Tempering of steel

Annealing of steel is the process of heating steel

Which of the following characteristics of steel are developed by the tempering process?

A steel tape 1 m long is correctly cailbrated for temperature of 27.0^(@)C . The length of a steel rod measured by this tape is found to be 63.0 cm on a hot day when the termperature is 45.0^(@)C . What is the actual length of the steel rod on that day? What is the length of the same steel rood on a day when the temper ature is 27.0^(@)C ? alpha of steel is 1.20xx10^(-5)""^(@)C^(-1) ?

A bar of heated to a tempature of 500^(@) C Its ends are are then clamped at two points 1 m apart and it is allowed to cool .Find the temperate at which at which it will break ,assuming linear expensivity of steel =11xx10^-6) //K, Young's modulus of steel =2xx10^(11) ""Nm^(-2) and braking stress for steel =8xx10^(8) ""Nm^(-2)