Abstract: The effect of structure of electroslag remelting (ESR) mold, cooling intensity t voltage, current and slow- cooling method on internal cracks of 200 kg ESR ingot of Fe-Cr-Al alloy (/%: 0. 024C, 0. 26Si, 0. 17Mn, 20.1Cr, 5. 3Al, 0. 05RE) has been studied by pilot-scale production. Results show that with the measures including modifying original mold bottom water box to indirect water-cooling unit, increasing inlet water rate, decreasing voltage and current respectively from original 5 400 A and 55 V to 5 000 A and 50 V to lower bath temperature, and using expanding perlite shielding material for holding and soaking, the macrostructure of ESR ingot is compact and uniform, and there are no internal cracks.

摘要： 通过工业试验研究了铁铬铝合金(/%:0.024C,0.26Si,0.17Mn,20.1Cr,5.3Al,0.05RE)200 kg电渣重熔结晶器的结构、冷却强度、电压电流、缓冷方式等对内裂纹的影响。结果表明,通过将原结晶器底水箱改为间接水冷装置,提高进水量,将电流、电压分别由原来的5 400 A和55 V降至5 000 A和50 V以降低熔池温度,采用膨胀珍珠岩覆盖剂保温均热等措施,使电渣锭低倍组织致密均匀,无内裂纹。

关键词: 铁铬铝合金, 电渣重熔, 内裂纹, 工艺措施;