Invention Grant
US09046029B2 Heat-resistant, ferritic cast steel having excellent melt flowability, gas defect resistance, toughness and machinability, and exhaust member made thereof
有权
具有优异的熔体流动性，耐气体缺陷性，韧性和可加工性的耐热的铁素体铸钢和由其制成的排气构件
- Patent Title: Heat-resistant, ferritic cast steel having excellent melt flowability, gas defect resistance, toughness and machinability, and exhaust member made thereof
- Patent Title (中): 具有优异的熔体流动性，耐气体缺陷性，韧性和可加工性的耐热的铁素体铸钢和由其制成的排气构件
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Application No.: US13877104Application Date: 2011-10-03
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Publication No.: US09046029B2Publication Date: 2015-06-02
- Inventor: Masahide Kawabata , Hideo Kuribayashi , Junji Hayakawa
- Applicant: Masahide Kawabata , Hideo Kuribayashi , Junji Hayakawa
- Applicant Address: JP Tokyo
- Assignee: HITACHI METALS, LTD.
- Current Assignee: HITACHI METALS, LTD.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2010-223366 20101001; JP2011-082167 20110401
- International Application: PCT/JP2011/072811 WO 20111003
- International Announcement: WO2012/043860 WO 20120405
- Main IPC: F01N13/16
- IPC: F01N13/16 ; C22C38/60 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/44 ; C22C38/48
Abstract:
A heat-resistant, ferritic cast steel having excellent melt flowability, gas defect resistance, toughness and machinability, which has a composition comprising by mass, C: 0.32-0.45%, Si: 0.85% or less, Mn: 0.15-2%, Ni: 1.5% or less, Cr: 16-23%, Nb: 3.2-4.5%, Nb/C: 9-11.5, N: 0.15% or less, S: (Nb/20−0.1) to 0.2%, W and/or Mo: 3.2% or less in total (W+Mo), the balance being Fe and inevitable impurities, and a structure in which the area ratio of a eutectic (δ+NbC) phase of δ ferrite and Nb carbide (NbC) is 60-80%, and the area ratio of manganese chromium sulfide (MnCr)S is 0.2-1.2%, and an exhaust member made thereof.
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