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Common Materials For Screw Rod
May 04, 2017

At present, China's commonly used screw materials are no. 45th steel, 40Cr, amide Steel, 38CrMOAl, high-temperature alloy and so on.

1. No. 45th steel is cheap, the processing performance is good, but the wear-resisting corrosion resistance is poor.

Heat treatment: Tempering HB220-270, high-frequency quenching HRC45--48.

2 40Cr performance is superior to No. 45th Steel, but it is often to be coated with a layer of chromium to improve its corrosion resistance to wear and tear capacity. But the chromium plating layer is higher, the coating is too thin easy to wear, too thick is easy to peel off, peeling after the accelerated corrosion, has been less application.

Heat treatment: Tempering HB220-270, hard chromium plating HRC>55

3 Nitride Steel, 38CrMoAl comprehensive performance is superior, the application is more widespread. The general nitriding layer reaches 0. 4-0. 6 mm. However, this material resists corrosion of hydrogen chloride and is low in price.

4 high-temperature alloy material is superior to other materials, the material is not coated, mainly used in injection molding machine halogen-free screw, the material oxidation resistance to corrosion resistance, heat treatment hra55'60.