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　　Welded steel pipes for low-pressure fluid transportation are also called general welded steel pipes, commonly known as black pipes. It is a welded steel pipe used for conveying water, gas, air, oil, heating steam and other general low pressure fluids and other purposes. The wall thickness of welded steel pipe can be divided into ordinary 22 Inch ERW Spiral Carbon Welded Steel Pipe and thick steel pipe, and the nozzle end can be divided into welded steel pipe and spiral steel pipe. The specification of steel pipe is expressed by nominal diameter, which is the approximate value of inner diameter. It is customarily expressed in inches, such as 11/2, etc. In addition to directly conveying fluids, welded steel pipes for low-pressure fluid conveying are also widely used as raw pipes for welded steel pipes for low-pressure fluid conveying.

　　Welded steel pipes for low pressure fluid transportation are also called welded steel pipes, commonly known as white pipes. It is a hot dip galvanized welded steel pipe used for conveying water, gas, air, oil, heating steam, warm water and other generally low pressure fluids or other purposes. The wall thickness of steel pipe can be divided into common welded steel pipe and thick welded steel pipe, and the end of pipe can be divided into non-threaded galvanized steel pipe and threaded galvanized steel pipe. The specification of steel pipe is expressed by nominal caliber, which is approximate to the inner diameter, and is customarily expressed in inches.

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