... ,nuts, rivets and bolts, moulds, worms and cylinders for the processing of plastics, press dies and die inserts, rolls ... forming: 900 - 1100 °CHardening: 1020 - 1080 °CQuenching media: Oil, Salt bath ( 500 - 550 °C ), AirHardness after quenching: 52 - 56 ... HRC Oil, Salt bath; 50 - 54 HRC AirHardness after tempering: Tempering °C400500550600HRC54555450 H13 ...