含钒非调质预硬型塑料模具钢48MnV的开发

Development of Non-Quenched-Tempered Vanadium Steel 48MnV for Pre-Hardening Plastic Die

通过实验室50kg中频感应炉冶炼试验研究了（／％）：0．36～0．45C，0．42～0．46Si，1．41～1．49Mn，0．11～0．15V非调质预硬型塑料模具钢C、V含量对该钢硬度的影响。并根据回归分析开发含钒非调质预硬型模具钢48MnV（／％：0．45～0．50C，0．30～0．60Si，1．20～1．40Mn，≤0．020P，≤0．020S，0．15～0．20V）以取代调质P20塑料模具钢（／％：0．35-0．40C，0．40～0．60Si，0．80～1．00Mn，≤0．015P，≤0．015S，1．50～1．80Cr，0．30～0．50M0）。经110炉120t转炉-360mm×450mm连铸坯-≤85mm扁钢轧制-控制冷却速度0．6—1．0℃／s的在线预硬化处婵的生产结果表明，非调质48MnV扁钢HRC硬度值为29．5～33．5，满足相关技术条件要求。

The effect of C and V content on hardness of non-quenched-tempered pre-hardening plastic die steel （/% ： 0. 36- 0. 45C, 0. 42-0. 46Si, 1.41 -1.49Mn, 0. 11 -0. 15V ） has been tested and researched by a 50 kg medium frequency induction furnace in laboratou, and according to regression analysis the vanadium non-quenched-tempered prehardening plastic die steel 48MnV （/% ： 0. 45 -0. 50C, 0.30 -0. 60St, 1.20 - 1.40Mn, ≤0. 020P, ≤0. 020S, 0. 15 0. 20V） is developed to replace the quenched-tempered plastic die steel 1920 （/% ： 0. 35 -0. 40C, 0. 40 -0. 60Si, 0. 80 - 1.00Mn,≤0. 015P, ≤0. 015S, 1.50 - 1.80Cr, 0. 30 -0. 50Mo）. The production results of 110 heats commercial pro- duction by 120 t BOF-360 nnn x 450 mm casting-≤85 mm flat rollingqnline pre-hardening treated with controled cooling rate 0. 6 - 1.0 ℃/s flowsheet show that the HRC hardness value of non-quenched-tempered fiat of steel 48MnV is 29.5 33.5 to meet the requirement of relative specification.