| 钎具钢55SiMnMo轧材表面裂纹的成因分析及工艺改进 |
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| 引用本文： | 赵景存,朱 叶.钎具钢55SiMnMo轧材表面裂纹的成因分析及工艺改进[J].特殊钢,2023,44(1):45-48. |
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| 作者姓名： | 赵景存 朱 叶 |
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| 作者单位： | (石钢京诚装备技术有限公司，营口115000) |
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| 摘 要： | 针对100 t BOF-LF-VD-Φ450 mm连铸坯-Φ200 mm轧材流程生产的钎具钢55SiMnMo轧材表面易产生裂纹缺陷，分析对比了过热度、二次冷却、拉速、成分(Ti.B)等对缺陷的影响。通过工艺改进；控制钢水过热度20～30℃,控制B含量≤0.0008%,加Ti 0.015%～0.025%,拉速0.41 m/min,二冷比水量0.17 L/kg,使裂纹的缺陷率由原来的12.2%降低到1.6%。
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| 关 键 词： | 55SiMnMo钎具钢 表面裂纹 工艺改进 |
Cause Analysis on Surface Crack of Drill Steel 55SiMnMo Rolling Product and Process Improvement |
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| Zhao Jingcun,Zhu Ye.Cause Analysis on Surface Crack of Drill Steel 55SiMnMo Rolling Product and Process Improvement[J].Special Steel,2023,44(1):45-48. |
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| Authors: | Zhao Jingcun Zhu Ye |
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| Affiliation: | Zhao Jingcun, Zhu Ye |
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| Abstract: | The surface of rolled products of drill steel 55SiMnMo produced by 100 t BOF-LF-VD-4450 mm CC bloom- φ200 mm rolling bar production process is prone to surface crack.The effect of superheat,secondary cooling,casting speed and composition(Ti.B)on defects are analyzed and compared. Through process improvement which is obtained that by controlling superheat 20-30 ℃,B content controlled≤0.0008%,Ti content 0.015%-0.025%,drawing speed 0.41 m/min,and secondary cooling ratio 0.17 L/kg,the crack defect rate decreases from 12.2% to1.6%. |
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