Mainly used for various hardenediron blade repair welding.
主要用于各种淬火后铸铁的刃口修补焊接。
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Some believe that the hardened gray iron used to make the components simply "fatigues" with age-as metal parts that go through millions of stress reversals eventually do.
To reheat hardened steel or hardened cast iron to some temperature below the eutectoid temperature for the purpose of decreasing hardness and increasing toughness.