For QStE500TM, a thermomechanically rolled fine-grain structural steel, the recommended heat treatment is stress relief annealing rather than full annealing or normalizing, which could degrade its thermomechanical processing benefits. According to SEW standard data, components should be heated to 530–580°C and then cooled in still air. The minimum holding time is 30 minutes, though for multiple annealing cycles, the total cumulative holding time should not exceed 150 minutes. A critical process note is that when the holding period exceeds 90 minutes, operators should target the lower limit of the temperature range to avoid over-tempering or reducing the steel's yield strength. This low-temperature treatment is designed to relieve residual stresses from welding or cold forming without significantly altering the metallurgical structure responsible for its 500 MPa minimum yield strength.
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