated energy such as strain energy may be a driving force, and crystal grains may be refined (A), (B) In either case, Zr is known as an element that effectively acts on the refinement of crystal grains.

However, in the case of (A), since the grain refinement action of Zr in the melt solidification step is greatly influenced by other elements and its content, it is a fact that the desired grain refinement is not achieved. For this reason, the method of (B) is generally used widely, and refinement | miniaturization of a crystal grain is performed by heat-processing an ingot, a cast product, etc. after melt-hardening, and providing a further deformation | transformation.

JP 38-20467 A investigates the average grain size after performing a solution treatment on a copper alloy containing Zr, P, and Ni, followed by cold working at a processing rate of 75%. From 280 micrometers when it does not contain, 170 micrometers (Zr: 0.05 mass% containing), 50 micrometers (Zr: 0.13mass% containing), 29 micrometers (Zr: 0.22mass% containing), 6 micrometers (Zr: 0.99 mass%) It is taught that the finer in proportion to the increase in the content of Zr. Moreover, in this publication, in order to avoid the bad influence by excessive content of Zr, it is proposed to contain 0.05-0.3 mass% of Zr.

In addition, referring to Japanese Patent Laid-Open No. 2004-233952, when the copper alloy to which Zr of 0.15 to 0.5 mass% is added is subjected to deformation processing for solution treatment and deformation addition after casting, the average grain size is about It is disclosed that the micronization is even down to a level of 20 µm or less.

(Patent Document 1) Japanese Patent Application Publication No. 38-20467

(Patent Document 2) Japanese Patent Application Laid-Open No. 2004-233952

Problems to be Solved by the Invention

However, as in the method of (B) above, performing such treatment and processing after casting in order to refine the grain size incurs high cost. Moreover, depending on the shape of the casting product, the deformation process for deformation addition may not be performed. For this reason, it is preferable that the crystal grain is refine | miniaturized at the time of melt-solidifying a copper alloy by the method of said (A). By the way, in the method of (A), as described above, Zr in the melting and solidifying step is greatly influenced by other elements and its content, so that even if the content of Zr is increased, the grain refinement effect corresponding to the increase is increased. It can not be said that. Moreover, since Zr has a very strong affinity with oxygen, when Zr is melt | dissolved and added in air | atmosphere, it is easy to form an oxide and the yield is very bad. For this reason, although the quantity contained in the product after casting is a very small quantity, it is necessary to input a considerable amount of raw material at the casting stage. On the other hand, when the amount of generation of oxide in the melt is too large, the oxide is likely to be swept away during casting, which may cause casting defects. In order to avoid the formation of oxides, it is possible to dissolve and cast in a vacuum or in an inert gas atmosphere, but it incurs high cost. Moreover, since Zr is an expensive element, it is preferable to suppress an addition amount as little as possible from an economic viewpoint.

For this reason, the copper alloy which made the Zr content as small as possible and refine | miniaturized the average grain size in the step after melt-solidification of a casting process is calculated | required.

In the case of Cu-Zn-Si-based copper alloys, Si contributes to the improvement of mechanical properties and the like, but on the other hand, cracks and many holes are likely to occur during melt solidification, and shrinkage holes are large, and blow holes and the like. There was a problem in that casting defects tended to occur. This main reason is that as the content of Si increases, the solidification temperature range (difference between the liquidus temperature and the solidus temperature) becomes wider and the thermal conductivity becomes worse. In addition, when the solidification structure of the conventional Cu-Zn-Si-based copper alloy is observed, dendrite is formed in the shape of a twig, which makes it difficult to open bubbles in which the branch of the dendrite is generated to the atmosphere, and blows the blowhole. It is the cause of retention and the generation of local large shrinkage pores.

This invention is made | formed in view of the said point, Cu-Zn-Si type copper which can significantly improve copper alloy characteristics, such as casting property, mechanical properties, corrosion resistance, machinability, and workability, by refinement | miniaturization of a crystal grain. It is an object of the present invention to provide a method capable of satisfactorily producing the copper alloy while providing an alloy.

Means to solve the problem

The present invention proposes the following copper alloy and its manufacturing method in order to achieve the above object.

That is, in the present invention, first, Cu: 69-88 mass% (preferably 70-84 mass%, more preferably 71.5-79.5 mass%, most preferably 73-79 mass%), and Si: 2-5 mass% (Preferably 2.2 to 4.8 mass%, more preferably 2.5 to 4.5 mass%, most preferably 2.7 to 3.7 mass%), and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more Preferably it is 0.001-0.019mass%, More preferably, it is 0.0025-0.014mass%, Most preferably, 0.004-0.0095 mass%, P: 0.01-0.25mass% (preferably 0.02-0.2mass%, More preferably Preferably it is 0.03 ~ 0.16mass%, most preferably 0.04 ~ 0.12mass%) and Zn: remainder, and the copper alloy (hereinafter referred to as 'first copper alloy') satisfying the following conditions (1) to (7) Is called. In this 1st copper alloy, in addition to the said conditions, it is preferable to satisfy | fill the conditions of following (10)-(15) further. In the case where the first copper alloy requires cutting, in addition to the conditions of (1) to (7) and (10) to (15), it is preferable to further satisfy the condition of (17).

Secondly, the present invention constitutes a composition in which at least one element selected from Sn, As, and Sb is further contained in the element of the first copper alloy, and Cu: 69-88 mass% (preferably 70-84 mass%, more Preferably 71.5-79.5 mass%, most preferably 73-79 mass%), Si: 2-5 mass% (preferably 2.2-4.8 mass%, more preferably 2.5-4.5 mass%, most preferably 2.7 to 3.7 mass%) and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, more preferably 0.0025 to 0.014 mass%, most preferably 0.004 ~ 0.0095mass%), P: 0.01-0.25mass% (preferably 0.02-0.2mass%, more preferably 0.03-0.16mass%, most preferably 0.04-0.12mass%), Sn: 0.05-- 1.5 mass% (preferably 0.1 to 0.9 mass%, more preferably 0.2 to 0.7 mass%, most preferably 0.25 to 0.6 mass%), As: 0.02 to 0.25 mass% (preferably 0.03 to 0.15 mass%) ) And Sb: 0.02 to 0.25 mass% (preferably 0.03 to 0.15 mass%) Proposes a (hereinafter referred to as 'second copper alloy') is made cup portion, the following (1) to the copper alloy satisfying the condition of (7) and at least one selected element, Zn. In this 2nd copper alloy, in addition to the said conditions, it is preferable to satisfy | fill the conditions of following (10)-(15) further. In the case where the second copper alloy requires cutting, in addition to the conditions of (1) to (7) and (10) to (15), it is preferable to further satisfy the condition of (17). .

Third, the present invention constitutes a composition in which at least one element selected from Al, Mn, and Mg is further contained in a component of the first copper alloy, and Cu: 69-88 mass% (preferably 70-84 mass%, more Preferably 71.5-79.5 mass%, most preferably 73-79 mass%), Si: 2-5 mass% (preferably 2.2-4.8 mass%, more preferably 2.5-4.5 mass%, most preferably 2.7 to 3.7 mass%) and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, more preferably 0.0025 to 0.014 mass%, most preferably 0.004 ~ 0.0095mass%), P: 0.01-0.25mass% (preferably 0.02-0.2mass%, more preferably 0.03-0.16mass%, most preferably 0.04-0.12mass%), and Al: 0.02- ~ At least one element selected from 1.5 mass% (preferably 0.1 to 1.2 mass%), Mn: 0.2 to 4 mass% (preferably 0.5 to 3.5 mass%) and Mg: 0.001 to 0.2 mass%, and Zn: Made of copper, which satisfies the following conditions (1) to (7) Proposes a (hereinafter referred to as' third copper alloy "). In this 3rd copper alloy, in addition to the said conditions, it is preferable to satisfy | fill the conditions of following (10)-(15) further. In the case where the third copper alloy requires cutting, in addition to the conditions of (1) to (7) and (10) to (15), it is preferable to further satisfy the condition of (17). .

Fourthly, the present invention provides a composition in which at least one element selected from Sn, As, and Sb and at least one element selected from Al, Mn, and Mg are further contained in the constituent elements of the first copper alloy, and Cu: 69 to 88 mass% (preferably 70 to 84 mass%, more preferably 71.5 to 79.5 mass%, most preferably 73 to 79 mass%), and Si: 2 to 5 mass% (preferably 2.2 to 4.8 mass%, more preferably Preferably 2.5 to 4.5 mass%, most preferably 2.7 to 3.7 mass%, and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, more preferably Is 0.0025 to 0.014 mass%, most preferably 0.004 to 0.0095 mass%, and P: 0.01 to 0.25 mass% (preferably 0.02 to 0.2 mass%, more preferably 0.03 to 0.16 mass%, most preferably 0.04 to 0.12 mass%), Sn: 0.05 to 1.5 mass% (preferably 0.1 to 0.9 mass%, more preferably 0.2 to 0.7 mass%, most preferably 0.25 to 0.6 mass%), As: 0.02 to 0.25 mass% (preferably 0.03 to 0.15 mass%) and Sb: 0. At least one element selected from 02 to 0.25 mass% (preferably 0.03 to 0.15 mass%), and Al: 0.02 to 1.5 mass% (preferably 0.1 to 1.2 mass%) and Mn: 0.2 to 4 mass% ( Preferably at least 0.5-3.5 mass%) and Mg: at least one element selected from 0.001 to 0.2mass%, and Zn: remainder, copper alloy that satisfies the following conditions (1) to (7) 'Fourth copper alloy'). In this 4th copper alloy, in addition to the said conditions, it is preferable to satisfy | fill the conditions of following (10)-(15) further. In the case where the fourth copper alloy requires cutting, in addition to the conditions of (1) to (7) and (10) to (15), it is preferable to further satisfy the condition of (17). .

Fifth, the present invention constitutes a composition in which at least one element selected from Pb, Bi, Se, and Te is further contained in the constituent elements of the first copper alloy, and includes Cu: 69-88 mass% (preferably 70-84 mass%). More preferably 71.5-79.5 mass%, most preferably 73-79 mass%, and Si: 2-5 mass% (preferably 2.2-4.8 mass%, more preferably 2.5-4.5 mass%, most preferred) Preferably 2.7 to 3.7 mass%), and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, more preferably 0.0025 to 0.014 mass%, most preferably Is 0.004 to 0.0095 mass%), P: 0.01 to 0.25 mass% (preferably 0.02 to 0.2 mass%, more preferably 0.03 to 0.16 mass%, most preferably 0.04 to 0.12 mass%), and Pb: 0.005 to 0.45 mass% (preferably 0.005 to 0.2 mass%, more preferably 0.005 to 0.1 mass%), Bi: 0.005 to 0.45 mass% (preferably 0.005 to 0.2 mass%, more preferably 0.005 to 0.1 mass%) mass%), Se: 0.03-0.45mass% (preferably 0.05-0.2mass%, More preferably 0.05 to 0.1 mass%) and Te: 0.01 to 0.45 mass% (preferably 0.03 to 0.2 mass%, more preferably 0.05 to 0.1 mass%) and Zn: The copper alloy which satisfy | fills the conditions of following (1)-(8) is proposed (henceforth a "5th copper alloy"). In this fifth copper alloy, in addition to the above conditions, it is preferable to further satisfy the following conditions (9) to (16). In addition, when the fifth copper alloy requires cutting, in addition to the conditions of (1) to (8) and (9) to (16), it is preferable to further satisfy the condition of (17). .

