Question

A heat tempering machine tempers

Answer 1

Answer:

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Tempering furnaces have similarly enabled new capabilities for 'softening' a ferrous metal after the product has been quenched. Iron-based metal products are uniformly heated to temperatures ranging up to 1,650°F (900°C), and are then soaked in a liquid bath or an air furnace.

Explanation:

Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys. Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air. The exact temperature determines the amount of hardness removed, and depends on both the specific composition of the alloy and on the desired properties in the finished product. For instance, very hard tools are often tempered at low temperatures, while springs are tempered at much higher temperatures.