Cracking Analysis on X80 Steel Oil Pipe during JCOE Forming
摘 要
在JCOE成型过程中一根X80输油钢管母材发生纵向开裂, 裂纹长度达到了700 mm。通过化学成分分析、力学性能测试、断口分析及金相检验等方法分析了钢管的开裂原因。结果表明: 大尺寸外来非金属夹杂物的存在导致了钢板在连铸或轧制过程中产生裂纹。而较低的断裂韧度为裂纹进一步扩展创造了条件, 在成型拉应力的作用下微裂纹扩展并延伸。
Abstract
One X80 steel oil pipe experienced longitudinal cracking during JCOE forming, and the crack length was getting up to 700 mm. The cracking reason was analyzed by means of chemical composition analysis, mechanical properties testing, fracture analysis and metallographic examination. The results showed that the primal crack resulted in pipe cracking during forming, and steel plate near the crack possessed low fracture toughness, which accelerated crack propagating under tension stress of forming. The existence of non-metal inclusions of big size was responsible for the generation of primal crack.
中图分类号 TG115 TE973
所属栏目 质量控制与失效分析
基金项目
收稿日期 2009/11/13
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备注杜 伟(1982-),男,助理工程师。
引用该论文: DU Wei,LOU Qi,CHANG Rong-ling. Cracking Analysis on X80 Steel Oil Pipe during JCOE Forming[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2010, 46(11): 715~718
杜伟,娄琦,常荣玲. JCOE成型的X80输油钢管开裂分析[J]. 理化检验-物理分册, 2010, 46(11): 715~718
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参考文献
【1】Q/SY GJX 104-2009油气输送管道工程站场用钢管技术条件[S].
【2】杨云清, 陈洁翰. 铸板坯纵向开裂成因分析[J]. 厚板, 2009, 15(2): 4-8.
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【2】杨云清, 陈洁翰. 铸板坯纵向开裂成因分析[J]. 厚板, 2009, 15(2): 4-8.
【3】曾强国. 低碳钢高速线材的表面缺陷及冷镦开裂原因分析[J]. 2005, 41(2): 69-75.
【4】GB/T 10561-2005钢中非金属夹杂物含量的测定标准评级图显微检验法[S].
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