40 t EAF-LF-VD-3.7 t铸锭工艺高品质齿轮钢20MnCr5H-1的研制

摘要

采用40 t电弧炉-LF-VD-3.7 t锭模铸-车制工艺开发了20MnCr5H-1高品质齿轮钢(/％:0.17～0.22C,≤0.12Si,1.0～1.5Mn,≤0.035P,0.015～0.035S,0.8 ～ 1.3Cr,≤0.002 0O,0.015～0.045Al)-Φ80 mm材.通过控制EAF终点[P]≤0.015％,LF精炼渣碱度≥2.5,并调整钢中元素含量,VD处理、喂硫线等工艺措施,试制的5炉20MnCr5H-1钢的成分为(/％):0.16～0.20C,0.05 ～0.12Si,1.20～1.30Mn,0.009 ～0.025P,0.020～0.035S,1.00～1.10Cr,0.000 8～0.001 50,0.015 ～0.040Al,淬透性带宽△HRC为4,各项指标均满足要求.