关键词: 顶底复吹转炉, 低碳钢, 冶炼工艺

Abstract: Based on real production data, the process for melting low carbon steel 08Al (% : ≤0. 08C, 0. 17 - 0. 37Si, 0. 25 〜0. 65Mn, ≤0. 030P, W0. 030S, 0. 015 〜0. 065 Als) by an 100 t top and bottom combined blown converter at Lianyuan Steel has been analyzed and studied. It is found that its bottom blowing is intense in later period led to part liquid over-oxidation, and there is a definite deviation between the real end [C] [O] and the theoretical equilibrium [ C] [O] product; as basicity of converter end slag is 4 ~ 5 , the distribution coefficient of phosphorus and sulphur between liquid steel and slag is largest and the effect of dephosphorization and desulphurization is best, while higher end [C] , lower (FeO) and lower oxidability of slag are unfavourable to dephosphorization but favourable to desulphurization； and the lower encl temperature of melting liquid steel, higher [C] and lower oxidability of liquid and furnace slag, the higher the residual manganese content in liquid steel.