Research on Microstructure and Mechanical Properties of HTP X80 Pipeline Steel
The microstructure and mechanical properties of HTP pipeline steel X80 were tested which was produced in industry through controlled rolling and cooling. The results show that the yield strength of pipeline steel X80 had reached above 600MPa , and the ratio of tensile strength to yield strength was 0.87, and ductile-brittle transition temperature was lower than - 60℃, and the good strength and toughness were obtained. Low content of P, S, high content of Mn and fine microstructure had good effect on reducing the ductile-brittle transition temperature. Two different precipitations were observed in pipeline steel X80, and the large ones were mainly Nb, Ti (CN) with size rang 50nm to 0.2 μm, and the small ones were mainly NbC with size lower than 30nm. Remarkable strengthening of the tested steel is due to the grain refinement and these nano-precipitations.
pipeline steel X80 acicular ferrite ductile-brittle temperature
YI Hai-long ZHOU Min DU Lin-xiu WANG Guo-dong
State Key Laboratory of Rolling Technology & Automation,Northeastern University,Shenyang 110004,China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
135-138
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）