Large-scale spring forming heating and quenching heating, mostly using flame furnace or electric furnace. In order to prevent or reduce surface oxidation and decarburization, a higher surface quality is obtained, and a furnace capable of controlling the atmosphere is preferably used, or the atmosphere in the furnace is slightly reduced, and a high-temperature rapid heating method is employed. For medium and small springs, quenching heating can be carried out using a salt bath furnace with good d...
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