Application of high strength steel in auto parts shared by rolling parts manufacturers
A large number of facts have proved that the use of advanced high-strength steel has become a competitive and effective measure for automobile lightweight, because it has the following advantages:
High strength steel has a wide range of strength grades; The body adopts high-strength steel plate, which can reduce parts and weight, so as to reduce consumption; Compared with magnesium, aluminum and other materials, the greenhouse gas emission of producing advanced high-strength steel is low, only 1 / 6 of aluminum and less than 1 / 8 of magnesium; High strength steel meets the requirements of improving vehicle collision safety and driving stability;
Advanced high strength steel provides a better way to reduce weight and optimize performance. Dual phase steel has a good combination of strength, formability and weldability. The combination of these advantages and the cost advantage of cold bending makes AHSS suitable for automobile body structural parts and safety parts, which has an attractive application prospect.
Part forming technology
Nowadays, the application proportion of high-strength steel in foreign auto parts manufacturing is increasing. Advanced high-strength steel manufacturing technologies mainly include laser welding technology, hydraulic forming technology, stamping technology and cold forming technology, among which automotive stamping parts occupy a large market. However, it is found that cold bending process has greater advantages than stamping process.
Compared with deep drawing parts, rolling parts have the following advantages: low tool cost; Cold bending can form higher strength steel; It has good flexibility and can produce products of different lengths and thicknesses
Weight loss effect
High strength steel is closely related to the lightweight of parts. The use of high-strength steel plate can reduce the thickness and weight of the plate under the design conditions of equal strength and load.
High strength steel plate can be used in automobile body manufacturing to improve the collision absorption energy of parts and prevent plastic deformation. With the increase of strength of dual phase steel, the impact absorbed energy also increases. Therefore, from the perspective of energy absorption by collision, the higher the strength of the material, the more obvious the weight reduction effect. When the tensile strength of steel is doubled, its thickness and weight can usually be reduced by 30% under the condition of absorbing the same energy.
Under the pressure of automobile lightweight, energy conservation and emission reduction, using high-strength steel instead of ordinary strength steel and automobile rolling parts instead of stamping parts is the development trend of modern automobile parts. Compared with stamping forming, rolling forming has more significant advantages in processing high-strength steel with high strength grade. Therefore, in order to improve the strength and competitiveness of domestic automobile enterprises and meet the needs of domestic automobile energy conservation and environmental protection, it is urgent to develop more advanced automobile rolling forming technology.