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　　Carbon steel pipe can be divided into seamless steel pipe, straight seam steel pipe, spiral steel pipe, high frequency welding steel pipe, etc. The raw material for rolling seamless carbon steel pipe is round tube blank. The round tube blank is cut by cutting machine, and the billet with a growth of about 1 m is sent to the furnace by conveyor belt for heating. The billet is heated in a furnace at about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key problem. After the round tube is discharged from the furnace, it needs to pass through the pressure piercer.

　　Generally, the more common piercer is the cone roll piercer. This kind of piercer has high production efficiency, good product quality, large perforation diameter expansion, and can wear a variety of steel grades. After piercing, the round billet is successively rolled by three roll cross rolling, continuous rolling or extrusion. After extrusion, the tube should be removed for sizing. The sizing machine rotates the cone drill bit into the steel blank at high speed to form a carbon steel pipe. The inner diameter of the carbon steel pipe is determined by the outer diameter length of the drill bit of the sizing machine. After sizing, the carbon steel pipe enters the cooling tower and is cooled by water spray. After cooling, the steel pipe will be straightened. After straightening, the carbon steel pipe is sent to the metal flaw detector by conveyor belt for internal flaw detection. If there are cracks and bubbles inside the steel pipe, it will be detected. After the quality inspection of carbon steel pipes, strict manual selection is required. After the quality inspection of the carbon steel pipe, the number, specification and production batch number shall be sprayed with paint. It is hoisted into the warehouse by crane.

　　Carbon steel seamless steel pipe is divided into hot rolling seamless steel pipe and cold drawing seamless steel pipe because of its different manufacturing process. Cold drawn tube is divided into round tube and special-shaped tube.

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