What is the main material of stainless steel automobile exhaust pipe?

Because of its unique material properties, ferritic stainless steel has become the preferred material for automotive exhaust pipes. The following is about the application of ferritic stainless steel in automotive exhaust pipes:

Ferritic stainless steel has become the preferred material for automotive exhaust pipes: Ferritic stainless steel has gradually become the preferred material for automotive exhaust pipes with its excellent thermal expansion coefficient of small, high thermal conductivity and high temperature oxidation resistance. This material not only performs well in high temperature environments, but also effectively reduces deformation and stress caused by temperature changes, thereby extending the service life of the exhaust pipe. In addition, the cost of ferritic stainless steel is relatively low, making it a high cost performance in automotive manufacturing.

Automobile exhaust pipe material classification: automobile exhaust pipe material is mainly divided into ordinary steel and stainless steel products. Although ordinary steel has a lower cost, it is not as good as stainless steel in corrosion resistance and high temperature resistance. Therefore, stainless steel exhaust pipes have gradually become the mainstream choice.

Advantages of stainless steel exhaust pipe: Stainless steel exhaust pipe has fine, light weight, heat resistance, corrosion resistance and other characteristics. These advantages make the stainless steel exhaust pipe better than the ordinary steel exhaust pipe in terms of aesthetics and performance. In addition, the extremely thin wall of the stainless steel exhaust pipe can reduce weight by about 5kg, which not only helps to improve the dynamic performance of the vehicle, but also reduces fuel consumption.

Performance comparison of different types of stainless steel:

Although the stainless steel of the 200 series is cheap, it has poor corrosion resistance and high temperature resistance and is not suitable for exhaust pipe materials.

201 is not recommended because of its low corrosion and high temperature resistance.

409 is the original material used to make exhaust pipes, the antioxidant capacity is very low, and now gradually replaced by better materials.

430 and 304 are the more common exhaust pipe materials. Among them, 304 stainless steel is especially suitable for hot and humid climate in the south because of its good corrosion resistance and mechanical properties. Although the price of 430 stainless steel is higher, its high temperature oxidation resistance is excellent, and it is suitable for various environmental use.

Properties and Applications of 409 stainless steel: As a ferritic stainless steel, 409 stainless steel contains 11% chromium, which is the minimum amount required to form a passivated surface film, making stainless steel corrosion resistant. Although 409 stainless steel is less than 304 and 430 stainless steel in terms of oxidation resistance, its cost is lower, so it is still used in some occasions where the performance requirements are not particularly high. However, with the development of material technology, higher performance stainless steel materials have gradually replaced the application of 409 stainless steel in the exhaust pipe.

Comparison of 304 and 430 stainless steel: For automotive exhaust pipes, 304 and 430 stainless steel each have advantages. 304 stainless steel because of its excellent corrosion resistance and mechanical properties, especially suitable for hot and humid climate in the south. 430 stainless steel can maintain good service life in various environments because of its excellent high-temperature oxidation resistance. In terms of price, the price of 304 stainless steel is about twice that of 430 stainless steel. Therefore, when selecting the exhaust pipe material, it should be considered comprehensively according to the specific needs and the use environment.

To sum up, ferritic stainless steel occupies an important position in the field of automotive exhaust pipes because of its unique material properties and cost effectiveness. However, with the continuous progress of technology and changes in market demand, more new materials may be developed in the future to replace ferritic stainless steel.