宽厚板低成本洁净钢生产工艺

 为了进一步提高钢板洁净度,降低生产成本,通过理论计算和工业试验对宽厚板LF-VD精炼双联低成本洁净钢生产工艺进行了研究。VD精炼过程中,精炼渣中SiO₂与钢中铝反应,使渣中SiO₂质量分数降低、Al₂O₃质量分数升高。通过优化转炉和精炼脱氧合金化制度,降低VD前精炼渣中SiO₂质量分数和钢中铝质量分数,减弱了VD过程渣钢反应。VD过程铝损降低29%。不仅炼钢过程综合吨钢铝耗降低0.68 kg,而且钢板洁净度显著提升。全氧和氮质量分数都分别降低0.000 6%,钢板中大于2 μm夹杂物数量密度降低74%,大于5 μm夹杂物数量密度降低81%。

Production process of low-cost clean steel for wide and heavy plate

In order to further improve the cleanliness of steel plate and reduce production cost,the production process of low-cost clean steel with LF-VD refining for the wide and heavy plate was studied by theoretical calculation and industrial tests. In the VD refining process, SiO₂ in the refining slag reacted with Al in the steel, reducing the mass percent of SiO₂ and increasing the mass percent of Al₂O₃ in the slag. By optimizing the converter and refining deoxidization and alloying system, the mass percent of SiO₂ in the refined slag and the mass percent of Al in the steel before VD were reduced, and the reaction of slag-steel in VD process was weakened. Aluminum loss in the VD process was reduced by 29%. Not only did the aluminum consumption of per ton steel decrease by 0.68 kg, but also the cleanliness of the steel plate increased significantly. The mass percent of total oxygen and nitrogen were decreased by 0.000 6%, and the number density of inclusions which more than 2 μm and more than 5 μm in the steel plate were decreased by 74% and 81% respectively.