Sixth, the present invention constitutes a composition in which at least one element selected from Sn, As, and Sb is further contained in a constituent element of the fifth copper alloy, wherein Cu is 69 to 88 mass% (preferably 70 to 84 mass%, more Preferably 71.5-79.5 mass%, most preferably 73-79 mass%), Si: 2-5 mass% (preferably 2.2-4.8 mass%, more preferably 2.5-4.5 mass%, most preferably 2.7 to 3.7 mass%) and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, more preferably 0.0025 to 0.014 mass%, most preferably 0.004 ~ 0.0095mass%), P: 0.01-0.25mass% (preferably 0.02-0.2mass%, more preferably 0.03-0.16mass%, most preferably 0.04-0.12mass%), and Pb: 0.005- ~ 0.45mass% (preferably 0.005 to 0.2mass%, more preferably 0.005 to 0.1mass%), Bi: 0.005 to 0.45mass% (preferably 0.005 to 0.2mass%, more preferably 0.005 to 0.1mass% ), Se: 0.03-0.45mass% (preferably 0.05-0.2mass%, more Preferably 0.05 to 0.1 mass%) and Te: 0.01 to 0.45 mass% (preferably 0.03 to 0.2 mass%, more preferably 0.05 to 0.1 mass%), and Sn: 0.05 ~ 1.5 mass% (preferably 0.1 to 0.9 mass%, more preferably 0.2 to 0.7 mass%, most preferably 0.25 to 0.6 mass%), As: 0.02 to 0.25 mass% (preferably 0.03 to 0.15 mass) %) And Sb: 0.02-0.25 mass% (preferably 0.03-0.15 mass%) and Zn: remainder and copper which satisfy | fills the conditions of following (1)-(8) An alloy (hereinafter referred to as 'sixth copper alloy') is proposed. In this 6th copper alloy, in addition to the said conditions, it is preferable to satisfy | fill the conditions of following (9)-(16) further. In the case where the sixth copper alloy requires cutting, in addition to the conditions of (1) to (8) and (9) to (16), it is preferable to further satisfy the condition of (17). .

Seventh, the present invention constitutes a composition in which at least one element selected from Al, Mn, and Mg is further contained in a constituent element of the fifth copper alloy, wherein Cu is 69 to 88 mass% (preferably 70 to 84 mass%, more Preferably 71.5-79.5 mass%, most preferably 73-79 mass%), Si: 2-5 mass% (preferably 2.2-4.8 mass%, more preferably 2.5-4.5 mass%, most preferably 2.7 to 3.7 mass%) and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, more preferably 0.0025 to 0.014 mass%, most preferably 0.004 ~ 0.0095mass%), P: 0.01-0.25mass% (preferably 0.02-0.2mass%, more preferably 0.03-0.16mass%, most preferably 0.04-0.12mass%), and Pb: 0.005- ~ 0.45mass% (preferably 0.005 to 0.2mass%, more preferably 0.005 to 0.1mass%), Bi: 0.005 to 0.45mass% (preferably 0.005 to 0.2mass%, more preferably 0.005 to 0.1mass% ), Se: 0.03-0.45mass% (preferably 0.05-0.2mass%, more Preferably 0.05 to 0.1 mass%) and Te: 0.01 to 0.45 mass% (preferably 0.03 to 0.2 mass%, more preferably 0.05 to 0.1 mass%), and Al: 0.02 At least one element selected from -1.5 mass% (preferably 0.1-1.2 mass%), Mn: 0.2-4 mass% (preferably 0.5-3.5 mass%) and Mg: 0.001-0.2 mass%, and Zn: The present invention proposes a copper alloy (hereinafter referred to as 'seventh copper alloy'), which is made of negative parts and satisfies the following conditions (1) to (8). In this seventh copper alloy, in addition to the above conditions, it is preferable to further satisfy the following conditions (9) to (16). In the case where the seventh copper alloy requires cutting, in addition to the conditions (1) to (8) and (9) to (16), it is preferable to further satisfy the condition of (17). .

Eighth, the present invention constitutes a composition in which at least one element selected from Sn, As, and Sb and at least one element selected from Al, Mn, and Mg are further contained in a constituent element of the fifth copper alloy, wherein Cu: 69 to 88 mass% (preferably 70 to 84 mass%, more preferably 71.5 to 79.5 mass%, most preferably 73 to 79 mass%), and Si: 2 to 5 mass% (preferably 2.2 to 4.8 mass%, more preferably Preferably 2.5 to 4.5 mass%, most preferably 2.7 to 3.7 mass%, and Zr: 0.0005 to 0.04 mass% (preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, more preferably Is 0.0025 to 0.014 mass%, most preferably 0.004 to 0.0095 mass%, and P: 0.01 to 0.25 mass% (preferably 0.02 to 0.2 mass%, more preferably 0.03 to 0.16 mass%, most preferably 0.04 to 0.12 mass%), Pb: 0.005 to 0.45 mass% (preferably 0.005 to 0.2 mass%, more preferably 0.005 to 0.1 mass%), Bi: 0.005 to 0.45 mass% (preferably 0.005 to 0.2 mass) mass%, more preferably 0.005 to 0.1 mass%), Se: 0.03 to 0.45 mass% (preferably 0.05 to 0.2 mass%, more preferably 0.05 to 0.1 mass%) and Te: 0.01 to 0.45 mass% (preferably 0.03 to 0.2 mass%, more preferably 0.05 At least one element selected from -0.1 mass%), and Sn: 0.05-1.5 mass% (preferably 0.1-0.9 mass%, more preferably 0.2-0.7 mass%, most preferably 0.25-0.6 mass) %), At least one element selected from As: 0.02 to 0.25 mass% (preferably 0.03 to 0.15 mass%) and Sb: 0.02 to 0.25 mass% (preferably 0.03 to 0.15 mass%), and Al: At least one element selected from 0.02 to 1.5 mass% (preferably 0.1 to 1.2 mass%), Mn: 0.2 to 4 mass% (preferably 0.5 to 3.5 mass%) and Mg: 0.001 to 0.2 mass%, and Zn: It proposes the copper alloy which consists of remainder and satisfy | fills the conditions of following (1)-(8) (henceforth "8th copper alloy"). In this eighth copper alloy, in addition to the above conditions, the following conditions (9) to (16) are preferably further satisfied. In the case where the eighth copper alloy requires cutting, in addition to the conditions of (1) to (8) and (9) to (16), it is preferable to further satisfy the condition of (17).

In addition, in the following description, [a] shows the content value of the element a, and content of the element a is represented by [a] mass%. For example, content of Cu is [Cu] mass%. In addition, [b] shows content value by the area ratio of phase b, and content (area rate) of phase b is represented by [b]%. For example, content (area rate) of an alpha phase is represented by [(alpha)]%. In addition, the area ratio which is the content of each image b is measured by image analysis, and specifically, it is calculated | required by binarizing 200 times of optical microscope structure | tissues with image processing software "WinROOF" (the technical company). It is the average of the area ratios measured at 3 o'clock.

F0 = [Cu] -3.5 [Si] -3 [P] +0.5 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te])-0.5 ([Sn] + [As ] + [Sb])-1.8 [Al] +2 [Mn] + [Mg] = 61-71 (preferably f0 = 62-69.5, More preferably, f0 = 62.5-68.5, Most preferably f0 = 64 to 67). In f0, the element a not containing is set to [a] = 0.

(2) f1 = [P] / [Zr] = 0.7 to 200 (preferably f1 = 1.2 to 100, more preferably f1 = 2.3 to 50, most preferably f1 = 3.5 to 30).

(3) f2 = [Si] / [Zr] = 75 ~ 5000 (preferably f2 = 120 ~ 3000, more preferably f2 = 180 ~ 1500, most preferably f2 = 300 ~ 900).

(4) f3 = [Si] / [P] = 12 to 240 (preferably f3 = 16 to 160, more preferably f3 = 20 to 120, most preferably f3 = 25 to 80).

(5) It contains alpha phase, κ phase, and / or γ phase, and f4 = [alpha] + [gamma] + [κ] ≥85 (preferably f4≥95). In f4, the phase b not containing is set to [b] = 0.

(6) f5 = [γ] + [κ] +0.3 [μ]-[β] = 5-95 (preferably f5 = 10-70, more preferably f5 = 15-60, most preferably f5 = 20 ~ 45). In f5, the phase b not containing is set to [b] = 0.

(7) The mean grain size in the macrostructure at the time of melt solidification should be 200 µm or less (preferably 150 µm or less, more preferably 100 µm or less, most preferably 50 µm or less). Here, the average grain size in the macrostructure (or microstructure) during melt solidification means casting (mould casting, sand casting, horizontal continuous casting, upward casting (up-casting), After casting by solidification by various known casting methods such as semi-melt casting, semi-melt forging, melt forging), or by welding or melting, deformation processing (extrusion, rolling, etc.) or heating The mean value of the grain sizes of macrostructures (or microstructures) in the state where no treatment is applied at all. In addition, the term "casting" to "casting" used in the present specification means that completely or partially dissolved and solidified, including ingots, slabs and billets for rolling or extrusion, for example, sand castings. , Die casting, low pressure casting, diecast, lost wax, semisolid casting (eg thixotropic casting, leo casting), semi-molten molding, squeeze, centrifugal casting, continuous casting casting (eg horizontal continuous casting, up Word, upcast bar, hollow bar, mold release bar, mold release hollow bar, coil material, wire rod, etc.), melt forging (direct forging), thermal spraying, build-up spraying, lining, casting by overlay Can be. Moreover, also about welding, since it is what melt | dissolves, solidifies, connects, and fits a part of a base material, it should be understood that it is contained in a casting in a broad sense.

(8) f6 = [Cu] -3.5 [Si] -3 [P] + 3 ([Pb] + 0.8 ([Bi] + [Se]) + 0.6 [Te]) ^1/2 ≥ 62 (preferably f6 ≧ 63.5), and f7 = [Cu] -3.5 [Si] -3 [P] -3 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) ^1/2 ≦ 68.5 (Preferably f7≤67). In addition, in f6 and f7, the element a not containing is made [a] = 0.

(9) f8 = [γ] + [κ] + 0.3 [μ]-[β] + 25 ([Pb] + 0.8 ([Bi] + [Se]) + 0.6 [Te]) ^1/2 ≥ 10 ( Preferably f8 ≧ 20), and f9 = [γ] + [κ] +0.3 [μ]-[β] -25 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te] ) ^1/2 ≤ 70 (preferably f9 ≤ 50). In f7 and f8, the element a or phase b not containing is set to [a] = 0 or [b] = 0.

(10) The primary crystal at the time of melting solidification should be α phase.

(11) At the time of melt solidification, a foaming reaction should occur.

(12) At the time of melting solidification, the dendrite network is divided into crystal structures, and the two-dimensional form of crystal grains is circular, non-circular, near-circular, elliptical, cross-shaped, needle-shaped or polygonal. To be achieved.

(13) The α phase of the matrix is finely divided, and the κ phase and / or γ phase are uniformly dispersed in the matrix.

(14) In a semi-molten state of 30% to 80% solid state, at least the dendrite network forms a crystal structure, and the solid two-dimensional form is circular, near-circular, non-circular, elliptical, and cross-shaped. Or polygonal.

(15) in a semi-molten state with a solid phase rate of 60%, the average grain size of the solid phase is 150 µm or less (preferably 100 µm or less, more preferably 50 µm or less, most preferably 40 µm or less), and / Or the average maximum length of the solid phase is 200 µm or less (preferably 150 µm or less, more preferably 100 µm or less, most preferably 80 µm or less).

(16) When Pb or Bi is contained, fine and uniform Pb particles or Bi particles should be uniformly dispersed in the matrix. Specifically, the average particle diameter of the Pb particles or Bi particles is preferably 1 μm or less (but the maximum particle size does not exceed 3 μm (preferably 2 μm)).

