Invention Grant
- Patent Title: Low alloy steel for geothermal power generation turbine rotor, and low alloy material for geothermal power generation turbine rotor and method for manufacturing the same
- Patent Title (中): 地热发电用转子用低合金钢，地热发电用转子用低合金材料及其制造方法
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Application No.: US13448770Application Date: 2012-04-17
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Publication No.: US09034121B2Publication Date: 2015-05-19
- Inventor: Satoru Ohsaki , Kazuhiro Miki , Tsukasa Azuma , Koji Kajikawa , Shigeru Suzuki , Masayuki Yamada , Itaru Murakami , Kenichi Okuno , Liang Yan , Reki Takaku , Akihiro Taniguchi , Tetsuya Yamanaka , Makoto Takahashi , Kenichi Imai , Osamu Watanabe , Joji Kaneko
- Applicant: Satoru Ohsaki , Kazuhiro Miki , Tsukasa Azuma , Koji Kajikawa , Shigeru Suzuki , Masayuki Yamada , Itaru Murakami , Kenichi Okuno , Liang Yan , Reki Takaku , Akihiro Taniguchi , Tetsuya Yamanaka , Makoto Takahashi , Kenichi Imai , Osamu Watanabe , Joji Kaneko
- Applicant Address: JP Tokyo JP Tokyo
- Assignee: THE JAPAN STEEL WORKS,LTD.,KABUSHIKI KAISHA TOSHIBA
- Current Assignee: THE JAPAN STEEL WORKS,LTD.,KABUSHIKI KAISHA TOSHIBA
- Current Assignee Address: JP Tokyo JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2011-092340 20110418
- Main IPC: C22C38/46
- IPC: C22C38/46 ; C21D6/00 ; C22C38/58 ; C22C38/44 ; C21D7/13 ; C21D1/25 ; C21D1/28
Abstract:
A low alloy steel ingot contains from 0.15 to 0.30% of C, from 0.03 to 0.2% of Si, from 0.5 to 2.0% of Mn, from 0.1 to 1.3% of Ni, from 1.5 to 3.5% of Cr, from 0.1 to 1.0% of Mo, and more than 0.15 to 0.35% of V, and optionally Ni, with a balance being Fe and unavoidable impurities. Performing quality heat treatment including a quenching step and a tempering step to the low alloy steel ingot to obtain a material, which has a grain size number of from 3 to 7 and is free from pro-eutectoid ferrite in a metallographic structure thereof, and which has a tensile strength of from 760 to 860 MPa and a fracture appearance transition temperature of not higher than 40° C.
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