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公开(公告)号：JP2013221203A
公开(公告)日：2013-10-28
申请号：JP2012095035
申请日：2012-04-18
申请人： Dowa Thermotech Kk , Dowaサーモテック株式会社 , Honda Motor Co Ltd , 本田技研工業株式会社 , Nippon Steel & Sumitomo Metal Corp , 新日鐵住金株式会社
发明人： SHIMIZU YUICHIRO , KOBAYASHI ATSUSHI , MAEDA SUSUMU , KANAYAMA MASAO , IMATAKA HIDEKI , SUKETANI MASAHITO , GYOTOKU YUYA , AKIMOTO KIYOTAKA
CPC分类号： C23C8/26 , C21D1/06 , C21D1/76 , C21D6/02 , C21D9/28 , C21D9/32 , C21D2201/05 , C21D2211/004 , C21D2221/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , F16H55/06
摘要： PROBLEM TO BE SOLVED: To provide a high-strength and low-strain nitrided steel member which has high pitching resistance and high bending fatigue strength, and has lower strain than carburization treatment or carbonitrided treatment.SOLUTION: In a nitrided steel member, an iron nitrided compound layer is formed on a surface of a steel member having the prescribed components. The strength ratio to be expressed by the formula IFeN(111)/{IFeN(111)+IFeN(111)} is ≥0.5, where IFeN(111) denotes the X-ray diffraction peak intensity of the (111) crystal plane of FeN, and IFeN(111) denotes the X-ray diffraction peak intensity of the (111) crystal plane of FeN, which are measured on the surface of the nitrided steel member by the X-ray diffraction. The Vickers hardness of the iron nitrided compound layer is ≤900, the Vickers hardness of a base material immediately below the iron nitrided compound layer is ≥700, the difference between the Vickers hardness of the iron nitrided compound layer and the Vickers hardness of the base material is ≤150, and the thickness of the iron nitrided compound layer is 2-17 μm.
摘要翻译： 要解决的问题：提供具有高俯仰阻力和高弯曲疲劳强度的高强度低应变氮化钢构件，并且比渗碳处理或碳氮共处理具有较低的应变。解决方案：在氮化钢构件中，将铁 氮化复合层形成在具有规定成分的钢构件的表面上。 由式IFeN（111）/ {IFeN（111）+ IFeN（111）}表示的强度比≥0.5，其中，IFeN（111）表示（111）晶面的X射线衍射峰强度 FeN和IFeN（111）表示通过X射线衍射在氮化钢构件的表面上测量的FeN的（111）晶面的X射线衍射峰强度。 铁氮化复合层的维氏硬度≤900，铁渗氮化合物层正下方的基材的维氏硬度≥70，铁渗氮化合物层的维氏硬度与基体的维氏硬度之差 材料≤150，铁氮化合物层的厚度为2-17μm。
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公开(公告)号：JP2013159794A
公开(公告)日：2013-08-19
申请号：JP2012020631
申请日：2012-02-02
发明人： HORIMOTO MASAYUKI , IMATAKA HIDEKI , GYOTOKU YUYA , USUI YUSUKE
摘要： PROBLEM TO BE SOLVED: To provide a rolled steel for cold forging/nitriding, capable of being subjected to cold forging without performing heat treatment beforehand, having reduced surface roughness after cold forging, having excellent machinability after cold forging and capable of imparting high core part hardness to a component subjected to cold forging and nitriding.SOLUTION: A rolled steel for cold forging/nitriding has a chemical composition including 0.06 to 0.15% C, 0.02 to 0.35% Si, 0.10 to 0.90% Mn, ≤0.030% S, 0.50 to 2.0% Cr, 0.10 to 0.50% V and 0.010 to 0.090% Al, and the balance Fe with impurities; wherein P, N and O in the impurities satisfy P≤0.030%, N≤0.0080% and O≤0.0030%, and 5.0≤35(C+N)+5(Si+Mn)+Cr+3(Cu+Ni)+4(Mo+V)≤10.0 and 1.8≤{V+(9/20)Mo}/C≤9.0 is satisfied. The rolled steel for cold forging/nitriding has a microstructure of ferrite-pearlite structure, in which the average grain size of the ferrite is ≤50 μmn.
