What are the material composition factors of Extension springs?

What are the material composition factors of Extension springs?

Extension spring is a helical spring that bears axial tension. Springs made of different materials have different qualities. Different types of springs are also made of different materials, so its strength and surface quality are also different. The main materials commonly used in Extension spring are carbon spring steel, which is relatively cheap, but has a low elastic limit; low manganese spring steel has good strength and hardenability, but it is prone to cracks after quenching; silico-manganese spring steel , The elastic limit has been improved, and it also has good mechanical properties; chrome vanadium steel, toughness and strength are relatively good, and the price is slightly more expensive.

1. Material factors: Springs usually choose 55SiMnVB, 55SiMnMoV, 55Si2Mn, 60Si2MnA, 60CrMnB, 60CrMn and other grades of flat steel, large and medium-sized springs. For high load accuracy and stress, cold drawn materials or cold drawn polished steels should be used. ; Springs that work in acid contact with other corrosive media usually use corrosion-resistant materials such as stainless acid-resistant steel or nickel alloy.
 
  2. Intensity of characteristic factors: The level of hardness has a great relationship with plane strain fracture toughness. Therefore, its selection should be determined according to the nature of spring load and stress.
 
  3. Spring materials that work at high temperatures due to temperature factors: require good strength, thermal stability, relaxation or creep resistance, oxidation resistance, and corrosion resistance to the necessary medium. Spring materials used at low temperatures should have good low temperature toughness.
 
   Extension springs are generally of equal pitch, and the cross section is mostly circular. When the extension spring is not under pressure, there is no gap between each circle and each circle, and the connection is very compact. Extension spring has a very wide range of applications. In medical treatment, not only respiratory equipment, mobile equipment, motion control, but also some home care equipment are used, mechanical and electronic protection hardware, actuators, hand tools, and some machinery Extension spring is used for switch devices.
 
   Different materials can make different spring styles, and different uses also determine the selection of Extension spring requirements. Therefore, it is necessary to suspend a suitable spring according to the required application.