电渣重熔对高氮17Cr-17Mn-2Mo奥氏体不锈钢冶金质量和性能的影响

Effect of Electro-Slag Remelting on Metallurgical Quality and Properties of High Nitrogen 17Cr-17Mn-2Mo Austenite Stainless Steel

通过50 kg真空加压感应炉+气氛保护电渣重熔(ESR)熔炼的超低碳17Cr-17Mn-2Mo-0.8N奥氏体不锈钢,研究了该钢ESR前后的夹杂物含量和尺寸、冶金质量和力学性能。结果表明,经电渣重熔,钢中夹杂物含量明显降低,夹杂物平均尺寸由重熔前的2.36μm降低至1.81μm,钢中硫含量由重熔前0.004%降低至0.001%;电渣重熔后Φ20 mm锻材组织均匀细小,力学性能R_m、A和A_(KU)分别从重熔前924 MPa、30.5%和248 J提高到1 053MPa、50.0%和296 J;电渣重熔消除了电极中的气孔缺陷,电渣锭成材率较电渣前提高了30%以上。

The 17Cr-17Mn-2Mo-0. 8N ultra-low carbon austenite stainless steel is melted by a 50 kg vacuum and pressure induction furnace ＋ gas shielded electroslag remelting （ESR） process, and the inclusions content and size, metallurgical quality and mechanical properties of steel before and after ESR are studied. Results show that with ESR the inclusions content in steel decreases obviously, the average size of inclusions decreases to 1.81μm from 2. 36μm before ESR, and the sulphur content in steel decreases to 0. 001% from 0. 004% before ESR; after ESR the structure in Ф20 mm forged bar is fine and uniform, the mechanical properties Rm, A and AKu of steel respectively increase to 1 053 MPa, 50.0% and 296 J from 924 MPa, 30. 5% and 248 J before ESR; the blowhole defect in electrode is eliminated by ESR, as compared before ESR the yield of ESR ingot increases by more than 30%.