TW200900513A - Austenitic free-cutting stainless steel - Google Patents

Abstract

The present invention relates to an austenitic free-cutting stainless steel, containing: by weight percent, 0. 500% or less of C; 0. 01 to 5. 00% of Si; 0. 01 to 10. 00% of Mn; 5. 00 to 25. 00% of Ni; 7. 50 to 30. 00% of Cr; 0. 300% or less of N; more than 0. 0100% but not more than 0. 1000% of O; 0. 0020 to 0. 1000% of B; 0. 300% or less of Al; and the remainder of Fe and inevitable impurities, the steel satisfying the following formula (1): 0. 68≤ [O]/[B]≤ 2. 50 …(1) In which [O] represents the content of O and [B] represents the content of B.

Description

200900513 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a Voss preparation [Prior Art] (4) Tiantie ^ cut stainless steel. Since Worthfield iron-based stainless steel contains a relatively large alloying element, its raw material itself is: or: Therefore, in order to reduce the manufacturing cost of the entire component, it is mussel. Sex. So far, there is a need for an easy-cutting property = an element of good machinability, such as Pb "3 has changed SUS3〇3). Knife stainless steel (such as: However, from the point of view of environmental concerns in recent times, it is not good to add pb (the easy-cutting element of the system) to the steel. In addition, s as a member, the element system will form in steel. Sulfides such as MnS and improved cuts (4): And 'due to the large amount of sulfides will degrade the maximum corrosion of stainless steel, so the amount of addition is limited. In addition, the addition of force = in some cases will make The hot workability is deteriorated. In this respect, in order to overcome the aforementioned problems, it has been mentioned that the ^62 rhyme 252 series reveals a kind of Wogang steel, which contains the following elements (in weight percentage): c., 〇. 15% Heart: 0.35 to 0.73%, this: 0.15 to 9 53%: Bu ^ to 0.025%, S: G.GG2 to 〇._, Ο: 1〇.32 to 3 · Νι: 4.98 to 30. 00%, Bi : 〇· 〇2 to 〇. 20%, sn 〇〇0. 21%, B: 0. 0040 to 〇. 0200%, 〇: 〇· 〇〇47 to 〇N: 0.02 to 0.07%, and the rest And unavoidable impurities. 0' 97111699 5 200900513 This document shows that the deterioration of hot workability by adding b for improving machinability can be suppressed by adding B and as Sexually harmful elements. Tantalum for thermal processing in addition to 'JP-A-62-30860 series reveals - cut stainless steel, which contains the following elements (to weight eight pounds of Tiantie easy knife tc* juice): ρ · Α Λ 1 To 1616%, Si: 0.28 to 0.75%, Μη: 0 75 . U·01

Main y · ϋ 5 %, c r. 1 only 9 R to 26. Right '12. 〇〇 to 30._,: 〇〇 2.. 〇·021 to 0.080%, S·· 〇·_ to 〇. 05〇%, p: 〇° 'B: 〇其=° ; °. 〇22 to 〇. °51% ' 〇: 〇. °〇16 to 〇· 〇_, and the rest are Fe and unavoidable impurities. In this document, it is revealed that the addition of Bi improves the cut-off im, and the deterioration of hot workability due to the addition of Bi can be suppressed by adding B. The easy-cut effect of the easy-cut element Pb means embrittlement caused by liquid metal. When the cut portion is heated to a high temperature during the cutting of the steel, it is used as a low-melting-point metal (melting temperature··330. The Pb of the crucible melts. The molten crucible makes the workpiece brittle) and thus improves the machinability. Pb steel is used as Pb-free cut steel. However, all of these reports indicate that "under certain cutting conditions" achieves comparable machinability to Pb-free steel. In addition to the rare source of Bi, no one has published it. An easy-cut element that replaces the easy-cutting effect (embrittlement caused by liquid metal) equivalent to the easy-cut element Pb. SUMMARY OF THE INVENTION One problem to be solved by the present invention is to provide a property that does not deteriorate corrosion resistance, and Worstian Iron 97111699 6 200900513 with the machinability comparable to Pb-cut steel is easy to cut stainless steel. = Problem, the present invention provides the following items (1) to (10). The stainless steel of the knife comprises: 匸 0.50% or less by weight; 0. 01 to 5. 〇〇% of Si; 〇· 01 to 10. 〇〇% of Mn; 5. 00 to 25. 〇 〇% of Ni; 7. 50 to 30. 〇〇% of cr; 0.300% The following n; more than coffee but not more than 0·1_% of 0; 0.0020 to 〇, 100〇% of 8; 0. 300% or less of A!; and the rest of Fe and inevitable impurities, The steel satisfies the following formula (1): 0.68 <[〇]/[B]^2.50 (1) where [〇] indicates the content of 0 and [B] indicates the content. (2) The Vostian Iron System (4) according to (1) It does not contain _, which contains an oxide-based inclusion containing B dispersed therein. (3) Root: Kang (2) of the Wostian iron-based easy-cut stainless steel, wherein the oxide-based inclusion further contains si (4) According to (1) to the work, ~ Bayi, the Worth Iron is easy to cut steel, which contains 0_100% or less by weight of c, 97111699 200900513 ο 01至3. 00% of Si '15· 00 to 25. 〇(10) of Cr, 0. 100% or less of N ' is more than 0. 0100% but not more than 0. 0500% of 0, and 0. 0080 to 0. 1 000% of B. (5) The Vostian iron according to any one of items (1) to (4) is easy to cut steel, where the steel contains 0.050% by weight. % or less of N, more than 0. 01 00% but not more than 0. 0500% of 〇, and 〇. 0120 to 0. 0800% B. (6) The Vostian Iron-based easy-cut stainless steel according to any one of (1) to (5), further comprising: a sulfide, a nitride, a carbon sulfide, and a selenium At least one of the group consisting of the compounds. (Ό) The Wostian Iron according to any one of items (1) to (6) is easy to cut stainless steel (further, further comprising, by weight percent, selected from: 〇. 01 to 0. 50% of S, And at least one of the group consisting of 〇· 01 to 0·50% of se. (8) The Vostian iron-based easy-cut stainless steel according to any one of (1) to (7) In weight percent, selected from: 〇. 01 to 0·40% of Pb, 〇· 01 to 0·40% of Bi, 〇· 01 to 0. 40% of Te, 97111699 8 200900513

0. 01 to 0_ 40% of Sn, and 0. 01 to 0. 40% of the group consisting of at least one of P. (9) The Woustian woven steel according to any one of (1) to (8), further comprising, by weight percent, from 0. 01 to 8 00% of Mo, which is easy to cut.

