大家熟悉的六角螺栓经常用在各种地下管线工程中,它们使用年限的长短,会影响到整个工程的质量。在地下管线工程中,由于土壤、水分等腐蚀因素作用,螺栓很容易锈蚀,这样就会给以后的螺栓拆卸、更换管件、管线维修等工作带来困难。 Commonly known hex bolts are often used in a variety of underground pipeline projects, the length of their useful life, will affect the quality of the entire project. In the underground pipeline project, due to soil, water and other corrosive factors, the bolt is easy to rust, so it will later bolt disassembly, replacement of pipe fittings, pipeline maintenance and other difficulties.