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) Nitredetam tēraudam un 38Crmoal ir salīdzinoši izcila visaptveroša veiktspēja, un tos plaši izmanto. Parasti nitriders slānis sasniedz 0. 4-0. 6 mm. Tomēr šim materiālam ir zema izturība pret ūdeņraža hlorīda koroziju un tas ir salīdzinoši dārgs. 4) Augstas temperatūras sakausējuma materiāls ir pārāks par citiem materiāliem. Šim materiālam nav nepieciešams pārklājums, un to galvenokārt izmanto iesmidzināšanas mašīnu skrūvēm, kas nesatur halogēnu. Šim materiālam ir augsta izturība pret oksidāciju un izturība pret koroziju. Siltuma apstrāde HRA55`60.

