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研究了采用300mm厚连铸坯锻轧生产核电特厚钢板的工艺,通过对连铸坯直轧、模铸和连铸坯锻轧3种不同工艺生产的核电特厚钢板内部质量和力学性能进行对比分析,结果表明:连铸坯直轧工艺生产的特厚钢板不能满足NB/T47013-2015《承压设备无损检测》Ⅰ级和GB/T 5313《厚度方向性能钢板》Z向断面收缩率大于35%的要求,钢板内部存在裂纹和偏析。采用锻轧工艺生产的钢板能够100%满足探伤要求,连铸坯芯部裂纹和柱状晶在高温锻造过程中能够有效焊合和破碎,并且高温加热过程对连铸坯的芯部偏析有很大程度的改善,通过锻造和轧制工艺相结合,能够解决连铸坯直轧出现的探伤不合问题,并且能替代高成本的模铸生产,进一步降低生产成本。
In this paper, the process of forging and rolling the thick steel plate produced by 300mm thick slab forging and rolling was studied. The internal quality and mechanical properties of the steel plate produced by 3 different processes of direct rolling, die casting and continuous casting bloom were studied The results show that the thick steel plate produced by direct rolling process of continuous casting slab can not satisfy Grade Ⅰ of NB / T47013-2015 Nondestructive Testing of Pressure Equipment and Z-section reduction of GB / T 5313 Thickness Performance Steel Plate 35% of the requirements of the internal cracks and segregation plate. The steel plate produced by the process of forging rolling can meet the requirement of flaw detection 100%, the core slab cracks and columnar crystals can be effectively welded and broken during the high-temperature forging process, and the core segregation of the slab at high temperature is very large The degree of improvement, through the combination of forging and rolling process, can solve the continuous casting straight rolling appeared substandard problems, and can replace the high cost of die-casting production, to further reduce production costs.