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Spring steel strip 

The spring is a flexible elastic object used to store mechanical energy. Springs are usually made out of hardened steel. Small springs can be produced from pre-hardened (hardened and tempered) stock, while larger ones are made from annealed steel and hardened after fabrication. Spring Steel Strip is quite literally, steel used in the production of springs. This range of steels normally contains between 0.40% and 0.80% carbon, with alloying elements added for the higher integrity products such as automotive clutches etc. Coil springs are normally produced from steel wire, whilst steel strip is used for the production of flat springs. Spring steels are also used in a number of applications where hardness or resistance to bending is required, such as lock parts or tools.