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Seamless steel pipes are made by heating solid ingot and pushing a piercing rod to form a hollow tube. Finishing of seamless steel could be done through techniques such as hot rolled, cold drawn, turned, roto-rolled etc. After going through the finishing process, all pipes are then pressure tested on a machine. The pipes are being stenciled after being weighed and measured. External coating can then be applied for use in the applications for aircraft, missiles, anti-friction bearing, ordnance, etc. The wall thickness for seamless steel pipes range from 1/8 to 26inch outside diameter. for more infomation,http://www.hnssd.com/news.asp?type=1&id=128

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