〇. 01 to 4. 00% of W, and at least one of 〇· 01 to 5. 00% of Cu. (1) 沃 〇 01 选自 选自 选自 选自 选自 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 00%的零, 00% of the Nb, and 0. 01 to 2. 00% of the Zr

At least one of the group consisting of. (11) The Vostian steel according to any one of (1) to (1), further comprising, by weight percent, selected from the group consisting of: 糸 切 不 〇 〇〇 〇〇 〇〇 〇〇 〇〇 〇〇 〇〇 At least one of the group consisting of Mg, and 0.0001 to 0.0100% of Ca. (12) The Voss steel according to any one of (1) to (11), which is obtained by heat treatment in the range of 1000 to 13 Torr (within 24 hours). 5 points 97211699 9 200900513 (13) - The manufacture of the Vostian iron system is easy to prepare a steel, which comprises a method of weighing eight hundred steel, which includes: C of 0.500% or less, 77 十 之 0. 01 to 5. 00% of Si, 0. 01 to 10. 00% of Μη, 5. 00 to 25. 00% of Ni, 7. 50 to 30. 00% of Cr, 〇 · 300% or less of N, more than 0.0100% but not more than 〇1〇〇〇% 〇0. 0020 to 0· 1 000% of B, 0. 300% or less of Α1, and the rest are Fe and Inevitable impurities, the steel satisfies the following formula (1) ·· (1) ο. 68<[0]/[B]<2.50 ί) where [〇] represents the content of 0 and [β] represents β The content is melted and the steel is cast; and the steel is accepted to be deleted. Heat treatment in the range of c to the period of 24 hours. It is said that the amount of 5 knives and 1 amount is not conducive to the hot workability of the ; :: The Worthfield iron of the Shite is not recorded, and the heat is applied to the hot steel, even if it is High machinability can also be obtained in the case where steel does not contain elements such as S, Pb, and bismuth. According to this, it is due to the fact that it contains a relatively large amount of "B" oxygen and a low melting point telluride (melting temperature: 480. 〇) or a composite oxide containing B 97111699 200900513 dispersed in steel". Brittleness caused by liquid metal in the field [Embodiment] Hereinafter, a specific example of the present invention will be described in detail. The Worthite iron element and the remaining Fe and the unavoidable miscellaneous stainless steel according to the present invention comprise the composition ratios shown below, and the limitation thereof: the type of the added elements, in the present specification, all by weight | The =, the project is as follows. Here, the percentages defined are the same. The knife ratio is different from the mass (OC: 0.500% by weight or less, c element is a Worth field, and the phase is generated. In addition, since the C system is a gap element, 2 stabilizes the strength of the Worth field. On the other hand, When the content of C is too high, the dissolved Cr in the parent phase is reduced to the carbonization of Cr in the improvement of the mechanical substance. Therefore, the content of C is preferably 0 500% by weight or more. 〇 100% by weight or less. The content of one °c is better (2) Si: 〇. 01 to 5. 〇〇% by weight

The Si element is added as a silking agent. In order to achieve hydrazine, the content of Sl is preferably 0.01% by weight or more. Oxygen On the other hand, the excessive addition of the ferrite of the Si-based ferrite causes the Vostian body phase to be unstable. Further, 1, therefore, the precipitation of the σ phase is caused, thereby deteriorating the corrosion resistance. Therefore, 2 is preferably 5.00 wt% or less. Take 3 miles or less. ^ is 3·00% by weight or 97111699 200900513 (3) Mn: 〇. 01 to i〇. 重量 Weight % The Μη element is a Worth field generating element' and it helps to stabilize the Vostian phase. In order to achieve this effect, the content of Μη is preferably 〇〇1% by weight or on the other hand, when an excessive amount of Μη is contained, the pitting resistance of the steel (pitti called corrosion resistance) is deteriorated. Therefore, it is 10.00% by weight or less.

The content of Mn is preferably

(4) Ni: 5. 〇〇 to 25. 00% by weight

The Ni element is a Worth field that produces elements and helps to stabilize the Vostian body phase. In order to achieve this effect, the content of Ni is preferably 5 〇〇 or more. 〆 On the other hand, when an excessive amount of Ni is added, precipitation of the 〇 phase is promoted, and corrosion resistance is deteriorated. Therefore, the amount of addition of Ni is preferably 25 〇〇 by weight or less. (5)Cr: 7. 50 to 30. 00 weight %

The Cr element is an important element that contributes greatly to the improvement of corrosion resistance and mechanical strength. In order to achieve this effect, the content of Cr is preferably 7.5 % by weight or more. The content of Cr is more preferably 15.% by weight or more. On the other hand, excessive addition of Cr will result in undissolved during solution processing.

