The recrystallization temperature of steel is

Explanation:

Recrystallization: 

• Recrystallization temperature is a temperature at which 50 % cold-worked metal is recrystallized in 1 hour.
• It occurs generally between the temperature range 0.3–0.5 T_m . where T_m is the melting point in Kelvin.
• During recrystallization, a new set of strain-free and equiaxed grains form that have relatively low dislocation densities.
• The metal becomes softer, weaker, and more ductile.
• The driving force for recrystallization is the difference in internal energy between strained and recrystallized material.

Two factors that influence the recrystallization temperature are percent cold work and impurity content.

• Recrystallization temperature rises with increasing concentrations of impurities.
• The recrystallization temperature for steel is 800°C so the correct answer is option 3
• The recrystallization conditions, such as heating rate and soaking time depend on the degree of cold work and the steel composition.