(17) Inclination angle: -6 ° and nose radius: dry by the lathe using a bite of 0.4 mm, cutting speed: 80 to 160 m / min, cutting depth: 1.5 mm and feed speed: 0.11 mm / rev. In the case of cutting by cutting, the cutting pieces to be formed should be in the form of trapezoidal or triangular small pieces (FIG. 5A), tapes of 25 mm or less in length (FIG. 5B) or needles (FIG. 5C).

In the first to eighth copper alloys, Cu is a main element of the copper alloy, and in order to secure corrosion resistance (de-zinc corrosion resistance, stress corrosion cracking resistance) and mechanical properties as industrial materials, 69 mass% It is necessary to contain more. However, when Cu content exceeds 88 mass%, there exists a possibility that intensity | strength and abrasion resistance may fall, and the refinement | miniaturization effect of the crystal grain by the co-addition of Zr and P mentioned later may be impaired. In view of this point, the Cu content is required to be 69 to 88 mass%, preferably 70 to 84 mass%, more preferably 71.5 to 79.5 mass%, and most preferably 73 to 79 mass%. It is good to leave. In addition, in order to refine the crystal grains, it is necessary to give importance to the relationship with other containing elements, and to satisfy the condition of (1). That is, f0 = [Cu] -3.5 [Si] -3 [P] +0.5 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te])- 0.5 ([Sn] + [As] + [Sb])-1.8 [Al] +2 [Mn] + [Mg] = 61-71 needs to be established and it is preferable that f0 = 62 ~ 69.5 It is more preferable that it is f0 = 62.5-68.5, and it is most preferable that f0 = 64-67. The lower limit of f0 is also a value related to whether or not the primary is in the α phase, and the upper limit of f0 is also a value related to the positive reaction.

In the first to eighth copper alloys, Zn, together with Cu and Si, is a main element of the copper alloy, lowers the lamination defect energy of the alloy, causes a crystallization reaction to refine the crystallization of molten solids, improves fluidity of the melt, and In addition to the action of lowering the melting point, preventing the oxidation loss of Zr, improving the corrosion resistance, and improving the machinability, the mechanical strength such as tensile strength, proof strength, impact strength, and fatigue strength is also improved. Taking these points into consideration, the content of Zn is the remainder obtained by subtracting the content of each constituent element.

In the first to eighth copper alloys, Si is an element that co-adds with Zr, P, Cu, and Zn to lower the stacking defect energy of the alloy, widen the composition range to which the crystal reaction is applied, and exhibit a significant grain refinement effect. The addition amount exerts an effect at 2% or more. However, even when more than 5% of Si is added, grain refining action due to co-addition with Cu and Zn tends to be saturated or vice versa, further leading to ductility deterioration. Moreover, when Si content exceeds 5%, thermal conductivity will fall, there exists a possibility that a casting solidification temperature range may become large and casting property may worsen. Moreover, Si has the effect | action which improves the fluidity | liquidity of a molten metal, prevents oxidation of a molten metal, and lowers a melting point. In addition, it has the effect of improving the corrosion resistance, in particular, de-zinc corrosion resistance and stress corrosion cracking resistance. In addition, it contributes to the improvement of machinability and mechanical strength such as tensile strength, bearing strength, impact strength, fatigue strength. This action produces a synergistic effect on the refinement of the grains of the casting. In order for such a Si addition function to be effectively exhibited, it is necessary to set it as 2-5 mass% on condition that it satisfy | fills (1), and it is preferable to set it as 2.2-4.8 mass%, and it is 2.5%-4.5 It is preferable to set it as%, and it is most preferable to set it as 2.7-3.7 mass%.

In the first to eighth copper alloys, Zr and P are co-added for the purpose of miniaturizing the copper alloy crystal grains, in particular, miniaturization of the crystal grains during melt solidification. In other words, Zr and P alone, like other common additive elements, can barely achieve the miniaturization of the copper alloy grains, but exhibit a very effective grain refinement function in the coexistence state.

Such micronized function is exhibited at 0.0005 mass% or more with respect to Zr, effectively exhibited at 0.0008mass% or more, remarkably exhibited at 0.001mass% or more, more remarkably at 0.0025mass% or more, and 0.004mass. It is very remarkable at% or more, it is exerted at 0.01 mass% or more for P, is remarkably exerted at 0.02 mass% or more, more remarkably at 0.03 mass% or more and very remarkably at 0.04 mass% or more Will be exercised.

On the other hand, when the amount of Zr added reaches 0.04 mass% and the amount of P added reaches 0.25 mass%, the refining function of the grains due to the co-addition of Zr and P becomes completely saturated regardless of the type and content of other constituent elements. Therefore, the addition amount of Zr and P necessary for effectively exerting such a function needs to be 0.04 mass% or less with respect to Zr, and 0.25 mass% or less with respect to P. In addition, Zr and P are trace amounts set in the above-mentioned range, so long as they do not impair the alloy properties exhibited by other constituent elements. For example, even when Sn is contained, the crystal grains are finely refined by? The portion of the high Sn concentration which is first distributed in the phase can be uniformly distributed in the matrix rather than in a continuous manner. As a result, it is possible to prevent casting cracks, to obtain sound castings having many holes, shrinkage holes, blow holes, and micro porities, and to improve the processing performance of cold drawing and cold drawing performed after casting. It can improve and the characteristic of the said alloy can be improved further. In addition, from the viewpoint of industrially adding a very small amount of Zr, addition of more than 0.019 mass% of Zr does not exert a further effect of refining grains. If it exceeds 0.029 mass%, there is a fear that the refining effect of crystal grains will be impaired. If the content exceeds 0.04 mass%, the grain refinement effect is apparently lost.

In addition, since Zr has a very high affinity with oxygen, when it is melted in the air or when scrap material is used as a raw material, Zr tends to be an oxide or sulfide of Zr, and when Zr is added excessively, the viscosity of the molten metal becomes high and cast. Casting defects due to oxides, sulfides swept away, etc. are generated, and blow holes and microporosity are easily generated. In order to avoid this, it is conceivable to melt and cast in a vacuum or a completely inert gas atmosphere. However, this decreases the versatility and significantly increases the cost in the copper alloy in which Zr is added only as a refiner. In view of this point, it is preferable to add Zr, which does not form as an oxide or sulfide, to 0.029 mass% or less, more preferably 0.019 mass% or less, and most preferably, 0.014 mass% or less. Preferably, it is optimal to set it as 0.0095 mass%. In addition, if the amount of Zr is in this range, the copper alloy is dissolved in the air as a recycled material without adding a new material (when cast using a raw material composed only of the recycled material). Formation decreases, and it becomes possible to obtain the healthy 1st-8th copper alloy comprised from microcrystal grains again.

In this regard, the Zr addition amount needs to be 0.0005 to 0.04 mass%, preferably 0.0008 to 0.029 mass%, more preferably 0.001 to 0.019 mass%, and 0.0025 to 0.014 mass%. It is most preferable to set it as 0.004 to 0.0095 mass%.

As described above, P is contained in order to exert a crystallization function of crystal grains by co-addition with Zr, but also affects corrosion resistance, castability, and the like. Therefore, in consideration of the effects on the corrosion resistance, castability, etc. in addition to the finer function of the crystal grains by co-addition with Zr, it is necessary to set the P addition amount to 0.01 to 0.25 mass%, and to make 0.02 to 0.2 mass%. Preferably, it is more preferable to set it as 0.03-0.16 mass%, and it is optimal to set it as 0.04-0.12 mass%. Moreover, although P is important in relation to Zr, even if it adds more than 0.25 mass%, the refinement | miniaturization effect is small and rather it is unpreferable since it impairs ductility.

Further, the effect of miniaturization of the crystal grains by co-addition of Zr and P is not exhibited only by determining the contents of Zr and P in the above-mentioned ranges, but satisfying the condition of (2) in these mutual contents. need. The refinement of the grains is achieved by the rate of nucleation of the α phase of the primary crystallized from the melt far exceeding the growth rate of the dendrite crystals. To generate this phenomenon, it is insufficient to determine the amount of Zr and P added separately. It is necessary to consider the co-addition ratio f1 = [P] / [Zr]. By determining the content of Zr and P to be an appropriate addition ratio in an appropriate range, crystal formation of the primary α phase can be significantly promoted by the coadding function or interaction of Zr and P. As a result, the nucleation of the α-phase far exceeds the growth of the dendrite crystals. When the content of Zr and P is in an appropriate range and the compounding ratio ([P] / [Zr]) is stoichiometric, the intermetallic compound of Zr and P in the crystal of α phase by addition of trace amounts of Zr in the order of several tens of ppm (For example, ZrP, ZrP _{1 -x} ) may be generated. The nucleation rate of the α-phase is increased by the value f1 of [P] / [Zr] of 0.7 to 200, the degree is further increased by the value of f1 = 1.2 to 100, and markedly higher by the value of f1 = 2.3 to 50, f1 = 3.5 to 30, which is dramatically higher. That is, the co-addition ratio f1 of Zr and P is an important factor in achieving refinement of crystal grains, and when f1 is in the above range, crystal nucleation during melting solidification greatly exceeds crystal growth. In addition, in order to refine the crystal grains, the ratio (f2 = [Si] / [Zr] and f3 = [Si] / [P]) of the amount of co-addition of Zr, P and Si is of course sufficiently important and needs to be considered.

As the melting solidification proceeds and the ratio of the solid phase increases, crystal growth begins frequently, coalescence of crystal grains starts to occur in part, and the α phase crystal grains usually increase. Thus, if a cladding reaction occurs in the process of solidifying the melt, the remaining liquid without solidification reacts with the solid phase α phase, and the β phase is generated while the solid phase α is eroded. As a result, the α phase is surrounded by the β phase, the grain size of the α phase itself becomes smaller, and the shape thereof also becomes an elliptical shape without an edge. When the solid phase becomes such a fine elliptical phase, the gas is also easily released, has resistance to cracks due to solidification shrinkage when solidified, shrinkage occurs smoothly, and also has good effects on properties such as strength and corrosion resistance at room temperature. Naturally, if the solid phase is a fine ellipsoid, the fluidity is good and it is most suitable for the anti-melt solidification method. If the solid and the fine elliptic phase remain in the final stage of solidification, the solid and the melt are sufficiently supplied to every corner of the complex mold. This outstanding casting is made. That is, it is molded to near-net-shape. In addition, whether or not a trapping reaction is applied generally occurs in a composition which is wider than the equilibrium state, unlike the equilibrium state in practical use. Here, the relation f0 plays an important role, and the upper limit of f0 is mainly related to the grain size after melt solidification and the measure to which the trapping reaction is applied. The lower limit of f0 mainly relates to the boundary between the crystal size after melting and solidification and whether or not the primary phase is alpha phase. As f0 becomes the above-mentioned preferred range (f0 = 62 to 66.5), more preferred range (f0 = 62.5 to 68.5), and optimum range (f0 = 64 to 67), the amount of primary α phase increases, and in the non-equilibrium reaction The trapping reaction that occurs takes place more actively, and as a result the grains obtained at room temperature become smaller.

