After joining the WTO, automobiles as a means of transportation and transportation, especially cars have been increasingly developed in terms of safety, reliability, energy saving, environmental protection, and streamlined beauty. The braking system and steering system of automobiles are automobile safety, The key system for reliable driving. Therefore, the automobile brake pipe is the key part of the automobile brake system to transmit the braking force, and the fuel pipe is the delivery pipeline of the fuel required for the automobile driving. Automobile brake pipes In the 1970s and 1980s, most of the automobile brake pipes in my country were made of copper pipes and seamless steel pipes to make automobile brake pipes. Although the copper pipes have the advantages of corrosion resistance and easy bending, they Copper pipes have low fatigue resistance, are easy to break and explode.