摘要翻译： 要解决的问题：为了提供一种用于冷锻/氮化的轧制钢，能够预先进行热锻处理而进行冷锻，冷锻后的表面粗糙度降低，冷锻后的切削加工性优异，能够赋予高芯部 对于冷锻和氮化的部件的硬度。解决方案：用于冷锻/氮化的轧制钢具有包括0.06至0.15％的C，0.02至0.35％的Si，0.10至0.90％的Mn，≤0.030％的S，0.50的化学组成 至2.0％Cr，0.10〜0.50％V和0.010〜0.090％Al，余量为Fe与杂质; 其中杂质中的P，N和O满足P≤0.030％，N≤0.0080％，O≤0.0030％，5.0≤35（C + N）+5（Si + Mn）+ Cr + 3（Cu + Ni） +4（Mo + V）≤10.0和1.8≤{V +（9/20）Mo}/C≤9.0。 用于冷锻/氮化的轧制钢具有铁素体 - 珠光体组织的微观结构，其中铁素体的平均晶粒尺寸≤50μmn。
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公开(公告)号：JP2013018999A
公开(公告)日：2013-01-31
申请号：JP2011150821
申请日：2011-07-07
发明人： GYOTOKU YUYA , HORIMOTO MASAYUKI , IMATAKA HIDEKI , USUI YUSUKE
摘要： PROBLEM TO BE SOLVED: To provide steel for cold forging and nitriding which is excellent in cold forging characteristic and machinability after cold forging, and is capable of imparting a high core-part hardness, a high surface hardness, and a large effective depth of a hardened layer, to a cold-forged and nitrided component.SOLUTION: The steel for cold forging and nitriding, contains 0.01 to 0.15% of C, 0.35% or less of Si, 0.10 to 0.90% of Mn, 0.030% or less of P, 0.030% or less of S, 0.50 to 2.0% of Cr, 0.10 to 0.50% of V, 0.01 to 0.10% of Al, 0.0080% or less of N, and 0.0030% or less of O with the balance being Fe and impurities, and has a chemical composition that satisfies the following formulae; [399×C+26×Si+123×Mn+30×Cr+32×Mo+19×V≤160], [20≤(669.3×logC-1959.6×logN-6983.3)×(0.067×Mo+0.147×V)≤80], [140×Cr+125×Al+235×V≥160], and [90≤511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V≤170]. The metal structure of the steel is a mixed structure comprised of ferrite and a carbide, wherein the carbide has a particle diameter of 3.0 μm or less, a mean aspect ratio of not greater than 5.0, and an area ratio of from 0.2 to 8.0% occupying in the matrix structure.
摘要翻译： 待解决的问题：为了提供冷锻锻造特性和冷锻后的切削加工性优异的冷锻氮化用钢，能够赋予芯部硬度高，表面硬度高，效率高 硬化层的深度，冷锻和氮化组分。 ＆lt; P＆gt;解决方案：用于冷锻和氮化的钢包含C：0.03〜0.15％，Si：0.35％以下，Mn：0.10〜0.90％，P：0.030％以下，S：0.030％ 至2.0％的Cr，0.10〜0.50％的V，0.01〜0.10％的Al，0.0080％以下的N和0.0030％以下的O，余量为Fe和杂质，其化学成分满足 以下公式; [399×C + 26×Si + 123×Mn + 30×Cr + 32×Mo + 19×V≤160]，[20≤（669.3×log
e 1959.6×log e N-6983.3）×（0.067×Mo + 0.147×V）≤80]，[140×Cr + 125×Al + 235×V≥160] 和[90≤511×C + 33×Mn + 56×Cu + 15×Ni + 36×Cr + 5×Mo + 134×V≤170]。 钢的金属结构是由铁素体和碳化物组成的混合结构体，其中碳化物的粒径为3.0μm以下，平均纵横比为5.0以下，面积比为0.2〜8.0％ 占据矩阵结构。 版权所有（C）2013，JPO＆INPIT -
公开(公告)号：JP2013227606A
公开(公告)日：2013-11-07
申请号：JP2012099332
申请日：2012-04-25
CPC分类号： C22C38/50 , C21D1/06 , C21D6/002 , C21D8/06 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/28 , C22C38/40 , C22C38/42
摘要： PROBLEM TO BE SOLVED: To provide a case hardening steel material which exhibits low component cost, has excellent hot workability and machinability, and can ensure excellent bending fatigue strength and wear resistance of a carburized part.SOLUTION: A case hardening steel material contains, by mass, 0.15 to 0.23% of C, 0.01 to 0.15% of Si, 0.65 to 0.90% of Mn, 0.010 to 0.030% of S, 1.65 to 1.80% of Cr, 0.015 to 0.060% of Al, 0.0100 to 0.0250% of N, and the balance Fe with impurities, and satisfies [25≤Mn/S≤85], [0.90≤Cr/(Si+2Mn)≤1.20], and [1.16Si+0.70Mn+Cr≥2.20], wherein the contents of P, Ti and O as impurities satisfy P≤0.020%, Ti≤0.005% and O≤0.0015%, respectively. The steel material has a structure that comprises 20 to 70% of ferrite in area fraction with the remainder being pearlite and/or bainite. Further, the steel material may contain a prescribed amount of Cu and Ni.
