铁素体不锈钢凝固过程中形成的柱状晶会影响钢的成形性,减少甚至避免铸坯柱状晶的形成,促进等轴晶的形成,对铁素体不锈钢来说尤为重要。采用连铸和模铸的试验方法浇铸了铁素体不锈钢430,以分析影响其凝固结构的因素。结果表明,电磁搅拌对430不锈钢连铸坯等轴晶的形成作用显著。无论模铸试验还是连铸试验,冷却强度对430铸坯柱状晶的形成都有明显的影响。在模铸试验条件下,碳、氮含量越高,越有利于其凝固时等轴晶的形成;在连铸试验条件下,由于温度梯度大,碳、氮含量对凝固组织的影响被削弱,但如果对钢液进行搅拌,碳、氮含量的变化对凝固组织仍然有明显的影响。
Columnar crystals in ferritic stainless steel formed during solidification were harmful to steel formablity,so it was important to avoid columnar crystal forming and promote equiaxed crystal forming for ferritic stainless steel.The solidification microstructure under cast test and continuous cast test conditions was analyzed.The results show EMS benefits equiaxed crystal forming and cooling intensity plays an obvious role to columnar crystals forming under both mould cast test and continuous cast test.C and N contents have also effect on 430 solidification structure under cast test.Under the conditions of strong temperature gradient during continuous casting,effect of C and N content on solidification microstructure will be decreased.However,if liquid steel was stirred during continuous casting,C and N contents still play an obvious role on 430 solidification microstructure.
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