Thin-walled cold drawn steel pipes are made of steel ingots or solid tube billets through perforation to make capillaries, and then hot rolled, cold rolled or cold drawn. Thin-walled cold drawn steel pipes play an important role in my country's steel pipe industry. The raw material of the thin-walled cold drawn steel pipe is a round tube blank. The round tube blank is cut by a cutting machine into a blank with a length of about 1 meter, and then sent to the furnace for heating via a conveyor belt. The billet is fed into the furnace and heated at a temperature of approximately 1200°C. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key issue. After the round tube is out of the furnace, it must be pierced through a pressure punching machine.
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