These inclusions resulted in cracking of the coldforgingsteel during the cold heading process.
通过理化检测，对铆螺钢在冷镦时出现开裂的原因进行了分析。
2
The reason of cracking phenomenon occurring of the coldforgingsteel was analyzed by the composition and microstructure tests.
通过对铆螺钢的成分与组织检验，对铆螺钢在冷镦时出现开裂现象的原因进行了分析。
3
Aim at faultiness and oneness of the appraisal method of cold heading steel, this paper has proposed the cone forging method. It proves feasibility and gives the rudiment of the method.