Spring The most widely used material is Spring steel (SUP), and other steel or copper alloy wires listed in Table A depending on the purpose of use.    
Table A is generally used for materials of spring    ;
Species category JIS number symbol   
Spring Steel G 4081 SUP   
Hard steel wire G 3521 SW   
Musical cord G 3522 SWP   
Oil tempered steel wire — —   
Stainless steel wire G 4309 SUS—WH   
Brass wire H 3521 BsW   
Copper-nickel wire H 3721 HSWS   
Phosphor bronze wire H 3751 PBW   
Beryllium copper wire H 3803 BeCuW  

A. Carbon steel and alloy steel: When manufacturing spring, metals such as silicon, manganese, chromium, vanadium and molybdenum are often added The element is added to the steel to increase the elasticity and fatigue limit of the spring and make it resistant to impact.    
a. Large spring are mostly hot-worked, that is, the spring material is rolled into a rod at a high temperature, and then processed at a high temperature and then quenched. Oil or water at 780°C ~ 850°C, and then tempered at a temperature of 400°C ~ 500°C.    
b. Small spring are annealed first, then cold worked, rolled and then hardened and tempered, such as Steel wire, piano wire or steel belt.    
c. The piano wire is made of high-carbon steel (0.65~0.95%), with less impurities. When the diameter is often less than 1/4, it is drawn into a thread at room temperature after bremming treatment. It has good mechanical properties, high tensile strength and high bremsstrahlung. It is an excellent material for coil spring.    
d. The stainless steel wire is used in places that are susceptible to corrosion. High-speed steel and stainless steel can be used to withstand high temperatures.    
e. The carbon content of the oil tempered wire is 0.6~0.7% should contain manganese, 0.6~1.0% is often used in coil springs ,&Nbsp;  
f. Common steels of 0.9~1.0% are commonly used for leaf springs, and chromium vanadium steel and silicon-manganese steel are used for higher grades.    
2Non-ferrous and non-ferrous alloy steel:   
a. The alloy cannot be hardened by heat treatment, it only needs to be rolled.    
b. Copper alloys for spring include phosphor bronze, brass, etc., which are more flexible than steel and have inferior flame and corrosion resistance Strong, generally used in springs for chemical machines, and because of its non-magnetic relationship, it can be used for springs for electrical measuring instruments.    
c. Monel is an alloy of copper and nickel, which is used in the food industry and is denoted by K.    
d. Inconel (75%Ni, 15%Cr, 10þ) will not slack at high temperatures (within 700°F). It is used in boilers, turbines and jet engines. Spring.    
3. Eraser spring:    span>
a. The function is to absorb vibration and impact movement.    
b. Many resin materials can also be used as spring materials.