API钢级套管螺纹断裂失效分析  

Frcature Failure Analysis of API Connection Casing

作　　者：张旭[1] 扈立[1] 李恒政[1] 王正[1] 黄蓓蓓[1] 

机构地区：[1]天津钢管集团股份有限公司,天津300301

出　　处：《四川冶金》2016年第3期63-67,58,共6页Sichuan Metallurgy

摘　　要：针对API N80-1LC扣型公端螺纹在使用过程中发生断裂失效的问题,通过宏观观察、化学成分分析,金相宏观观察,SEM微观观察,力学性能测试,韧脆转变温度计算,有限元计算对失效套管原因进行分析。结果表明:套管材料在低温下呈现低温脆性,套管内表面局部应力集中,在其作用下,套管发生脆性断裂。The fracture failure of API N80--1 LC casing occurred in the using process. According to visual examination, the chemical composition analysis, metallographic observation, SEM observation, mechanical property test, ductile brittle transition temperature calculation, finite element calculation for the failure of N80-1 LC casing. The results show that the casing material presents low temperature brittleness at low temperature, and the stress concentration in the inner surface of the casing causes brittle fracture.

关 键 词：套管 螺纹 断裂 裂纹 

分 类 号：TG115[金属学及工艺—物理冶金]