Abstract: It is available to carry out carbon pick-up operation by using 20%~30% hot metal charging,con- trolling oxygen blown rate and 1.8~2.8 basicity of binary slag for production of medium and high carbon steels such as 50CrVA,60Si2Mn and 77Mn during EAF steel making with 70 t EAF -LF-CCM flow sheet. The production statistical data showed that with EAF carbon pick-up operation the end C of steel was 0.25%~0.53%,P was 0.006%~0.015%,and temperature of steel 1593~1625 ℃.Although EAF carbon pick-up operation prolonged steel making period for 5～10 min,the LF feeding wire amount decreased more than 1/2,it obviously decreased melting cost and increased steel quality.

Key words: EAF,Medium and High Carbon Steel, Carbon Pick-up Operation,Dephosphorization

摘要： 在70tEAF-LF-CCM 流程生产50CrVA、60Si2Mn、77Mn 等中、高碳钢时，EAF 炼钢过程采用 20%～30%热装铁水，控制供氧强度，二元渣碱度1.8~2.8可有效进行留碳操作。生产统计表明，EAF 留碳 操作终点C 为0.25%～0.53%,P为0.006%~0.015%,钢水温度1593～1625℃。 EAF 留碳操作虽使冶炼 周期延长5～10 min,但LF 喂丝量降低1/2以上，显著降低冶炼成本和提高钢水质量。

关键词: EAF, , 中、高碳钢, 留碳操作, 脱磷