What is the spring material S20C, SWB? Who can tell me in detail.

High-quality carbon structural steel S20C

Execution standard: JIS G4051-2005

Characteristics and scope of application: Slightly higher strength than No. 15 steel, rarely quenched , no temper brittleness. It has high cold deformation plasticity and is generally used for bending, rolling, flanging and hammer arching. It has good welding performance in arc welding and contact welding. The thickness is small during gas welding, and cracks are prone to occur on parts with strict appearance requirements or complex shapes. The cold drawn or normalized state has better machinability than the annealed state, and is generally used to manufacture parts with low stress and high toughness requirements.

Corresponding steel number: my country's GB/JB standard steel number is 20, my country's Taiwan CNS standard steel number S20C, Germany's DIN standard material number 1.0402, Germany's DIN standard steel number CK22/C22, British BS standard steel IC22, French AFNOR standard steel number CC20, French NF standard steel number C22, Italian UNI standard steel number C20/C21, Belgian NBN standard steel number C25-1, Swedish SS standard steel number 1450, Spanish UNE standard steel number F.112 , American AISI/SAE standard steel number 1020, Japanese JIS standard steel number S20C/S22C.

Phase transformation point temperature (approximate value) Ac1=720-845℃, Ar1=815-730℃

The standard temperature for softening treatment of cold pressed blanks is 700-720℃, and the holding time is 8- 15h, with a cooling rate of 50-100℃/h, reduce the temperature to ≤550-600℃, and air-cool when it comes out of the oven.

The hardness before treatment is ≤143HBS, and the hardness after treatment is ≤131HBS.

Normalizing specifications: temperature 870-920℃, air cooling after coming out of the furnace.

Annealing specifications: temperature is about 860℃, air cooling after coming out of the furnace.

Quenching specification: temperature 910℃±10℃, 10NaCl salt water cooling

SWB is a carbon steel wire