X80级管线钢的组织和力学性能

Structure and Mechanical Properties of Linepipe Steel X80

对成分(%)为:0.04C,1.87Mn,0.27Mo,0.06Nb,0.006V,0.017Ti的X80级管线钢进行了组织和冲击韧性、强度试验,并与X70级管线钢进行对比。试验结果表明,当X80钢的组织为针状铁素体和细小弥散的贝氏体时,该钢有较好的强韧性,抗拉强度达750 MPa,屈强比接近0.85,高于X70级管线钢。

The structure, strength and impact toughness of linepipe steel X80 - 0.04C, 1.87Mn, 0.27Mo, 0.06Nb, 0.006V, 0.017Ti were tested and compared with linepipe steel X70. The examination results showed that as structure of the linepipe steel X80 was acicular ferrite ＋ fine dispersed bainite, the steel had better strength and toughness, its tensile strength was up to 750 MPa and ratio of tensile strength to yield strength was nearly up to 0.85, all was high than that of pipeline steel X70.