Where high resistance to corrosion is required, one of the stainless steels should be specified. These fall into two categories.
(a) Martensitic. These steels are mainly used for flat springs with sharp bends. They are formed in the soft condition and then heat-treated.
(b) Austenitic. These steels are cold-worked for the manufacture of coil springs and flat springs, with no severe forming operations.
Both materials are used in service up to about 235°C.
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