Abstract: The metallurgical flowsheet of tested steel 1Cr12Ni3Mo2VN (/%: 0.13C, 0.16Si, 0.70Mn, 11.42Cr, 2.78Ni, 1.67Mo, 0.30V, 0.0360N) is 30t EAF-LF-VD-3t ESR-forged to Φ350mm products. The effect of quenching at 950~1100°C and tempering at 200 ~700℃ on structure and properties of steel 1Cr12Ni3Mo2VN and the tensile properties of steel aging at 500°C for 500~10000h have been studied. Results show that the effect of quenching temperature at 950~1100°C on mechanical properties of steel 1Cr12Ni3Mo2VN is not obvious；the temper brittleness zone of steel is at about 600°C , nevertheless tempered at this temperature the decrease of plasticity of steel is smaller；as compared with the mechanical properties of steel 1Cr12Ni3Mo2VN quenched at 1040°C. and tempered at 540°C , with ageing at 500°C for 500h the tensile strength and yield strength of steel decrease respectively by 7.7% and 5.8% , and with ageing at 500°C for 10000h the tensile strength and yield strength of steel decrease respectively by 13.4% and 14.6% , and the reduction of area of steel decreases by 40% , its main cause is aggregation of impurity elements and deposition of carbide at grain boundary.

摘要： 试验1Cr12Ni3Mo2VN钢（/%:0.13C,0.16Si,0.70Mn,11.42Cr,2.78Ni,1.67Mo,0.30V,0.0360N）的冶金流程为30t EAF-LF-VD-3t ESR-锻造成Φ350mm材。研究了950~1100℃淬火和200~700℃回火对1Cr12Ni3Mo2VN钢组织与性能的影响以及500℃,500~10000h时效的拉伸性能。结果表明,淬火温度950~1100℃对1Cr12Ni3Mo2VN钢力学性能的影响不明显;该钢的回火脆性区在600℃左右,但对钢的塑性的影响较小。经1040℃淬火、540℃回火的1Cr12Ni3Mo2VN钢,在500℃时效500h后,其抗拉强度和屈服强度分别下降了7.7%和5.8%,时效10000h后,其抗拉强度和屈服强度分别下降了13.4%和14.6%,断面收缩率下降了40%,主要原因是杂质元素在晶界处偏聚以及碳化物在晶界处析出。

关键词: 1Cr12Ni3Mo2VN, 马氏体耐热钢, 热处理, 组织, 性能, 时效