KR20150146347A

KR20150146347A - Low-lead brass alloy

Info

Publication number: KR20150146347A
Application number: KR1020140101091A
Authority: KR
Inventors: 지아드 리
Original assignee: 찌앙시 아우디 브래스워크 아이앤씨
Priority date: 2014-06-23
Filing date: 2014-08-06
Publication date: 2015-12-31
Also published as: PT2963134T; JP2016008354A; PL2963134T3; TW201600618A; AU2014204430B1; DK2963134T3; EP2963134A1; EP2963134B1; JP6069752B2; US20150368758A1; CN104032176A; CN104032176B; ES2680343T3; TWI577811B

Abstract

The present invention relates to a kind of a low lead brass alloy. The present invention, by weight of the overall brass alloy, comprises 62.5-63% of copper, 0.16-0.24% of lead, 0-0.02% of antimony, 0-0.1% of magnesium, 0-0.2% of tin, 0.0005-0.0009% of boron, 0.55-0.7% of aluminum, 0.05-0.15% of iron, 0-0.15% of nickel, 0.09-0.12% of arsenic, 0-0.005% of zirconium, and 0-0.01% of impurities and the remaining zinc.

Description

Low lead brass alloy {LOW-LEAD BRASS ALLOY}

The present invention relates to a low-lead brass alloy.

Copper has good conductivity and environmental friendliness. Germs that are harmful to human body can not survive on its surface. To improve the performance of copper, other elements are added to copper. For example, lead is added to copper brass This greatly improves the cutting performance of the brass, but the lead has a destructive effect on human health and ecological balance, and trends within the global scope are placing increasingly more restrictions on the use of lead-containing alloys.

In addition, as environmental problems become more prominent, the use environment becomes worse, the surface strength of brass products is lowered, or even brass pipes are drilled, and the service life of brass products is greatly shortened, causing problems in use.

In order to solve the above problem, there is a need to provide an alloy compounding method which substitutes a kind of high-grade lead brass, prevents de-zinc corrosion, and considers casting performance, monotonousness, cutting property, corrosion resistance and mechanical properties at the same time.

Therefore, the object of the present invention is to provide a brass alloy which is excellent as a kind of tensile strength, elongation and dezincing resistance, and which has excellent performance such as cutting performance, and which is suitable as a machined product requiring high strength, abrasion resistance and corrosion resistance. It safely replaces alloy copper containing a large amount of lead, and also fully meets the demand for restrictions on lead products for human society development.

In order to achieve the above object, the following low-lead brass alloy is provided.

(Hereinafter abbreviated as Inventive 1), it includes 62.5-63wt% of copper, 0.16-0.24wt% of lead, 0.55-0.7wt% of aluminum, and the balance zinc as the total weight of the brass alloy do.

In Inventive Example 1, the lead content was reduced to 0.24 wt% or less, the copper content was controlled to 62.5-63 wt%, and the amount of aluminum was increased to improve the machinability of the brass alloy. Therefore, aluminum has an ionization tendency greater than that of zinc on the surface of the alloy, so that it can preferentially bond with oxygen in the corrosive gas or solution to form a dense aluminum oxide protective film on the surface of the alloy, so that the brass alloy has corrosion resistance and anti- . In addition, aluminum can improve the mobility of alloy casting, thereby remarkably enhancing both the strength and hardness of the alloy and controlling the content of aluminum to 0.55-0.7 wt% of the total weight of the brass alloy in order to exert the above action.

Preferably, in Inventive Item 1, at least one element selected from antimony of 0-0.02 wt% of the total weight of the brass alloy, 0-0.2 wt% of tin, 0-0.01 wt% of magnesium and 0.09-0.12 wt% of arsenic And the selected elements all improve the cutting performance of the brass alloy to a certain extent. Moreover, the addition of antimony and tin can remarkably increase the strength of the alloy, improve the firing and enhance the corrosion resistance. A trace amount of arsenic can improve the anti-zinc properties of the alloy, but its content should not be too high, and a high content of arsenic will lower the hot forging and extrudability of the alloy.

More preferably, at least one selected from the group consisting of 0.0005-0.0009 wt% boron, 0.05-0.15 wt% iron, 0-0.15 wt% nickel, and 0-0.005 wt% zirconium in the total weight of the brass alloy Boron improves the corrosion resistance of brass alloys, suppresses dezincification, iron strengthens the toughness of brass alloys, and nickel not only prevents rusting of brass alloys but also forms compounds between alloys metals The abrasion resistance and the strength of the alloy were improved by uniformly depositing in the matrix, and the zirconium grain was refined to improve the casting of the brass alloy.

