Spring wire steel grade developed

By
Monday, 19 July, 2004

A new grade of stainless steel spring wire has been developed by Sandvik Materials Technology. Designed for applications with a high number of expansion and contraction cycles and where springs must retain their mechanical properties over long periods, the new grade combines good spring characteristics with high fatigue resistance and a low relaxation rate, according to the company.

Called Sandvik Santex, the new steel has been developed from standard grade AISI 302 material (designated also Sandvik 12R10) - a general purpose, austenitic stainless spring steel. The enhanced properties have been achieved by the balanced addition of copper and aluminium, which also produces the additional benefits of a spring material that is ductile, easy to form and has a good surface finish.

Furthermore, it is possible to increase the mechanical strength ie, tensile strength and relaxation properties of Sandvik Santex, with low temperature heat treatment. This high tempering response is due to the material having been developed as a precipitation hardenable steel. Typically a one hour temper will increase tensile strength by 400-500 MPa.

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