Steel for nitriding and nitrided part
    1.
    发明授权
    Steel for nitriding and nitrided part 有权
    用于氮化和氮化部分的钢

    公开(公告)号:US08876988B2

    公开(公告)日:2014-11-04

    申请号:US13702285

    申请日:2011-11-17

    摘要: The present invention provides a steel for nitriding with a composition including, by mass %: C: 0.10% to 0.20%; Si: 0.01% to 0.7%; Mn: 0.2% to 2.0%; Cr: 0.2% to 2.5%; Al: 0.01% to less than 0.19%; V: over 0.2% to 1.0%; Mo: 0% to 0.54%; N: 0.001% to 0.01%; P limited to not more than 0.05%; S limited to not less than 0.2%; and a balance including Fe and inevitable impurities, the composition satisfying 2≦[V]/[C]≦10, where [V] is an amount of V by mass % and [C] is an amount of C by mass %, in which the steel for nitriding has a microstructure containing bainite of 50% or more in terms of an area percentage.

    摘要翻译: 本发明提供一种氮化组成的钢,其含有质量%:C:0.10〜0.20% Si:0.01〜0.7% Mn:0.2〜2.0% Cr:0.2〜2.5% Al:0.01%〜小于0.19%; V:超过0.2%至1.0%; Mo:0〜0.54% N:0.001〜0.01% P限制在不超过0.05%; S限制在0.2%以上; 余量包括Fe和不可避免的杂质,组成满足2≦̸ [V] / [C]≦̸ 10,其中[V]为质量%V,[C]为质量% 其中用于氮化的钢具有以面积百分比计含有贝氏体为50%以上的微结构。

    STEEL FOR NITRIDING AND NITRIDED PART
    2.
    发明申请
    STEEL FOR NITRIDING AND NITRIDED PART 有权
    用于硝化和硝化部分的钢

    公开(公告)号:US20130087250A1

    公开(公告)日:2013-04-11

    申请号:US13702285

    申请日:2011-11-17

    摘要: The present invention provides a steel for nitriding with a composition including, by mass %: C: 0.10% to 0.20%; Si: 0.01% to 0.7%; Mn: 0.2% to 2.0%; Cr: 0.2% to 2.5%; Al: 0.01% to less than 0.19%; V: over 0.2% to 1.0%; Mo: 0% to 0.54%; N: 0.001% to 0.01%; P limited to not more than 0.05%; S limited to not less than 0.2%; and a balance including Fe and inevitable impurities, the composition satisfying 2≦[V]/[C]≦10, where [V] is an amount of V by mass % and [C] is an amount of C by mass %, in which the steel for nitriding has a microstructure containing bainite of 50% or more in terms of an area percentage.

    摘要翻译: 本发明提供一种氮化组成的钢,其含有质量%:C:0.10〜0.20% Si:0.01〜0.7% Mn:0.2〜2.0% Cr:0.2〜2.5% Al:0.01%〜小于0.19%; V:超过0.2%至1.0%; Mo:0〜0.54% N:0.001〜0.01% P限制在不超过0.05%; S限制在0.2%以上; 余量包括Fe和不可避免的杂质,组成满足2≦̸ [V] / [C]≦̸ 10,其中[V]为质量%V,[C]为质量% 其中用于氮化的钢具有以面积百分比计含有贝氏体为50%以上的微结构。

    HIGH STRENGTH STEEL MATERIAL AND HIGH STRENGTH BOLT EXCELLENT IN DELAYED FRACTURE RESISTANCE AND METHODS OF PRODUCTION OF SAME
    5.
    发明申请
    HIGH STRENGTH STEEL MATERIAL AND HIGH STRENGTH BOLT EXCELLENT IN DELAYED FRACTURE RESISTANCE AND METHODS OF PRODUCTION OF SAME 审中-公开
    高强度钢材和高强度螺栓在延迟断裂韧性方面的优势及其生产方法

