1. Stainless steel is one of the development trends of automotive steel.
China's automotive high-quality steel accounts for about 30% of automotive steel, and steel accounts for about 25% of production costs. Low fuel consumption, lightweight, low emission pollution, and safety have become the development trend of the automotive industry today.
In recent years, stainless steel will become a potential new lightweight material. Although stainless steel has not been used in automobile manufacturing for a long time, it is mainly used to manufacture stainless steel automotive fittings of engines, and the use of lightweight materials for the testing and trial production of structural parts is a trend.
2. Ferritic stainless steel for automotive exhaust parts
The type of stainless steel used in the exhaust system. Choose steel grades according to the working conditions of auto parts. Austenitic 304 (06Cr19Ni10) is a conventional stainless steel. Compared with austenitic stainless steel, ferritic stainless steel has low production cost, a small linear expansion coefficient, and large thermal conductivity. In recent years, 80% of stainless steel for automotive exhaust parts has been made of ferritic stainless steel. Ferritic stainless steels have better high- temperature performance than austenitic stainless steels and are also inexpensive.
In many cases, automotive exhaust systems are designed to be complex in shape to accommodate a limited body space, fasteners are preferred for heat resistance, the second consideration is high formability, and many auto parts companies are strongly demanding the development of stainless steel that combines the advantages of both kinds of steels. Specifically, this means developing an austenitic stainless steel having high heat resistance (high- temperature strength, high-temperature fatigue property, and thermal fatigue property) equivalent to or superior to SUS444, and high forming property similar to 304.