Heat resistance is a crucial consideration when selecting exhaust pipe mold materials. The exhaust pipe is directly exposed to the high-temperature exhaust gas environment emitted by the engine, so the selected material must be able to withstand extremely high temperatures and should not deform or damage under such conditions. Although traditional heat-resistant materials such as cast iron and cast steel have certain heat resistance, they may still encounter problems such as thermal expansion and thermal fatigue in extremely high temperature environments. Therefore, modern exhaust pipe molds prefer to use high-heat-resistant alloy materials, such as titanium alloys and nickel-based alloys. These materials can not only maintain stable physical properties in high-temperature environments, but also have excellent resistance to thermal corrosion and thermal fatigue, thereby significantly extending the service life of the mold.

In addition to heat resistance, corrosion resistance is also an important consideration in the selection of mold materials. The exhaust gas in the exhaust pipe has a complex composition and contains a variety of corrosive substances, such as sulfur and nitrogen oxides. When these components come into contact with the mold material, they may cause chemical reactions, resulting in corrosion, wear and even failure of the mold surface. Therefore, it is particularly important to select materials with excellent corrosion resistance. Stainless steel and titanium alloys are ideal choices for exhaust pipe molds due to their excellent chemical stability and corrosion resistance. These materials can maintain the smoothness and precision of the mold surface in harsh exhaust environments, ensuring the smooth operation and efficient discharge of the exhaust pipe.

In the selection of mold materials, strength and toughness are two other key factors that cannot be ignored. In actual work, the exhaust pipe mold needs to withstand the huge pressure and impact force from the engine exhaust gas, so the selected material must have sufficient strength and toughness to resist the influence of these external forces. High-strength and high-toughness materials can effectively prevent the mold from deformation, cracking and other failure phenomena during long-term use, thereby ensuring the dimensional accuracy and shape stability of the exhaust pipe. In addition, the toughness of the material can also improve the mold's resistance to impact loads and further extend the service life of the mold.

Processing performance is also an aspect that cannot be ignored in the selection of mold materials. High-quality mold materials should have good processing performance to facilitate the manufacture of high-precision and high-quality exhaust pipe molds. This includes the material's cutting performance, welding performance and heat treatment performance. Easy-to-process materials can not only reduce the manufacturing cost of the mold, but also improve production efficiency. At the same time, good processing performance ensures that the mold maintains high precision and consistency during the manufacturing process, thereby meeting the strict requirements of the automotive manufacturing industry for exhaust pipes.