In modern life, automobiles are not only one of the most important means of transportation in industry, agriculture, or all walks of life, but also one of the most important tools of activity in human daily life. During use, automobiles often work in extremely harsh environments, with heavy loads, high speed, high vibration, and high dust, and often exposed to sunlight and rain, and the working temperature is very different. Gold cover, put forward more stringent requirements.

So, what are the basic requirements for automotive sheet metal for metal materials?

1.Good mechanical properties
Because the car is often at high speed, heavy load, and frequent vibration during work, it must have sufficient strength, suitable hardness, good toughness, and good anti-fatigue performance for automobile sheet metal parts to ensure the normal operation of the car It is not deformed and damaged in order to meet the needs of transportation.

2.Good chemical stability
Most automobile cover parts work in the open air environment, often in contact with water and steam, especially like a muffler, often work at higher temperatures and corrosive gases. This requires that sheet metal parts must have good chemical stability, which not only requires corrosion resistance and strong rust resistance at normal temperature, but also does not corrode and deform under high temperature or sun exposure.

3.Good process performance
In automobile manufacturing and repair, the shapes of many sheet metal structural parts are very complicated. In order to avoid the difficulty of sheet metal work, it is required that the sheet metal material must have good process performance, that is:

(1) Sheet metal materials must have good pressure processing performance to ensure the smooth forming of sheet metal workpieces, that is, good plasticity. Have the ability to produce permanent deformation under the action of external forces without being destroyed. For cold-worked parts, there must be good cold plasticity, such as stamping parts for automobile parts; for hot-worked parts, they must have good thermoplasticity, such as hot-forged spring steel plates and hot rivets.
(2) Good solderability. Many automotive sheet metal parts are welded together by spot welding, oxygen welding, arc welding, or gas shielded welding, etc., so sheet metal parts are required to have good welding performance. This point is particularly important in automotive repair and repair. Materials with good weldability have high welding strength and low tendency to crack.

4.Good dimensional accuracy and intrinsic quality
The dimensional accuracy and inherent quality of sheet material have a great impact on sheet metal processing, especially on molded parts. The specific requirements are:
(1) High dimensional accuracy, uniform thickness and no deformation.
(2) The surface is flat, and the finish is high, and there are no defects such as bubbles, shrinkage holes, scratches and cracks.
(3) No serious rust and scale attachment.
(4) Uniform structure, no obvious difference in crystal structure and hardness.

5. Low price, economical and practical
For any component of the car, economic conditions should be considered when working conditions are met. Ferrous metals can be used without ferrous metals; precious metals can be used without ferrous metals. The life of automobile sheet metal components should be compatible with the life of other automobile components.

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