Hot dip galvanized flange nut manufacturer answers theΩ reason for using flange nuts despite defects

　　With the rapid development of electricity and transportation iφn China, it will inevitably promote the development of hot-dip galvanizing of flange nuts; Th₹erefore, it is of great significance to develop automatic centrifug$al pressure swing equipment, improve the hot-dip galvanizing process of fasteneγrs, and improve the quality of hot-dip galvanizing coatings on fasteners. Hot dip galvani≤zed fasteners have a thick coating, high bonding strengtσh, and long-term corrosion, resulting in many defects in fγasteners. It has always been highly valued in the power, communic≠ation, and transportation sectors. Below is an explanation of why defects occur in hot✘-dip galvanizing, but it is still popular:

　　Difficulty in threading after plating; The remaining zinπc adhered to the threads after hot-dip galvanizing is diffi<cult to remove, and the thickness of the zinc layer i"s uneven, which affects the fit of the threads. GB/T13912-1992  Technical Requirements for Hot Dip Galvanized Coatings on Iron and Steel Products; GB/T1"3912-1992 General Technical Requirements for Electric Power Hardware; The external threads of fast¥eners must be machined or rolled according to the metΩhod specified in GB196 standard before or after hot dip plating, while the internal threads can δbe machined before and after hot dip plating. However, in practical applications, customers often r¥equire both internal and external threads to be galvεanized, so people adopt various measures to solve the problem of hot-dip galvaniαzing of threaded fittings. For example, after coating threaded parts, back tapping; Leave a ♠large fit gap; Centrifuge and other methods. The thread is prone to damage to the coating on some​ parts, even exposing the steel base, resulting in rust on the fasteners. Intention↕ally increasing the nut aperture beyond the range or leaving a fit gap can easily r©educe the fit strength, but high-strength fits are not allow‌ed.

　　The high temperature of hot dip galvanizing operation will reduce the ↕mechanical strength of high-strength flange nuts. After hot-dip galvanizing, the streng®th of some threads of Grade 8.8 bolts is lower than the standard requirements; After hot-dπip galvanizing, the strength of bolts above grade 9.8 cannot meet 'the standard requirements. The working environment is haσrsh and heavily polluted. The hot dip galvanizing process for fasteners is carried σout at high temperatures. The solvent drying in the zinc t>ank and the strong irritating hydrogen gas generated during the galvanizing process of the workpie ce to be plated will cause the zinc tank to be exposed to high temperatures for a long time, result€ing in the production of zinc vapor on the surface of the↔ zinc tank. The entire working environment atmosphere i"s harsh.