In order to cope with the characteristics of "reducing quality, saving energy" and "improving safety"; of automobiles, high-strength steel plates are used in large quantities when manufacturing automobiles. According to the use requirements of various parts of automobiles, high-strength steel plates are mainly used for outer panels, structures and suspension parts of automobiles.
According to international research on ultra-light steel vehicles, steel plates with a yield strength in the range of 210-550n/mm2 are called high-strength steel plates, and steel plates with a yield strength greater than 550n/mm2 are called ultra-high-strength steel plates.
As the strength of various steels increases, the plasticity decreases significantly. Although the plasticity decreases with the increase of strength, various steels have different strengthening mechanisms, and the degree of plasticity decreases at the same time as the strength is increased. Since automobile body parts are mostly formed by stamping, plasticity is an important property of cold-rolled automobile steel sheets. Therefore, steel grades with excellent comprehensive properties of strength and plasticity have become the development trend of high-strength steel plates.
Studies have shown that various types of high-strength steel plates have different uses due to their inherent characteristics. For example, the bake-hardened steel plate has the characteristics of being softer before stamping and forming, good shape stability and high anti-sag performance after baking, which is especially suitable for punching the outer cover of automobiles. Dual-phase steel and phase transformation induced plasticity steel have the characteristics of high strength, high impact absorption energy and high fatigue resistance which are suitable for punching structural parts and safety parts.
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