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(KODEST)Aging period of baking hardened steel
dgkede
2025-07-18
With the development of the automotive industry, reducing vehicle weight, improving safety, lowering energy consumption, and minimizing environmental pollution have become the development trends of modern automobiles. Improving the strength of automotive steel plates is an effective way to reduce the thickness of steel plates, reduce vehicle weight, and thus lower energy consumption. In recent years, the use of high-strength steel plates has been on the rise in the design of new car models.
Bake hardening steel has the characteristic of bake hardening, which can improve the anti dent performance of parts. In the process of lightweighting automobiles, automobile manufacturers have taken advantage of this advantage, making bake hardening steel widely used in the production of automotive exterior panels. At present, almost all car models use high-strength steel for their exterior panels, hood panels, and trunk lids, most of which are cold-rolled ultra-low carbon baking hardened steel. However, due to the presence of solid solution C or N atoms in steel, baking hardened steel also exhibits aging characteristics. At a certain temperature, with the increase of time, the diffusion of solid solution C or N atoms leads to a decrease in the formability of steel. The higher the temperature and the longer the time, the more prone the material is to aging.
After aging, the material is prone to slip lines after stamping, which can affect coating and seriously lead to stamping cracking.
Based on Baosteel's experience in the production and testing of bake hardened steel and literature records, bake hardened steel should be used up within 3 months after manufacturing to avoid surface defects.
REPORT