This chapter examines the cooling of steels from the austenite region. It describes the processes of determining the severity of quench. The chapter examines the methods to estimate the quench required if the size and shape of the part are known and the required cooling rate is known. The cooling rate correlation is used to calculate the hardness distribution across the diameter of cylinders. The calculations are used to illustrate the sensitivity of the hardness distribution to the severity of quench and the hardenability. The chapter discusses the methods of determining cooling rates in quenched steel components. It describes...