低成本高韧性X70管线钢的研制

Development of Low Cost and High Toughness X70 Pipeline Steel

文章介绍了采用Mo、Ni不同的成分体系设计,研制X70管线管的对比试验。试验结果显示两种方案的钢材组织都可获得多边形铁素体+针状铁素体+少量贝氏体,晶粒细小,钢材具有良好的低温冲击韧性和DWTT性能,钢材的拉伸性能和韧性指标完全满足高韧性X70管线钢的质量要求,含Ni的B方案性价比更高,可以组织批量生产。

This paper introduces the comparative test of X70 pipeline steel designed with different composition systems of Mo and Ni.The results show that polygonal ferrite,acicular ferrite and a small amount of bainite can be obtained in the two schemes.The steel has good low temperature impact toughness and DWTT properties.The tensile properties and toughness indexes of the steel can fully meet the quality requirements of high toughness X70 pipeline steel.Scheme B with Ni has higher cost performance ratio and can organize mass production.