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1.welded pipefor delivering low-voltage fluid (GB/T3092-1993). This kind of pipe also known as general welded pipe, or black pipe, which is mainly used for delivering low-voltage fluid, including water, oil and gas etc. The specifications of pipe are presented by nominal diameter, which is the approximation of inner diameter. Traditionally, the diameter is expressed by inches, such as 11/2 etc. Besides directly delivery fluid, the pipe is widely applied as raw pipe of galvanized welded steel pipe for fluid.

2. General carbon steel wire casing (GB3640-88). This kind of welded pipe is commonly applied in industrial and civil construction, and installation of electrical equipment, plays a role of a protector for electrical wires.

3.Straight seam welded steel pipe (YB242-63). This kind of pipe can be divided in to metric welded pipe, welded thin-walled tube and transformer cooling tube, etc.