As a car exhaust pipe, 304 stainless steel would be better. Because the maximum temperature at the exhaust port of the car engine cannot reach 650 degrees. 409, and 304 all meet the requirements. However, 304 has good corrosion resistance. In terms of price, 304 stainless steel is also more than twice that of 409.
409 stainless steel exhaust pipe:
Advantages: 409 stainless steel has good corrosion resistance, especially good durability in high temperature and high humidity environments. It also has high wear resistance and thermal fatigue resistance, and can withstand high temperature and high pressure in the exhaust system. In addition, 409 stainless steel is relatively economical and suitable for general automobile exhaust systems.
Disadvantages: Compared with 304 stainless steel, 409 stainless steel has lower corrosion resistance and oxidation resistance. It has weaker resistance to acidic environments and chlorides, so it may rust and corrode in some harsh environments.
304 stainless steel exhaust pipe:
Advantages: 304 stainless steel has excellent corrosion resistance and oxidation resistance, and can maintain good performance in a variety of corrosive media and harsh environments. It also has high strength and heat resistance, and can withstand high temperature and high pressure requirements. 304 stainless steel is widely used in high-end and high-performance automotive exhaust systems.
Disadvantages: The cost of 304 stainless steel is relatively high, which may be too expensive for general automotive exhaust systems. In addition, 304 stainless steel may be sensitive to certain acidic environments and chlorides, and requires proper maintenance and care.
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