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726 |
Metal Annealers, Temperers and Case-Hardeners | Workers in this unit group alter the physical properties of metal objects by heating, cooling and chemical treatment. Their functions include: heating metal objects in a furnace and cooling them at a predetermined rate to relieve internal stresses, restore ductility and refine grain structure; hardening steel objects throughout by heating them in a furnace and quenching them; imparting a hard skin and tough, ductile core to steel objects by treating them with chemicals, heating and quenching or cooling them; reheating hardened steel objects in a furnace and quenching them to relieve stresses caused in performing related tasks. Metal bluer is classified in 7-29.20. |
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