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公开(公告)号：EP1681359A4
公开(公告)日：2009-03-11
申请号：EP04772713
申请日：2004-08-27
Applicant: NAT INST FOR MATERIALS SCIENCE
Inventor： OHBA TOSHIO , SAWADA KOTA , KIMURA KAZUHIRO , OKADA HIROKAZU , ABE FUJIO
IPC: C21D9/00 , C21D1/18 , C21D1/28 , C21D6/00 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/18 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/30 , C22C38/32 , C22C38/54 , F01D25/24 , F02C7/00
CPC classification number: C22C38/02 , C21D1/18 , C21D1/28 , C21D6/002 , C21D9/0093 , C22C38/04 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/30 , C22C38/32 , F01D25/243
Abstract: A high temperature bolt material, characterized in that it is a ferrite steel comprising 8 wt % or more of Cr and having a tempered martensite structure and can be used in a high temperature region of higher than 500°C; and a method for producing the high temperature bolt material which comprises subjecting the above-mentioned steel material to a heat treatment comprising a quenching or normalizing at a temperature of 1000°C or higher and then to a tempering at a temperature of 730°C or higher. The above ferrite steel high temperature bolt material is excellent in characteristics of the resistance to stress relaxation.
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公开(公告)号：EP1621643A4
公开(公告)日：2009-04-01
申请号：EP04724727
申请日：2004-03-31
Inventor： TABUCHI MASAAKI , OKADA HIROKAZU , KONDO MASAYUKI , TSUKAMOTO SUSUMU , ABE FUJIO
Abstract: A welded joint of a tempered martensite based heat-resistant steel, characterized in that the fine grain portion in the weld heat-affected zone of a heat-resistant steel having a tempered martensite structure exhibits a creep strength of 90 % or more of the creep strength of the base metal thereof. The welded joint is inhibited in the formation of the HAZ fine grain portion exhibiting a significantly reduced creep strength.
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