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How is seamless steel tube produced?
Jun 20, 2018

How is seamless steel tube produced?

The raw material for rolling seamless tube is round tube blank. The round tube blank will grow to about 1 meter after cutting and processing by cutting machine, and will be sent to the furnace through conveyor belt for heating. The billets are heated in a furnace at a temperature of about 1,200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is the key problem. After the round pipe billet is out of the oven, it should go through the pressure piercing machine. Generally, the more common piercer is the tapered roller piercer, which has high production efficiency, good product quality, large perforation diameter and can wear many kinds of steel. After perforation, the round pipe blank is rolled by three rolls of inclined rolling, continuous rolling or extrusion. After extrusion, take off the tube and set the diameter. The pipe is formed by the tapered drill rotating into the steel embryo hole at high speed. The inner diameter of steel pipe is determined by the external diameter length of the drill bit of the sizing machine. After the steel pipe is fixed in diameter, it will enter the cooling tower and be cooled by water spraying. After cooling, the steel pipe will be straightened. After straightening, the steel pipe is sent to the metal inspection machine (or water pressure test) by the conveyor belt for internal inspection. If there are cracks, bubbles and other problems in the steel tube, they will be detected. Steel pipe quality inspection after the strict manual selection. After the steel pipe quality inspection, paint the serial number, specification, production batch number and so on. The crane is hoisted into the warehouse.


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