When hard steel is heated to bright rednce reduce and then allowed to cool slowly, Its hurdness harthess decreases and softwere increases ,The process is called

Options

A. annealing
B. quenching
C. tempering
D. hadening

Answer

a

Explanation

Amealling is very slow regulated cooling eqecially of metal, to releve strains set up during heating or other reament , when mild steel is heated in a high temperature and suddenly placed into cool water is heated to ahigh temperature and stadenly planced is called quenching (thus qucacting of steel is rapal cooling by immerision into water or all , to hardeb the steel )
Tempering of steel is imperting is defialite degree of hartyhese to steel by heating to a definite temperature (which is sometimes determined by the collor the steel assumes) and then quenching i.e. cooling in oil or water
Unike steel , cast and wrought iron cannot be tempered , however unike steel , wrong iron (more easily) and cast iron can be weided unike cast iron, steel can be permanemly magmetized wrought iron is very to magnatine but the magnetration is not permatment