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对断裂螺栓的材质、制造工艺、工作条件、力学性能、金相组织、断口的宏观形貌和微观形貌进行了详细的分析后认为,螺栓的制造工艺不合理,尤其是在粗加工后未进行磨削等精加工,是造成该类螺栓频繁断裂,最终酿成重大事故的原因。认为采用磨削等精加工工艺来降低表面粗糙度,减少表面尤其是圆角过渡处的加工缺陷,酸洗后及时脱氢等工艺措施,就能避免类似的断裂再次发生。
The detailed analysis of the material, manufacturing process, working conditions, mechanical properties, microstructure and the macroscopic and microscopic appearance of the fracture bolt is concluded that the manufacturing process of the bolt is not reasonable, especially after the rough machining Grinding and other finishing, is caused by frequent breakdown of such bolts, the final cause of a major accident. It is considered that the similar fracture can be avoided by adopting the finishing process such as grinding to reduce the surface roughness, reducing the processing defects on the surface, especially the corner transition, and timely dehydrogenating after pickling.