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通过金相、扫描电子显微镜的表征手段和抗HIC性能测试,研究了不同调质工艺(940℃淬火,530℃、580℃、630℃回火)和940℃正火对TMCP态X65抗酸管线钢的显微组织和抗HIC性能的影响。结果表明,热处理前后三种X65管线钢的抗HIC性能均满足API 5L规范中酸性服役条件PSL2钢管在A溶液中的验收极限。调质处理后的X65抗酸管线钢厚度中心由M/A岛偏聚形成的带状组织消失,各项力学性能均满足API 5L规范对X65钢级管线钢的要求,抗HIC性能较TMCP态显著提高;940℃正火处理后的X65抗酸管线钢沿轧制方向形成了珠光体带状组织,其抗HIC性能和拉伸性能较TMCP态降低。
The effects of different tempering process (940 ℃ quenching, 530 ℃, 580 ℃, 630 ℃ tempering) and normalizing at 940 ℃ on the TMCP X65 acid-resistant pipelines were studied by means of metallographic examination, scanning electron microscopy, Effect of Steel Microstructure and HIC Resistance. The results show that the anti-HIC performance of the three X65 pipeline steels before and after the heat treatment satisfies the acceptance limit of the PSL2 steel tube in the A solution of the acid service condition in the API 5L specification. The quenched and tempered X65 acid-resistant pipeline steel thickness center disappeared by the segregation of M / A islands, and all the mechanical properties satisfied the requirements of API 5L code for X65 steel grade pipeline steel. The anti-HIC performance was better than TMCP state The X65 acid-resistant pipeline steel after normalizing at 940 ℃ formed a pearlite band structure along the rolling direction, and its anti-HIC properties and tensile properties were lower than that of TMCP state.