摘要翻译： 要解决的问题：提供一种表现出低成本，具有优异的热加工性和机械加工性的表面硬化钢材料，并且可以确保渗碳部件具有优异的弯曲疲劳强度和耐磨性。解决方案：表面硬化钢材料包含 质量，C：0.15〜0.23％，Si：0.01〜0.15％，Mn：0.65〜0.90％，S：0.010〜0.030％，Cr：1.65〜1.80％，Al：0.015〜0.060％，N：0.01〜0.0250％ ，余量为Fe的杂质，满足[25≤Mn/S≤85]，[0.90≤Cr/（Si + 2Mn）≤1.20]和[1.16Si + 0.70Mn +Cr≥2.20]，其中， 的P，Ti和O作为杂质，分别满足P≤0.020％，Ti≤0.005％和O≤0.0015％。 钢材具有以面积分数计20％至70％的铁素体，其余为珠光体和/或贝氏体的结构。 此外，钢材可以含有规定量的Cu和Ni。
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5.发明专利Steel for cold forging/nitriding, steel material for cold forging/nitriding, and cold-forged/nitrided component 有权用于冷锻/除氮的钢，用于冷锻/氮化的钢材，以及冷锻/氮化组分
公开(公告)号：JP2013213254A
公开(公告)日：2013-10-17
申请号：JP2012083609
申请日：2012-04-02
发明人： IMATAKA HIDEKI , HORIMOTO MASAYUKI , GYOTOKU YUYA , TANAKA KOSUKE
CPC分类号： C22C38/60 , C21D7/02 , C21D9/0075 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/46 , C22C38/50 , C22C38/58 , C23C8/02 , C23C8/26 , C23C8/50
摘要： PROBLEM TO BE SOLVED: To provide a steel for cold forging/nitriding which has excellent cold forgeability, exhibits excellent cutting chip precessability after cold-forging, and can impart high core hardness, high surface hardness and deep effective cured layer depth to a cold-forged and nitrided component.SOLUTION: A steel for cold forging/nitriding contains, by mass, 0.10-0.15% C, ≥0.02- 0.90-2.50% Mn, ≤0.030% P, ≤0.050% S, 0.80-2.0% Cr, 0.05-0.50% V, 0.01-0.07% Al, ≤0.0080% N, ≤0.0030% O, and the balance Fe with impurities. The steel has a chemical composition satisfying the following formulas: [35≤Mn/S≤200]; [20≤(669.3×logC-1959.6×logN-6983.3)×(0.067×Mo+0.147×V)≤80]; [140×Cr+125×Al+235×V≥160]; and [150≤511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V≤200]. In place of a part of Fe, the steel optionally contains a specific amount of at least one element selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb.
