Question

Which of the following statements are true of annealing of steels?            

         1. Steels are heated to 500 to 700°C

         2. Cooling is done slowly and steadily

         3. Internal stresses are relieved

         4. Ductility of steel is reduced

         Select the correct answer using the codes given below:                                   

         (a) 2, 3 and 4                  (b) 1, 3 and 4

         (c) 1, 2 and 4                  (d) 1, 2 and 3