(Hereinafter abbreviated as Inventive 2), copper, 0.16-0.24 wt% of copper, 0.55-0.7 wt% of the total weight of the copper alloy, aluminum , 0-0.02 wt% of antimony, 0-0.2 wt% of tin, 0-0.01 wt% of magnesium, and the balance of zinc. The reason for adding aluminum, antimony, tin and magnesium among them is as described in the invention 1, and the addition is determined according to the demand when it is added specifically.

Preferably, Inventive Item 2 contains 0.09-0.12 wt% of arsenic, 0.0005-0.0009 wt% boron, 0.05-0.15 wt% iron, 0-0.15 wt% nickel, and 0-0.005 wt% of the total weight of the brass alloy Zirconium. &Lt; / RTI > The reason for the addition of arsenic, boron, iron, nickel and zirconium is as described in Inventive Example 1, and the addition is determined according to the demand.

In the low lead brass alloy (abbreviated as Inventive 3 hereinafter), 62.5-63wt% copper, 0.16-0.24wt% lead, 0-0.02wt% antimony, 0-0.01wt% of the total weight of the brass alloy, Magnesium, 0-0.2wt% tin, 0.0005-0.0009wt% boron, 0.55-0.7wt% aluminum, 0.05-0.15wt% iron, 0-0.15wt% nickel, 0.09-0.12wt% arsenic 0-0.005 wt% zirconium, 0-0.01 wt% impurities, and balance zinc. The reason for adding antimony, magnesium, tin, boron, aluminum, iron, nickel, arsenic and zirconium is as described in Inventive Example 1, and the simultaneous addition of the elements in Inventive Item 3 is a demand for performance of a specific product So that they can be better satisfied.

In order to more clearly illustrate the technique of the present invention, the technique of the present invention will be described by way of examples.

The scope of the present invention is not limited to the above-described exemplary embodiments. Variations and further modifications of the features of the invention described herein (which may be conceived by those skilled in the art and those of ordinary skill in the art having the benefit of this disclosure) and other applications of the principles of the invention described herein are considered to be within the scope of the invention .

In the description of the numerical values of the present invention, the foregoing and the following are interpreted to include numerical values themselves.

In the present invention, the dezinc corrosion inhibition performance test was carried out according to the AS-2345-2006 standard in the form of a cast state, in which 12.8 g of cupric chloride was added to 1000C.C deionized water and the measurement was left for 24 hours therein, Were measured.

⊚ represents a dezincification depth less than 300 탆, ∘ represents a dezincification depth between 300 袖 m and 400 袖 m, and X represents a dezincification depth greater than 400 袖 m.

The cutting performance test referred to herein is conducted in the form of a casting condition, employing the same cutter, proceeding at the same feed rate as the same cutting rate, with a cutting speed of 25 m / min and a feed rate of 0.2 mm / The blade depth is 0.5mm, the test bar diameter is 20mm, and the relative cutting rate is obtained by measuring the cutting resistance based on the C36000 alloy material.

Relative cutting rate = C36000 Cutting resistance of alloy material / sample cutting resistance.

? Represents a relative cutting rate greater than 85%; and? Represents a relative cutting rate greater than 70%.

All of the tensile strength and elongation tests referred to herein were subjected to tensile tests at room temperature in the form of casting conditions. The elongation, that is, the percentage of the distribution of the total deformation L of the gauge length distance portion after the tensile insulation of the sample and the distance L of the length of the gauge length is? =? L / L 占 100%. The comparative sample is a lead-containing brass of the same specification of the same condition, namely C36000 alloy.

Tests on the performance of alloying elements eluting in water referred to in this specification were conducted according to GB / T5750-2006 "Living Water Standard Test Method" and GB5749-2006 "Living Water Sanitation Standards ".

The measurement for the C36000 alloy material component distribution is as follows and the unit is weight percent (wt%).

Material number copper
(Cu) zinc
(Zn) Bismuth
(Bi) antimony
(Sb) manganese
(Mn) aluminum
(Al) Remark
(Sn) lead
(Pb) iron
(Fe) C36000
Alloy material 60.53 36.26 0 0 0 0 0.12 2.97 0.12

[Example]

Table 2 shows the distribution of 15 low-lead brass alloys and the units in each group are percent by weight (wt%).

