Why to replace the galvanized sheet on the car with the common cold-rolled sheet
As early as 2003, at a meeting of the steel industry, people in the home appliance industry said that the home appliance industry did not use cold-rolled sheet for a long time. The price of cold-rolled sheet is between 6500-6800 yuan per ton, and that of hot-rolled sheet is about 4500 yuan. Obviously, it is also to reduce the cost. The use of hot-rolled sheet does not affect the performance of household appliances.
In the automobile industry, there are similar situations. For example, in order to reduce the cost, the steel plate used for car body is changed from galvanized plate to ordinary cold-rolled plate. The price per ton of galvanized plate is about 7500 yuan, 1000 yuan higher than that of cold-rolled plate. Glass, rubber, plastic and other materials have similar situation. Also reflect that some models will change the four disc brake to the front disc and rear drum. There are more than 20000 parts in a car, and the prices of some parts from different suppliers can vary by ten times, so there is too much room for the car to reduce costs. The question here is: will it affect the performance of the car? It is said that the four disc brake will not affect the brake performance, reduce some expensive and impractical configurations, or affect the normal use of the car. But there are also changes that cause quality problems. For example, last year, some models had the phenomenon of "falling slag" on the steering wheel. In fact, they used cheap raw materials and the performance was not guaranteed. Some changes are hard to say. For example, the use of galvanized sheet is to improve the anti-corrosion performance of the car body. With proper process treatment, it can ensure that the car body will not rust for 12 years. Generally, cold-rolled sheet can not achieve this effect. But how many cars in China can drive for 12 years? So the impact of doing so is not visible for a short time.
At present, there is also a trend in the world, which is to make cars with more expensive materials. In order to reduce vehicle weight and fuel consumption, BMW, Audi and other companies began to use aluminum to make car body and frame, magnesium to make engine shell, and magnesium to make wheel hub. The application range of plastic parts is also growing, and even expensive carbon fiber is used in car racing.
In order to reduce the cost, most of the economic vehicles in China have low safety configuration, few of which are equipped with side airbags, wheel driving force control, electronic stability devices, etc. According to Bosch, the installation rate of China's automobile electronic stability control system (ESP) is only 3%, and the United States has reached 70%.
Some people describe the main measure to reduce the cost of automobile enterprises as "retro", which is to say that mature technology, or a large number of popular technology, can meet the basic performance requirements, but the cost is very low. The car brand of * in the first half of 2006 is Xiali. This year's top two brands are Santana and Jetta. The old products are not old, but the new stars can't replace the old brand products. When the "dross" has disappointed consumers, it's still the old products that have been tested for a long time to be reliable.
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steven xu