“低成本”X80管线钢工艺及力学性能  

Technological Process and Mechanical Properties of Low-Cost X80 Pipeline Steel

作　　者：肖宝亮[1] 许云波[1] 王国栋[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第6期829-832,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50504007);"十一五"国家科技支撑计划项目(2007BAE51B07)

摘　　要：利用TMCP技术实现了管线钢X70级向X80级的升级,并研究了板材的力学性能及断口分离现象.结果表明:对于不同方向的拉伸性能,板状试样得到的强度均比圆棒试样大,并且随着卷取温度的升高,圆棒试样的屈服强度呈先增后减的趋势;各工艺-20℃的冲击功AkV(-20℃)均在310 J以上,韧脆转变温度均在-100℃以下;分析系列冲击载荷-位移曲线得出,随着温度的降低,冲击功降低,最大载荷增大.另外,由冲击断口的能谱分析结果得出,冲击断口附近主要以Al的氧化物、MnS等第二相粒子为主.The pipeline steel was updated from X70 to X80 through TMCP technique, and its mechanical properties and fracture separation of rolled plate were studied. The results showed that both the longitudinal and transverse tensile strengths of strip specimen are better than those of round bar specimen, and the yield strength of round bar specimen increases first then decreases with increasing coiling temperature. All the values of the work done by impact Akv at - 20 ℃ are above 310 J, and all DBTTs are below - 100℃. With a series of impact load-displacement curves analyzed, the work done by impact decreases and peak load increases with decreasing testing temperature. Furthermore, as shown by energy spectrometric analysis of impact fracture, the second-phase particles in the vicinity of the fracture surface are mainly of alumina and manganese sulfide.

关 键 词：TMCP 卷取温度 示波冲击实验 断口分离 管线钢 

分 类 号：TG335.11[金属学及工艺—金属压力加工]