Thick-walled large diameter seamless steel pipe industrial detail

There are more than 240 seamless steel pipe manufacturers in my country for thick-walled and large-diameter seamless steel pipes and more than 250 sets of large-diameter thick-walled seamless steel pipe units. Large-diameter thick-walled seamless steel pipes are mainly made of the outer surface of the steel pipe. In terms of diameter, generally, those with an outer diameter of more than 325 mm are called large-diameter steel pipes. As for thick walls, generally, those with a wall thickness of more than 20 mm are sufficient.

The following is the manufacturing process of steel pipes: The raw material for steel pipes is steel pipe blanks. The pipe blanks must be cut by a cutting machine into billets with a length of about 1 meter and sent to the furnace for heating via a conveyor belt. The billet is fed into the furnace and heated to a temperature of approximately 1200°C. The fuel is hydrogen or acetylene. Temperature control in the furnace is a key issue. After the round tube comes out of the furnace, it must be pierced through a pressure punching machine. Generally, the more common piercing machine is the tapered roller piercing machine. This type of piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can penetrate a variety of steel types. After perforation, the round tube blank is successively cross-rolled, continuously rolled, or extruded by three rollers. After extrusion, the pipe should be removed and calibrated. The sizing machine rotates a tapered drill bit at high speed into the steel blank to drill holes to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the drill bit of the sizing machine. After the steel pipe is sized, it enters the cooling tower and is cooled by spraying water. After the steel pipe is cooled, it will be straightened (in fact, many manufacturers no longer use straightening machines, but directly straighten the steel pipe after it passes through the rolling mill. It has reached the straightness of its steel pipe itself). After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by a conveyor belt for internal flaw detection. If there are cracks, bubbles, and other problems inside the steel pipe, they will be detected. After quality inspection, steel pipes must undergo strict manual selection (now all have laser detection inspections). After the quality inspection of the steel pipe, spray the serial number, specification, production batch number, etc. with paint. And it is hoisted into the warehouse by a crane.