Forged steel rolls are widely applied to hot rolling mills and cold rolling mills. The forged steel rolls for hot mills are manufactured by forged steel blanks with special heat treatment is applied to make rolls in satisfactory barrel hardness and hardening depth. The forged rolls for hot mills have good wear-ability, high toughness and excellent biting ability. The forged steel rolls for cold mills are widely applied to work rolls, intermediate rolls and back up rolls. The good performance of Lonsun rolls thanks to the high and homogeneous hardness in the work layer with superior wear ability, high toughness and excellence resistance to accident, and the depth of hardness layer may be over 30mm.