The spring steel (SUP) is the most widely used spring material, and the other steel or copper alloy wires listed in table a are available according to the purpose of use.
Table a is generally used for spring materials
Category JIS number symbol
Spring steel g 4081 sup
Hard steel wire g 3521 SW
Qin steel wire g 3522 swp
Oil tempered steel wire——
Stainless steel wire g 4309 sus-wh
Brass wire h 3521 BSW
White copper wire h 3721 hsws
Phosphor green copper wire h 3751 pbw
Beryllium copper wire h 3803 becuw
A. Carbon steel and alloy steel: when making springs, metal elements such as silicon, manganese, chromium, vanadium and molybdenum are often added to the steel to increase the elasticity and fatigue limit of the spring and make it impact resistant.
a. Large springs are usually processed by hot working, that is, the spring material is rolled into bars at high temperature, and then processed at high temperature, quenched in oil or water at 780 ~ 850 ℃, and tempered at 400 ~ 500 ℃.
b. Small springs are annealed first, then cold worked, rolled and then hardened and tempered, such as steel wire, piano wire or steel strip.
c. Piano steel wire is made of high carbon steel (0.65 ~ 0.95%), with less impurities and diameter less than 1 / 4. After bremsstralization, it is drawn into a line at room temperature. It has good mechanical properties, high tensile strength and toughness, and is an excellent spiral spring material.
d. Stainless steel wire is used in corrosion prone areas, high-speed steel and stainless steel can be used to withstand high temperature.
e. 0.6 ~ 0.7% of carbon content of oil return line should contain manganese, and 0.6 ~ 1.0% is usually used for coil spring,
f. 0.9-1.0% ordinary steel is commonly used for plate spring, and CR-V steel and Si Mn steel are used for higher grade plate spring.
2. Non ferrous and non-ferrous alloy steels:
a. The alloy can not be hardened by heat treatment, only rolled.
b. Copper alloys for springs include phosphor bronze, brass, etc., which are inferior to steel in elasticity and corrosion resistance. They are generally used in springs for chemical machines and also for springs for electrical measuring instruments due to their non-magnetic properties.
c. Monel is an alloy of copper and nickel, used in the food industry, denoted by K.
d. Inconel (75% Ni, 15% Cr, 10 ° C) has no relaxation at high temperature (within 700 ° f). It is used in boilers, turbines and jet engines.
3. Rubber spring:
a. Its function is to absorb vibration and shock motion.
b. Many resin materials can also be used as spring materials.