This series of melt freezing phenomena depends naturally on the cooling rate. That is, in the case of rapid cooling of an order of 10 ⁵ deg. C / sec or more, the crystal grains may not be fined because there is no time for nucleation of crystals, and at a slow cooling rate of an order of 10 ^-3 deg. C / sec or less, Since growth or coalescence of grains is promoted, there is a fear that the grains will not be miniaturized. In addition, since the state of equilibrium is approached, the composition range to which the trapping reaction is applied also becomes small. More preferably, the cooling rate in the melt solidification step is in the range of 10 ⁻² to 10 ⁴ ° C./sec, and most preferably in the range of 10 ⁻¹ to 10 ³ ° C./sec. As the cooling rate nears the upper limit among the ranges of such cooling rates, the composition region where the grains become finer becomes wider, and the grains become finer. The β phase produced in the clathrate reaction has a grain growth inhibitory effect. Also, when the β phase and / or γ phase precipitate and form by the reaction in the solid phase without the β phase disappearing at a high temperature, the crystal occupies a large proportion. Not only inhibits growth, but also makes the α grains finer. Conditional formulas for this are f4 = [α] + [γ] + [κ] and f5 = [γ] + [κ] +0.3 [μ]-[β], and f5 is the above-mentioned preferred range (f5 = 10 to 70). ), The more preferable range (f5 = 15-60) and the optimum range (f5 = 20-45), the grain becomes finer. F6 and f7 in condition (8) are similar to f0, and f8 in (9) is similar to f5, so satisfying the conditions of (8) and (9) is the condition of (1) for f0. And satisfies the condition (6) for f5. In addition, the κ phase and γ phase formed from the Cu-Zn-Si alloy of the composition range specified in the present invention are Si-rich hard phases, but the κ phase and γ phase serve as stress concentration sources during cutting and have a thickness. A thin sheared cutting piece is produced to obtain a divided cutting piece. At the same time, a lower cutting resistance value is obtained as a result. Therefore, even if there is no presence of hard Pb particles or Bi particles as machinability improving elements (even if they do not contain machinability improving elements such as Pb and Bi), the κ phase and γ phase are uniformly distributed. Machinability can be obtained. The condition for exerting the machinability improving effect not dependent on such machinability improving elements such as Pb is the condition of (1), and the condition of (6) with respect to f5. By the way, in recent years, high cutting is required, and since hard κ phase, γ phase, and soft Pb particles or Bi particles are uniformly dispersed and coexist in a matrix, a particularly synergistic effect is exhibited under high cutting conditions. In order to exhibit such a coadding effect, it is necessary to satisfy the condition of (8), and it is preferable to satisfy the condition of (9).

As can be understood from the above point, in the first to eighth copper alloys, at least the conditions of (1) to (6) can be satisfied so that even a molten solid, crystal grains such as a hot worked material or a recrystallized material can be achieved. , The crystal grains can be further refined by satisfying the conditions of (10). In addition, in the fifth to eighth copper alloys, by satisfying the conditions (8) (preferably, the conditions of (9) further), refinement of crystal grains is achieved while improving the machinability by the addition of a trace amount such as Pb. We can plan. In addition, the κ phase and the γ phase are phases with a higher Si concentration than the α phase, and when these phases do not reach 100%, the balance generally includes at least one phase among the β phase, the μ phase, and the δ phase.

In the fifth to eighth copper alloys, Pb, Bi, Se, and Te, as is well known, improve the machinability, and in a frictional engagement member such as a bearing, improve affinity and sliding properties with the mating member. Demonstrates excellent wear resistance. In order to exert such a function, a large amount of Pb or the like is required. However, since the conditions of (8) are satisfied with the refinement of the crystal grains, even if Pb or the like is not added in a large amount, industrially satisfactory machinability is achieved. Can be secured. In order to further improve the machinability by the addition of such a small amount of Pb, it is preferable to satisfy the conditions of (9) and (16) in addition to the condition of (8). By satisfying these conditions, finer grains and particles such as Pb are finer and dispersed in a matrix with a uniform size, so that the machinability can be improved even if a large amount of Pb or the like is not required. The effect is remarkably exhibited under the high-speed cutting conditions, together with the presence of hard κ phase, γ phase, and unemployed soft Pb and Bi formed in the present composition range effective for machinability. Generally, Pb, Bi, Se, Te is added alone or co-added with Pb and Te, Bi and Se or any combination of Bi and Te. On the condition that (8) and the like are satisfied in this respect, the amount of Pb added needs to be 0.005 to 0.45 mass%, preferably 0.005 to 0.2 mass%, preferably 0.005 to 0.1 mass%. More preferred. The amount of Bi added needs to be 0.005 to 0.45 mass%, preferably 0.005 to 0.2 mass%, and more preferably 0.005 to 0.1 mass%. In addition, the addition amount of Se needs to be 0.03-0.45 mass%, It is preferable to set it as 0.05-0.2 mass%, It is more preferable to set it as 0.05-0.1 mass%. In addition, the amount of Te needs to be 0.01 to 0.45 mass%, preferably 0.03 to 0.2 mass%, and more preferably 0.05 to 0.1 mass%.

By the way, Pb and Bi are not solid-solution at room temperature and are not only present as Pb particles or Bi particles, but also distributed in the form of particles in a molten state even in the melt solidification step, and exist between solid phases. The larger the number, the more likely cracking occurs in the melt-solidification step (by tensile stress due to shrinkage due to solidification). In addition, since Pb and Bi exist mainly in a molten state even after solidification, when there are many such particles, high temperature cracking is easy to occur. In order to solve such a problem, it is very effective to refine the grains to relieve stress (and to increase the grain boundary area) and to distribute the particles of Pb and Bi in a small and uniform manner. As described above except for machinability, Pb and Bi adversely affect the copper alloy characteristics, and ductility is also impaired by stress concentration on Pb and Bi particles even at ductility at room temperature. It goes without saying that the ductility is impaired). It should be noted that such a problem can be solved by miniaturization of grains.

In the second, fourth, sixth and eighth copper alloys, Sn, As and Sb are mainly added to improve the corrosion resistance and the corrosion resistance (especially the de-zinc corrosion resistance). This function is exhibited by adding at least 0.05 mass% to Sn and at least 0.02 mass% to Sb and As. However, even if Sn, As, and Sb are added in excess of a certain amount, a reasonable effect is not obtained, and ductility is lowered. In addition, Sn alone has little effect on the miniaturization effect, but in the presence of Zr and P, it is possible to exert the function of refining the crystal grains. Sn improves mechanical properties (strength, etc.), corrosion resistance, and abrasion resistance, and also has a function of separating dendrite branches and broadening the composition region of Cu or Zn, which causes the foaming reaction, to perform more effective foaming reactions. To reduce the lamination defect energy. As a result, the granulation and refinement of the crystal grains are realized more effectively. Sn is a low melting point metal and forms a thickened image or a thickened portion of Sn even with a small amount of addition and impairs castability. However, when Sn is added under the addition of Zr and P, the grains are refined together with the grain refinement effect by Sn, and even though the thickened portion of Sn is formed, the thickened image is uniformly dispersed, thereby not significantly impairing castability or ductility. Excellent corrosion resistance. In order to exhibit the corrosion resistance effect, the Sn addition amount is required to be 0.05% or more, preferably 0.1% or more, more preferably 0.25% or more. On the other hand, when the Sn addition amount exceeds 1.5%, no matter how much the grains are refined, problems arise in castability and ductility at room temperature. Therefore, preferably 0.9% or less, more preferably 0.7% or less, and optimally 0.6% or less. to be. The amount of Sn added needs to be 0.05 to 1.5 mass%, preferably 0.1 to 0.9 mass%, more preferably 0.2 to 0.7 mass%, and preferably 0.25 to 0.6 mass%. to be. In addition, the addition amount of As and Sb needs to be set at 0.02 to 0.25 mass% in consideration of toxic effects adversely affecting the human body, and it is preferable to set it as 0.03 to 0.15 mass%.

In the third, fourth, seventh, and eighth copper alloys, Al, Mn, and Mg are mainly added to improve strength, improve fluidity, deoxidation, desulfurization effect, improve corrosion resistance and high wear resistance at high flow rates. do. In addition, Al forms a strong Al-Sn corrosion resistant film on the casting surface to improve wear resistance. Mn also has the effect of producing a corrosion resistant film between Sn and Sn. In addition, Mn combines with Si in the alloy to form an intermetallic compound of Mn-Si (1: 1 or 2: 1 in atomic ratio), and has an effect of improving the wear resistance of the alloy. By the way, a scrap material (a waste heat transfer pipe etc.) is often used as a part of a copper alloy raw material, and these scrap materials often contain S component (sulfur component). Phosphorus Zr forms sulfides and the effective grain refining function by Zr may be lost, and fluidity is lowered, and casting defects such as blow holes and cracks are likely to occur. In addition to the corrosion resistance improvement function, Mg has a function which improves the fluidity | liquidity at the time of casting, even when the scrap material containing such an S component is used as an alloy raw material. In addition, Mg can remove the S component in the form of more harmless MgS, and this MgS is not harmful to corrosion resistance even if it remains in the alloy, but effectively reduces the corrosion resistance due to the inclusion of the S component in the raw material. You can prevent it. Moreover, when S component is contained in a raw material, S tends to exist in a grain boundary and grain boundary corrosion may arise, but grain boundary corrosion can be prevented effectively by Mg addition. Al and Mn are also inferior to Mg, but have an effect of removing the S component contained in the molten metal. In addition, when the amount of oxygen in the molten metal is large, Zr may form oxides and lose the refining function of crystal grains. However, Mg, Al, and Mn also have an effect of preventing the formation of oxides of Zr. In consideration of this point, the content of Al, Mn, and Mg falls within the above-described range. In addition, Z concentration may be consumed by S due to the high S concentration of the molten metal. If Mg is contained in the molten metal prior to Zr loading, the S component in the molten metal is removed or fixed in the form of MgS. Does not occur. However, when Mg is added in excess of 0.2 mass%, casting defects may occur, such as oxidation due to oxidization, high viscosity of the molten metal, and oxides swept away. Considering these points and the improvement of strength, corrosion resistance, and abrasion resistance, the amount of Al added must be 0.02 to 1.5 mass%, and preferably 0.1 to 1.2 mass%. In addition, the amount of Mn added should be 0.2-4 mass% in consideration of the effect of improving the wear resistance by forming intermetallic compounds (1: 1 or 2: 1 in atomic ratio) of Si and MnSi in the alloy. , 0.5 to 3.5 mass% is preferable. It is necessary to add Mg 0.001-0.2mass%.

In the first to eighth copper alloys, Zr and P are added to realize finer grains, and the condition (7) is satisfied, that is, the average grain size in the macrostructure at the time of melt solidification is 200 μm or less ( Preferably it is 150 micrometers or less, More preferably, it is 100 micrometers or less, optimally 50 micrometers or less in microstructure), and high-quality casting can be obtained, and it is continuous, such as horizontal continuous casting and upward (upcast), etc. The casting by casting and its practical use also become possible. If the crystal grains are not refined, a plurality of heat treatments are required in order to solve the peculiarity of the casting-specific dendrite structure, the division of the κ phase, the γ phase, and the granularity. In the case where the crystal grains have been refined as described above, segregation is only microscopic, so that such heat treatment does not need to be performed, and the surface state is also good. In addition, since the κ phase and the γ phase are mainly present at the phase boundary with the α phase, the finer and more uniformly dispersed, the shorter the phase length is. Therefore, a special treatment step for dividing the κ phase and γ phase If not needed or required, the process can be minimized. In this way, the number of steps required for manufacturing can be greatly reduced, and the manufacturing cost can be reduced as much as possible. Moreover, when the condition of (7) is satisfied, the following problems do not arise and the outstanding copper alloy characteristic is exhibited. That is, when the κ phase and γ phase are unevenly distributed, cracks are likely to occur due to the difference in strength with the α phase of the matrix, and the ductility at room temperature is also impaired. In addition, since particles of Pb and Bi are originally present at the boundary with the α phase and grain boundaries, solidification cracks easily occur when the phase is large, and ductility at room temperature is also impaired.

In addition, the conditions (13) (in the fifth to eighth copper alloys, the conditions of (16) are further satisfied), and the κ phase, γ phase, Pb, and Bi particles are uniform in size, uniform in the matrix. If it is distributed, of course, cold workability will be improved, so that the first to eighth copper alloy castings require caulking (for example, in a hose nipple, when caulking is performed during installation work). Can be used very suitably.