摘要翻译： 要解决的问题：为了提供一种具有优异的冷锻性的冷锻/氮化用钢，在冷锻后具有优异的切削加工性，并且能够赋予冷硬化强度高的铁芯硬度，高表面硬度和深度有效的固化层深度， 锻造和氮化组分。解决方案：用于冷锻/氮化的钢含有质量为0.10-0.15％C，≥0.02-<0.10％Si，> 0.90-2.50％Mn，≤0.030％P，≤0.050％S， 0.80-2.0％Cr，0.05-0.50％V，0.01-0.07％Al，≤0.0080％N，≤0.0030％O，余量为Fe与杂质。 钢的化学成分满足下式：[35≤Mn/S≤200]; [20≤（669.3×logC-1959.6×logN-6983.3）×（0.067×Mo + 0.147×V）≤80]; [140×Cr + 125×Al + 235×V≥160]; 和[150≤511×C + 33×Mn + 56×Cu + 15×Ni + 36×Cr + 5×Mo + 134×V≤200]。 代替Fe的一部分，钢任选地含有特定量的选自Mo，Cu，Ni，Ti，Nb，Zr，Pb，Ca，Bi，Te，Se和Sb中的至少一种元素。
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公开(公告)号：JP2013194301A
公开(公告)日：2013-09-30
申请号：JP2012064740
申请日：2012-03-22
发明人： GYOTOKU YUYA , HORIMOTO MASAYUKI , IMATAKA HIDEKI , TANAKA KOSUKE
CPC分类号： B32B15/18 , C21D1/06 , C21D9/32 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/40 , C22C38/42 , C22C38/46 , C22C38/50 , C22C38/60 , C23C8/26 , C23C8/32 , C23C8/38 , C23C8/50 , Y02P10/212
摘要： PROBLEM TO BE SOLVED: To provide a steel material for nitriding, excellent in machinability, particularly in chip treatability, and capable of giving a nitrided component high core hardness, high surface hardness, and a large effective hardened layer depth.SOLUTION: A steel material for nitriding has a chemical composition consisting of: >0.15-0.35% C, ≤0.20% Si, 0.10-2.0% Mn, ≤0.030% P, ≤0.050% S, 0.80-2.0% Cr, 0.10-0.50% V, 0.01-0.06% Al, ≤0.0080% N, ≤0.0030% O, and the balance Fe with impurities, and satisfies relations of: [20≤(669.3×logC-1959.6×logN-6983.3)×(0.067×Mo+0.147×V)≤80] and [140×Cr+125×Al+235×V≥160]. The structure of the steel material for nitriding includes ferrite-perlite, ferrite-bainite, or ferrite-perlite-bainite, the area ratio of ferrite in the structure is ≥20%, and the V content in the precipitate in extraction residue analysis is ≤0.10%. One or more selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se, and Sb in specific amounts may be contained in place of a part of Fe.
摘要翻译： 要解决的问题：提供一种氮化用钢材，特别是切屑处理性优异，能够赋予氮化成分高的铁心硬度，高表面硬度和大的有效硬化层深度。解决方案：钢材 氮化的化学组成为：> 0.15-0.35％C，≤0.20％Si，0.10-2.0％Mn，≤0.030％P，≤0.050％S，0.80-2.0％Cr，0.10-0.50％V，0.01 -0.06％Al，≤0.0080％N，≤0.0030％O，余量为Fe与杂质，满足关系：[20≤（669.3×logC-1959.6×logN-6983.3）×（0.067×Mo + 0.147×V ）≤80]和[140×Cr + 125×Al + 235×V≥160]。 用于氮化的钢材的结构包括铁素体珍珠岩，铁素体贝氏体或铁素体 - 珍珠岩 - 贝氏体，结构中铁素体的面积比≥20％，萃取残渣分析中的析出物的V含量≤ 0.10％。 Fe，Cu，Ni，Ti，Nb，Zr，Pb，Ca，Bi，Te，Se和Sb中的一种或多种可以包含一部分Fe。
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7.发明专利
公开(公告)号：JP2013185186A
公开(公告)日：2013-09-19
申请号：JP2012049929
申请日：2012-03-07
发明人： TANAKA KOSUKE , HORIMOTO MASAYUKI , IMATAKA HIDEKI , GYOTOKU YUYA
摘要： PROBLEM TO BE SOLVED: To provide a cold forging and nitriding steel which is excellent in cold forgeability and machinability after cold forging, and is capable of providing a cold forged and nitrided component with high core part hardness, high surface hardness and a deep effective hardened layer depth.SOLUTION: A cold forging and nitriding steel has a chemical composition that contains, by mass, 0.01-0.15% C, less than 0.10% Si, 0.10-0.50% Mn, 0.030% or less P, 0.050% or less S, 0.80-2.0% Cr, 0.03% or more and less than 0.10% V, 0.01-0.10% Al, 0.0080% or less N, and 0.0030% or less O with the balance being Fe and impurities, and satisfies [399×C+26×Si+123×Mn+30×Cr+32×Mo+19×V≤160], [20≤(669.3×logC-1959.6×logN-6983.3)×(0.067×Mo+0.147×V)≤80] and [140×Cr+125×Al+235×V≥160]. Instead of some of Fe, a specific amount of one or more elements among Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb may be contained.
