Abstract: The spring steel 65Mn was produced by 100 t top and bottom combined blown converter melting- ladle furnace refining- 6 strand 150 mm×150 mm billet concasting. The end point [C] was0.08%～0. 12%,[P]≤0.012% and [S]≤0.03%, and the yield of recarburizer was 85%～90%. During refining the basicity of slag was 2.5～3.0 with feeding Si-Ca wire and argon stirring. During concasting the temperature of liquid steel in tundish was 1495～1515 ℃, the casting speed 1.6～1.8 m/min using mold electromagnetic stirring. The quality experiment results of 20 heats 65Mn steel showed that the analyses of steel were C 0.63~0.68 ,Mn 0.95～1.07,P0.009～0.023,S0.006～0.017, and the deviation of carbon content at section of casting billet was ≤0.02%.The coil products of 65Mn steel met the requirements of standard GB/T4354- 1994.

摘要： 采用100t 顶底复吹转炉-100t 钢包炉(LF)精炼-6机6流150mm×150mm方坯连铸机生产65Mn  弹簧钢。转炉终点[C]0.08%～0.12%,[P]≤0.012%,[S]≤0.03%,增碳剂收得率为85%～90%。 LF精炼渣 碱度2.5～3.0,并喂Si-Ca线和吹氩。连铸时中间包钢水温度1495～1515℃,铸速1.6～1.8m/min,采用结晶 器电磁搅拌。20炉65Mn钢质量检验结果表明，化学成分(%):C0.63～0.68,Mn 0.95～1.07,P0.009～0.023, S0.006~0.017,连铸坯断面碳含量偏差≤0.02%C。65Mn钢盘条产品符合GB/T4354-1994要求。

关键词: 100 t 转炉, 钢包炉, 连铸, 65Mn弹簧钢