The residual amount of Cr carbonitride is increased, so that the corrosion resistance is remarkably deteriorated. Therefore, the amount of Cr is preferably 3% by weight or less. The content of Cr is more preferably 25.00% by weight or less. (6) N: 0.300% by weight or less The N element is a gap element, and 1 is significantly effective for the pair of $, for the improved machine maple strength, the stable Voss 97111699 200900513 field body phase, and the improved corrosion resistance. On the other hand, when N is excessively added, a large amount of undissolved nitrogen and a large amount of nitride remain in the steel during the solution treatment, and thus the corrosion resistance is remarkably deteriorated. Therefore, the content of N is preferably 〇3〇〇% by weight or less. n: preferably 〇.1〇% by weight or less, and more preferably 0.050% by weight or less. (υο: more than 0.0100% by weight but not more than 〇1% by weight. 0 Element--It is said that the cleanliness of the steel is deteriorated, so that the corrosion resistance (4) processability is remarkably deteriorated. However, when the Β is added To the Worthfield Iron 2 steel, and further adding a specific amount or more of 0 to it; :, and adding a conventional easy-cut element can be obtained with Pb-containing = raw 〇. To achieve this - The effect is preferably more than ": heavy summer %. The content of bismuth is more than 0.0200% by weight. On the other hand, when bismuth is added in excess, 'corrosion resistance and thermal processing dan. Therefore, The content of bismuth is preferably 〇1% by weight or less. More preferably 畺, 〇50〇% by weight or less. 3 (8)B: 0. 0020 to 〇. 1〇〇〇% by weight Λ元t: It is said to be effective for improving mechanical strength and hot workability, and when the B is not dissolved in the matrix and is dispersed in the steel to become inclusions containing diterpenes, the machinability is improved. This effect is also inferior to 1' two times = two heat / wideness will deteriorate and the corrosion resistance "U"] 3 of 3 Ϊ is preferably 〇1〇〇〇% by weight or less. 699 13 200900513 The content of B is more preferably 0.0800% by weight or less. (9) A1: 〇. 300% by weight or less of the A1 element is an oxide forming element. When a1 is excessively added, Al2〇3' is preferentially produced. It is difficult to form a B-containing oxide which can improve machinability in the present invention. Therefore, the content of A1 is preferably 〇300% by weight or less. (10) [〇]/[B] is in the present invention, The improved easy-cut property 'disperses the oxide-based inclusions containing B in the steel. The difference between the present invention and the conventional easy-cut stainless steel is in this respect. The content ([0]) is sufficient for practical use of B The easy-cutting effect, the content ([B]) is better than the following formula (1). 0. 68<[0]/[B]<2. 50 ...(1) When [〇]/[B When the ratio is too small, since the amount of ruthenium is relatively small, a sufficient amount of oxide-based inclusions may not be dispersed in the steel. Therefore, [0]/[B] is better than 68. 68 or more. - On the other hand, when the ratio is too large, the amount of 〇 becomes too large, which may cause deterioration of corrosion resistance and hot workability. Therefore, [〇] is better than 2·50 or below. Next, the Vostian iron-based non-mineral steel according to the present invention is obtained by melting and casting a steel having a predetermined composition, and then subjecting the steel to a heat (4) under a predetermined condition. At the time of treatment, B contained in the steel may be completely or partially dispersed in the oxide-based inclusions of =. In order to obtain high machinability, the oxide-based inclusions preferably further include Si. Machinability is achieved by 8 And the coexistence of ^ and 97111699 14 200900513 & This is believed to be due to the fact that β is dissolved in the oxide having the structure of the scratch, thereby forming an oxide compound, and the oxide is dispersed in the steel. ° The more oxide-containing inclusions containing β, the greater the machinability. In order to achieve high machinability, the area ratio of the oxide-based inclusions containing β is preferably 0.01% or more. In the second aspect, when the amount of the oxide-based inclusions is too large, hot workability and == are deteriorated. Therefore, the area of the oxide-based inclusions containing β is 10% or less than that of the car. In the case of 纟Steel, there are also oxides other than oxide-based inclusions containing bismuth, and it is difficult to remove oxides other than oxide-based inclusions containing β. . Therefore, it is preferred that the ratio of the oxide-based inclusions containing 6 in the entire oxide is 50% or more. In the Vostian iron-based non-recording steel according to the present invention, the machinable oxide-based impurities are dispersed in the steel to be improved; == the easy-cut stainless steel may only contain the oxide-based inclusions containing β Or, in addition to the emulsion-based inclusions of the crucible, it may contain a conventional easy-cut element (ie, at least one of sulfide, nitride, and carbon sulfide which effectively improves the cutoff). In other words, the Voss element according to the present invention further comprises an element selected from the first element (the first additional element). The field iron free-cutting stainless steel can be at least (11) S: 0·01 to 〇. 50% by weight of the group consisting of the above S and Se, thereby effectively improving the machinability of the S element and the Mn in the steel to form MnS, 97111699 200900513 In order to achieve this effect, the content of s is preferably G G1% by weight or more. On the other hand, when S is excessively added, hot workability is deteriorated, and corrosion resistance is also deteriorated due to formation of MnS. Furthermore, when the amount of s is unnecessarily lowered, the manufacturing cost becomes high. Therefore, the weight is % or less. Therefore, the reading of S is preferably 〇.50 (12)Se: 0.01 to 〇.5〇% by weight. To achieve this effect, the corrosion resistance, toughness and ductility of Se