number copper
(Cu) zinc
(Zn) lead
(Pb) magnesium
(Mg) aluminum
(Al) antimony
(Sb) Remark
(Sn) boron
(B) iron
(Fe) nickel
(Ni) arsenic
(As) zirconium
(Zr) One 63,000 36.233 0.215 - 0.550 - - - - - - - 2 62.542 36.578 0.240 - 0.638 - - - - - - - 3 62.500 36.638 0.160 - 0.700 - - - - - - - 4 62.511 36.648 0.168 0.010 0.551 0.020 - - - - 0.090 - 5 62.780 36.136 0.179 0.009 0.589 - 0.200 - - - 0.105 - 6 62.993 35.967 0.200 - 0.688 - 0.150 - - - - - 7 62.567 36.541 0.161 - 0.560 - - 0.0005 0.050 - 0.120 - 8 62.874 36.123 0.187 0.007 0.653 - - - - 0.150 - 0.004 9 63,000 36.116 0.192 - 0.670 0.015 - - - - - 0.005 10 62.510 36.416 0.167 - 0.689 0.018 0.198 - - - - - 11 62.913 36.860 0.198 0.008 - 0.019 - - - - - - 12 62.780 36.250 0.201 0.009 0.580 - 0.178 - - - - - 13 62.500 36.541 0.200 - 0.663 0.017 - 0.0007 0.076 - - - 14 62.831 35.987 0.212 0.010 0.578 - 0.132 - - 0.132 0.112 0.004 15 62.670 35.845 0.198 0.008 0.674 0.017 0.188 0.0009 0.150 0.143 0.101 0.003

The alloys of each group were tested for cutting performance, dezincification resistance, tensile strength and elongation at room temperature in the form of a cast state. The comparative sample was a C36000 alloy.

The tensile strength, elongation, cutting performance and dezinc corrosion resistance test results are shown below.

number Tensile strength (N / mm ² ) Elongation (%) Dezinc layer Relative cutting rate One 298 10 ◎ ○ 2 301 10 ◎ ◎ 3 308 10 ◎ ◎ 4 305 11 ◎ ◎ 5 310 11 ◎ ◎ 6 315 12 ◎ ◎ 7 311 12 ◎ ◎ 8 317 12 ◎ ◎ 9 320 11 ◎ ◎ 10 310 11 ◎ ◎ 11 300 10 ◎ ◎ 12 307 11 ◎ ◎ 13 317 12 ◎ ◎ 14 335 13 ◎ ◎ 15 326 13 ◎ ◎ C36000 alloy 394 9 × ◎

The performance of the alloys in each of the above groups was tested in water. The experimental results are as follows (each numerical value is in mg / L):

number copper
(Cu) zinc
(Zn) lead
(Pb) aluminum
(Al) antimony
(Sb) boron
(B) iron
(Fe) nickel
(Ni) arsenic
(As) One &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 2 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 3 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 4 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 5 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 6 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 7 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 8 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 9 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 10 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 11 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 12 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 13 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 14 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01 15 &Lt; 1.0 &Lt; 1.0 <0.01 <0.2 <0.005 <0.5 <0.3 &Lt; 0.02 <0.01

Although the present invention has been disclosed in the foregoing description, it is to be understood that the scope of the present invention is not limited to the above-described embodiments and various changes and modifications may be made within the spirit and scope of the present invention. .

Claims

Brass Alloy A low lead brass alloy characterized by containing 62.5-63 wt% copper, 0.16-0.24 wt% lead, 0.55-0.7 wt% aluminum, and balance zinc in the total weight.

The method according to claim 1,
Characterized by further comprising at least one element selected from the group consisting of 0-0.02 wt% of antimony, 0-0.2 wt% of tin, 0-0.01 wt% of magnesium and 0.09-0.12 wt% of arsenic of the total weight of the brass alloy Low lead brass alloy.

3. The method of claim 2,
Characterized by further comprising at least one element selected from the group consisting of 0.0005-0.0009 wt% of boron, 0.05-0.15 wt% of iron, 0-0.15 wt% of nickel, and 0-0.005 wt% of zirconium of the total weight of the brass alloy Low lead brass alloy.

Brass Alloy: 62.5-63wt% copper, 0.16-0.24wt% lead, 0.55-0.7wt% aluminum, 0-0.02wt% antimony, 0-0.2wt% tin of the total weight of the brass alloy, 0 to 0.01 wt% of magnesium, and a balance of zinc.

5. The method of claim 4,
At least two elements selected from among arsenic of 0.09-0.12 wt% of the total weight of the brass alloy, 0.0005-0.0009 wt% boron, 0.05-0.15 wt% iron, 0-0.15 wt% nickel, and 0-0.005 wt% zirconium Further comprising a second lead-free brass alloy.

Brass alloys: 62.5-63wt% copper, 0.16-0.24wt% lead, 0-0.02wt% antimony, 0-0.01wt% magnesium, 0-0.2wt% tin, 0.0005-0.0009wt% Boron, 0.55-0.7 wt% aluminum, 0.05-0.15 wt% iron, 0-0.15 wt% nickel, 0.09-0.12 wt% arsenic, 0-0.005 wt% zirconium, 0-0.01 wt% A low lead brass alloy characterized by containing residual zinc.