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在4 300 mm宽厚板轧机上进行了自升式平台用厚板F460的工业试验,并对低温韧性和Z向性能进行了研究。结果表明,心部条带状M/A岛导致低温韧性偏低,MnS夹杂物诱发厚度方向(Z向)拉伸断面收缩率不合格。采用降低碳、锰含量并提高轧后冷却速率的方法,避免了条带状M/A岛组织,低温韧性明显改善;通过增加Si-Ca线长度,增强对MnS夹杂物的球化效果,生成细小难变形的复合夹杂物,有利于提高平台用厚板的抗层状撕裂性能。
The industrial test of plate F460 for jack-up platform was carried out on 4 300 mm wide plate mill, and the research on the low temperature toughness and Z-direction performance was carried out. The results show that the M / A islands in the heart region lead to the low low temperature toughness, and the MnS inclusions in the thickness direction (Z direction) lead to unacceptable shrinkage in tensile section. By reducing the carbon and manganese content and increasing the post-rolling cooling rate, the microstructure of the M / A island is avoided and the low temperature toughness is obviously improved. The spheroidizing effect of the MnS inclusions is enhanced by increasing the Si-Ca line length, Small and difficult deformation of the composite inclusions, is conducive to improving the plate platform with anti-layered tear properties.