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针对在酸性冲天炉中,用高硫土焦,如何熔炼高硫铁索体可锻铸铁问题;从生产实际出发,对高硫铁素体采用优选法配料,从熔炼工艺、化学成份、退火规范等方面,进行了系统的试验研究。根据试验研究结果:当S>0.35％时,锰硫比经验公式,Mn=2S+0.275 Mn=2S+0.2 Mn=1.7S+0.2 Mn=1.7S等,已不适用于高硫土焦,熔炼高硫铁素体可锻铸的这一事实。并在这一事实的基础上,确立了新的锰硫比经验公式Mn=s+0.4。新的锰硫比经验公式,不仅适用于高硫,对中硫和低硫也是适用的。文章同时对传统的退火规范中,有关第二阶段温度的计算公式A_(1·1)=738+5(Si％)~2和A_(1·2)=738+18(Si％)~(1.75),提出了不同的看法。并修改了这些公式,被修改后的公式A_(1·2)=738C°-5(5.3Mn-Si)~2,事实证明更合乎生产实际。
Aiming at how to smelt the ferrochromium iron malleable cast iron with high sulfur coke in the acid cupola, the optimal method for the high-sulfur ferrite is adopted from the actual production, from the smelting process, the chemical composition, the annealing specification and so on The system of experimental research. According to the experimental results, when S> 0.35%, the ratio of manganese to sulfur is less than empirical formula, Mn = 2S + 0.275 Mn = 2S + 0.2 Mn = 1.7S + 0.2 Mn = High-sulfur ferritic malleable this fact. On the basis of this fact, a new Mn-S ratio empirical formula of Mn = s + 0.4 was established. The new manganese sulfur ratio empirical formula, not only for high sulfur, sulfur and low sulfur is also applicable. At the same time, in the traditional annealing specification, the calculation formulas of the second stage temperature are: A_ (1 1) = 738 + 5 (Si%) ~ 2 and A_ (1 2) = 738 + 18 (Si%) ~ 1.75), put forward different views. And modified these formulas, the modified formula A_ (1 · 2) = 738C ° -5 (5.3Mn-Si) ~ 2, proved more in line with the actual production.