热处理对低碳微合金管线钢腐蚀行为的影响
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摘要
长距离油气运送难免经过地质条件复杂地带,这就要求管线钢具有良好的耐腐蚀、高韧性和高强度。以低碳微合金管线钢为研究对象,对其进行力学性能测试、微观组织观察、均匀腐蚀试验以及交流阻抗(EIS)特征分析。研究了控轧控冷(TMCP)、高温回火、临界区热处理、正火后管线钢的力学性能、微观组织和抗腐蚀性能。结果表明:720℃临界区热处理后试验钢的屈强比为0.69,抗拉强度为779.55 MPa,-40℃冲击功为130.42 J,具有很好的塑韧性;腐蚀28天后,其腐蚀速率为0.27486 mm/a,腐蚀产物膜最为致密,耐蚀性能较好。研究结果可为TMCP钢力学性能和抗腐蚀性能改善提供参考。
Long distance oil and gas transportation inevitably passes through complex geological conditions, which requires pipeline steel to have good corrosion resistance, high toughness and high strength. Taking a low carbon microalloy pipeline steel as the research object, the mechanical properties, microstructure observation, uniform corrosion test and EIS characteristics of the low carbon microalloyed pipeline steel were analyzed. The mechanical properties, microstructure and corrosion resistance of the pipeline steel in controlled rolling and cooling control(TMCP), tempering at high temperature, heat treatment in critical zone, normalizing states were studied. The results show that, after heat treatment in critical zone at 720 ℃,the flexural strength ratio of the steel specimen is 0.69, the tensile strength is 779.55 MPa,-40 ℃ impact energy is 130.42 J,and the toughness is very good. After 28 days of corrosion, the corrosion rate is 0.27486 mm/a, the corrosion product film is the most compact and the corrosion resistance is better. The results can provide a reference for the improvement of mechanical properties and corrosion resistance of TMCP steel.
Long distance oil and gas transportation inevitably passes through complex geological conditions, which requires pipeline steel to have good corrosion resistance, high toughness and high strength. Taking a low carbon microalloy pipeline steel as the research object, the mechanical properties, microstructure observation, uniform corrosion test and EIS characteristics of the low carbon microalloyed pipeline steel were analyzed. The mechanical properties, microstructure and corrosion resistance of the pipeline steel in controlled rolling and cooling control(TMCP), tempering at high temperature, heat treatment in critical zone, normalizing states were studied. The results show that, after heat treatment in critical zone at 720 ℃,the flexural strength ratio of the steel specimen is 0.69, the tensile strength is 779.55 MPa,-40 ℃ impact energy is 130.42 J,and the toughness is very good. After 28 days of corrosion, the corrosion rate is 0.27486 mm/a, the corrosion product film is the most compact and the corrosion resistance is better. The results can provide a reference for the improvement of mechanical properties and corrosion resistance of TMCP steel.
引文
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[4]范强强,华丽.2205双相不锈钢腐蚀行为的影响因素[J].腐蚀科学与防护技术,2014,26(2):178-182.
[5]郭红,何晓英.X70钢在含H2S的弱酸性溶液中的腐蚀行为的电化学研究[J].腐蚀与防护,2007,27(1):62-65.
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[7]衣海龙,杜林秀,王国栋,等.奥氏体变形对铌微合金钢贝氏体相变的影响[J].材料科学与工艺,2008,16(3):442-444.
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