Moreover, in the 1st-8th copper alloy casting, although a scrap material may be used for a raw material, when such scrap material is used, an impurity may inevitably be contained and is practically acceptable. However, in the case where the scrap material is a nickel plating material or the like, when Fe and / or Ni is contained as an unavoidable impurity, it is necessary to limit the content thereof. In other words, if the content of such impurities is large, Zr and P, which are useful for refining the crystal grains, are consumed by Fe and / or Ni, so that even if Zr and P are added excessively, there is a disadvantage of inhibiting the refining effect of the crystal grains. Therefore, when either of Fe and Ni is contained, the content is limited to 0.3 mass% or less (preferably 0.2 mass% or less, more preferably 0.1 mass% or less, optimally 0.05 mass% or less). It is preferable. In addition, when Fe and Ni are contained together, the total content thereof is limited to 0.35 mass% or less (preferably 0.25 mass% or less, more preferably 0.15 mass% or less, optimally 0.07 mass% or less). It is preferable.

In a preferred embodiment, the first to eighth copper alloys are provided, for example, as a cast obtained in a casting step or as a plastic processed product in which at least one plastic working is performed.

The casting is provided, for example, as a wire rod, a rod, or a hollow rod cast by the horizontal continuous casting method, the upward method, or the upcast method, and as cast in a near net shape. It is also provided as a casting, a semi-molten casting, a semi-molten molding, a molten metal forging or a die cast molding. In this case, it is preferable to satisfy the conditions of (14) and (15). If the solid phase is granulated in the semi-melt state, it is naturally excellent in the semi-melt casting property, and favorable semi-melt casting can be performed. In addition, the fluidity of the melt including the solid phase in the final solidification step mainly depends on the shape of the solid phase in the semi-melt state and the viscosity of the liquid phase to the composition of the liquid phase, but the moldability by casting (when high precision or complex shape is required) Edo (solid shape) has a large influence on whether or not a healthy casting can be cast). In other words, if the solid phase begins to form a network of dendrites in the semi-melt state, the melt containing the solid phase is difficult to spread evenly throughout the corners, resulting in poor moldability due to casting, resulting in high-precision castings or complex shapes. It is difficult to get a casting. On the other hand, the solid phase in the semi-molten state is granulated, and the closer it is to spheroidization (circular shape in a two-dimensional form), and the smaller the particle size is, the castability including anti-melt castability is. It is excellent in that it is possible to obtain a healthy high-precision casting or a casting of a complicated shape (a high quality semi-molten casting can of course be obtained). Therefore, anti-melt castability can be evaluated by recognizing the shape of the solid phase in the semi-molten state, and the other characteristics of the castability (complex castability, precision castability, and forging of melt shape) are determined by the anti-melt castability. Good health can be confirmed. Generally, in the semi-melt state of 30 to 80% of solid state, at least a dendrite network forms the crystal | crystallization structure, and the solid two-dimensional form is circular shape, the non-circular non-circle shape, elliptical shape, cross When forming a shape or polygonal shape, it can be said that semi-melt casting property is favorable, and especially in the semi-melt state of 60% of solid phase rate, the average grain size of the said solid phase is 150 micrometers or less (preferably 100 micrometers). Or less, more preferably 50 µm or less, optimally 40 µm or less, and the average maximum length of the solid phase is 300 µm or less (preferably 150 µm or less, more preferably 100 µm or less, optimally 80 µm) Or less) (especially in the elliptical shape, the average long side and short side ratio is 3: 1 or less (preferably 2: 1 or less)). Can be.

Moreover, a plastic workpiece is provided as a hot extrusion workpiece, a hot forging workpiece, or a hot rolling workpiece, for example. Moreover, the casting mentioned above is provided as a wire rod, a rod material, or a hollow rod formed by drawing or drawing. In addition, in the case of being provided as a plastic workpiece obtained by cutting, that is, a cutting workpiece, the conditions of (17) must be satisfied, i.e., dry by a lathe using a bite having an inclination angle of -6 ° and a nose radius of 0.4 mm. , Cutting speed: 80 to 160 m / min, cutting depth: 1.5 mm and feed speed: 0.11 mm / rev. In the case of cutting under the condition of a trapezoidal or triangular small piece, tape shape or needle of 25 mm or less in length It is preferable that the cutting pieces forming the shape. This is because the cutting pieces can be easily processed (recovery or recycling of the cutting pieces), and the cutting pieces can be satisfactorily processed without causing trouble such as wound around the bite or damaging the cutting surface.

The 1st-8th copper alloy is specifically provided as the water contact tool used in the state which always or temporarily contacts with water. For example, nipples, hose nipples, sockets, elbows, cheeses, plugs, bushings, joints, joints, flanges, stop valves, strainers, sluice valves, gate valves, check valves, globe valves, Diaphragm valve, pinch valve, ball valve, needle valve, miniature valve, relief valve, plug cock, handle cock, gland cock, two way cock, three way cock, four way cock, gas cock, ball valve, safety valve, Relief valve, pressure reducing valve, solenoid valve, steam trap, water meter, flow meter, hydrant, sprayer, still water, swing cock, mixing, fountain, tap, faucet, Check valve, check valve, branch valve, flash valve, switching cock, shower, shower hook, plug, zarubo, sprinkling nozzle, sprinkler, water heater tube, heat exchanger tube, boiler tube, trap, hydrant valve, Sewers, impellers, impeller shafts or pump cases or such spheres It is provided as the material. Moreover, it is also provided as a friction engagement member which moves relative in the state which always or temporarily contacts with a mating member. For example, it is provided as a gear, a sliding bush, a cylinder, a piston shoe, a bearing, a bearing part, a bearing member, a shaft, a roller, a rotary joint part, a bolt, a nut or a screw shaft, or such a component. Or as a pressure sensor, a temperature sensor, a connector, a compressor part, a carburetor part, a cable fixing bracket, a mobile phone antenna part or a terminal.

In addition, the present invention, in the case of producing the first to eighth copper alloys described above, in the casting step, Zr (containing for the purpose of further miniaturization of the crystal grains and stable crystal grains), It has excellent machinability, strength, abrasion resistance and corrosion resistance, so that Zr is not added in the form of oxides and / or sulfides during casting by adding it immediately before casting or in the final stage of raw material melting in the form of a copper alloy containing it. We propose a method for casting copper alloy castings. The copper alloy containing Zr further contains at least one element selected from P, Mg, Al, Sn, Mn and B based on a Cu—Zr alloy or a Cu—Zn—Zr alloy or such an alloy. It is very suitable.

That is, in the casting step of casting the first to eighth copper alloys or casting the constituent materials (plastic workpieces), Zr is formed into a granular material, a thin plate, a rod, or a linear shape. By adding it just before casting in the form of an intermediate alloy (copper alloy), the loss in addition of Zr is minimized as much as possible, and in the form of oxide or / sulfide in casting, Zr is added to exert crystallization effect of crystal grains. This is to prevent the occurrence of a situation in which it is necessary or sufficient to secure the amount of Zr. And when Zr is added just before casting, since Zr melting | fusing point is 800-1000 degreeC higher than melting | fusing point of the said copper alloy, a granular material (particle diameter: about 2-50 mm), a thin plate shape (thickness: about 1-10 mm) ), A rod-like material (diameter: about 2 to 50 mm) or a linear alloy, and a low-melting alloy material (for example, 0.5 to 65 mass%) that is close to the melting point of the copper alloy and contains many necessary components. One or more elements selected from P, Mg, Al, Sn, Mn and B based on a Cu-Zr alloy or a Cu-Zn-Zr alloy containing Zr or an alloy thereof (content of each element: 0.1 to 5 mass It is preferable to use in the form of alloy) containing%). In particular, Cu-Zn-Zr alloys containing 0.5 to 35 mass% Zr and 15 to 50 mass% Zn (preferably 1) are used to lower melting point to facilitate dissolution and prevent loss due to oxidation of Zr. It is preferable to use in the form of an alloy based on a Cu-Zn-Zr alloy) containing -15 mass% Zr and 25-45 mass% Zn. Zr is an element that inhibits the electrical and thermal conductivity, which is an essential property of copper alloys, depending on the compounding ratio with P co-added thereto, but the amount of Zr that does not form as an oxide or a sulfide is 0.04 mass% or less, particularly If it is 0.019 mass% or less, the electrical and thermal conductivity will hardly be reduced by addition of Zr, for example, even if electrical and thermal conductivity fall, the fall rate is very small compared with the case where not adding Zr.

Moreover, in order to obtain the 1st-8th copper alloy which satisfy | fills the conditions of (7), it is preferable to make casting conditions, especially casting temperature and cooling rate suitable. That is, it is preferable to determine about casting temperature so that it may become 20-250 degreeC high temperature (more preferably, 25-150 degreeC high temperature) with respect to the liquidus temperature of the said copper alloy. That is, the casting temperature is preferably determined in the range of (liquid line temperature + 20 ° C) ≤ casting temperature ≤ (liquid line temperature + 250 ° C), and (liquid line temperature + 25 ° C) ≤ casting temperature ≤ (liquid line temperature + 150 ° C). It is more preferable to determine in the range of. Generally depending on the alloy component, the casting temperature is 1150 ℃ or less, preferably 1100 ℃ or less, more preferably 1050 ℃ or less. The lower limit side of the casting temperature is not particularly limited as long as the molten metal is filled in every corner of the mold, but there is a tendency that the grains become finer when cast at lower temperatures. In addition, it should be understood that such temperature conditions depend on the amount of the alloy blended.

The copper alloy of the present invention can withstand the shrinkage during solidification because the crystal grains are miniaturized in the melt solidification step, and can reduce the occurrence of casting cracks. In addition, since holes and poresity generated during the solidification process are easy to fall out to the outside, the surface is smooth because there are no casting defects or the like (there are no casting defects such as many holes, and no dendrite network is formed). The shrinkage hole is as shallow as possible). A sound casting can be obtained. Therefore, according to this invention, the casting which is very practical, or the plastic processed material which plasticized this can be provided.

In addition, the crystals crystallized in the solidification process are not typical twig shapes specific to the casting structure, but branched branches, preferably circular, elliptical, polygonal or cross-shaped. For this reason, the fluidity | liquidity of a molten metal improves, and even in the case of a mold with a thin thickness and a complicated shape, a molten metal can be spread evenly to every corner.

The copper alloy of the present invention exhibits machinability, strength, and abrasion resistance exerted by the constituent elements by miniaturization of crystal grains and uniform dispersion of phases other than the α phase (κ phase and γ phase caused by Si) and Pb particles. Sliding resistance) and corrosion resistance can be greatly improved, and water contact brackets (for example, faucet fittings, valves, cocks, joints and plans for water supply pipes) which are used in constant or temporary contact with tap water and the like. Tributary, faucet brackets, casting equipment, drainage equipment, connecting brackets, water heater parts, etc., frictional engagement members (e.g., bearings, gears, Cylinders, bearing retainers, impellers, valves, on-off valves, pump parts, bearings, etc.), pressure sensors, temperature sensors, connectors, compressor parts, scroll compressor parts, high pressure valves, air conditioning valves Valve, carburetor parts, cable fixing bracket can be made very suitable for practical use as a mobile phone antenna parts, terminal, or the like such forming member.

In addition, according to the method of the present invention, the addition of Zr in the form of oxides and sulfides does not cause defects, and the crystal grains due to the coadding effect of Zr and P are realized to efficiently cast the above-mentioned copper alloy casting efficiently. can do.

FIG. 1A is a photograph of the etching surface (cutting surface) of the copper alloy No. 79 of the example, showing a macrostructure.