摘要翻译： 要解决的问题：提供一种在冷锻后具有优异的冷锻性和可加工性的冷锻锻造氮化钢，并且能够提供具有高芯部硬度，高表面硬度和深度有效硬化的冷锻和氮化组分 层压深度。冷轧锻造和氮化钢的化学成分含有质量分数为0.01-0.15％，小于0.10％的Si，0.10-0.50％的Mn，0.030％以下的P，0.050％以下的S ，0.80-2.0％Cr，0.03％以上且小于0.10％的V，0.01-0.10％的Al，0.0080％以下的N和0.0030％以下的O，余量为Fe和杂质，满足[399×C + 26×Si + 123×Mn + 30×Cr + 32×Mo + 19×V≤160]，[20≤（669.3×logC-1959.6×logN-6983.3）×（0.067×Mo + 0.147×V）≤80 ]和[140×Cr + 125×Al + 235×V≥160]。 可以含有Mo，Cu，Ni，Ti，Nb，Zr，Pb，Ca，Bi，Te，Se和Sb中的一种或多种元素代替Fe的一部分。
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公开(公告)号：JP2013108144A
公开(公告)日：2013-06-06
申请号：JP2011255350
申请日：2011-11-22
摘要： PROBLEM TO BE SOLVED: To provide a rolled steel bar or wire rod for hot forging, which has high bending fatigue strength, contact fatigue strength and machinability, and in which heat treatment strain can be reduced.SOLUTION: The rolled steel bar or wire rod for hot forging comprises, by mass%, 0.10 to 0.25% C, 0.01 to 0.10% Si, 0.50 to 1.00% Mn, 0.003 to 0.050% S, 1.60 to 2.00% Cr, ≤0.10% (including 0%) Mo, 0.025 to 0.050% Al, 0.0100 to 0.0250% N, and the balance being Fe and impurities, and fn defined by formula (1): fn=Cr+2×Mo is 1.82 to 2.10. Further, the differential value between the maximum value and the minimum value is ≤10 in Ms values defined by formula (2): Ms=550-361×C-39×Mn-20×Cr-5×Mo at a plurality of measurement positions C1-C17 in the cross-section CS of the steel bar or wire rod having a radius R.
摘要翻译： 要解决的问题：提供一种具有高弯曲疲劳强度，接触疲劳强度和切削性的热锻的轧制钢筋或线材，并且可以降低热处理应变。 解决方案：用于热锻的轧制钢棒或线材以质量％计含有0.10至0.25％的C，0.01至0.10％的Si，0.50至1.00％的Mn，0.003至0.050％的S，1.60至2.00％的Cr ，≤0.10％（包括0％）Mo，0.025〜0.050％Al，0.0100〜0.0250％N，余量为Fe和杂质，fn由式（1）定义：fn = Cr + 2×Mo为1.82〜 2.10。 此外，由公式（2）定义的Ms值中的最大值和最小值之间的微分值为≤10：多个测量时的Ms = 550-361×C-39×Mn-20×Cr-5×Mo 钢筋或线材的横截面CS中的位置C1-C17为半径R.版权所有（C）2013，JPO＆INPIT
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公开(公告)号：JP2013019001A
公开(公告)日：2013-01-31
申请号：JP2011150857
申请日：2011-07-07
发明人： IMATAKA HIDEKI , HORIMOTO MASAYUKI , USUI YUSUKE , GYOTOKU YUYA
CPC分类号： Y02P10/212
摘要： PROBLEM TO BE SOLVED: To provide steel for cold forging and nitriding which is excellent in cold forging characteristic and machinability after cold forging, and is capable of imparting high core-part hardness, high surface hardness, and a large effective depth of a hardened layer, to a cold-forged and nitrided component.SOLUTION: The steel material for cold forging and nitriding, contains 0.01 to 0.15% of C, 0.35% or less of Si, 0.10 to 0.90% of Mn, 0.030% or less of P, 0.030% or less of S, 0.50 to 2.0% of Cr, 0.10 to 0.50% of V, 0.01 to 0.10% of Al, 0.0080% or less of N, and 0.0030% or less of O with the balance being Fe and impurities, and has a chemical composition that satisfies the following formulae; [399×C+26×Si+123×Mn+30×Cr+32×Mo+19×V≤160], [20≤(669.3×logC-1959.6×logN-6983.3)×(0.067×Mo+0.147×V)≤80], [140×Cr+125×Al+235×V≥160], and [90≤511×C+33×Mn+56×Cu+15×Ni+36×Cr+5×Mo+134×V≤170]. The steel material has a metal structure comprised of a ferrite-bainite structure or a ferrite-perlite-bainite structure, wherein the area ratio of bainite is more than 30% and 95% or less and the vanadium content in the precipitate in extraction residue analysis is 0.10% or less.
