优化保护渣改善冷镦钢铸坯表面质量

来源期刊：钢铁钒钛2010年第2期

论文作者：杨浩 唐萍 孙维 汪开忠 吴坚 许建 张杰新

文章页码：88 - 92

关键词：35K冷镦钢； 钩型振痕； 保护渣； 微观组织

Key words：35K cold forging steel； hook type of oscillation mark； mould flux； microstructure

摘    要：钩型振痕是某厂生产35K冷墩钢铸坯表面的主要问题,其产生的原因是由于保护渣的润滑性能不良造成。钩型振痕一方面会使铸坯表面产生夹渣、裂纹和皮下气孔等缺陷;另一方面,由于该处传热不好会使局部奥氏体晶粒粗大和微观组织发展而产生组织不均匀的现象,引起轧材冷镦开裂。因此,通过优化结晶器保护渣理化性能,改善保护渣的润滑性能,铸坯钩型振痕得以消除,振痕处组织的不均匀性得到控制,为后续的轧钢过程提供了合格的铸坯。

Abstract: Hook type of oscillation mark was the primary problem about surface quality of strand which was used to product 35K cold Forging steel.The reason that induced hook type of oscillation mark was the poor lubrication of mould flux.On one hand,hook type of oscillation mark would make surface defects on strand,such as inclusion,crack and hypodermal pore.On the other hand,it would produce the phenomenon of nonuniform microstructure because of the poor heat transfer which induced huge austenite grain and developmental microstructure on the surface of strand.It finally caused crack of cold forging steel.Therefore,through optimizing capability about physical property and chemical composition of mould flux and improving the lubrication capability of flux,the hook type of oscillation mark had been removed and the nonuniform microstructure phenomenon on oscillation mark had been controlled.In the end,it provided eligible strand for subsequent rolling process.