The element of Se also contributes to the improvement of the machinability. The content of 1 is preferably 0.01% by weight or more. On the other hand, when it is excessively added, the workability is deteriorated. Therefore, the content is preferably or below. Wang Li / 0 (13 Pb (14) Bi (15) Te (16) Sn 〇·〇1 to 0.40% by weight 0.01 to 0.40% by weight 0.01 to 0.40% by weight 0.01 to 〇.4〇% by weight (17) Ρ: 0. 01 to 〇 · 40 weight 〇 / 〇 Pb, Bi, Te, Sn and Ρ all have a change in white 忐 忐 .. Eight have improved machinability effect. To achieve this effect, the content of each element is preferably η ηι s ^ , Ripping is 0.01% by weight or more. This I-:, 'excessive addition of each of these elements, _ deterioration. The addition amount of the inferior is preferably q.4 (^4% or less. In addition) According to the present invention, the core material (four) stainless steel may be in the first amount: the Wostian iron-based easy-cut stainless steel according to the present invention may comprise a group selected from & mS ρ in addition to or instead of the outer halogen. At least one element (second additional element). 97111699 16 200900513 The outer element and/or the second additional element comprise or consist of selected from Mo, W and Cu. At least one element of the group (the third additional element). (18) Mo: 〇. 〇1 to 8. 〇〇 weight %

The Mo element can significantly improve the corrosion resistance. Further, M〇 is used as a solid solution hardening element to improve mechanical strength. 01重量百分比或以上。 In order to achieve this effect, M 较佳 is preferably 0.01% by weight or more. 3 On the other hand, when ruthenium is added in excess, brittleness and ductility are deteriorated, so that it becomes valuable during forging. The content of cerium is preferably 8.00% by weight or less. . . Thus, (19)W: 0. 〇1 to 4. 重量 % by weight and as a solid effect, the content of W is similar to Mo, the w element contributes to the improvement of corrosion resistance, and the solution hardens the element to improve the mechanical strength. To achieve this amount, it is preferably 0.01% by weight or more. On the other hand, similar to Mo', when the w is excessively added, the brittle phase makes the knives and elongations worse. Therefore, the inclusion of W in the W also becomes _u·· 〇.〇1 to 5.00% by weight.

The Cu bismuth-based Worth field produces elements and has a right-body phase. In addition, Γ一 /, helps to stabilize the Worthfield (4) In addition, Cu helps to improve the effect of the 4, Cu contains & Λ ηι 7 erosive〗. In order to achieve this, it is preferably 〇.〇1% by weight or more. When hot Cu is added in excess, 'hot workability

The Cu 3 is preferably set to 5. (10)% by weight or less. d. Therefore, in addition, at least/cut stainless steel of the third additional element of the Vostian iron according to the present invention may be selected from the first to or instead of the selected from 97111699 200900513

At least one of the groups consisting of Ti, V, Nb, and Zr—open (21)Tl: 0.01^ 2.00 tt%

The Ti element combines with C or N, thus helping to minimize grain modification. In order to achieve this effect, Ti insects have the amount of money above. On the other hand, when T1 is excessively added, a large amount of compound remains in the steel, thereby deteriorating the corrosion resistance. The amount of the mash and the mash is preferably 2.00% by weight or less. ΐ 之 contains (22)\^: 〇.〇1 to 2. 〇〇% by weight Similar to Ti, the combination of V elements, thus contributing to strength and minimizing grain size. To achieve A meaning* * 0.01% by weight or more. The higher the V content, the better

On the other hand, when V is excessively added, it is combined with the right-handed female MA steel, so that the nitride having a large amount of L 3 remains in the U and deteriorates the corrosion resistance. Therefore, v% by weight or less. 0 乂仫 乂仫 is 2. 00 (23) Nb: 〇. 01 to 2. 〇〇% by weight Similar to Ti and v, Nb element combines good mechanical strength with c or n and minimizes grain size to help to modify Comparison: 〇.〇1% by weight or more. In addition, when Nb is added in excess, there will be a large dan of the servant in the steel, so that the resistance of the 卜 卜 曰 大 大 大 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2.. Deterioration. Therefore, the content of the sensation is preferably (24-)Zr·· 〇·01 to 2.00% by weight π兀素 contributes to improvement of mechanical strength. 01重量百分比或以上。 In order to achieve this effect, Zr 97111699 18 200900513 content is preferably 0.01% by weight or more. On the other hand, when zr is added, the edge and ductility will deteriorate. Therefore, the content of Zr is preferably 2.00% by weight or less. Further, the Vostian iron-based easy-cut stainless steel according to the present invention may contain at least one of the first to fourth additional elements or may comprise at least one element selected from the group consisting of Mg and Ca ( The fifth extra element). (25) Mg: 〇. 〇〇〇1 to 〇. 〇1〇〇 Weight % (26) Ca: 0. 〇〇〇1 to 〇. 01〇〇 Weight %, and, elements can effectively improve hot working; In addition, the machinability is improved. It is considered that this is due to the fact that p is another double ό ^ 亍 于 in Ca has an effect of allowing the oxide having a salt structure which contributes to the improvement of the properties to be more sturdy in the steel. To achieve this effect, Mg & ^ 〇. 眶 wt% or more. The content of each of Mg*Ca is preferably on the other hand, when these elements are excessively added, the workability is deteriorated. Therefore, 1 each has one or less. /, each of the readings is preferably O.Gm% by weight. In terms of =, a specific example of each element contained in the steel of the present invention, which is present in steel, is the smallest amount, and the research and development steel The smallest of the non-I deniers 1 and 2 used in the examples, the maximum amount of which is present in the steel is the maximum amount used in the embodiment of the steel. SUMMARY OF THE INVENTION Next, a Vostian manufacturing method according to the present invention will be explained. The Wostian iron system according to the present invention is easy to cut stainless steel with the easy-cut stainless steel. You have the steel of the aforementioned composition by melting and casting 97111699 19 200900513 j, and then the steel is subjected to the treatment under the predetermined conditions. And get. When the steel is subjected to heat treatment under predetermined conditions, B in the package =: is completely or partially dispersed in the steel to become an oxide-based inclusion containing B. In order to obtain high cutting 枓 better, step-by-step is included. In general, when the heat treatment temperature is too low, it is impossible to produce B-containing impurities in the steel. In order to produce oxide-based inclusions containing β, the heat is: Pain or above. The heat treatment temperature is preferably or above. :: In general, the higher the heat treatment temperature becomes, the more likely it is to produce a compound-based inclusion. However, when the heat treatment temperature is excessively entangled to produce a material t having a non-uniform composition, the heat treatment temperature is preferably 130 (rc or less. The degree is more preferably 1 250T: or less. ... /m = During the treatment period, the amount of the inclusions containing the oxide-based inclusions of B is generated. Generally, the longer the heat treatment period, the larger the amount of the impurities becomes. In order to produce a sufficient amount of the inclusion-containing inclusions, heat treatment is performed. The period is preferably within 5 minutes. The heat treatment time is preferably in the range of 5 minutes", and the range of ¥ will be explained next. The effect of the method is as follows: ..."The conventional knowledge of quantity is said to be detrimental to the hot workability. 下 下 对 对 对 I I I I I 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋 疋In steel, such as s, pb, 97111699 20 200900513

