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公开(公告)号：EP3222743A1
公开(公告)日：2017-09-27
申请号：EP15860856.2
申请日：2015-11-13
发明人： MATSUI Naoki , NEISHI Yutaka , CHIDA Tetsushi , OBATA Akihisa , HORI Shoji , CHIBA Keisuke
CPC分类号： C22C38/54 , B21B1/16 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/06 , C21D8/065 , C21D9/525 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/50
摘要： In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn] ×[Cr] and Y2 represented by Y2=0.134×(D/25.4-(0.50×√[C]))/(0.50×√[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater.
摘要翻译： 在具有规定的化学成分的冷锻成分用轧制棒材或轧制线材中，Y1 = [Mn]×[Cr]，Y2 = 0.134×（D / 25.4-（0.50×√ [C]））/（0.50×√[C]）满足Y1> Y2时，抗拉强度为750MPa以下，内部组织为铁素体 - 珠光体组织，内部组织中的铁素体分率为40％或 更大。
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公开(公告)号：EP3222742B1
公开(公告)日：2019-05-29
申请号：EP15860759.8
申请日：2015-11-13
发明人： MATSUI Naoki , NEISHI Yutaka , CHIDA Tetsushi , OBATA Akihisa , HORI Shoji , CHIBA Keisuke
IPC分类号： C22C38/00 , B21B1/16 , C22C38/32 , C22C38/54 , C21D8/06 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/26 , C22C38/28 , C22C38/20 , C22C38/22 , C22C38/24 , C21D9/52 , C22C38/48 , C22C38/50 , C22C38/42 , C21D6/00
CPC分类号： C21D9/525 , B21B1/16 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/06 , C21D8/065 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/48 , C22C38/50 , C22C38/54
摘要： In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn] ×[Cr] and Y2 represented by Y2=0.134×(D/25.4-(0.50׈š[C]))/(0.50׈š[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater. AMOUNT IS 0.30%
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公开(公告)号：EP3222746A1
公开(公告)日：2017-09-27
申请号：EP16761816.4
申请日：2016-03-10
发明人： KUBOTA Manabu , BANNO Koichi , CHIBA Keisuke , SEKI Ryuuichi
CPC分类号： C21D8/06 , C21D9/52 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/18 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/40 , C22C38/58 , F16F1/02
摘要： Steel for a suspension spring including, as a chemical composition, by % by mass: C: more than 0.40% and 0.65% or less; Si: 1.00% to 3.50%; Mn: more than 2.00% and 3.00% or less; Cr: 0.01% to 2.00%; V: 0.02% to 0.50%; P: 0.020% or less; S: 0.020% or less: N: 0.0100% or less; and a remainder of Fe and impurities, in which Kf is 280 or more, in which a structure contains a tempered martensite of which an area ratio is 90% or more, in which a Fe-based carbide precipitated in the tempered martensite is a cementite, and in which an average of an area ratios of prior austenite grains which stretch in a longitudinal direction of the steel and of which an aspect ratio exceeds 3.0, is 80% or more in a case of depths of 0.1 mm, 0.2 mm, and 0.3 mm in a sheet thickness direction from a surface of the steel.
摘要翻译： 以质量％计含有C：超过0.40％且0.65％以下的化学组成的悬挂弹簧用钢， Si：1.00％至3.50％; Mn：超过2.00％且3.00％以下; Cr：0.01〜2.00％ V：0.02％至0.50％; P：0.020％以下; S：0.020％以下：N：0.0100％以下; 剩余的Fe和杂质，其中Kf为280或更高，其中组织含有面积比为90％或更高的回火马氏体，其中在回火马氏体中析出的Fe基碳化物是渗碳体 ，并且其中在深度为0.1mm，0.2mm和0.1mm的情况下，沿钢的纵向方向延伸并且纵横比超过3.0的原奥氏体晶粒的面积比的平均值为80％以上， 从钢的表面沿板厚方向为0.3mm。
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公开(公告)号：EP3222742A1
公开(公告)日：2017-09-27
申请号：EP15860759.8
申请日：2015-11-13
发明人： MATSUI Naoki , NEISHI Yutaka , CHIDA Tetsushi , OBATA Akihisa , HORI Shoji , CHIBA Keisuke
CPC分类号： C21D9/525 , B21B1/16 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/06 , C21D8/065 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42 , C22C38/48 , C22C38/50 , C22C38/54
摘要： In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn] ×[Cr] and Y2 represented by Y2=0.134×(D/25.4-(0.50×√[C]))/(0.50×√[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater. AMOUNT IS 0.30%
摘要翻译： 在具有规定的化学成分的冷锻成分用轧制棒材或轧制线材中，Y1 = [Mn]×[Cr]，Y2 = 0.134×（D / 25.4-（0.50×√ [C]））/（0.50×√[C]）满足Y1> Y2时，抗拉强度为750MPa以下，内部组织为铁素体 - 珠光体组织，内部组织中的铁素体分率为40％或 更大。 金额为0.30％
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