Strain Hardened

To increase hardness and strength by (a) cold working of raw material by a steel mill or (b) cold forming by a fastener manufacturer can sharply increase tensile strength and hardness, so that ordinary material from a steel mill may often be used. However, fasteners that are milled from bar will decrease in strength and hardness, so that raw material would need to be strain hardened by a steel mill before milling fasteners.

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