In the case of Se and Te, which are easy to cut, high machinability can also be obtained. It is believed that this is due to the fact that when a relatively large amount of cerium is contained, the oxide of β (which is a low-point oxide (throwth temperature: 48{rc)) or a composite oxide containing β is dispersed in the steel, and thus is cut. During the period, it is caused by liquid metal. Further, when the oxide-based inclusions further contain a temple in addition to B, the same machinability can be obtained. It is considered that this is because when Si is contained in the oxide-based inclusions, a liquid phase mainly composed of a fatty acid salt oxide is easily formed during the cutting. Further, the tool of the Wostian Iron-based non-ferrous steel according to the present invention is relatively small in wear. It is believed that this is due to the tendency to produce deposits containing b-oxides (so-called belags) on the surface of the tool. [Examples] [Comprehensive Examples 1 to 4 2 and Comparative Examples 1 to 13] Using a high frequency induction furnace, there will be a watch! And each of the alloys of the chemical composition shown in 2 was melted and cast to obtain an ingot of 50 kg. Next, the coins are heated and then hot forged to produce a circular rod with a diameter of 24 mm. The circular rod thus obtained is then subjected to heat treatment. The heat treatment was carried out by maintaining the rod at 1150 ° C for 1 hour, followed by cooling with water. 97111699 21 200900513 [Table 1] Composition (% by weight) C Si Niη Ni Cr N A1 0 B Other [〇]/[B] Example 1 0.011 0. 29 0.85 9.5 17.5 0.021 0.001 0.0215 0.014 1.54 Example 2 0.010 0.82 1.21 9.4 17.7 0.014 0.002 0. 0250 0.016 1.56 Example 3 0.035 0. 52 0.11 7.8 17.3 0.022 0.001 0. 0188 0.021 0. 90 Example 4 0.005 1.42 1.16 9.8 18.4 0. Oil 0. 001 0. 0231 0.029 0.80 Example 5 0.018 0. 66 1.52 8.9 18.7 0.006 0.004 0.0102 0. 007 1.46 Example 6 0.068 1.17 0.47 9.5 19.3 0. 043 0.005 0. 0224 0.022 1.02 Example 7 0.033 1.40 0. 27 8.7 19.2 0.018 0.003 0. 0273 0.016 1.71 Implementation Example 8 0. 054 1.06 0.87 10.1 17.7 0.021 0.002 0. 0125 0.007 1.79 Example 9 0.016 0. 74 0.44 7.9 17.6 0.016 0. 001 0. 0216 0.009 S: 0.06 2.40 Example 10 0.022 0.53 1.19 9.4 18.5 0.021 0.001 0. 0253 0.019 S: 0.31 1.33 Example 11 0.066 0.26 0. 29 10.3 18.7 0.023 0.009 0. 0206 0. Oil S: 0.48 1.87 Example 12 0.005 0.13 1.19 9.7 17.9 0.011 0.011 0. 0213 0. 021 Se:0. 07 1.01 Example 13 0.025 0. 29 0.58 9.3 1 6.9 0.009 0.001 0. 0196 0.016 Se: 0.43 1.23 Example 14 0.002 0. 08 1.87 10.3 15.3 0.008 0. 002 0.0163 0.018 Pb:0. 04 0.91 Example 15 0. 044 0. 09 1.45 12.6 19.3 0.011 0.002 0. 0253 0.029 Pb: 0.31 0.87 Example 16 0.019 0.12 0. 03 16.2 18.3 0. 009 0.001 0.0195 0.028 Bi: 0.11 0.70 Example 17 0.014 0.44 0.54 11.8 17.4 0.005 0.002 0. 0228 0.011 Bi: 0. 34 2.07 Example 18 0.031 0 99 0.29 9.2 16.9 0.016 0.001 0. 0218 0.015 Te:0. 09 1.45 Example 19 0.022 1.42 0. 65 8.4 13.2 0.021 0.043 0. 0257 0.019 Ti:0. 33 1.35 Example 20 0.006 4. 32 0.85 7.2 16.1 0.015 0.055 0. 0241 0.011 Sn:0. 02 2.19 Example 21 0.036 0. 89 0. 39 19.4 11.2 0.018 0.001 0. 0281 0.031 Sn: 0. 39 0.91 Example 22 0.006 3. 83 2. 65 23.2 9.2 0.011 0. 002 0. 0246 0.024 P:0. 02 1.03 Example 23 0.009 0. 68 1.20 9.6 17.3 0.011 0.001 0.0210 0.011 P: 0.12 1.91 Example 24 0.026 2.46 0.73 20.3 8.9 0.014 0.001 0. 0228 0.022 P: 0.36 1.04 Example 25 0.421 1.85 0.98 18.4 7.9 0.019 0.001 0. 0266 0.014 Mo :0. 21 1.90 Example 26 0.015 1.56 1.62 13.9 26.0 0. 002 0.021 0. 0246 0.011 Mo : 4. 38 2.24 Example 27 0.094 1.29 2.48 9.7 25.7 0.006 0.265 0.0192 0.012 W: 0.09 1.60 Example 28 0.088 0. 20 3.10 7.3 29.3 0.004 0. 003 0.0198 0.009 W: 2.39 2.20 Example 29 0.021 0.29 1.11 23.4 26.3 0.009 0.002 0. 0178 0.008 Cu:0. 06 2.23 Example 30 0.016 0.91 1.84 17.5 21.3 0.022 0.004 0.0159 0.014 CU: 2.68 1.14 97111699 22 200900513 [Table 2 Composition (% by weight) C Si Niη Ni Cr N A1 0 B Other [〇]/[B] Example 31 0.021 3.11 0.44 9.8 22.4 0.081 0.003 0.0111 0.008 Ti: 1.83 1.39 Example 32 0.008 2.84 0.74 6.3 17.9 0.068 0.001 0.0220 0.009 V: 1.49 2.44 Example 33 0.009 0.22 2.63 17.3 13.7 0.211 0.001 0.0291 0.023 Nb: 1.73 1.27 Example 34 0.013 0.42 1.18 14.9 18.9 0.191 0.001 0.0225 0.018 Zr: 1.79 1.25 Example 35 0.049 0.33 6.90 22.5 15.9 0.248 0.002 0.0416 0.049 Mg: 0.0013 0.85 Example 36 0.016 0.24 1.62 21.5 16.3 0.137 0.001 0.0338 0.032 Mg: 0.0065 1.06 Example 37 0.052 0.31 8.44 11.6 19.3 0.133 0.001 0.0612 0.029 Ca: 0.0009 2.11 Example 38 0.009 0.29 0.85 9.5 17.5 0.021 0.001 0.0102 0.007 Ca: 0.0003 1.46 Example 39 0.013 0.55 0.53 9.4 17.7 0.014 0.002 0.0188 0.021 Ca: 0.0005 0.90 Example 40 0.028 0.52 0.11 7.8 17.3 0.022 0.001 0.0215 0.014 Ca: 0.0008 1.54 Example 41 0.006 1.42 1.16 9.8 20.3 0.011 0.001 0.0250 0.016 Ca: 0.0017 1.56 Example 42 0.016 0.66 1.52 8.9 18.7 0.006 0.004 0.0231 0.029 Ca: 0.0046 0.80 Comparative Example 1 0.522 0.10 2.95 13.4 17.9 0.011 0.003 0.0492 0.021 2.34 Comparative Example 2 0.012 7.80 1.62 21.5 16.3 0.012 0.002 0.0338 0.032 1.06 Comparing with vehicle 3 0.002 3.20 12.40 21.3 18.4 0.043 0.009 0.0440 0.022 2.00 Comparative Example 4 0.035 4.20 0.04 4.3 8.9 0.280 0.022 0.0600 0.052 1.15 Comparative Example 5 0.002 0.08 1.87 28.5 15.3 0.150 0.019 0.0441 0.039 1.13 Comparative Example 6 0.018 0.59 0.92 8.9 6.8 0.005 0.051 0.0224 0.033 0.68 Comparative Example 7 0.009 0.22 2.63 17.3 32.4 0.184 0.002 0.0291 0.021 1.39 Specific Example 8 0.013 2.33 1.92 9.2 21.5 0.410 0.004 0.0118 0.016 0.74 Comparative Example 9 0.012 0.95 1.32 9.6 18.40.022 0.008 0.0039 0.004 0.98 比车交例10 0.009 0.22 2.63 17.3 13.6 0.211 0.002 0.1031 0.023 4.48 Comparative Example 11 0.005 0.10 2.95 16.8 17.4 0.009 0.004 0.0492 0.002 32.80 Comparative Example 12 0.011 0.29 0.85 9.5 17.5 0.021 0.210 0.0215 0.101 0.21 Comparative Example 13 0.011 0.32 0.84 9.5 17.3 0.016 0.380 0.0221 0.023 0.96

