Abstract: The tested stainless steel 17-4PH (/% : 0.02 ~ 0. 03C, 0.40 ~ 0.50Si, 0.41 ~0. 60Mn, 0.018 ~ 0. 026P, 0. 001S, 15. 56 ~ 15.75Cr, 4. 31 ~ 4. 50Ni, 3. 21 ~ 3.40Cu, 0. 20 ~ 0.25Nb, 0. 013 〜0. 067N) is melted by 20 t EAF + LF + VOD + ESR process and forged to Φ150 mm bar products. Test results show that with increasing N content in steel from 0, 013% to 0. 067% , the ferrite content in steel increases from 0. 5% to 6% , the strength and hardness of steel increase and the plasticity of steel decreases. As to control the N content in steel 0. 020% ~0. 045% , the ferrite content in steel is 1% 〜3% and the mechanical properties of steel quenched at 1040 ℃ for 1 h, water cooling + 480 °C for 2 h, air cooling, the mechanical properties of test steel are qualified; and the HB hardness value of so Ed-solution-treated steel is ≤325, so the workability of steel is improved.

摘要： 试验用17-4PH不锈钢(/%:0.02～0.03C,0.40～0.54Si,0.41～0.60Mn,0.018～0.026P,0.001S,15. 56～15. 75Cr,4. 31～4. 50Ni,3. 21～3.40Cu,0. 20～0. 25Nb,0. 013～0. 067N)采用20 t EAF+LF+VOD+ESR的工艺冶炼,锻造成Φ150 mm棒材。试验结果表明:钢中N含量由0.013%增加至0.067%时,钢中铁素体含量由0.5%增至6%,钢的强度、硬度升高,塑性降低。当N含量控制在0.020%～0.045%,钢中铁素体含量为1%～3%,经1040℃ 1h水冷+480℃  2 h空冷后,钢的力学性能合格;固溶态钢的HB硬度值≤325,优化了该材料的加工性能。