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研究了铬、钼和微量钛对N80级隔热油管钢显微组织和高温力学性能的影响。结果表明:隔热油管钢的显微组织为回火索氏体,碳化物颗粒均匀分布在铁素体基体上;与不添加铬、钼和微量元素钛的隔热油管钢相比,添加铬、钼和微量元素钛的隔热油管钢的显微组织中碳化颗粒尺寸较大,显微硬度较低,要比在350℃/400MPa条件下的稳态蠕变速率低一个数量级。
The effects of chromium, molybdenum and trace titanium on the microstructure and high-temperature mechanical properties of N80 grade oil-immersed tubing were studied. The results show that the microstructure of the heat-insulated tubing steel is tempered sorbite and the carbide particles are uniformly distributed on the ferrite matrix. Compared with the insulated tubing steel without addition of chromium, molybdenum and trace elements titanium, the chromium , Molybdenum and trace element titanium heat-insulating oil pipe steel microstructure of the carbide particles larger size, lower microhardness than at 350 ℃ / 400MPa steady-state creep rate an order of magnitude lower.