97111699 23 200900513 2. Evaluation (1) On the obtained round bar, (1) Composition of inclusions: After heat treatment, use EpMA to make ! Line composition analysis.阙 氧化物 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成 组成(2) Oxide area ratio: w ′° Measurement and color extraction of all oxide-based, =microphotographs by means of a microscope of 200 times power, and by surface-based impurities based on oxides Treatment, measurement (3) Corrosion resistance aphid property A heat-treated round bar was sprayed on the salt water to measure the rate of iron embroidery. Shout, respectively, 96 hours. The table is not awkward. The person who lacks the area ratio of the iron-embroidered area is 3%. The person who embroidered the area ratio of the iron-embroidered area of 3% or more is expressed as "◦. ', ,," and (4) the perforation of the drill bit. · ~ ” The hole is perforated with a SO 51 drill (diameter: 5 mm). Set the grinding speed to 15 m bar. The head perforation property is set up until the drill bit is broken = = : = degrees. (4) Evaluation of the number of holes to be drilled (5) Value of abrasion resistance: The value of the abrasion resistance of the test in the bit piercing test (6) Chip fractureness: 97111699 24 200900513 Measurement in the bit perforation test Do not curl the number of three or three, the chip curl. The ten is expressed as "B", and the volume is: :=:A", 3. The result (1) is not "C". Figure Ϊ shows that the use of ΕΡΜΑ is also cautious! From the π-analyzed-fruit...I obtained the group of materials, the result shown in the figure = found that the peak of Β and Si was confirmed by the confirmation of the oxygen peak. This shows that the inclusions contain oxides of cerium and S i . The evaluation test results are shown in Tables 3 and 4. 97111699 25 200900513 [Table 3]

