The temperature and time of heat treatment of oil quenching-tempering spring steel wire are determined by the thickness of wire diameter. As for the oil hardening-tempering spring steel wire winding after a few hours to go to the stress tempering does not make a hard and fast rule, generally after the spring winding should go to the stress tempering within 12 hours. For hot coils and annealed springs, the spring quenching and tempering interval should be completed within the specified time! Otherwise the consequences are serious.