1. Welded steel pipe for low-pressure fluid transportation (GB/T3092-1993) also known as general welded pipe, commonly known as black pipe. Is used for conveying water, gas, air, oil and heating steam, such as the general lower pressure fluid and other uses of welded steel pipe. The wall thickness of steel pipe is divided into common steel pipe and thickened steel pipe. The nozzle end is divided into non-threaded steel pipe ( smooth pipe) and threaded steel pipe. The specification of steel pipe is expressed in nominal diameter (mm), and nominal diameter is approximate value of inner diameter. It is customary to say in inches, such as 11/2, etc. The welded steel pipe used for low pressure fluid transportation is widely used as the original pipe of galvanized welded steel pipe for low pressure fluid transportation, in addition to the steel pipe used for conveying fluid directly.

2. Galvanized welded steel pipe for low pressure fluid transportation (GB/T3091-1993) is also known as galvanized welded steel pipe, commonly known as white pipe. It is used to transport water, gas, air, oil and heating steam, warm water and other general low pressure fluid or other uses of hot dip galvanized welding (furnace welding or electric welding) steel pipe. The joint wall thickness of steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe, and the pipe end is divided into unthreaded galvanized steel pipe and threaded galvanized steel pipe. The specification of the steel pipe is expressed by the nominal caliber (mm), and the nominal caliber is the approximate value of the inner diameter. It is customary to use inches, such as 11 x 2, etc. 3. The spiral seam submerged arc welded steel pipe (SY5037-83) for low pressure fluid transportation is a kind of submerged arc welded steel pipe for water, gas, air and steam transportation, which is made of hot rolled steel strip coil as pipe billet and often formed by double-sided automatic submerged arc welding or single-sided welding.

4. The spiral seam high frequency welded steel pipe (SY5039-83) for general low pressure fluid transportation is made of hot rolled steel strip as pipe billet and formed at regular temperature. High frequency lap welding method is used to weld the spiral seam high frequency welded steel pipe for general low pressure fluid transportation. Jinjiang Da Changjiang Steel Pipe Industry Co., Ltd. specializes in the production and sales of large pipe, Fujian seamless pipe, Fujian spiral pipe and frame tube. Welcome to inquire: 0595-85521166.