Ingredient composition oxide area ratio (%) Corrosion resistance bit perforation property (piece) Value of profitability (MPa) Chip breaking property Example 1 A 0. 02 A 45 219 A Example 2 A 0. 03 A 49 224 A Example 3 A 0. 02 A 47 224 A Example 4 A 0. 02 A 49 227 A Example 5 A 0. 02 A 38 231 A Example 6 A 0. 02 A 49 205 A Example 7 A 0. 03 A 51 221 A Example 8 A 0. 02 A 39 220 A Example 9 A 0. 02 A 51 204 A Example 10 A 0. 03 A 55 214 A Example 11 A 0. 02 A 58 211 A Example 12 A 0. 02 A 51 221 A Example 13 A 0.02 A 39 219 A Example 14 A 0. 02 A 39 216 A Example 15 A 0. 03 A 55 217 A Example 16 A 0.02 A 39 219 A Example 17 A 0. 03 A 56 221 A Example 18 A 0. 02 A 46 206 A Example 19 A 0. 03 A 52 201 A Example 20 A 0. 03 A 51 209 A Example 21 A 0. 03 A 46 205 A Example 22 A 0. 03 A 45 217 A Example 23 A 0. 02 A 49 214 A Example 24 A 0. 02 A 51 211 A Example 25 A 0. 03 A 47 219 A Example 26 A 0. 02 A 49 221 A Example 27 A 0. 02 A 39 220 A Example 28 A 0. 02 A 39 216 A Example 29 A 0. 02 A 38 205 A Example 30 A 0. 02 A 39 221 A 97111699 26 200900513 [Table 4]

Inclusion composition composition oxide area ratio (%) Corrosion resistance bit perforation property (piece) Resistance to abrasive value (MPa) Chip breaking property Example 31 A 0.02 A 39 218 A Example 32 A 0.02 A 49 208 A Implementation Example 33 A 0. 03 A 45 205 A Example 34 A 0.03 A 49 216 A Example 35 A 0.05 A 48 221 A Example 36 A 0.04 A 45 218 A Example 37 A 0.03 A 42 219 A Example 38 A 0.02 A 49 220 A Example 39 A 0. 02 A 52 217 A Example 40 A 0.02 A 53 215 A Example 41 A 0.03 A 55 210 A Example 42 A 0.02 A 57 206 A Comparative Example 1 A 0.05 C 44 220 B Comparative Example 2 A 0. 03 C 43 211 B Comparative Example 3 A 0.04 C 44 216 A Comparative Example 4 A 0.06 C 42 221 A Comparative Example 5 A 0. 02 C 41 218 B Comparative Example 6 A 0.02 C 40 210 B Comparative Example 7 B 0.01 C 11 319 C Comparative Example 8 B 0.01 A 16 289 C Comparative Example 9 A 0.01 A 17 281 B Comparative Example 10 B 0.04 B 12 299 B Comparative Example 11 B 0.01 C 24 304 C Comparative Example 12 A 0.01 C 49 216 B Comparative Example 13 B 0.02 A 12 302 C 97111699 27 200900513 The corrosion resistance of the stainless steel of Comparative Example 1 was poor. This is because the amount of c is too high, so that carbides of Cr are produced. The stainless steel of Comparative Example 2 was inferior in corrosion resistance. This is because it is high, so many σ phases remain. ° Corrosion resistance of stainless steel of Comparative Example 3. This is because the height of the fairy is high, so the resistance to the hole is degraded. The stainless steel of Comparative Example 4 was inferior in corrosion resistance. This is because the amount of Νι is too small to exhibit the corrosion resistance of Ni itself. The stainless steel of Comparative Example 5 was inferior in purity. This is due to the high 'and thus many σ phases remain. The stainless steel of Comparative Example 6 was inferior in corrosion resistance. This is because the amount of Cr is too small to improve the corrosion resistance. The non-mineral steel of Comparative Example 7 was poor in corrosion resistance and machinability. This is because the amount of ruthenium is too large' thus leaving a lot of undissolved & nitride and ^ and B forming a compound. The (four) m difference of the stainless steel of Comparative Example 8. This is because the amount of N is too high, so many undissolved nitrides remain and & σ Comparative Example 9 does not have a _ difference. This is because the amount of oxygen is low, so that the amount of the base-cut oxide which can effectively improve the machinability is small. - Comparative Example 1 The corrosion resistance of stainless steel is quite poor and is due to the excessive amount of oxygen. I" produces this and thus the amount of B in the oxide becomes relatively small. The corrosion resistance of the stainless steel of Comparative Example 11 (4) and the poor machinability ^ [〇] / [B] ratio were too large. This is because 97111699 28 200900513 is less resistant to corrosion than the stainless steel of Example 12. This is because the amount of b is too high. Further, the stainless steel of Comparative Example 13 was inferior in machinability because the amount of A1 was too high. - Aspects due to the know-how! The composition of the stainless steel of 37 is optimized and heat treated by a fork in an appropriate temperature range, so that both corrosion resistance and machinability are excellent. Especially when the amount of oxygen exceeds 〇.(10), high machinability can be obtained regardless of the composition of other components. Further, the stainless steels of Examples 38 to 42 were further improved in comparison with other stainless steels. It is believed that this is due to the addition

Ca allows oxides having an acid salt structure of 11 which contributes to improved machinability to be more & 4. Evaluation (2) The composition of Example 1 was placed at 84 G i. Accept i heat treatment for 1 hour. The heat-treated samples were evaluated according to the same procedure as described above for the inclusion composition, the oxide area ratio 'corrosion resistance', the iron perforation property, the abrasion resistance value, and the chip breaking property. 5. Results (2) The results are shown in Table 5. When the heat treatment temperature is lower than "(10) ,, the machinability and corrosion resistance are poor. It is considered that this is due to insufficient production of oxide-based inclusions containing b and Cr and β formation-compounds. In addition, when heat treatment / When the m degree exceeds 1 300 C, the corrosion resistance is deteriorated. It is considered that the composition is partially uneven due to local melting, and on the other hand, at a temperature in the range of 1000 to 1300. When applying heat 97111699 29,513, it was found that it can improve the machinability without making the corrosion resistance [Table 5]

