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News

New spring wire steel grade developed by Sandvik

Sandvik Coromant UK : 07 May, 2004  (Company News)
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 excellent spring characteristics with high fatigue resistance and a low relaxation rate.

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 an excellent 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.

Available in dimensions from 0.20mm up to 1.50mm, Sandvik Santex spring wire can be delivered coated, bright or in the nickel coated condition.

The enhanced properties of Sandvik Santex and its excellent surface finish mean that the new grade has already found applications in loom springs in the textile industry in minimising the effects of resonance. Given the speed of an individual loom - about 20 beats per second, over million in an 8 hour shift - resonance can occur and can lead to spring breakage. Surface defects lead to fatigue cracking and always cause spring breakage if resonance occurs. Sandvik Santex is overcoming this problem.

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