Explanation

Specifically, the substrate is woven at 10%? 20% island martensite or bainite strengthening phase and 80%? 90% ferrite phase low-cardon steel, also known as DP steel. The soft phase ferrite determines that the yield strength of steel is very low, while the dual phase occurs f! Due to mutual restraint and proper coordination during deformation, the work hardening velocity is very high. Therefore, dual-phase steel is a steel for stamping with high tensile strength and good cold formability. After finishing rolling of hot rolled dual-phase steel, control cooling to obtain large M ferrite structure (need to restrain pearlite transformation), and then rapid cooling to make the remaining austenite transformation into martensite; The most commonly used cold rolled dual-phase steel gets dual phase structure through rapid cooling after annealing in the critical zone. Dual phase steel is widely used to make complex components formed by cold punching or deep drawing, such as automobile girders, wheel valleys, frames, anti large deformation oil and gas pipelines, etc.

Classification