Heat treatment issues of carbon steel plates
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Which heat treatment for Q345 steel plates can reduce mechanical strength, and which one can increase it?
This material does not have a tendency to harden on its own, and ordinary heat treatment does not result in a significant increase in tensile strength. Post-weld heat treatment generally reduces some of the tensile strength, but improves plasticity and toughness.
Of course, cold working generally increases tensile strength, but it reduces plasticity and toughness.
Prolonged heating at the normalizing temperature causes grain growth, reducing mechanical properties.