Heat treatment of metal materials is divided into overall heat treatment, surface heat treatment and chemical heat treatment. The heat treatment of seamless steel tubes generally adopts the overall heat treatment.
Carbon steel seamless tubes need to undergo basic processes such as heating, heat preservation and cooling during heat treatment. In these processes, defects may occur in steel pipes. The heat treatment defects of seamless steel pipes mainly include unqualified structural properties of steel tubes, unqualified dimensions, surface cracks, scratches, severe oxidation, decarburization, overheating or overburning, etc.
The main three processes of heat treatment of seamless steel tube:
The second process of heat treatment of carbon steel seamless tube is heat preservation. Its purpose is to uniform the heating temperature of the steel pipe to obtain a reasonable heating structure.
The third process of heat treatment of carbon steel seamless tube is cooling. The cooling process is the key process of steel pipe heat treatment, which determines the metallographic structure and mechanical properties of the steel tube after cooling. In actual production, there are various cooling methods for steel tubes. Commonly used cooling methods include furnace cooling, air cooling, oil cooling, polymer cooling, water cooling, etc.
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