FIG. 1B is a photograph of the etching surface (cutting surface) of the copper alloy No. 79 of the example, showing the microstructure.

FIG. 2A is a photograph of the etching surface (cutting surface) of the copper alloy No. 228 of the comparative example, showing a macrostructure.

2B is a photograph of the etching surface (cutting surface) of the copper alloy No. 228 of the comparative example, which shows a microstructure.

3 is a photomicrograph of the semi-molten solidified state in the semi-molten castability test for the copper alloy No. 4 of the example.

4 is a photomicrograph of the semi-melting solidification state in the semi-molten castability test for the copper alloy No. 202 of the comparative example.

Fig. 5 is a perspective view showing the form of cut pieces generated in a cutting test.

6 is a perspective view showing castings C, D, C1, or D1 (water meter body).

FIG. 7: is a top view which cuts out and shows the bottom part of casting C, D, C1, or D1 (water meter main body) shown in FIG.

FIG. 8 is an enlarged plan view of the inner main part (the inner part corresponding to the M portion in FIG. 7) of the casting C which is the copper alloy No. 72 of the embodiment.

FIG. 9 is a sectional view of an essential part of casting C, which is a copper alloy No. 72 of the embodiment (corresponding to a sectional view taken along line N-N in FIG. 7).

FIG. 10 is an enlarged plan view of the inner main part (the inner part corresponding to the M portion in FIG. 7) of the casting C which is the copper alloy No. 73 of the embodiment.

FIG. 11 is a sectional view of an essential part of Casting C, which is the copper alloy No. 73 of the example (corresponds to the sectional view taken along line N-N in FIG. 7).

12 is an enlarged plan view of an inner main part (an inner part corresponding to an M part in FIG. 7) of the casting C1 that is a copper alloy No. 224 of a comparative example.

FIG. 13 is a sectional view of an essential part of the casting C1 of the copper alloy No. 224 of the comparative example (corresponding to a sectional view taken along line N-N in FIG. 7).

As an example, copper alloy Nos. 1 to No. 92 of the compositions shown in Tables 1 to 8 were obtained as castings A, B, C, D, E, F and plastic workpiece G. Moreover, as a comparative example, copper alloy No.201-No.236 of the composition shown in Table 9-Table 12 were obtained as casting A1, B1, C1, D1, E1, F1, G1, and the sintered workpiece G2.

Castings A (copper alloy Nos. 1 to 46) and A1 (copper alloy Nos. 201 to 214) are formed at a low speed (0.3) using a casting apparatus in which a horizontal continuous casting machine is installed in a melting furnace (solvent capacity: 60 kg). m / min), continuous rod of 40 mm diameter. In addition, castings B (copper alloy Nos. 47 to 52) and B1 (copper alloys No. 217 and No. 218) have a horizontal continuous casting machine in a melting furnace (solvent capacity: 60 kg) similarly to castings A and A1. Continuously cast at low speed (1m / min) using a casting device that is laid. It is a bar of 8 mm diameter. In any case, casting was performed continuously by adjusting and adding additional elements so as to be a predetermined component from time to time using a graphite mold. In addition, in the casting process of castings A, B, A1, and B1 described above, Zr is added in the form of a Cu-Zn-Zr alloy (including 3 mass% of Zr) at the time of casting, and the casting temperature is changed to It was set at 100 ° C. higher than the liquidus temperature of the constituent material. Casting A1 (copper alloy Nos. 215, No. 216) is a commercially available 40 mm diameter horizontal continuous rod (No. 215 corresponds to CAC406C).

Castings C (copper alloy Nos. 53 to No. 73), D (copper alloys No. 74 to No. 78), C1 (copper alloys No. 219 to No. 224 and D1 (copper alloys No. 225, No. 226) ) Are all obtained by low pressure casting (mold temperature: 1005 ° C ± 5 ° C, pressure: 390 mbar, pressurization time: 4.5 seconds, retention time: 8 seconds) of actual operation, as shown in FIG. It is an actual casting which has a water meter main body, and castings C and C1 are cast using a die, and castings D and D1 are cast using a sand mold.

Castings E (copper alloys No.79 to No.90) and E1 (copper alloys No.228 to No.233) are formed in a columnar shape obtained by melting the raw material in an electric furnace and casting the molten metal to an iron mold preheated to 200 ° C. It is an ingot (diameter: 40 mm, length: 280 mm).

Castings F (No. 91) and F1 (No. 234) are large castings (thickness: 190 mm, width 900 mm, length: 3500 mm ingots) obtained by low pressure casting in actual operation.

Plastic workpiece G (copper alloy No. 92) is a rod having a diameter of 100 mm obtained by hot extrusion of an ingot (240 mm diameter billet). In addition, the plastic workpiece G1 (copper alloy No. 235, No. 236) is a commercially available extrusion-drawing rod (40 mm diameter). No. 235 corresponds to JIS C3604, and No. 236 corresponds to JIS C3771. In addition, in the following description, the castings A, B, C, D, E, F and the plastic workpiece G are called "examples", and castings A1, B1, C1, D1, E1, F1, G1 and plastic workpiece G2 Is sometimes referred to as a 'comparative gift'.

Then, sample No. 10 specified in JIS Z 2201 was taken from Examples A, B, C, D, E, G and Comparative Examples A1, B1, C1, D1, E1, G1, G2, and the test piece was armed. Tensile tests with a slur universal testing machine were conducted to measure tensile strength (N / mm 2), 0.2% yield strength (N / mm 2), elongation (%), and fatigue strength (N / mm 2). The results are as shown in Tables 13 to 18, and the examples were confirmed to be excellent in mechanical properties such as tensile strength. In addition, about casting C, D, C1, and D1, the test piece was extract | collected from the runner part K shown in FIG.

Moreover, in order to compare and confirm the machinability of an Example and a comparative example, the following cutting test was done and the cutting main component force N was measured.

That is, the outer circumferential surfaces of samples taken from Examples A, B, E, G and Comparative Examples A1, B1, E1, and G1 were point straight tools (incline angle: -6 °, nose R: 0.4 mm). The cutting speed: 80 m / min, depth of cut: 1.5 mm, feed: 0.11 mm / re., And cutting speed: 160 m / min, depth of cut: 1.5 mm, feed: 0.11 mm / re. Cutting was carried out dry under the conditions of, and measured with a three-component dynamometer attached to the bite, and converted into cutting principal components. The results were as shown in Tables 13-18.

In addition, the state of the cutting piece produced | generated in the said cutting test was observed, and according to the shape, the shape of (a) trapezoid or triangle shape (FIG. 5A), (b) tape shape of length 25mm or less (FIG. 5B) ), (c) needle shape (Fig. 5c), (d) tape shape of length 75 mm or less (except (b)) (Fig. 5d), (e) spiral shape of less than three rotations (Fig. 5e), (f) The machinability was determined by classifying into seven of tape shapes (FIG. 5F) exceeding 75 mm and spiral shapes (FIG. 5G) exceeding three rotations (g), and the results were shown in Tables 13 to 18. In this table, the cutting piece shape is (a) for "◎", (b) for "o", (c) for "o", (d) for "o", ( e) was shown as "Δ", (f) was shown as "x", and (g) was shown as "xx", respectively. When the cutting pieces are in the form of (f) and (g), not only the cutting pieces are processed (recovery or recycling of the cutting pieces), but also the cutting pieces are wound on the bite or the cutting surface is cut. Trouble such as damage occurs and good cutting cannot be performed. In the case where the cutting pieces are in the form of (d) and (e), large troubles such as (f) and (g) do not occur, but the cutting pieces are not easily processed, and the continuous cutting process is performed. In some cases, it may be wound around the bite or damage to the cutting surface. However, in the case where the cut pieces are in the form of (a) to (c), the above trouble does not occur and the volume of the cut pieces is not large as in (f) and (g). However, with regard to (c), depending on the cutting conditions, it may infiltrate into the sliding surface of a machine tool such as a lathe, resulting in mechanical obstacles, risks of getting stuck in the fingers or eyes of an operator. Therefore, in determining machinability, (a) is the best, (b) is next, (c) is good, (d) is slightly good, (e) is an acceptable limit, and (f) Is inappropriate, and (g) is the most inappropriate. It was confirmed from the cutting main component force and the cutting piece form that the examples were excellent in machinability.

In addition, the following wear test was carried out to compare the examples and the wear resistance.

First, ring-shaped test pieces having an outer diameter of 32 mm and a thickness (axial length) of 10 mm were obtained from Examples A, E, and Comparative Examples A1, E1, and G1 by performing cutting and drilling thereon. Next, while fitting the test piece to the rotating shaft and rolling the SUS304 roll (outer diameter 48 mm) on the outer circumferential surface of the ring-shaped test piece with a load of 50 kg, the oil was dripped onto the outer circumferential surface of the test piece. The axis of rotation was rotated to 209r.pm. And when the rotation speed of the test piece reached 100,000 times, rotation of the test piece was stopped and the weight difference, ie, abrasion loss (mg), before and after rotation of the test piece was measured. The smaller the wear loss, the better the wear resistance of the copper alloy. The results are as shown in Tables 19, 20, and 22 to 24, and it was confirmed that the examples were excellent in wear resistance and sliding resistance.

In order to compare and confirm the corrosion resistance of the examples and the comparative examples, the following dezincification corrosion test specified in the following erosion corrosion tests I to III and 'ISO 6509' and stress corrosion cracking test specified in the JIS H3250 were conducted. .

That is, in the erosion corrosion tests I to III, samples taken from Example A, C, D, and E and Comparative Examples A1, E1, and G1 castings, from nozzles having a diameter of 1.9 mm in a direction orthogonal to the axis. The test solution (30 ° C.) was collided at a flow rate of 11 m / sec, an erosion corrosion test was performed, and the loss of corrosion (mg / cm 2) after a predetermined time T had elapsed. As a test solution, in test I, 3% saline solution, in test II, a mixed saline solution mixed with CuCl ₂ · 2H ₂ O (0.13 g / L) and 3% saline solution, and in test III, a trace amount of sodium hypochlorite solution (NaClO) was used. The mixed solution which added hydrochloric acid (HCl) was used, respectively. The corrosion loss was the vehicle (mg / cm <2>) per cm <2> with the sample weight after colliding a test liquid for T hours from the weight of a sample before starting a test, and the collision time set T = 96 hours for all the tests I-III. The results of the erosion corrosion tests I to III were as shown in Tables 19 to 24.

In addition, in the de-zinc corrosion test of ISO 6509, samples taken from Examples A, C, D, E and Comparative Examples A1, E1, and G1 castings were exposed so that the exposed sample surface was perpendicular to the stretch direction. After attaching to phenol resin, the surface of the sample was polished up to 1200 times with emery paper, and then ultrasonically washed in pure water and dried. The skin test sample thus obtained was immersed in an aqueous solution of 1.0% cupric chloride dihydrate (CuCl ₂ · 2H ₂ O), preserved at 75 ° C. for 24 hours, and then taken out of the aqueous solution. The maximum value of the zinc corrosion depth, ie the maximum dezinc corrosion depth (μm), was measured. The result was as showing in Table 19-24.

Moreover, about the stress corrosion cracking test of "JIS H3250", V-shape (bending part R which forms 45 degrees of plate-shaped samples (width: 10 mm, length: 60 mm, thickness: 5 mm) taken from castings B and B1). (5 mm) was bent (addition of tensile residual stress), and degreasing and drying were performed, followed by 12.5% aqueous ammonia (ammonia diluted with an equal amount of pure water). 25 degreeC). And when the predetermined | prescribed maintenance time (exposure time) passed, the sample was taken out of the desiccator and wash | cleaned with 10% sulfuric acid, and the presence or absence of the crack of the said sample was observed and judged by the magnifying glass (10 times). The result was as showing in Table 21 and Table 23. In this table, cracks were not recognized when the preservation time in the ammonia atmosphere was 8 hours. However, when the clear cracks were recognized after 24 hours, they were cracked even after 24 hours. About this thing which was not recognized at all, it showed with "(circle)". From the results of these corrosion resistance tests, it was confirmed that the examples were excellent in corrosion resistance.