    公开(公告)号:US20120247618A1

    公开(公告)日:2012-10-04

    申请号:US13515444

    申请日:2011-03-11

    IPC分类号: C23C8/26

    摘要: A high strength steel material which is excellent in delayed fracture resistance containing, by mass %, C: 0.10 to 0.55%, Si: 0.01 to 3%, and Mn: 0.1 to 2%, further containing one or both of V: 1.5% or less and Mo: 3.0% or less, the contents of V and Mo satisfying V+1/2Mo>0.4%, further containing one or more of Cr: 0.05 to 1.5%, Nb: 0.001 to 0.05%, Cu: 0.01 to 4%, Ni: 0.01 to 4%, and B: 0.0001 to 0.005%, and having a balance of Fe and unavoidable impurities, the structure being a mainly tempered martensite structure, the surface of the steel material being formed with (a) a nitrided layer having a thickness from the surface of the steel material of 200 μm or more and a nitrogen concentration of 12.0 mass % or less and higher than the nitrogen concentration of the steel material by 0.02 mass % or more and (b) a low carbon region having a depth from the surface of the steel material of 100 μm or more to 1000 μm or less and having a carbon concentration of 0.05 mass % or more and 0.9 time or less the carbon concentration of the steel material.

    摘要翻译: 一种耐延迟断裂性优异的高强度钢材,以质量%计含有C:0.10〜0.55%,Si:0.01〜3%,Mn:0.1〜2%,进一步含有V:1.5% 以下,Mo:3.0%以下,V和Mo的含量满足V + 1 / 2Mo> 0.4%,进一步含有Cr:0.05〜1.5%,Nb:0.001〜0.05%,Cu:0.01〜 4%,Ni:0.01〜4%,B:0.0001〜0.005%,余量为Fe和不可避免的杂质,其结构为主要是回火马氏体组织,钢材表面形成有(a) 氮化层的钢板表面的厚度为200μm以上,氮浓度为12.0质量%以下,高于钢材的氮浓度为0.02质量%以上,(b)低碳 具有从钢材表面的深度为100μm以上至1000μm以下且碳浓度为0.05质量%以上且0.9t以下的区域 ime或更少的钢材料的碳浓度。

    DRAWN HEAT TREATED STEEL WIRE FOR HIGH STRENGTH SPRING USE AND PRE-DRAWN STEEL WIRE FOR HIGH STRENGTH SPRING USE
    8.
    发明申请
    DRAWN HEAT TREATED STEEL WIRE FOR HIGH STRENGTH SPRING USE AND PRE-DRAWN STEEL WIRE FOR HIGH STRENGTH SPRING USE 审中-公开
    用于高强度弹簧使用的热处理钢丝和用于高强度弹簧使用的预制钢丝

    公开(公告)号:US20120291927A1

    公开(公告)日:2012-11-22

    申请号:US13574175

    申请日:2011-07-05

    摘要: Drawn heat treated steel wire for high strength spring use is provided containing, by mass %, C: 0.67% to less than 0.9%, Si: 2.0 to 3.5%, Mn: 0.5 to 1.2%, Cr: 1.3 to 2.5%, N: 0.003 to 0.007%, and Al: 0.0005% to 0.003%, having Si and Cr satisfying the following formula: 0.3%≦Si−Cr≦1.2%, and having a balance of iron and unavoidable impurities, having as impurities, P: 0.025% or less and S: 0.025% or less, furthermore having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm, further having, as a metal structure, at least residual austenite in a volume rate of over 6% to 15%, having a prior austenite grain size number of #10 or more, and having a circle equivalent diameter of undissolved spherical carbides of less than 0.2 μm.

    摘要翻译: 提供了用于高强度弹簧使用的拉丝热处理钢丝,以质量%计含有C:0.67%至小于0.9%,Si:2.0-3.5%,Mn:0.5-1.2%,Cr:1.3-2.5%,N :0.003〜0.007%,Al:0.0005〜0.003%,Si和Cr满足下​​式:0.3%≦̸ Si-Cr≦̸ 1.2%,余量为铁和不可避免的杂质,杂质为P :0.025%以下,S:0.025%以下,还具有小于0.2μm的未溶解球形碳化物的当量圆直径,作为金属结构,至少残留奥氏体的体积率超过6%以上〜 15%,具有#10以上的前奥氏体晶粒数,并且具有小于0.2μm的未溶解球形碳化物的圆当量直径。