Basic Concepts And Processing Procedures Of Seamless Steel Pipes
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1. Basic concepts of seamless steel pipes
Seamless steel pipes are made from steel ingots or solid tube blanks that are perforated into capillary tubes, and then hot-rolled, cold-rolled, or cold-drawn.
2. Processing process of seamless steel pipe
The raw material for rolling national standard steel pipes is round tube billet. The round tube billet must be cut by a cutting machine into a billet 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 1,200 degrees Celsius. 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 by 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 outer diameter length of the sizing machine's drill bit determines the steel pipe's inner diameter. After the national standard 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. After straightening, a conveyor belt sends the steel pipe to the metal flaw detector (or hydraulic test) 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. 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.
