Commonly Used Materials For Threaded Rods

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) Nitrided steel and 38CrMoAl have relatively excellent comprehensive performance and are widely used. Generally, the nitrided layer reaches 0.4-0.6 mm. However, this material has low resistance to hydrogen chloride corrosion and is relatively expensive. 4) High temperature alloy material is superior to other materials. This material does not need coating and is mainly used for halogen-free screws of injection molding machines. This material has high oxidation resistance and corrosion resistance. Heat treatment hra55`60.