The growth of market demand in the special steel industry is mainly due to the rapid growth of the domestic machinery industry and the automotive industry. The development of the automotive industry has affected the steel industry and has also attracted people’s attention. There are many varieties of steel for automobiles, but mainly thin steel plates and high-quality steel profiles. Different models have different steel consumption. The steel consumption of the car is mainly thin steel sheet, accounting for more than 70% of the steel consumption. Heavy goods vehicles consume more quality steel profiles, of which steel plates account for 56%, structural steel accounts for 36%, and steel strips account for 5%.
In the structure of automobiles, trucks currently account for 28% of the total number of vehicles, of which light-duty trucks are developing rapidly, accounting for more than half. Heavy-duty trucks grew moderately, accounting for about 15%. Passenger cars account for 30% of the total number of cars, of which minibuses develop particularly fast, accounting for about 60%, followed by light passenger cars, which are relatively stable, accounting for about 30%. Cars account for 42% of the total number of cars, of which light cars and mini cars have a growing trend. The amount of high-quality steel profiles for Santana ordinary cars is 140.68kgs which accounts for 17.7% of the total steel demand, including 118.74kgs for hot rolled steel products and 21.97kg for cold drawn steel profiles. Among them, carbon structural steel is about 61kgs, which is mainly used to produce various shafts, such as transmission shafts and universal joint shafts. It is also used to produce parts and standard parts. Among them, the transmission shaft has the largest amount of steel, and the various shaft materials for supply and demand are 27.47kg, which accounts for about 45% of the carbon steel. The main steel used is CK45. The chemical composition of CK45 is close to that of 45 steel, but the sulfur content is higher, which can improve the machinability of steel. In the use of spring steel, 50CrV valve springs were used in the past, but the strength is not up to standard, easy to relax, the inner quality and surface quality are extremely poor, and 50% is unqualified. Now use 55CrSi elliptical cross-section steel wire.
Besides the direct use of high-quality steel profiles in the automotive industry, the production of automotive parts requires a large number of tool steel and bearing steel. The spare parts and accessories for maintenance in automotive operations, agricultural vehicles, motorcycles need a large number of special steel. Automobiles, motorcycles and agricultural vehicles are the largest markets for molds. In short, with the rapid development of the automobile industry, with the continuous improvement of the level of localization, the automobile industry as an emerging industry in China, the demand for steel is expanding.
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