STEEL MATERIAL FOR HIGHLY DEFORMABLE LINE PIPES HAVING SUPERIOR STRAIN AGING RESISTANCE AND SUPERIOR HIC RESISTANCE, METHOD FOR MANUFACTURING SAME, AND WELDED STEEL PIPE

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专利权人:

JFE STEEL CORPORATION

发明人:

YASUDA Kyono,MIZUNO Daisuke,NAKAMICHI Haruo,ISHIKAWA Nobuyuki

申请号：

US201515300980

公开号：

US2017022590(A1)

申请日:

2015.03.26

申请国别(地区):

美国

年份:

2017

代理人:

摘要：

A steel material for highly deformable line pipes that has superior strain aging resistance, superior HIC resistance, and a metallographic structure composed mainly of ferrite and bainite. The total area fraction of the ferrite and the bainite is 90% or more, and the difference in hardness between the ferrite and the bainite is 70 or more in terms of Vickers hardness. Additionally, the steel material has a uniform elongation of 9% or more and a yield ratio of 90% or less both before a strain aging treatment at a temperature of 300° C. or lower and after the strain aging treatment.

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中国工程科技知识中心

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http://www.ckcest.cn/home/