一、前言从小汽车外装板的耐久轻微变形性能来看,在板厚一定的条件下,屈服应力越大性能越好;但是,就其冲压成形性来说,屈服应力越小就越好。因此,除要求外装板具有迟时效、高 r 值的冷轧板外,尚要求在冲压成形后烤漆过程中,屈服应力具有增加上升的性能,即所 First, the foreword From the automotive exterior plate durability slight deformation performance point of view, under the conditions of certain thickness, the greater the yield stress, the better the performance; However, its stamping formability, the smaller the yield stress, the better. Therefore, in addition to the requirements of the exterior board with a late aging, high r value of the cold-rolled sheet, it is required in the baking process after stamping, the yield stress has increased performance, that is