发明名称 |
Heat resistant cast steel, manufacturing method thereof, cast parts of steam turbine, and manufacturing method of cast parts of steam turbine |
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. |
申请公布号 |
US9284633(B2) |
申请公布日期 |
2016.03.15 |
申请号 |
US201113336402 |
申请日期 |
2011.12.23 |
申请人 |
KABUSHIKI KAISHA TOSHIBA;THE JAPAN STEEL WORKS, LTD. |
发明人 |
Yamada Masayuki;Takaku Reki;Ohnishi Haruki;Okuno Kenichi;Imai Kenichi;Tanaka Shinji;Miki Kazuhiro |
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 |
主分类号 |
C21D8/00 |
代理机构 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. A method of manufacturing a heat resistant cast steel comprising, in percent by mass, C: 0.05-0.15, Si: 0.03-0.2, Mn: 0.1-1.5, Ni: 0.1-1, Cr: 8-8.7, Mo: 0.2-1.5, V: 0.1-0.3, Co: 2.7-5, W: 0.1-5, N: 0.005-0.03, Nb: 0.01-0.2, B: 0.004-0.015, Ti: 0.01-0.1, and Fe, the method comprising:
melting raw materials, refining and degassing the melted raw materials, pouring the melted raw materials into a predetermined mold to form a shape, performing an annealing treatment at a temperature of 1000 to 1150° C., cooling the annealed raw materials at a cooling rate of 20 to 60° C./hour, performing a normalizing treatment at a temperature of 1000 to 1200° C., cooling the normalized raw materials at a cooling rate of 100 to 600° C./hour in a center part of the heat resistant cast steel, performing a first stage tempering treatment at a temperature of 500 to 700° C., cooling the first-stage tempered raw materials at a cooling rate of 40 to 100° C./hour in the center part of the heat resistant cast steel, performing a second stage tempering treatment at a temperature of 700 to 780° C., and cooling the second-stage tempered raw materials at a cooling rate of 20 to 60° C./hour. |
地址 |
Tokyo JP |