Equipment, beach environmental components, ships', components that can be used in marine phased plants, structural elements for hot water conversion of salt water, structural elements of seawater and light, mooring _ ^ cattle, submarine winding, submarine structural bridge standards Wires, brine pumps, shafts: colonies, electric nails at beach locations, and the like. "Ancient 70 pieces such as bolts, nuts and screws. In addition, according to the invention, the Wostian bolt, nut, round (four) „, #,:, easy knife stainless steel can be used for screwing, gears, pins, screws” , bearings, ribbons, sub-, drills, valves, sterns, m-blades, metal molds, industrial furnace components, chemical work stations: tools, nozzles, gaskets, rings, springs, food production equipment components, stone: :and;pharmaceutical components, food production components, waste incinerator components, bases, 1: armor components, petroleum refinery components, sub-furnace components, aircraft elements; ?::::: gas turbine components, nuclear, although the invention has been Detailed explanation 』==== Appearance order. The moon has not been separated from its spirit and scope and carried out 97111699 30 200900513 Various changes and modifications. This application is a Japanese patent application filed on March 31, 2007. Japanese Patent Application No. 2008-008886, filed on Jan. 18, 2008, the content of which is hereby incorporated by reference herein in 1 contained in the material obtained ΕΡΜΑ results debris. 9711169931

Claims (1)

200900513 十's patent application scope: h A Vostian iron-based easy-cut stainless steel, which comprises: C in weight percent, 0.500% or less; 〇. 01 to 5. 00% of Si; ' 〇. 01 to 10 00% of Μ; 5. 00 to 25.0% of Ni; 7. 50 to 30. 00% of Cr; f \ 0.300% or less of N; more than 〇.0100% but not more than 〇.1 〇〇〇%之〇; 〇. 0020 〇·1 000% of b; 0. 300% or less of A1; and the rest are Fe and unavoidable impurities, the steel system satisfies the following formula (〗): 0 68<[0]/[b]<2.50 (1) (where [0] indicates the content of bismuth and [B] indicates the content. 2) If the application is special (4) 丨 (4) Ming (4) material contains a B The oxide-based inclusions are dispersed therein. 3. In the case of the Vostian iron-based easy-cut stainless steel of the second item of the patent scope, the oxide-based inclusion further includes y. The Vostian Iron Free-cut Stainless Steel, as in the first application of the patent scope, 1 further comprises: 〃 at least one selected from the group consisting of sulfides, nitrides, carbon sulfides, and selenides. 97111699 32 2009 00513 In the second part of the patent scope, the Vostian iron-based easy-cut stainless steel, in which the == substance, nitride, carbon sulfide and - compound are grouped into the Wovenian iron-based easy-cut stainless steel of the third patent range. , where == substances, nitrides, carbon sulfides, the group consisting of the Vostian iron-based easy-cut stainless steel in the first item of the patent range, and = heat in the range of: 丨 _ to the tank Obtained from the clock to the 24-hour period. Red, please select the Worthian iron of the patent scope, the free-cut stainless steel, and heat-treat for 5 minutes to 24 hours within 1 day from 1st to 00th to 13th generation. Obtained during the period. 里传=1=The third item of the Vostian iron is easy-cut stainless steel, - to: from the hot zone to the 24-hour period from ^1 to 1.00. Obtained. For example, the Worthian iron is easy to cut into a 24-hour period; the heat treatment is 5 minutes, 4 seconds, and the scope of the patent is “Woistian Iron Easy Cut Stainless Steel” , clock to ^ Γ degree 1 000 to 13 〇 (rC within the range of heat treatment for 5 minutes to obtain. Please refer to the sixth item of the patent scope, the Vostian Iron System, which is easy to cut into non-mineral steel, 97111699 33 200900513 = obtained by the temperature of 1GGG 幻··c clock to 24 hours. 仃...Process 5 points and 13. For example, the Voss-Cheese stainless steel of any one of the patent scopes 1 to 12, one of the 夭stem iron series 0·01 to 〇.5〇% s, is free to choose: 0.01 to 0.50% of Se, 0·01 to 0.40% of Pb, 0.01 to 〇.40% of Bi, 〇. 01 to 0·40% of Te, 〇· 01 to 0. 40% of Sn, 〇_〇1 to 0.40% of p, 〇. 01 to 8. 〇〇% of m〇, 〇. 01 to 4· 〇〇% of the message, 〇.〇1 to 5.00% of Cu, 0·01 to 2.00% of Ti, 0.01 to 2.00% of v , 〇· 〇1 to 2. 〇〇% of Nb, 0. 01 to 2. 00% of zr, o.oool to 0.0100% of Mg, and 〇.0001 to 0.0100% of Ca consisting of at least One. 14. 00% of a Worthian iron-based stainless steel easy-to-cut stainless steel, comprising: a manufacturing method comprising: 97111699 34 200900513 0. 500% or less C, 0.01 to 5. 00% Si, 0. 01 to 10. 00% of Μ, 5. 00 to 25. 00% of Ni, ' 7. 50 to 30. 00% of Cr, ' 0. 300% or less of N, more than 0. 0100% but not more than 0. 1 000% of 0, 0. 0020 to 0. 1 000% of B, f 0. 300% or less of A1, and the rest are Fe and unavoidable impurities, the steel system is satisfied The following formula (1): 0. 68 < [0] / [B] < 2.50 (1) wherein [0] represents the content of 0 and [B] represents the content of B; melts and casts the steel; The steel is heat treated at a temperature in the range of 1000 to 1 300 ° C for a period of 5 minutes to 24 hours. 97111699 35