公开(公告)号：US20140105753A1

公开(公告)日：2014-04-17

申请号：US14050946

申请日：2013-10-10

Applicant: Hitachi, Ltd.

Inventor： Shinji OIKAWA ,  Hideo YODA ,  Masahiko ARAI ,  Hiroyuki DOI

IPC: F01D5/28

CPC classification number: F01D5/28 ,  C21D1/18 ,  C21D1/26 ,  C21D6/004 ,  C21D9/0068 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/06 ,  C22C38/44

Abstract: A precipitation hardening martensitic stainless steel is provided with excellent mechanical property and corrosion resistance and contains, by mass, 0.1% or less of C; 0.1% or less of N; 10.0%˜15.0% of Cr; 10.0%˜15.0% of Ni; 0.5%˜2.5% of Mo; 1.0%˜3.0% of Al; 1.0% or less of Si; 1.0% or less of Mn, and the rest is Fe and inevitable impurities. A steam turbine long blade is made of the precipitation hardening martensitic stainless steel.

Abstract translation: 沉淀硬化马氏体不锈钢具有优异的机械性能和耐腐蚀性，并且质量含有0.1％以下的C; 0.1％以下的N; 10.0％〜15.0％Cr; 10.0％〜15.0％的Ni; 0.5％〜2.5％的Mo; 1.0％〜3.0％的Al; 1.0％以下的Si; 1.0％以下的Mn，其余为Fe和不可避免的杂质。 蒸汽轮机长叶片由沉淀硬化马氏体不锈钢制成。

公开(公告)号：US20130186106A1

公开(公告)日：2013-07-25

申请号：US13741946

申请日：2013-01-15

Applicant: Hitachi, Ltd.

Inventor： Shinji OIKAWA ,  Hideo YODA ,  Masahiko ARAI ,  Hiroyuki DOI

IPC: F01D5/28

CPC classification number: F01D5/28 ,  C21D6/004 ,  C21D6/02 ,  C21D7/13 ,  C21D9/0068 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/50 ,  C22C38/52 ,  F05D2230/72 ,  F05D2300/171

Abstract: The problem to be solved of the present invention is to provide a precipitation hardening martensitic stainless steel having excellent tissue stability, strength, toughness, and corrosion-resistance, requiring no sub-zero treatment, and having excellent productivity; and also a steam turbine long blade using the same. The problem is solved by providing a precipitation hardening martensitic stainless steel containing, by mass, 0.1% or less of C; 0.1% or less of N; 9.0% or more and 14.0% or less of Cr; 9.0% or more and 14.0% or less of Ni; 0.5% or more and 2.5% or less of Mo; 0.5% or less of Si; 1.0% or less of Mn; 0.25% or more and 1.75% or less of Ti; 0.25% or more and 1.75% or less of Al, and the rest is Fe and inevitable impurities; and a steam turbine long blade using the precipitation hardening martensitic stainless steel.

Abstract translation: 本发明要解决的问题是提供一种具有优异的组织稳定性，强度，韧性和耐腐蚀性的沉淀硬化马氏体不锈钢，不需要次零处理，并且具有优异的生产率; 以及使用其的汽轮机长叶片。 通过提供含有0.1质量％以下的C的沉淀硬化马氏体不锈钢来解决问题， 0.1％以下的N; 9.0％以上且14.0％以下的Cr; 9.0％以上，14.0％以下的Ni; 0.5％以上且2.5％以下的Mo; 0.5％以下的Si; 1.0％以下的Mn; 0.25％以上且1.75％以下的Ti; 0.25％以上且1.75％以下的Al，其余为Fe和不可避免的杂质; 和蒸汽轮机长叶片使用沉淀硬化马氏体不锈钢。

公开(公告)号：US20130224033A1

公开(公告)日：2013-08-29

申请号：US13777373

申请日：2013-02-26

Applicant: Hitachi, Ltd.

Inventor： Masahiko ARAI ,  Hiroyuki DOI ,  Shinji OIKAWA ,  Kenichi MURATA

IPC: F01D5/28

CPC classification number: F01D5/28 ,  F05D2220/31

Abstract: There is provided a steam turbine rotor with high reliability and corresponding to increase in length of a high strength steel blade, in which only a low-pressure last stage is highly strengthened. The steam turbine rotor includes a steam turbine low-pressure last stage long blade made of a precipitation hardening type martensitic stainless steel containing, in mass, 0.1% or less of C, 0.1% or less of N, 9.0% to 14.0% inclusive of Cr, 9.0% to 14.0% inclusive of Ni, 0.5% to 2.5% inclusive of Mo, 0.5% or less of Si, 1.0% or less of Mn, 0.25% to 1.75% inclusive of Ti, 0.25% to 1.75% inclusive of Al, and the balance consisting of Fe and inevitable impurities, and a disk having a specific alloy composition is joined to a last stage section of the turbine rotor made of a low-alloy steel.

Abstract translation: 提供了一种高可靠性的蒸汽轮机转子，对应于高强度钢叶片的长度增加，其中只有低压最后阶段被高度强化。 蒸汽轮机转子包括由沉淀硬化型马氏体不锈钢制成的汽轮机低压末级长刀片，其质量为0.1％以下的C，0.1％以下的N，9.0％〜14.0％，包括 Cr，9.0〜14.0％的Ni，0.5〜2.5％的Mo，0.5％以下的Si，1.0％以下的Mn，0.25〜1.75％的Ti，0.25〜1.75％ Al，余量由Fe和不可避免的杂质构成，具有特定合金组成的盘与由低合金钢构成的涡轮转子的最后段连接。