Moreover, in order to evaluate and compare the cold workability of an Example and a comparative example, the following cold compression tests were done.

In other words, a cylindrical sample having a diameter of 5 mm and a length of 7.5 mm is cut and collected from the castings A, B, and A1 by a lathe, and is compressed using an Amsler universal testing machine to determine the relationship with the compression ratio (processing rate). The cold compression workability was evaluated by the presence or absence of the crack. The results are as shown in Tables 19 to 21 and Table 23. In this table, the cracks formed at 30% compression rate are referred to as "x" due to the inferior cold compression workability, and the cracks do not occur at 40% compression rate. It was shown as "(circle)" that it was excellent in cold compression workability, and the crack which did not generate | occur | produce in 30% of the compression ratio was shown as "(triangle | delta)" as having having good cold workability as having the cracking at 40% of the working ratio. The part of this cold compression workability can be evaluated as the part of caulking workability, and if evaluation is "(circle)", the caulking process of high precision can be performed easily, and if it is "(triangle | delta), general caulking process is possible. If it is "x", it is impossible to perform an appropriate caulking process. Although some of the examples were "Δ", most were "(circle)" and it was confirmed that they were excellent in cold compression workability, ie, caulking workability.

Moreover, in order to compare and evaluate the hot forging property of an Example and a comparative example, the following high temperature compression test was done. That is, a cylindrical sample having a diameter of 15 mm and a height of 25 mm was taken from the castings A, E, E1 and the plastic workpiece G1 by using a lathe, and after holding the sample at 700 ° C. for 30 minutes, the processing rate was changed. Cold compression was performed and hot forging was evaluated from the relationship between the work rate and the crack. The result was as Table 20, Table 22, and Table 24, and it confirmed that the Example was excellent in hot forging property. In this table, the cracks did not occur at 80% of the working rate, which is excellent in hot forging, and is indicated by "○". Some cracks occurred at the processing rate of 80%, but the cracking occurred at the processing rate of 65%. The thing which did not generate | occur | produce was shown as "(triangle | delta)" as having a good hot forging property, and the thing which remarkable crack generate | occur | produced at 65% of the working rate was shown as "x" as the inferior hot forging property.

In addition, in order to compare and confirm the freshness with respect to an Example and a comparative example, freshness was determined on the following reference | standard. In other words, the rod-shaped castings B and B1 (diameter: 8 mm) were wired, and the wire was fresh without cracking by one wire wire (processing rate: 36%) up to a diameter of 6.4 mm. It is judged to be excellent, and diameter: It is judged that it was general freshness to be able to be fresh without cracking by one draw processing (processing rate: 23.4%) to 7.0mm, and to diameter: 7.0mm by one drawing processing It was judged that the freshness was inferior about the thing which a crack generate | occur | produced when it was fresh. The results are as shown in Table 21 and Table 23, and those judged to have excellent freshness were "○", those judged to have general freshness as "Δ", and those judged to have low freshness "×". Represented. As understood from Table 21 and Table 23, it was confirmed that the Example was superior in freshness to the Comparative Example.

Moreover, castability was determined about the Example object and the comparative example.

First, the superiority of the main composition was determined by performing the following casting test for castings B and B1. That is, in the castability determination test, the same apparatus as in the case of obtaining the casting B in the example (or the casting B1 in the comparative example) while varying the casting speed over two high and low stages of 2 m / min and 1 m / min. Using the same conditions, continuous casting of a wire rod (rod) having a diameter of 8 mm was performed, and the superiority of castability was determined by the height of the casting speed at which the wire rod without defects was obtained. The result is as shown in Table 21 and Table 23, and it shows as "(circle)" as what has a defect free wire rod obtained by the high speed casting of 2m / min, and shows it as "(circle)", and can obtain a wire rod without a defect by high speed casting. Although it could not be obtained, the thing obtained by the low speed casting of 1 m / min is shown to have general casting property, and is represented by "(triangle | delta)", and the casting property that the casting wire B-1 without defect was not obtained even by the low speed casting (1 m / min) was castability It was shown as "x" as falling.

Second, the bottom part L (refer FIG. 6) of the castings C and C1 is cut out, and the inner part M (refer FIG. 7) in the inner surface of the cut-out part is cast and it casts by the presence or absence of a defect and the depth inside. Rated it. The results were as shown in Tables 21-23. In this table, what was excellent in castability was shown about the thing which does not have a defect in the inner part M and is shallow in the eye, and was represented by "(circle)". In addition, in the case where there is no clear defect in the inner portion M and the depth is not too deep, the castability is regarded as good and is represented by "Δ", and in the case where there is a clear defect in the inner portion M or deep inside, It was shown as "x" as castability was inferior. An example of the eye portion M is shown in FIGS. 8 to 13. That is, FIG. 8 is sectional drawing of the eye part M in the copper alloy No. 72 of an Example, and FIG. 9 is an enlarged plan view of the eye part M. FIG. 10 is a sectional view of the inner portion M in the copper alloy No. 73 of the embodiment, and FIG. 11 is an enlarged plan view of the inner portion M. FIG. 12 is a cross-sectional view of an inner portion M of the copper alloy No. 224 of the comparative example, and FIG. 13 is an enlarged plan view of the inner portion M. FIG. As apparent from Figs. 8 to 13, the surface of the inner portion M is very smooth and free from defects in the copper alloys No. 72 and 73, but the defect apparent in the inner portion M in the copper alloy No. 224. This exists and deep inside. Further, since copper alloy No. 224 has almost the same composition as copper alloys No. 72 and 73 except that it does not contain Zr, the crystal grains formed by the co-addition of Zr and P are also shown in Figs. It is understood that miniaturization is achieved, and as a result, the castability is improved.

Third, the following anti-melting test was carried out in order to evaluate the semi-melt castability of the Examples and Comparative Examples.

That is, the raw materials used to cast the castings A, A1, and E1 were placed in a crucible, heated up to a semi-melt state (solid state: about 60%), and maintained at that temperature for 5 minutes, followed by quenching (water cooling). And the shape of the solid phase in the semi-melt state was investigated, and the semi-melt castability was evaluated. The results were as shown in Table 19, Table 23, and Table 24, and it confirmed that the Example material satisfy | filled the conditions of (14) and (15) and was excellent in anti-melt casting property. In this table, the average grain size of the solid phase is 150 µm or less, or the average of the maximum length of the crystal grains is 300 µm or less. Is not satisfied, but it is evaluated as having a good anti-melt castability enough to be industrially satisfied that no significant dendrite network is formed, and is represented by "Δ", and that the dendrite network is formed. It evaluated that castability was inferior and showed as "x". An example in the case where an example material satisfies the conditions of (14) and (15) is shown. That is, FIG. 3 is a micrograph of the semi-melt solidification state in the semi-molten casting test with respect to Example No. 4, and clearly satisfies the conditions (14) and (15). 4 is a photomicrograph of the semi-melt solidification state in the semi-molten casting test with respect to comparative example No. 202, and does not satisfy the conditions of (14) and (15).

Moreover, about Example A-G and Comparative Examples A1-G1, the average crystal grain size (micrometer) in the case of the said solidification was measured. That is, the Example and Comparative Example were cut | disconnected, the cut surface was etched with nitric acid, and the average diameter (average grain size) of the crystal grain in the macrostructure which appears on the etching surface was measured. Moreover, about castings C, D, C1, and D1, after cutting the inflow-outlet part J (refer FIG. 6) of the water meter main body, and etching the cut surface with nitric acid, the average diameter of the crystal grain in the etching surface Was measured in the same manner as above. This measurement was performed based on the comparative method of the new product crystal grain size test of JIS H0501. After etching the cut surface with nitric acid, the grain size exceeding 0.5 mm was observed visually. It was magnified 7.5 times, and about smaller than about 0.1 mm was etched with the liquid mixture of hydrogen peroxide and ammonia water, and then magnified 75 times with the optical microscope. The result was as showing in Tables 13-18, and all the examples satisfy | filled the conditions of (7). Moreover, about the Example, it was also confirmed that the crystal | crystallization at the time of melt solidification is alpha phase.

Moreover, about Example, it was also confirmed that the conditions of (12) and (13) are satisfied. One example is shown in FIG. 1 and FIG. 2. 1 is a macrostructure photograph (FIG. 1A) and a microstructure photograph (FIG. 1B) of Example No. 79, and FIG. 2 is a macrostructure photograph of Comparative Example No. 228. FIG. As apparent from Fig. 1 and Fig. 2, Comparative Example No. 228 does not satisfy the conditions of (12) and (13), but Example No. 79 satisfies the conditions of (12) and (13). It is understood.

As mentioned above, an Example material contains each member element in the above-mentioned range, These conditions are satisfied by satisfy | filling the conditions (1)-(7) (the conditions of (8) about 5th-8th copper alloys)). Machinability, mechanical properties (strength, elongation, etc.), abrasion resistance, castability, anti-melt casting, cold compression workability, hot forging and corrosion resistance are significantly improved compared to comparative examples that do not satisfy at least a part of It became. In addition, the improvement of such a characteristic can be achieved more effectively by satisfying the conditions (10) to (15) (the conditions of (9) and (16) for the fifth to eighth copper alloys) in addition to the above conditions. It was confirmed that it could. This also applies to the large casting F (No. 91), and it was confirmed that the effect of refining the grains and improving the characteristics thereof by co-addition of Zr and P are intact. Also, except for the fact that Zr is not contained, the large castings (No. 234) having almost the same composition as the copper alloy No. 91 have no such effect, and the difference from the small castings is obvious.

Also, castings C, C1, and D1 containing Pb were subjected to dissolution test of Pb based on the JIS S3200-7: 2004 Water Supply Instrument Leaching Performance Test Method. That is, in this test, the pH of the sodium hypochlorite solution, the sodium bicarbonate solution and the calcium chloride solution was added to the water in which pH was adjusted with sodium hydroxide solution (water quality: pH 7.0 ± 0.1, hardness: 45 ± 5 mg / L, Alkaline degree: 35 ± 5 mg / L, residual chlorine: 0.3 ± 0.1 mg / L), and the castings C, C1 and D1 were subjected to predetermined cleaning treatment and conditioning, and then the castings C, C1 and D1 The hollow part, that is, the water meter body (see Fig. 6) is filled with a leach solution at 23 ° C., sealed, and the liquid temperature is maintained for 16 hours, and then the leach solution from the water meter is collected. The amount of Pb contained, that is, the amount of Pb eluted (mg / L) is measured. The results are as shown in Table 21, Table 23, and Table 24, and it was confirmed that the amount of Pb elution was very small in the Example, and it can be used as a water contacting tool such as a water meter without problems.

Moreover, the water-flow part K (refer FIG. 6) was extract | collected from the casting C of copper alloy No. 54, and it casted the copper alloy as a raw material (Zr: 0.0063 mass%). That is, after dissolving the turbidity part K at 970 ° C. under charcoal coating and preserving for 5 minutes, the oxidation loss of Zr at the time of dissolution is estimated to be 0.001 mass%, and the amount suitable for the amount of Zr and Zr is 3 mass. Cu-Zn-Zr alloy containing% was added and cast in the metal mold | die. In the resultant cast product, the Zr content was almost the same as that of the copper alloy No. 54 (0.0061 mass%), and the average grain size was measured. The average grain size was 25 μm. From this, it was confirmed that the copper alloy of the present invention can be effectively used as a recycled raw material without causing any excess or unnecessary portions such as the water-producing portion K, which occurs in the casting, without damaging the effect of miniaturization of crystal grains. Therefore, surplus or unnecessary parts, such as the water-treatment part K, can be used as a supplementary raw material input under continuous operation, and continuous operation can be performed very efficiently and economically.

