由于钢锭内部不可避免地存在偏析、疏松、缩孔及微裂纹等冶金缺陷。
Owing to both physical and chemical properties of metal material, there are inevitably shrinkage cavities, porosity and segregation in ingots.
采用合理、有效的冶炼方法保证钢锭锻造后力学性能、晶粒度及锻造时不产生裂纹。
The mechanical property and the grain size of the steel ingot after smithing are ensured without generating a crackle during smithing by using a rational and effective smelting method.
结果表明：轮箍裂纹是由于钢锭中存在严重的皮下气泡，在轮箍热加工过程中皮下气泡处金属被氧化烧穿导致不能粘合而形成裂纹。
The result showed that the crack forming was due to the billet metal in the subcutaneous blow holes were oxidated during heating process and could not be sticked.
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