公开(公告)号：US10392683B2

公开(公告)日：2019-08-27

申请号：US15117458

申请日：2015-02-25

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Taizo Makino ,  Yukiteru Takeshita ,  Naomitsu Mizui ,  Yutaka Wakasu

IPC: C21D1/28 ,  C21D8/00 ,  C21D9/28 ,  B60B35/00 ,  B60B35/02 ,  B60B35/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/28 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/50

Abstract: Provided is a rail vehicle axle having an excellent fatigue limit and notch factor. A rail vehicle axle according to the present embodiment has a chemical composition consisting of, in mass %, C: 0.20 to 0.35%, Si: 0.20 to 0.65%, Mn: 0.40 to 1.20%, P: 0.020% or less, S: 0.020% or less, Cu: 0 to 0.30%, Ni: 0 to 0.30%, Cr: 0 to 0.30%, Mo: 0 to 0.08%, Al: 0 to 0.100%, N: 0.0200% or less, V: 0 to 0.060%, and Ti: 0 to 0.020%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2): 0.58≤C+Si/8+Mn/5+Cu/10+Cr/4+V≤0.67  (1) Si+0.9Cr≥0.50  (2) where, each element symbol in Formulae (1) and (2) is substituted by the content (mass %) of a corresponding element.

公开(公告)号：US12000028B2

公开(公告)日：2024-06-04

申请号：US15751020

申请日：2016-08-17

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Taizo Makino ,  Takayuki Kamimura ,  Yuichiro Yamamoto ,  Yutaka Wakasu ,  Kiyonobu Sugae ,  Yukiteru Takeshita ,  Naomitsu Mizui

IPC: C22C38/50 ,  B61F5/50 ,  C21D1/28 ,  C21D6/00 ,  C21D8/06 ,  C21D9/08 ,  C21D9/28 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  F16C3/02

CPC classification number: C22C38/50 ,  B61F5/50 ,  C21D1/28 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/065 ,  C21D9/08 ,  C21D9/28 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  F16C3/02 ,  F16C2204/62 ,  F16C2326/10

Abstract: Provided is a rail vehicle axle having an excellent fatigue limit and notch factor. A rail vehicle axle according to the present embodiment has a chemical composition consisting of, in mass %, C: 0.20 to 0.35%, Si: 0.20 to 0.65%, Mn: 0.40 to 1.20%, P: 0.020% or less, S: 0.020% or less, Sn: 0.07 to 0.40%, N: 0.0200% or less, Cu: 0 to 0.30%, Ni: 0 to 0.30%, Cr: 0 to 0.30%, Mo: 0 to 0.08%, Al: 0 to 0.100%, V: 0 to 0.060%, and Ti: 0 to 0.020%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2):

0.58≤C+Si/8+Mn/5+Cu/10+Cr/4+V≤0.67  (1)

Si+0.9Cr≥0.50  (2)



where, each element symbol in Formulae (1) and (2) is substituted by the content (mass %) of a corresponding element.

公开(公告)号：US10435761B2

公开(公告)日：2019-10-08

申请号：US14893355

申请日：2014-06-06

Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION

Inventor： Shinichiro Tabata ,  Kazuo Hikida ,  Nobusato Kojima ,  Naomitsu Mizui

IPC: C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/24 ,  C22C38/28 ,  C22C38/32 ,  C22C38/48 ,  C22C38/54 ,  C21D8/02 ,  C21D1/84 ,  C21D6/00 ,  C22C38/22 ,  C22C38/26 ,  C22C38/38 ,  C22C38/50 ,  C21D8/04

Abstract: A heat-treated steel material includes: a chemical composition expressed by, in mass %: C: 0.16% to 0.38%; Mn: 0.6% to 1.5%; Cr: 0.4% to 2.0%; Ti: 0.01% to 0.10%; B: 0.001% to 0.010%; Si: 0.20% or less; P: 0.05% or less; S: 0.05% or less; N: 0.01% or less; Ni: 0% to 2.0%; Cu: 0% to 1.0%; Mo: 0% to 1.0%; V: 0% to 1.0%; Al: 0% to 1.0%; Nb: 0% to 1.0%; REM: 0% to 0.1%; and the balance: Fe and impurities; and a structure expressed by: retained austenite: 1.5 volume % or less; and the balance: martensite.