锻造变形方式对叶片钢1Cr12Ni2Mo2VN横向冲击韧性的影响

分析了常规锻造-拔长,镦粗-拔长,镦粗-拔长-镦粗-拔长,镦粗-换向拔长4种锻造方式对叶片钢1Cr12Ni2Mo2VN(%:0.10C,0.17Si,0.74Mn,0.014P,0.002S,11.8Cr,2.43Ni,1.65Mo,0.32V,0.035 2N)2.5t电渣锭锻造成Φ220 mm棒材横向冲击韧性的影响。结果表明,单道次大压下量的镦拔锻造及镦拔次数的增加可显著提高叶片钢的横向冲击韧性,2镦2拔后的棒材经1050℃1h油冷,660℃2h空冷后的横向冲击功为141 J,横纵向冲击值比可达90%以上,组织均匀,晶粒细化。

叶片钢1Cr12Ni2Mo2VN 1.1t电渣锭重熔工艺的优化

叶片钢1Cr12Ni2Mo2VN电极坯母材(/%:0.10C,0.24Si,0.81Mn,0.013P,0.002S,11.75Cr,2.63Ni,1.70Mo,0.32V,0.033N)的生产流程为30 t EAF-VOD-LF-2.67 t铸锭-退火-Φ250 mm锻坯。通过将ANF-6二元渣改成高纯度、低杂质NEU_D06预熔四元渣,平均熔速由5.27 kg/min降低至3.5~4.0 kg/min等工艺措施,成功地生产出Φ430mm叶片钢1Cr12Ni2Mo2VN电渣锭(/%:0.10~0.12C,0.75~0.86Mn,0.21~0.24Si,0.011~0.014P,0.000 1S,11.76~11.82Cr,2.54~2.61Ni,1.63~1.71Mo,0.31~0.32V,0.039N)。检验结果表明,电渣锭的组织为马氏体+0.5%~1.5%8-铁素体,非金属夹杂物总和为1.5~2.0级,[0]15×10^(-6)~17×10^(-6),[H]1.24×10^(-6)~1.47×10^(-6),保证了电渣钢的质量。