发明授权
- 专利标题： Heat resistant cast steel, manufacturing method thereof, cast parts of steam turbine, and manufacturing method of cast parts of steam turbine
- 专利标题（中）： 耐热铸钢及其制造方法，蒸汽轮机的铸件，蒸汽轮机的铸件的制造方法
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申请号： US13336402申请日： 2011-12-23
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公开(公告)号： US09284633B2公开(公告)日： 2016-03-15
- 发明人: Masayuki Yamada , Reki Takaku , Haruki Ohnishi , Kenichi Okuno , Kenichi Imai , Shinji Tanaka , Kazuhiro Miki
- 申请人： Masayuki Yamada , Reki Takaku , Haruki Ohnishi , Kenichi Okuno , Kenichi Imai , Shinji Tanaka , Kazuhiro Miki
- 申请人地址： JP Tokyo JP Tokyo
- 专利权人： KABUSHIKI KAISHA TOSHIBA,THE JAPAN STEEL WORKS, LTD.
- 当前专利权人： KABUSHIKI KAISHA TOSHIBA,THE JAPAN STEEL WORKS, LTD.
- 当前专利权人地址： JP Tokyo JP Tokyo
- 代理机构： Oblon, McClelland, Maier & Neustadt, L.L.P.
- 优先权： JPP2010-293315 20101228
- 主分类号： C21D8/00
- IPC分类号： C21D8/00 ; C22C38/02 ; C21D1/26 ; C21D1/28 ; C21D6/00 ; C22C38/00 ; C22C38/04 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50 ; C22C38/52 ; C22C38/54 ; C21D9/00 ; C21D9/50
摘要：
A heat resistant cast steel containing, in mass %, C: 0.05-0.15, Si: 0.03-0.2, Mn: 0.1-1.5, Ni: 0.1-1, Cr: 8-10.5, Mo: 0.2-1.5, V: 0.1-0.3, Co: 0.1-5, W: 0.1-5, N: 0.005-0.03, Nb: 0.01-0.2, B: 0.002-0.015, Ti: 0.01-0.1, Fe and unavoidable impurities. A method for manufacturing a heat resistant cast steel, the method including melting raw materials to obtain a molten metal, refining and degassing the molten metal, pouring the molten metal into a predetermined mold to form a shape, performing an annealing treatment at a temperature of 1000 to 1150° C., performing a normalizing treatment at a temperature of 1000 to 1200° C., performing a first stage tempering treatment at a temperature of 500 to 700° C., and performing a second stage tempering treatment at a temperature of 700 to 780° C.
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