A Study on the Characterization of Mechanical Properties of Grade X80 High Strain Line Pipe Steel  

作　　者：Weihua Sun Shue Hu Guobao Li Hao Yu Lei Zhang Liwei Liu 

机构地区：[1]Shandong Iron and Steel Co.,Ltd,Jinan 250101,China [2]University of Science&Technology Beijing,Beijing 100083,China [3]Julong Steel Pipe Co.,Ltd,Nanjing 062658,China

出　　处：《材料科学研究（中英文版）》2015年第4期70-76,共7页Research of Materials Science

摘　　要：This paper introduces mechanical and metallurgical properties of 27mm thick Grade X80 high strain line pipe steel which aims at constructing long distance natural gas over permafrost and seismic areas.The steel is molybdenum and boron free.Dual phase of the X80 steel plates are regulated by thermal-mechanical controlled processing.The outer diameter of 1219mm pipes are manufactured by UOE process.DWTT toughness and longitudinal tensile properties including the Rt0.5/Rm,Rt1.5/Rt0.5 and Rt2.0/Rt1.0 are analyzed on both the plates and the pipes.Strain aging properties are also evaluated on the base material of the pipe,demonstrating that the pipe complies well with the pipeline construction requirements.Strengthening effects of precipitates are analyzed,revealing a 58.1MPa strengthening contribution by precipitates less than 20nm in size.Dislocation hardening is approximately 176MPa in the present studied steel.

关 键 词：High Strain Line Pipe Dual Phase Microstructure UNIFORM ELONGATION Precipitation DISLOCATION HARDENING 

分 类 号：TB[一般工业技术]