低碳高硫易切削钢冶炼工艺分析

通过在电炉炉后和精炼炉采用硅锰合金或锰铁合金脱氧,将钢中自由氧含量控制在100×10-6以上,电炉炉后采用硫磺粉增硫,精炼炉采用硫铁矿或硫线补硫,将钢中硫含量控制在0.35%～0.41%、Mn/S≥3.0,山东石横特钢生产了1215HS低碳高硫易切削钢,钢中硫化物形态为球形或纺锤形,切削性能良好,完全满足下游用户使用要求。

Metallurgy Technology Analysis of Low Carbon High Sulphur Free-cutting Steel

Shandong Shiheng Special Steel produced 1215HS low carbon high sulfur free-cutting steel through taking a series of process measures.They are as follows：deoxidizing by silicon manganese alloy or manganese iron after electric furnace smelted or in refining furnace,then the free oxygen content in the molten steel was controlled above 100×10-6;resulfurization with sulfur powder after electric furnace smelted and supplement sulfur with pyrite or sulfur wire in the refining furnace,then the sulfur content was controlled between 0.35% and 0.41% and Mn/S≥3.0.The sulfide in the steel demonstrated spherical or spindle-shaped morphologies with good cutting performance.It satisfied the needs of the downstream users entirely.