介绍一种实用的模铸氩气保护浇注方法,能有效地降低钢液浇注过程中的二次氧化,特别是明显降低法兰断口的夹杂物含量。在模铸浇注前对锭模进行30min充氩,并在浇注过程中采用全封闭氩气保护浇注(氩气流量控制在15～40Nm3/h),既可明显降低浇注系统内的氧体积分数至0.5%以下(空气中标定VO2为20.5%),又能有效减少发蓝断口的宏观夹杂物含量。 A practical method of mold casting argon protection pouring is introduced, which can effectively reduce the secondary oxidation in the molten steel pouring process, especially obviously reducing the content of inclusions in the flange fracture. The ingot mold was filled with argon for 30 min before pouring, and fully enclosed argon protection pouring (argon flow control at 15 ~ 40 Nm3 / h) during pouring could significantly reduce the oxygen volume fraction in the pouring system to 0.5% or less (air calibration VO2 20.5%), but also can effectively reduce the macroscopic inclusions content blue hair fracture.