0Cr17Ni4Cu4Nb钢电渣锭开坯后,在钢坯角部有裂纹产生。采用宏观观察、化学成分分析、金相检验等方法对该钢坯裂纹产生的原因进行分析。结果表明:开裂钢坯中的碳、氮、镍等元素含量较低,导致材料的铁素体含量较高,铁素体条带宽度较大;铁素体富集区的塑性较差,最终导致钢坯发生开裂。提高钢坯中的碳、氮、镍等元素的含量,可以改善钢坯的表面质量,避免产生裂纹。

After the opening of the 0Cr17Ni4Cu4Nb steel electroslag ingot, cracks were found at the corners of the billet. The cause of the billet cracks was analyzed by means of macroscopic observation, chemical composition analysis and metallographic examination. The results show that the content of carbon, nitrogen, nickel and other elements in the cracked steel billet was relatively low, resulting in a higher ferrite content and a wider ferrite band width in the material. The poor plasticity of the ferrite enrichment zone ultimately led to cracking of the steel billet. Increasing the content of elements such as carbon, nitrogen and nickel in steel billets could improve the surface quality of the billets and avoid the occurrence of cracks.