1. Good mechanical properties

2. Good process performance

(1) Sheet metal materials must have good pressure processing performance to ensure the smooth forming of sheet metal workpieces, that is, good plasticity. They must have the ability to produce permanent deformation without being destroyed under the action of external forces. For cold-worked parts, they must have good cold plasticity, such as automobile parts stampings; for hot-worked parts, they must have good hot plasticity, such as hot-forged spring steel plates, hot-riveted rivets, etc.
(2) Good weldability. Many automobile sheet metal parts are welded together by spot welding, oxygen welding, arc welding or gas shielded welding, so sheet metal parts must have good welding performance. This is especially important in automobile repair and repair. Materials with good weldability have high welding strength and low cracking tendency.
3. Good chemical stability
Most automobile covers work in open-air environments and are often in contact with water and steam. Especially mufflers, they often work at high temperatures and corrosive gases. This requires sheet metal parts to have good chemical stability, which requires corrosion resistance and strong rust resistance at room temperature, and no corrosion or deformation under high temperature or sun exposure.