高速钢磨屑直接还原铁冶炼新型模具钢W4Mo3Cr4VRE

New Die Steel W4Mo3Cr4VRE Smelting by using High Speed Steel Filings of Grinding DRI

在250kg感应炉,利用高速钢磨屑直接还原铁(海绵铁%:0.44C-4.62W-3.27Mo-2.2Cr-0.98V),配加一定含量高速钢车屑废钢(%:0.87C-3.50W-1.30Mo-1.50Cr-0.60V),冶炼成一种新型模具钢W4Mo3Cr4VRE(%:0.78～0.88C、3.50～4.50W、2.50～3.50Mo、3.80～4.40Cr、1.10～1.60V、0.15～0.25RE)再经电渣重熔。检验结果表明,电渣重熔后,该钢1180℃淬火+250℃2次回火,HRC硬度值≥60,冲击韧性≥49J/cm2;当1150℃或1180℃淬火+560℃2次回火时,其HRC硬度值达66。该实验结果证实了采用精选、还原烧结、电炉配料的冶炼工艺对磨屑的回收利用是可行的,生产的新型钢能满足耐火制品模具使用性能的要求。

A new die steel W4Mo3Cr4VRE （0.78 ～0.88C, 3.50 ～4.50W, 2.50 ～ 3.50Mo, 3.80 ～4.40Cr, 1.10 ～ 1.60V, 0. 15 ～ 0. 25RE） was smelted by using high speed steel filings of grinding DRI （ sponge iron 0. 44C- 4. 62W-3. 27Mo-2. 20Cr-0. 98V） with definite amount scrap of high speed steel turnings （0. 87C-3.50W-1.30Mo-1.50Cr- 0. 60V） in a 250 kg induction furnace and refined by ESR. Examination results showed that with 1 180℃ quenched ＋ 250℃ double tempered the HRC hardness value of ESR steel was ≥60, toughness impact ≥49 J/cm^2, and with 1 150℃ or 1 180℃ quenched ＋ 560℃ double tempered, the HRC hardness value of ESR steel was up to 66. The study results confirm that it is available to recover and reuse the filings of grinding by magnetic separation, direct reduction and electric furnace melting, and the produced new die steel can meet the requirement of application performance of refractory products die.