What are the main types of steel plates used in automobile body applications?

The steel plate used in the automobile body is mainly the steel plate for the body of the body, and the thickness of the cold-rolled and hot-rolled thin steel surface treated steel plate and high-tensile steel plate materials are mainly used, and many accessories for decoration use stainless steel plates. There are two types of steel plates used in the hot-rolled and cold-rolled steel plate industry: one is the steel plate made after high-temperature rolling, which is called hot-rolled steel plate; The other is the hot-rolled steel plate after frequent warm rolling and surface quenching and tempering treatment, which is called cold-rolled steel or polished steel plate.

Hot-rolled mild steel plate is made of steel ingots with low carbon content (C below) and hot-rolled by processing. The appearance of the hot-rolled steel plate does not need to be very aesthetically pleasing. Cold emulsion steel plate has better T-adding and beautiful surface than hot-rolled steel plate, so it is mostly used in automobile bodies, mechanical parts, motors, furniture and other structures with smooth and beautiful surfaces and various parts, and is widely used.

The tensile strength of high-tensile steel plate is more than 6MPa, and it has 2 3 times the failure strength of ordinary mild steel plate. There are many types of high-tensile steel plates, and the one that attracts attention is the composite structure steel plate. This steel plate has a lower yield strength than other high-tensile steel plates, and has a large ductility, so it has good machinability and formability.

Surface treatment steel plate In order to make the body have better corrosion resistance, surface steel plate is widely used to extend the service life of the vehicle. Surface treatment steel plate is a steel plate with a metal layer of zinc, aluminum, etc. on the surface of the steel plate; As well as the cold-rolled steel plate is applied to the film treatment, and then sprayed on it with zinc powder paint, after baking the zinc powder baking paint surface treatment steel plate and so on. Stainless steel plate is a sheet metal material made of chromium and nickel in carbon steel, hot rolled and cold rolled, with good corrosion resistance, smooth and beautiful appearance, and is silvery-white.

Phosphorus high-strength steel refers to the addition of a certain amount of phosphorus in low-carbon steel and ultra-low-carbon steel, the use of phosphorus solution strengthening effect to improve the strength of steel, the use of this steel plate can make the thickness of automobile stamping parts appropriately thinned, can reduce the weight of the car, obtain good economic benefits. It can be used to make external covering parts such as door outer panels, engine cover plates, and top covers, as well as reinforcements and structural parts such as beams and longitudinal beams. Baking hardened steel plate refers to the use of specific chemical composition and production process to make the steel plate solid solution of a certain carbon atom, the steel plate has a low yield strength in the delivery state, after stamping and forming, the yield strength increases when painting and baking, it must be worthy of an efficient automotive steel.

It can improve the anti-denting resistance of the automobile exterior panel, and at the same time has good molding performance. It is widely used in automobile door outer panels, engine cover plates and other outer covers. <>

We can see that there is a large area of rust under the body bracket and at the wheel eyebrows, which is mainly the rust covering the steel plate layer, but fortunately it does not involve the main beam structure of the car body (JAC officially said that the body structure uses 40 high-strength steel plates and 12 extra-high-strength steel plates). For the manufacture of automobiles, the main beam structure of the car body must be forged with steel materials, and other areas can be filled with aluminum, carbon fiber and other materials. For the steel materials of the whole vehicle, the materials used in different parts of the car body are also different, and the steel materials and processes used in different parts of the vehicle include BP steel plate, BH steel plate, DP steel plate, BLA steel plate, TRIP steel plate, etc.

65mn (65 manganese steel.

The classification of automotive steel plate is only a general distinction and definition, which is intended to facilitate the technical exchange and selection of steel plate, and can be divided into the following categories: cold-rolled steel plate according to the rolling process.

Hot-rolled steel plate, hot-rolled pickled steel plate. According to the chemical composition, it is divided into excellent carbon, general carbon, low alloy (MN, TI, NB, SI, MO, CR), and according to the stamping level, it is divided into general, stamping, deep drawing, and ultra-deep drawing. By surface treatment.

