一种超低氧易切削合金模具钢及其冶炼方法
By combining high-sulfur molten iron smelting with ultra-low alkalinity slag system and vacuum refining, the problem of unstable oxygen content in free-cutting alloy mold steel was solved, improving the purity of molten steel and the quality of cast billets, and extending tool life.
CN118147529BActive Publication Date: 2026-07-17INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INST OF RES OF IRON & STEEL JIANGSU PROVINCE
- Filing Date
- 2024-03-04
- Publication Date
- 2026-07-17
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Abstract
本发明公开了一种超低氧易切削合金模具钢及其冶炼方法，属于炼钢的技术领域。超低氧易切削合金模具钢中：T.O≤0.0010%、Alt≤0.0025%、Ti≤0.0010%。冶炼方法包括高炉冶炼；转炉冶炼，转炉出钢，LF精炼，RH真空精炼，连铸。本发明铁水预处理KR不脱硫处理，获得高硫铁水，增大转炉出钢时钢水硫含量。转炉出钢过程先加部分硅、锰合金弱脱氧，同时出钢过程不加石灰等造渣料，脱氧产物主要是SiO2，形成超低碱度的酸性渣，可避免炉渣脱硫。在RH脱氧合金化时，向钢包渣面加入电石、铝酸钙渣面脱氧剂进一步脱除炉渣中的氧，避免连铸过程中氧化钢水中的合金元素，造成钢水二次污染，进一步提高钢水洁净度。
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