Detailed introduction

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2018

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08

Common materials for screw


 
Currently commonly used in our countryScrewMaterials are 45 steel, 40Cr, ammoniated steel, 38CrMOAl, high temperature alloy, etc.
1) No. 45 steel is cheap and has good processing performance, but its wear resistance and corrosion resistance are poor.
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 chromium plating layer are high, the coating is too thin and easy to wear, too thick is easy to peel off, but accelerated corrosion after peeling, has been less application.
Heat treatment: quenching and tempering HB220-270, hard chrome plating HRC>55
3) Nitriding steel and 38CrMoAl have excellent comprehensive performance and are widely used. General nitride layer up to 0.4-0.6mm. However, this material has low resistance to hydrogen chloride corrosion and is expensive.
4) high temperature alloy material is superior to other materials, the material does not need coating, mainly used for injection molding machine raw halogen-free screw, the material has high oxidation resistance and corrosion resistance, heat treatment hra55'60