Abstract
The change of strength, toughness and residual stress of Q690 cold-drawn tube were studied under (400˜;600)°C and heat preservation (1-3)h heat treatment. With the increase of temperature and the extension of the holding time, the strength and residual stress of the cold drawn tube gradually decreased, and the impact toughness increased first and then decreased. When holding at 550 °C for 2 hours, the impact toughness reached the highest 34.6J;the mechanical properties of cold drawn tubes were mainly affected by the reduction of internal stress and grain deformation caused by heat treatment.
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