1. The car beam is the main load-bearing part of the freight car, which bears almost all the weight of the goods. The quality of the girder affects the service life and driving safety of the whole vehicle. Automobile beams are generally manufactured by stamping process, and their deformation mode is mainly bending.
Therefore, the beam and slab have higher requirements for formability, that is, the automobile beam steel plate must have good comprehensive properties, sufficient strength and toughness, good fatigue resistance and cold formability.
2. With the development of automobile industry, high-strength steel plates that can reduce weight and improve safety, and new products with excellent strength and formability are the main demand and development direction of automobile plates.
3. In order to improve the bearing capacity of automobile, prolong the service life of automobile and meet the requirements of energy saving, material saving and safe driving, it has become the development trend to produce automobile beam steel with low alloy, high strength and ultra-high strength steel plates.
Extended data
development status
Low alloy high strength beam slab is also called ferrite-pearlescent low alloy high strength beam slab. At present, this kind of steel is the most widely used beam and slab. Its main chemical components are low carbon, slightly high manganese and proper amount of silicon, and microalloyed elements such as nickel, vanadium and Qin are added separately or in combination. The required strength and plastic toughness are obtained by strengthening mechanisms such as solution strengthening, precipitation strengthening and grain refinement.
In 1990s, with the development of automobile industry and the improvement of traffic conditions, it has become the trend of automobile development to reduce its own quality, improve its effective load capacity and reduce its production cost. Therefore, many microalloyed ultra-high strength automobile beam steel plates have been developed.
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