Spring manufacturers teach you the choice of spring materials

The choice of spring materials should be determined according to the nature of the load borne by the spring, stress state, stress size, working temperature, environmental media, service life, requirements for electrical and magnetic conductivity, process performance, material sources and prices.

When determining the shape and size of the material section, priority should be given to the series size specified by national standards and ministerial standards, and non-standard series specifications should be avoided as far as possible.

Medium and small springs, especially spiral tensile springs, should be prioritized with strengthened steel wire, lead bath and other warm drawn steel wire and oil quenched tempering steel wire, with high strength and good surface quality, fatigue performance is higher than ordinary quenched tempering steel wire, simple processing, good process, stable quality.

The carbon spring steel wire and piano steel wire produce large residual stress after cold drawing, after processing the spring, there is a large residual stress, after tempering the size change is large, it is difficult to control the dimensional accuracy. Oil quenching tempering steel wire is modulated and strengthened after the steel wire is drawn to the specified size. Basically, there is no residual stress. After the molding spring is tempered at low temperature, the size changes are small, and the heat stability is better than that of cold drawn steel wire.

Large and medium-sized springs, for high load accuracy and stress should be selected cold drawn materials or cold drawn polished steel. For springs with low load accuracy and stress, hot-rolled steel can be used.

The material cross-section of the helical spring should be preferentially selected as a circular cross-section. Square and rectangular cross section materials have strong bearing capacity, good impact resistance, and can miniaturize the spring, but the material source is less. And the price is high, in addition to special needs, generally try not to choose this material. In recent years, the use of round steel wire flattening instead of trapezoidal steel wire has been developed, and good results have been achieved.

Spring materials that work at high temperatures require good thermal stability, resistance to relaxation or creep, oxidation resistance, and resistance to certain medium corrosion.