It is divided into ordinary steel plate and coated steel plate, and is divided into ordinary strength steel plate, high-strength steel plate, ultra-high-strength steel plate and extra-high-strength steel plate according to the strength level.

There are two types of steel plates: hot-rolled plates and cold-rolled plates. Body steel plates can be roughly divided into carbon steel plates, high-strength steel plates, special steel plates, etc., according to the composition they add.

The specific classification is as follows: - Boiling steel: 05F, 08F, 10F, 15F, 20F stamping parts and structural parts.

Calm steel stamping and structural parts. - Special steels: 08Mn, 16Mn, 06Ti and 10Ti girders.

Mild steel (ST) stamping parts (ST) DC01, DC03, DC04, DC05 and DC06. - Stamping: BLC, BLD, BUSD, BUFD, BSUFD stamping parts.

High strength: BP, BH, BLA, DP, TRIP, stamping and structural parts. - Hot rolled steel:

SAPH (310, 370, 400, 440) structural parts. We can see that there is a large area of rust under the body brackets and on the wheel arches. Here it is mainly the rust that covers the layers of steel plates.

Fortunately, it does not involve the main beam structure of the body (JAC officially said that the body structure uses 40% high-strength steel plate and 12% ultra-high-strength steel plate). Teacher Liao of Guangzhou North Automobile Repair School said that the main beam structure of the automobile body must be forged with steel, and other areas can be filled with aluminum, carbon fiber and other materials. As for the steel of the whole vehicle, the materials used for different body parts are also different.

Let's take a look at the steel materials and processes used in different parts of the next car, including BP steel plate, BH steel plate, DP steel plate, BLA steel plate, TRIP steel plate, etc. The specific classification is as follows: high-strength steel plate:

BP steel plate: B170P1 (340) B210P1 (390) B250P1 (440). -BH Steel Plate:

b140h1(270)b180h1(340)。- DP steel plate: B340 590DPB400 780DP.

BLA steel plate: B340LA (440) B410LA (590). In addition, there are phosphorus high-strength steel, baking hardened steel plate, duplex high-strength steel and low-strength alloy steel plate.

These plates are classified according to different compositions and production processes, and each has different application scenarios. In order to meet different surface requirements, the steel plate can also be divided into different surface quality grades such as FB (03), FC (04), FD (05) and so on. The whole process of building a car is a very complex process, and the car is made up of thousands of parts, and the means of integrating these parts are also different.

But for drivers, the most important thing is that the vehicle in their hands must be fully tested and quality checked to ensure its safety and performance. We are more exposed to the exterior, interior, and components of the car, and the safety performance of the vehicle mainly depends on the internal structure, which is usually difficult to access.

1. Automobile steel plate, which refers to automobile manufacturing, is mainly composed of plates and special steels, with the characteristics of high strength, thin specifications and corrosion resistance, high production technology level, and high value-added products.

2. The steel plate for automobile is divided into hot-rolled steel plate, cold-rolled steel plate and coated steel plate from the characteristics of the production process; From the perspective of strength, it can be divided into: ordinary steel plate, low-alloy high-strength steel plate, ordinary high-strength steel plate and advanced high-strength steel plate. Among the steel plates divided by strength, the first two types of steel grades have become mature at home and abroad. The third type of steel has been commercialized in batches in the world, and it is also in the stage of development, trial and promotion in China; The fourth type of steel grade is in the stage of mature development and popularization and application in the world, and it is in the initial stage of development in China.

3. High technical content. With the continuous improvement of the level of automotive products, the requirements for automotive steel are also increasing. First of all, in order to reduce the weight of automotive products, save materials, reduce fuel consumption, reduce costs, and improve safety standards, it is necessary to use high-strength and thin-gauge steel.

Secondly, in order to improve the anti-corrosion performance of automobile products and prolong the service life of automobiles, it is necessary to improve the surface treatment technology of automobile internal and external panels, such as the use of galvanized sheet or alloy galvanized sheet.