Question

how is tempered steel​

Answer 1

Answer:

Tempering, in metallurgy, process of improving the characteristics of a metal, especially steel, by heating it to a high temperature, though below the melting point, then cooling it, usually in air. The process has the effect of toughening by lessening brittleness and reducing internal stresses.

Answer 2

$\huge\underline\mathfrak\color{blue}Answer$

Tempering is a heat treatment technique applied to ferrous alloys, such as steel or cast iron, to achieve greater toughness by decreasing the hardness of the alloy. ... Tempering is accomplished by controlled heating of the quenched work-piece to a temperature below its "lower critical temperature".