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Commonly used screw rod materials in my country include 45# steel, 40Cr, amine steel, 38CrMOAl, high temperature alloys, etc. 1) 45# steel is cheap and has good processing performance, but poor wear and corrosion resistance. Heat treatment: quenching and tempering HB220-270, high frequency quenching HRC45--48. 2) The performance of 40Cr is better than that of 45# steel, but it is often plated with a layer of chromium to improve its corrosion resistance and wear resistance. However, the requirements for the chrome plating layer are high. If the plating layer is too thin, it is easy to wear, and if it is too thick, it is easy to peel off. After peeling off, it accelerates corrosion and has been less used. Heat treatment: quenching and tempering HB220-270, hard chrome plating HRC>553) nitridni čelik i 38Crmoal imaju relativno izvrsne sveobuhvatne performanse i široko se koriste. Općenito, nitrid sloj dostiže 0. 4-0 6 mm. Međutim, ovaj materijal ima malu otpornost na koroziju hlorida vodonik i relativno je skupa. 4) Materijal od legure visoke temperature je superiorniji od ostalih materijala. Ovaj materijal nije potreban premaz i uglavnom se koristi za vijke bez halogena bezbrižanh mašina za brizganje. Ovaj materijal ima visoku oksidacijsku otpornost i otpornost na koroziju. Toplinska obrada HRA55`60.