Incoloy825合金280mm×325mm电渣重熔坯抽锭工业试验

摘要

试验了Incoloy825合金电极(/％:0.01C,0.21Si,0.41Mn,0.007S,0.019P,22.33Cr,39.08Ni,3.04Mo,2.14Cu,1.17Ti,0.17Al)由3t中频炉+3 t AOD冶炼,并经抽锭电渣重熔成280 mm×325 mm坯(/％:0.01C,0.21～0.23 Si,0.40 Mn,0.005S,0.023 ～0.024P,22.48 ～ 22.50Cr,39.10～39.13 Ni,3.05～3.07 Mo,2.14 ～2.15 Cu,1.00～1.10Ti,0.15 ～0.18A1).试验表明,Incoloy825合金方坯抽锭电渣重熔过程中,由于Ti烧损,渣中TiO2含量不断增加,熔渣的粘度也不断上升,导致钢渣不易分离.通过改进抽锭电渣重熔渣系配比,采用(/％) 57CaF2,15CaO,5MgO,15Al2O3,5SiO2,3TiO2渣系以及控制电极熔化速度680 kg/h,重熔过程加0.43 kg/t铝粒以控制Ti烧损,使Incoloy825合金铸坯表面质量明显改善.