Select material is very important, because the nature of the material will directly affect the quality of the non-standard screws, so you should be careful when select material, below is for said material in all kinds of non-standard screw elements on the properties of the steel impact:
1. Boron (B) : can improve the hardenability and help to produce the expected reaction of low carbon steel to heat treatment.
2. Manganese (Mn) : increases the strength of steel parts and improves the quenching to a certain extent. It increases the strength of the hardened infiltration during the quenching, and the manganese can improve the surface quality, but too much manganese is bad for ductility and weldability. It will affect the control of plating layer.
3. Nickel (Ni) : improve the strength of steel parts, improve the toughness of low temperature, improve the atmospheric corrosion resistance, and ensure the stable heat treatment effect and reduce the function of hydrogen embrittlement.
4. Chromium (Cr) : can improve the hardenability, improve wear resistance, improve corrosion resistance and maintain strength at high temperature. Drlling screw
5. Molybdenum (Mo) : can help control the quenching, reduce the sensitivity of steel to temper brittleness, and has a great influence on the tensile strength of high temperature.
6. Alum (V) : refine austenite grain and improve toughness.
7. Carbon (C) : improve the strength of steel, especially its heat treatment performance, but with the increase of carbon content, the plastic and ductility decreases, and it affects the cold heading performance and welding property of steel parts.
8. Silicon (Si) : to ensure the strength of steel parts, the appropriate content can improve the plastic and toughness of steel.