First slide

General methods of extraction of elements from the earth crust

Question

Tempering of steel

Moderate

A

Increases mechanical strength
B

Changes ratio of iron in steel
C

Involves heating the steel to appropriate temperature and then cooling it rapidly
D

Decreases mechanical strength

Solution

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

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