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对国内外具有代表性的三家企业生产的X100级管线钢的微观组织及其与力学性能之间的关系进行研究。结果表明:X100级管线钢的微观组织由针状铁素体、粒状贝氏体和M/A岛组成。由于化学成分的细微差别及轧制工艺的不同,各组织在管体中所占的比例和形态不同,其力学性能包括拉伸性能和冲击性能存在很大的差异,而对硬度和止裂韧性方面没有明显的影响。只要严格控制钢中S、P含量,采用合理工艺确保其微观组织晶粒细小且分布均匀,避免M/A岛呈大面积的层片状分布,就有利于提高管线钢的拉伸性能和冲击性能,从而获得良好的满足要求的高强度级别的管线钢管。
The microstructure of X100 grade pipeline steel produced by three enterprises at home and abroad and its relationship with mechanical properties were studied. The results show that the microstructure of X100 grade pipeline steel consists of acicular ferrite, granular bainite and M / A island. Due to the chemical composition of the nuances and the different rolling process, the organization in the proportion of the body and the shape of the tube, its mechanical properties, including tensile properties and impact properties are very different, and the hardness and crack toughness There are no obvious effects. As long as the strict control of steel S, P content, using reasonable technology to ensure that the microstructure of its fine and uniform grain distribution, to avoid M / A Island was a large area of lamellar distribution, it is conducive to improving the tensile properties of pipeline steel and impact Performance, to get a good meet the requirements of the high strength level of the pipeline.