公开(公告)号：US20170073785A1

公开(公告)日：2017-03-16

申请号：US15123076

申请日：2015-03-03

申请人： DAIDO STEEL CO., LTD. ,  DENSO CORPORATION

发明人： Yuuki TANAKA ,  Makoto HARITANI ,  Takahiro MIYAZAKI ,  Kouji MORITA ,  Yoshihiro TANIMURA ,  Toshimasa ITO ,  Tadashi NISHIWAKI ,  Tomomitsu FUKUOKA

IPC分类号： C21D6/00 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/00 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/60 ,  C22C38/46

摘要： The present invention provides an age hardening type bainitic microalloyed steel having a composition which includes, in terms of mass %: 0.06-0.35% of C; 0.01-2.00% of Si; 0.10-3.00% of Mn; 0.001-0.200% of S; 0.001-2.00% of Cu; 0.40-3.00% of Ni; 0.10-3.00% of Cr; 0.10-1.00% of Mo; 0.10-1.00% of V; and 0.001-0.100% of s-Al, with the remainder being Fe and unavoidable impurities, and which satisfies a value of the following expression (1) to be 20 or larger and a value of the following expression (2) to be 0.82 or larger: 3×[C]+10×[Mn]+2×[Cu]+2×[Ni]+12×[Cr]+9×[Mo]+2×[V]  expression (1); 1.66×[C]+0.18×[Si]+0.27×[Mn]+0.09×[Ni]+0.32×[Cr]+0.34×[Mo]+0.44×[V]  expression (2), in which each [ ] in the expression (1) and the expression dicates a content of the element shown therein in terms of mass %.

摘要翻译： 其中表达式（1）中的每个[]和表达式以质量％表示其中所示的元素的含量。

公开(公告)号：US20180245172A1

公开(公告)日：2018-08-30

申请号：US15558963

申请日：2016-03-16

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION ,  DENSO CORPORATION

发明人： Masato YUYA ,  Motoki TAKASUGA ,  Taizo MAKINO ,  Masashi HIGASHIDA ,  Tatsuya HASEGAWA ,  Kouji MORITA ,  Toshimasa ITO ,  Tomomitsu FUKUOKA ,  Tadashi NISHIWAKI ,  Yoshihiro TANIMURA

IPC分类号： C21D8/00 ,  C21D6/00 ,  C21D1/18 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC分类号： C21D8/005 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D6/02 ,  C21D8/065 ,  C21D9/0068 ,  C21D9/525 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： Age hardenable steel is low in hardness after hot forging, providing a machine part with the desired fatigue strength and yield strength by aging treatment, and high in toughness after aging treatment, comprising C: 0.09 to 0.20%, Si: 0.01 to 0.40%, Mn: 1.5 to 2.5%, S: 0.001 to 0.045%, Cr: over 1.00% to 2.00%, Al: 0.001 to 0.060%, V: 0.22 to 0.55%, N: over 0.0080 to 0.0170%, and a balance of Fe and impurities, where an area rate of bainite structures is 80% or more, an effective V ratio (amount of dissolved V/total amount of V) is 0.9 or more, a P and Ti in the impurities is P: 0.03% or less and Ti: less than 0.005%, and the chemical composition is one where the following F1 is 1.00 or less and the F2 is 0.30 or more: F1=C+0.1×Si+0.2×Mn+0.15×Cr+0.35×V F2=−4.5×C+Mn+Cr−3.5×V