摘要翻译： 待解决的问题：为了提供冷锻锻造特性和冷锻后的切削加工性优异的冷锻氮化用钢，能够赋予芯部硬度高，表面硬度高，有效深度大 硬化层，冷锻和氮化组分。 ＆lt; P＆gt;解决方案：用于冷锻和氮化的钢材包含C：0.03〜0.15％，Si：0.35％以下，Mn：0.10〜0.90％，P：0.030％以下，S：0.030％ Cr：0.50〜2.0％，V：0.10〜0.50％，Al：0.01〜0.10％，N：0.0080％以下，O：0.0030％以下，余量为Fe和杂质，化学组成满足 以下公式; [399×C + 26×Si + 123×Mn + 30×Cr + 32×Mo + 19×V≤160]，[20≤（669.3×log
e 1959.6×log e N-6983.3）×（0.067×Mo + 0.147×V）≤80]，[140×Cr + 125×Al + 235×V≥160] 和[90≤511×C + 33×Mn + 56×Cu + 15×Ni + 36×Cr + 5×Mo + 134×V≤170]。 钢材具有由铁素体贝氏体组织或铁素体 - 珍珠岩 - 贝氏体组织构成的金属结构，其中贝氏体的面积比大于30％和95％以下，提取残渣分析中的析出物中的钒含量 为0.10％以下。 版权所有（C）2013，JPO＆INPIT -
公开(公告)号：JP2015042766A
公开(公告)日：2015-03-05
申请号：JP2013174281
申请日：2013-08-26
摘要： 【課題】浸炭部品に、JISで規定されたSCM420Hを素材鋼とする場合と同程度以上の良好な曲げ疲労強度とピッチング強度を確保させることができ、成分コストが低く、熱間および冷間での良好な加工性も具備する肌焼鋼鋼材の提供。【解決手段】C:0.10〜0.24%、Si:0.16〜0.35%、Mn:0.40〜0.94%、S:0.005〜0.050%、Cr:1.65〜1.90%、Al:0.015〜0.060%、N:0.0130〜0.0250%と、残部がFe及び不純物とからなり、〔15≦̸Mn/S≦̸150〕、〔0.75≦̸Cr/(Si+2Mn)≦̸1.40〕及び〔0.30≦̸Si?Cr≦̸0.65〕で、不純物中のP≦̸0.020%、Ti≦̸0.005%及びO≦̸0.0020%であり、熱間加工ままの硬さがHV300以下である肌焼鋼鋼材。Feの一部に代えて、Cu≦̸0.20%、Ni≦̸0.20%、Mo≦̸0.03%、V≦̸0.20%、Nb≦̸0..060%、Ca≦̸0.0050%から選択される1種以上を含有してもよい。【選択図】なし
摘要翻译： 要解决的问题：为了提供可以确保与渗碳部件中JIS规定的SCM420H相比或更好的疲劳强度和俯仰强度的表面硬化钢材料，成分低，成本低，冷加工性好。 ：表面硬化钢材包括C：0.10-0.24％，Si：0.16-0.35％，Mn：0.40-0.94％，S：0.005-0.050％，Cr：1.65-1.90％，Al：0.015-0.060％ -0.0250％的N和剩余的Fe和杂质，[15≤Mn/S≤150]，[0.75≤Cr/（Si + 2Mn）≤1.40]和[0.30≤Si×Cr≤0.65]。 杂质含有P≤0.020％，Ti≤0.005％，O≤0.0020％。 表面硬化钢材的热轧后的硬度为HV300以下，可以含有Cu≤0.20％，Ni≤0.20％，Mo≤0.03％，V≤0.20％，Nb≤0.060％中的一种以上， 和Ca≤0.0050％，而不是Fe的一部分。
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