From the high strength, light weight, details, the difference between ordinary cars and high-end cars
The difference between ordinary cars and high-end cars is like an ordinary swordsman and swordsman. The martial arts people pay attention to both the gods and the shape, the bones are amazed, and they can reach the highest place after continuous tempering. Bone is the foundation for swordsmanship to be fully swayed, while the "bone" of high-end cars is the body-in-white. Many people will be curious about such a thing: 100,000 and 1 million cars, what is the difference between their bodies? How to evaluate the body-in-white of a car, as a body-in-white engineer, I want to talk to you from the three points of high strength, light weight and perfect details. Master, to fight The strength of the body-in-white steel is one of the important indicators to measure the safety of the car. In high-end cars, the use rate of high-strength steel tends to be relatively high. According to incomplete statistics, the high-strength steel of high-end cars, especially large-displacement vehicles, accounts for about 70%, while the average ordinary cars are generally around 50%. Due to the poor processability of high-strength steel, the processing cost is generally about 20% higher than that of ordinary steel. It is easy to cause misunderstanding that high-strength steel is only a category and can be divided into ordinary high-strength steel (C-Mn steel, BH steel, IS steel, HSLA steel) and advanced high-strength steel (DP, CP, TRIP, M, HF). The use of advanced high-strength steel in many high-end cars will exceed 30%, while ordinary cars will be stretched, which is why many manufacturers rarely mention high-strength steel models in their ordinary models. In addition, an important feature of high-strength steel is that the heat-affected zone has a large tendency to harden. As the strength grade increases, the content of carbon-containing elements or alloying elements increases, and the hardenability increases, which results in a better weld quality. Great impact. Compared with ordinary cars, the welding process of high-end cars tends to be more advanced, and the control requirements will be more stringent. This invisibly further expands the advantages brought by materials. Of course, the corresponding welding and control costs are also improved. It is said that under the same structure, the cost of high-strength steel will be about 30% higher than that of ordinary steel. This is the same concept as the processing cost mentioned above. It can be seen that the use rate of high-strength steel in high-grade cars and the welding process capability will be higher. In addition, since high-grade cars will use more reinforcing materials in certain parts, such as aluminum alloy and carbon fiber, this further enhances the car's Safety performance and the lightweighting that will be discussed below.
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