Abstract: It is found that a large amount of surface transverse cracks at Φ200 mm round bar forged from 2.5 t ESR ingot remelted from 20 t EAF-VOD-LF-VD-casting electrode. To observe the morphology of cracks by scanning electron microscope the analysis results show that overheating of ingot before forging leads to melting of grain boundary to form forging cracks. It is obtained by test and production practice that as steel 022Cr25Ni22Mo2N ingot heating temperature decreases from original 1 180 to 1 100 X. the forgings cracks are eliminated.

摘要： 20 t EAF-VOD-LF-VD-铸棒-2.5 t电渣重熔锭锻成Φ200 mm圆棒上发现大量表面横向裂纹,采用扫描电镜对裂纹的微观形貌进行观察,分析结果表明,裂纹是由于锻造前加热温度过高,导致了晶界熔融而造成的。通过试验和生产实践得出,022Cr25Ni22Mo2N钢电渣锭加热温度由原1180℃降至1110℃时,消除了锻材裂纹。