Large diameter seamless steel pipe means outside diameter more than 100MM and the wall thickness is greater 0.2 than the outer diameter of the pipe, Large-diameter seamless steel tube is made from solid tube ingot or the perforation capillary, then through hot rolling and cold rolling or cold dial.

Cold drawn erw pipe, which is one of the best choices for the production of multi-stage hydraulic cylinders. Its process is the same as that of precision seamless pipe cold drawing. It is precision drawn by precision resistance welding (ERW) and manufactured with EN. 10305-2 EU mechanical cold drawn carbon steel welded pipe standard.

ASTM A106 seamless pipes are divided into two models: A106-A and A106-B. A106 seamless steel pipe for export is a steel pipe material commonly used at home and abroad, mainly used in construction, mechanical processing, electrical, petrochemical and other industries.

In building construction, copper is generally used in sheet and strip. Strip is 24 inches or less in width, while copper sheet is over 24 inches in width. Table 1.2A shows the standard dimensions of sheet and strip copper.

The materials of seamless pipe are: ordinary and high-quality carbon structural steel, low-alloy steel, alloy steel, stainless acid-resistant steel, etc.

Cast iron pipes are used for water supply, drainage and gas transmission lines, and it includes cast iron straight pipes and fittings. Low labor intensity. According to different casting methods, it is divided into continuous cast iron pipes and centrifugal cast iron pipes, among which centrifugal cast iron pipes are further divided into sand molds and metal molds.