In modern life, automobiles are not only one of the most important means of transportation in industry, agriculture and even all walks of life, but also one of the most important means of activity in human daily life. During use, automobiles often work in extremely harsh environments, with heavy loads, high speeds, high vibrations, high dust, and frequent exposure to the sun and rain, and very different working temperatures. Therefore, stricter requirements are put forward for automobile sheet metal parts, especially sheet metal covering parts.
Good mechanical properties
- Since automobiles are often in a state of high speed, heavy load and frequent vibration during operation, automobile sheet metal parts must have sufficient strength, appropriate hardness, good toughness and good fatigue resistance to ensure that the automobile will not deform or be damaged during normal operation to meet the needs of transportation.
Good process performance
In automobile manufacturing and repair, the shapes of many sheet metal structural parts are very complex. In order to avoid the difficulties of sheet metal work, sheet metal materials must have good process performance, namely:
- 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.
- 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.
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.
