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通过对管线钢在不同温度、不同应力状态下拉伸试验,研究了温度及应力 状态对层状撕裂的影响。初步研究发现,对由连铸然后经控制轧制生产的管线钢层 状撕裂几乎总是沿中心线偏析带发生。室温下层状撕裂机制很可能为微孔聚集型。 低温下则可能沿偏析带产生脆性开裂。消除或减轻中心线偏析程度是解决层状撕裂的关键。
Through the tensile test of pipeline steel under different temperature and different stress conditions, the influence of temperature and stress state on layered tearing was studied. Preliminary studies have found that stratified tearing of pipeline steel produced by continuous casting and then controlled rolling occurs almost always along the centerline segregation zone. The lamellar tearing mechanism at room temperature is likely to be microporous aggregates. Low temperatures may cause brittle cracking along the segregation zone. Eliminating or mitigating the degree of centerline segregation is the key to solving layered tearing.