2.1, smelting technology
The use of furnace refining and electromagnetic mixing with the casting process. Mainly in the steel of C, Si, Mn, Cr, Mo and other major elements of the control in a small range, and as much as possible to reduce the steel P, S, 0, N and other impurities, to achieve high purity steel, Non-metallic inclusions are low and the segregation level is low, thereby improving the cold heading performance of the steel and improving the surface quality of the steel.
2.2, rolling technology
A high-speed, high-precision rolling process with controlled dairy and controlled cooling is used to obtain hot-rolled wire rods with good dimensional accuracy and as little surface defects as possible.
3, automotive fasteners steel status and development direction