利索-全球专利检索

  1. 登录
  2. 注册
发明授权
US08951365B2 High strength steel and high strength bolt excellent in delayed fracture resistance and methods of production of same 有权
高强度钢和高强度螺栓具有优异的耐延迟断裂性及其制造方法

High strength steel and high strength bolt excellent in delayed fracture resistance and methods of production of same
摘要：
A steel 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 more of Cr: 0.05 to 1.5%, V: 0.05 to 0.2%, Mo: 0.05 to 0.4%, 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 being formed with (a) a nitrided layer having a certain thickness range and a nitrogen concentration higher than the nitrogen concentration of the steel by 0.02 mass % or more and (b) a low carbon region having a certain depth range from the surface of the steel and having a carbon concentration of 0.9 time or less the carbon concentration of the steel.
摘要（中）：

C：0.10〜0.55％，Si：0.01〜3％，Mn：0.1〜2％，进一步含有Cr：0.05〜1.5％中的一种或多种， V：0.05〜0.2％，Mo：0.05〜0.4％，Nb：0.001〜0.05％，Cu：0.01〜4％，Ni：0.01〜4％，B：0.0001〜0.005％ 不可避免的杂质，该结构是主要回火的马氏体结构，钢的表面形成有（a）具有一定厚度范围和氮浓度高于钢的氮浓度的氮化物浓度为0.02质量％以上， （b）具有与钢表面一定深度范围并且碳浓度为钢的碳浓度为0.9倍以下的低碳区域。

公开/授权文献
信息查询
Espacenet
0/0