Specifically, the copper alloy of the present invention can be suitably used for the following applications.

1. General mechanical parts requiring castability, conductivity, thermal conductivity, and high mechanical properties

2. Electrical components requiring high conductivity and thermal conductivity, electrical parts requiring connectors, soldering, welding which can facilitate welding

3. Instrument parts requiring excellent castability

4. Water supply and drainage brackets, construction brackets, daily necessities and general merchandise requiring excellent mechanical properties.

5. Ship propellers, shafts, bearings, valve seats, valve rods, clamping brackets, clamps, connecting brackets, door handles, pipe buckles, cams that are required to have high strength, high hardness and excellent corrosion resistance and toughness.

6. Valves, stems, bushes, worm gears, arms, cylinder parts, valve seats, bearings for stainless steel shafts, pump impellers requiring high strength, hardness and wear resistance

7. Valves, pump bodies, paddle wheels, hydrants, mixed faucets, water valves, joints, sprinklers, cocks, water meters, water stops, sensor parts, scrolls requiring pressure resistance, wear resistance, machinability Type compressor parts, high pressure valve, sleeve pressure vessel

8. Sliding parts, hydraulic cylinders, cylinders, cog wheels, fishing reels, fasteners for aircraft requiring excellent hardness and wear resistance

9. Connectors for bolts, nuts, and piping requiring excellent strength, corrosion resistance, and wear resistance

10. Chemical mechanical parts and industrial valves that are suitable for large castings of simple shapes and require high strength, corrosion resistance and abrasion resistance.

11.Welding pipe, water pipe, heat exchanger pipe, heat exchanger pipe plate, gas pipe pipe, elbow, marine structural material, welding member, welding material such as desalination device requiring joint strength, growth, lining, overlay, corrosion resistance, and castability.

12. Water contact brackets (couplings, flanges)

Nipple, Hose Nipple, Socket, Elbow, Cheese, Plug, Bushing, Joint, Joint, Flange

13. Water contact bracket (valve, cock)

Stop Valve, Strainer, Slew Valve, Gate Valve, Check Valve, Globe Valve, Diaphragm Valve, Pinch Valve, Ball Valve, Needle Valve, Miniature Valve, Relief Valve, Plug Cock, Handle Cock, Gland Cock, Two Way Cock , 3-way cock, 4-way cock, gas cock, ball valve, safety valve, relief valve, pressure reducing valve, solenoid valve, steam trap, water pump (water meter, flow meter)

14. Water Contact Brackets

Faucets (water taps, water taps, water taps, rotary cocks, mixing taps, fountain taps), faucets, basin taps, check valves, basin valves, flash valves, switching cocks, showers, shower hooks, plugs, jarbos, spray nozzles, Sprinkler

15. Water contact bracket (casting equipment, drainage equipment)

Traps, Hydrant Valves, Sewers

16. Pumps

Impeller, Case, Connecting Bracket, Sliding Bush

17. Car related equipment

Valves, couplings, pressure switches and sensors, temperature sensors (thermostats), connectors, bearing and bearing parts, compressor parts, carburetor parts, cable fixing brackets

18. Home Appliance Parts

Mobile phone antenna parts, terminals / connectors, lead screws, motor bearings (fluid bearings), copier shaft rollers, valve coupling nuts for air conditioners, sensor parts

19. Friction engagement member

Piston shoes of hydraulic and pneumatic cylinders, bush sliding parts, wire fixing brackets, high pressure valve couplings, gears, gear shafts, bearing parts, pump bearings, valve shoes, cap nuts, header feeders

Claims (46)

Cu: 69 to 88 mass%, Si: 2 to 5 mass%, Zr: 0.0005 to 0.04 mass%, P: 0.01 to 0.25 mass%, and Zn: balance, About content [a] mass% of element a, f0 = [Cu] -3.5 [Si] -3 [P] = 61-71, f1 = [P] / [Zr] = 0.7-200, f2 = [Si ] / [Zr] = 75-5000 and f3 = [Si] / [P] = 12-240, f4 = [α] + [γ with respect to the content [b]% of phase b in the area ratio, which contains α phase and κ phase or α phase and γ phase, or α phase and κ phase and γ phase ] + [κ] ≥85 and f5 = [γ] + [κ] +0.3 [μ]-[β] = 5-95 ([b] = 0 for phase b not contained) Metal texture, A copper alloy, wherein the average grain size in the macrostructure during melt solidification is 200 µm or less. The method of claim 1, It further contains at least one element selected from Pb: 0.005 to 0.45 mass%, Bi: 0.005 to 0.45 mass%, Se: 0.03 to 0.45 mass%, and Te: 0.01 to 0.45 mass%, For content [a] mass% of element a, f0 = [Cu] -3.5 [Si] -3 [P] +0.5 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) = 61-71 and f6 = [Cu] -3.5 [Si] -3 [P] +3 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) ^1/2 ≥62 and f7 = [Cu] -3.5 [Si] -3 [P] -3 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) ^{1 /} A copper alloy having a relationship of ² ≦ 68.5 ([a] = 0 for element a not containing). The method of claim 1, It further contains at least one element selected from Sn: 0.05 to 1.5mass%, As: 0.02 to 0.25 mass% and Sb: 0.02 to 0.25 mass%, About content [a] mass% of element a, f0 = [Cu] -3.5 [Si] -3 [P] -0.5 ([Sn] + [As] + [Sb]) = 61-71 (not containing A copper alloy having a relationship of [a] = 0 for element a). The method of claim 2, It further contains at least one element selected from Sn: 0.05 to 1.5mass%, As: 0.02 to 0.25 mass% and Sb: 0.02 to 0.25 mass%, For content [a] mass% of element a, f0 = [Cu] -3.5 [Si] -3 [P] +0.5 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) -0.5 ([Sn] + [As] + [Sb]) = 61 to 71 (for element a not containing, [a] = 0). A copper alloy characterized by the above-mentioned. The method of claim 1, It further contains at least one element selected from Al: 0.02 to 1.5mass%, Mn: 0.2 to 4mass% and Mg: 0.001 to 0.2mass%, For content [a] mass% of element a, f0 = [Cu] -3.5 [Si] -3 [P] +0.5 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) -0.5 ([Sn] + [As] + [Sb]) -1.8 [Al] + 2 [Mn] + [Mg] = 61 to 71 ([a] = 0 for elements a not contained) Copper alloy characterized by having a relationship. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete The method of claim 2, It further contains at least one element selected from Al: 0.02 to 1.5mass%, Mn: 0.2 to 4mass% and Mg: 0.001 to 0.2mass%, For content [a] mass% of element a, f0 = [Cu] -3.5 [Si] -3 [P] +0.5 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) -0.5 ([Sn] + [As] + [Sb]) -1.8 [Al] + 2 [Mn] + [Mg] = 61 to 71 ([a] = 0 for elements a not contained) Copper alloy characterized by having a relationship. delete The method of claim 4, wherein It further contains at least one element selected from Al: 0.02 to 1.5mass%, Mn: 0.2 to 4mass% and Mg: 0.001 to 0.2mass%, For content [a] mass% of element a, f0 = [Cu] -3.5 [Si] -3 [P] +0.5 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) -0.5 ([Sn] + [As] + [Sb]) -1.8 [Al] + 2 [Mn] + [Mg] = 61 to 71 ([a] = 0 for elements a not contained) Copper alloy characterized by having a relationship. The method according to any one of claims 2, 4, 5, 28 and 30, Between the content [a] mass% of the element a and the content [b]% of the phase b in the area ratio, f8 = [γ] + [κ] +0.3 [μ] − [β] +25 ([Pb] +0.8 ([Bi] + [Se]) + 0.6 [Te]) ^1/2 ≧ 10 and f9 = [γ] + [κ] +0.3 [μ] − [β] -25 ([Pb] +0.8 ( [Bi] + [Se]) + 0.6 [Te]) ^1/2 ≤ 70 ([a] = [b] = 0 for elements a and b not containing) Copper alloy. The method according to any one of claims 1 to 5 and 28 and 30, In the case where at least one of Fe and Ni is contained as an unavoidable impurity, the content of Fe or Ni is 0.3 mass% or less when any one of them is contained, and the total content thereof when Fe and Ni is contained Copper alloy, characterized in that less than 0.35mass%. delete delete delete The method according to any one of claims 1 to 5 and 28 and 30, A copper alloy, which is a cast product obtained in a casting step or a plastic processed product in which at least one plastic working is performed. As the plastic workpiece of claim 36, the cutting speed is 80 to 160 m / min, the cutting depth is 1.5 mm, and the feed speed is 0.11 mm by a lathe using a bite having an inclination angle of -6 ° and a nose radius of 0.4 mm. A copper alloy produced when cutting under the condition of / rev., wherein the resulting cutting piece is a trapezoidal or triangular small piece, a tape of 25 mm or less in length, or a needle shaped cutting. The casting according to claim 36, which is a wire rod, a rod, or a hollow rod cast by a horizontal continuous casting method, an upward method, or an upcast method. A copper alloy as set forth in claim 36, which is a hot extrusion workpiece, a hot forging workpiece, or a hot rolling workpiece. A copper alloy, which is a wire rod, a rod, or a hollow rod formed by drawing or drawing a casting according to claim 38. The cast product according to claim 36, wherein in the semi-molten state having a solid phase ratio of 30 to 80%, at least a dendrite network forms a crystal structure, and the solid two-dimensional form is circular, non-circular near circular. Copper alloy, characterized in that it is an elliptical, cross-shaped or polygonal casting, semi-molten casting, semi-molten molding, molten forging or die-cast molding. The method of claim 36, A copper alloy, which is a water contact bracket used in a state of constant or temporary contact with water. The method of claim 42, wherein Nipple, hose nipple, socket, elbow, cheese, plug, bushing, pipe, joint, flange, stop valve, strainer, slew valve, gate valve, check valve, globe valve, diaphragm valve, pinch valve, ball valve, Needle Valve, Miniature Valve, Relief Valve, Plug Cock, Handle Cock, Gland Cock, Two Way Cock, Three Way Cock, Four Way Cock, Gas Cock, Ball Valve, Safety Valve, Relief Valve, Pressure Reducing Valve, Electronic Valves, steam traps, water meters, flowmeters, water hydrants, sprayers, water taps, rotary cocks, mixing taps, fountain taps, faucets, basin taps, check valves, basin valves, flash valves, switching cocks, showers, shower hooks, plugs , Cubo, sprinkling nozzle, sprinkler, heat pipe for hot water heater, heat pipe for heat exchanger, heat pipe for boiler, trap, fire hydrant valve, water inlet, impeller, impeller shaft or pump case or copper alloy, characterized in that these components. The method of claim 36, Copper alloy, characterized in that the frictional engagement member to move relative to the mating member in a constant or temporary contact state. The method of claim 44, Gears, sliding bushes, cylinders, piston shoes, bearings, bearing parts, valves, on-off valves, bearing elements, shafts, rollers, rotary joint parts, bolts, nuts or screw shafts, or copper alloys characterized by these components. The method of claim 36, A copper alloy characterized by a pressure sensor, a temperature sensor, a connector, a compressor part, a scroll compressor part, a high pressure valve, an air conditioning valve / opening valve, a carburettor part, a cable fixing bracket, a mobile phone antenna part or a terminal.

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