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对马钢2250热连轧生产的X80管线钢的力学性能、显微组织、析出物及制作的螺旋焊管质量进行了分析研究。结果表明:马钢生产的厚18.4 mm X80管线钢力学性能优良,平均屈服、抗拉强度分别为575 MPa和660MPa,-20℃平均冲击功为295 J,-15℃DWTT平均剪切面积为98%。马钢X80管线钢为针状铁素体组织,晶粒细小,析出物呈弥散分布。制造的管体满足西气东输二线标准对X80管线钢的质量要求,产品质量优良。
The mechanical properties, microstructure, precipitates and the quality of the spiral welded pipe produced by the MMA 2250 hot rolling mill were analyzed. The results show that the thick 18.4 mm X80 pipeline steel produced by Masteel has excellent mechanical properties, average yield strength and tensile strength of 575 MPa and 660 MPa, respectively. The average impact energy at -20 ℃ is 295 J and the average shear area of DWTT at -15 ℃ is 98 %. Magang X80 pipeline steel is acicular ferrite, with fine grains and precipitates dispersedly distributed. The manufactured pipe body meets the quality requirements of X80 pipeline steel by the second-line West-East Gas Pipeline standard and the product quality is excellent.