Common materials of cold formed springs
Common materials of cold formed springs ,such as compression spring, torsion spring, tension springs,can be divided into the following types according to different kinds of heat treatment processes.
The first type is the material that does not need quenching and only needs stress relief annealing after spring forming. This kind of material is mainly reinforced steel wire, including carbon steel wire, piano steel wire, stainless steel wire for spring and various oil quenched and tempered steel wires.
The second type is the material that only needs aging treatment after spring forming, including beryllium bronze wire, alloy for spring components, etc.
The third type is the material to be quenched and tempered. These materials are mainly annealed and hot rolled materials, such as hot rolled spring steel wire, silicon manganese spring steel wire, chromium vanadium spring steel wire, chromium silicon spring steel wire, etc.
With the development of metallurgical industry and the continuous improvement of spring performance requirements, in order to reduce equipment investment, reduce production cost, shorten production cycle, improve product quality and economic benefits, the material that only needs stress relief annealing after forming should be selected in design and manufacturing, that is, the first type. Materials that must be quenched and tempered after winding forming, that is, the third type shall not be used as far as possible.
The second type that needs aging treatment (hardening and tempering treatment) after forming is more used for springs with special requirements, such as corrosion resistance, weak magnetic field, conductivity and so on.
