The material of the matrix is ​​65Mn. After the process is heat treated and hardened by cold drawing, the strength is higher, and it has a certain degree of toughness and plasticity. Under the same surface condition and complete hardening, the fatigue limit is equivalent to that of an alloy spring. However, the hardenability is poor, and it is mainly used for springs of smaller size, such as pressure regulating springs, force measuring springs, round and square spiral springs in general machinery or drawn into steel wires as springs on small machinery.

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