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利用光学显微镜和扫描电镜观察了管线钢X80卷板横裂纹的微观形貌和组织特征,利用Gleeble-3800热模拟试验机测定了X80材料的动态连续冷却转变曲线(动态CCT曲线),在国内某生产线上进行了轧制实验和工艺优化。结果表明:精轧过程先共析铁素体的析出是导致横裂纹的根本原因,进入精轧机组的中间坯厚度(BH)和终轧温度(FDT)对X80卷板的表面质量和力学性能有重要影响,当BH=55 mm、FDT=800℃时表面质量和力学性能均合格。
The microstructure and microstructure of horizontal cross-section of X80 coil were observed by optical microscope and scanning electron microscope. The dynamic continuous cooling transformation curve (dynamic CCT curve) of X80 was measured by Gleeble-3800 thermal simulation test machine. The production line was rolling experiments and process optimization. The results show that the precipitation of proeutectoid ferrite during the rolling process is the basic reason for the transverse cracking. The surface quality and mechanical properties of the X80 coil are affected by the thickness of the intermediate billet (BH) and the final rolling temperature (FDT) Has an important effect, when BH = 55 mm, FDT = 800 ℃ surface quality and mechanical properties are qualified.