Alloy design,processing,microstructure and properties of plate steels for use in API 5L X80 -120 large diameter,high pressure pipelines

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• 作者：Xiaojun LiangMingjian HuaAnthony J Deardo
• 会议时间：2013-06-01
• 关键词：high pressure pipelines ; alloy design ; plate steels ; processing ; microstructure ; properties ; bainite ; MA microconstituent ; interrupted direct quenching ; FATT ; carbon partitioning ; reverse austenite
• 作者单位：Basic Metals Processing Research Institute,Department of Mechanical Engineering and Materials Science,University of Pittsburgh,Pittsburgh,PA 15261,USA
• 母体文献：第五届宝钢学术年会论文集
• 会议名称：第五届宝钢学术年会
• 会议地点：上海
• 主办单位：中国金属学会
• 语种：chi

摘要

The revenue produced by a pipeline depends on the rate that the fluid can be pumped along its length.It has been recognized for some time that the benefit-to-cost ratio increases with strength level.In this regard,the strength of high pressure pipeline steels has doubled in 40 years,from X60 in 1970 to approaching X120 today.The alloy design,rolling and cooling of plates for X100 + pipe applications will be presented and discussed.The metallurgy of attaining the strength and ductility while reducing brittle fracture by cleavage and increasing the ductile fracture crack arresting potential of these new steels will also be discussed.In this paper a low carbon steel of C.E.0.50 and Pcm of 0.21 was subjected to a TMCP simulation on a computer controlled laboratory mill.After rolling,the steel was immediately IDQ to various water - end temperatures followed by air cooling to RT.The resulting microstructure was a mixture of various types of bainite and MA microconstituent.The effect of processing on microstructure was assessed,and the tensile and CVN properties were determined and correlated to the final microstructure.