发明名称 |
Precipitation-hardened, martensitic, cast stainless steel having excellent machinability and its production method |
摘要 |
Precipitation-hardened, martensitic, cast stainless steel having a composition comprising, by mass, 0.08-0.18% of C, 1.5% or less of Si, 2.0% or less of Mn, 0.005-0.4% of S, 13.5-16.5% of Cr, 3.0-5.5% of Ni, 0.5-2.8% of Cu, 1.0-2.0% of Nb, and 0.12% or less of N, the amounts of C, N and Nb meeting the condition of −0.2≦9 (C %+0.86N %)−Nb %≦1.0, the rest being Fe and inevitable impurities, and having a structure in which Cu precipitates having an average particle size of 0.1-0.4 μm are dispersed in a tempered-martensite-based matrix. |
申请公布号 |
US9169543(B2) |
申请公布日期 |
2015.10.27 |
申请号 |
US200812532351 |
申请日期 |
2008.03.21 |
申请人 |
HITACHI METALS, LTD. |
发明人 |
Kawabata Masahide;Endo Seiichi;Hara Masanori;Otsuka Koki |
分类号 |
C22C38/42;C22C38/48;C21D6/00;C21D6/02;C21D1/25 |
主分类号 |
C22C38/42 |
代理机构 |
Sughrue Mion, PLLC |
代理人 |
Sughrue Mion, PLLC |
主权项 |
1. A precipitation-hardened, martensitic, cast stainless steel having excellent machinability, which has a composition consisting of, by mass, 0.10-0.18% of C, 1.5% or less of Si, 2.0% or less of Mn, 0.05-0.4% of S, 13.5-16.5% of Cr, 3.0-5.0% of Ni, 0.5-2.8% of Cu, 1.3-2.0% of Nb, and 0.12% or less of N, the amounts of C, N and Nb meeting the condition of −0.2≦9 (C %+0.86N %)−Nb %≦1.0, the rest being Fe and inevitable impurities; the structure of said cast stainless steel having Cu precipitates having an average particle size of 0.1-0.4 μm dispersed in a tempered-martensite-based matrix. |
地址 |
Tokyo JP |