X100级管线钢的微观组织与力学性能的关系
Relationship Between Microstructure and Mechanical Properties of X100 Pipeline Steel
齐丽华 1,2, 杨 龙1, 冯耀荣1, 张建勋2
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作者单位：(1. 中国石油天然气集团公司 管材研究所, 陕西 西安 710065; 2. 西安交通大学 材料科学与工程学院, 陕西 西安 710065)
中文关键字：X100级管线钢； 针状铁素体； 粒状贝氏体； M/A组织； 力学性能
英文关键字：X100 pipeline steel; acicular ferrite; granular bainite; M/A island; mechanical properties
中文摘要：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。
英文摘要：The relationship between microstructure and mechanical properties of X100 pipeline steel was investigated. The results show that the microstructure of X100 pipeline steel consists of acicular ferrite, granular bainite and M/A island. Due to the difference of chemical composition, rolling craft, microstructure proportion and microstructure morphology, the mechanical properties including tensile and impact properties are different, but the hardness and fracture-arrest toughness have not obvious influence. As long as strictly controlling S and P content in the steel, using reasonable craft to guarantee that fine texture crystal grain uniformly distributes and avoids the big area M/A island shaped sheet, it is advantageous to enhance the tensile and impact properties of the pipeline steel, which obtains good high strength rank pipeline steel.