Abstract: The tested steel 0Cr17Ni4Cu4Nb (/%: 0.016~0.017C, 0.31~0.35Si, 0.79~0.85Mn, 0.009~0.012P, 0.008~0.010S, 15.29~15.43Cr, 4.10~4.15Ni, 3.34~4.92Cu, 0.25~0.27Nb) is melted by a 25kg vacuum induction furnace and forged to Φ18mm bar. The 3.34%~4.92% Cu content on phase transformation point of steel 0Cr17Ni4Cu4Nb, mechanical properties and structure of steel oil-quenched at 1040°C for 1h and oil-cooling aged at 460~610°C for 2h is tested and studied by mechanical properties measurement and structure analysis. Results show that with increasing Cu content in steel the effect of Cu content on Ac₃ is not obvious but the Ac₁ decreases in some extent, and the M_s point of steel moves up while the M_f point of steel comes down；with higher Cu content in steel the strength and hardness of steel is higher, but plasticity of steel is slightly lower；with control the Cu content in steel being minimum to middle of standard permissible variations, it is able to meet the mechanical properties requirement of specification, i. e. with aged at 460~500℃ the steel R_m≥1315MPa, R_p0.2≥1175MPa, A≥10% and Z≥40%.

摘要： 试验0Cr17Ni4Cu4Nb钢（/%:0.016~0.017C,0.31~0.35Si,0.79~0.85Mn,0.009~0.012P,0.008~0.010S,15.29~15.43Cr,4.10~4.15Ni,3.34~4.92Cu,0.25~0.27Nb）由25kg真空感应炉冶炼,锻造成Φ18mm棒材。通过力学性能测试和组织分析,试验研究了3.34%~4.92%Cu含量对0Cr17Ni4Cu4Nb钢相变点,1040℃1h油冷,460~610℃2h空冷时效的力学性能和组织的影响。结果表明,钢中Cu含量增加,对该钢Ac₃无显著影响,Ac₁下降,M_s点上升,M_f点下降;钢中Cu含量高时,钢的强度、硬度较高,塑性略低;当Cu含量为中下限时,可满足技术条件力学性能的要求,即460~500℃时效后R_m≥1315MPa,R_p0.2≥1175MPa,A≥10%,Z≥40%。

关键词: 0Cr17Ni4Cu4Nb马氏体沉淀硬化不锈钢, Cu含量, 力学性能, 富Cu相