Hardened skin with the objective is to make it as specific hardness surface only. Best solid surface under the iron content area until the middle of the original steel body, which is still soft and sticky. Intention to want to wear resistant steel. While the resistant torque or severely impact well without fracture occurs, is considered to be a very interesting process, hardened. In the field of economical and mechanical parts are of good quality, as well as surface hardness and strength. Examples of popular mechanical parts are surface hardened shaft the shaft to hurl around the tongue. Gear, gear, and so on.
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