Compared with seamless steel pipe, welded steel pipe has a lower cost and a higher production rate. The steel pipe production process is simple, high production rate, low cost, and rapid development. With the development of continuous rolling of fine strip steel and the progress of welding and inspection technology, the quality of the weld is constantly improving, and the varieties and specifications of welded steel pipe are increasing day by day, and in more and more fields instead of seamless steel pipe.

Types and manufacturing process of welded steel pipe:

(1) Spiral weld steel pipe for piles: steel pipe made of hot-rolled steel strip coil as pipe billet, often warm spiral forming, and made of double-sided submerged arc welding or high-frequency welding, is used for steel pipe for foundation piles of civil building structures, wharves, Bridges and so on.

(2) Spiral seam submerged arc welded steel pipe for general low-pressure fluid transportation: hot-rolled steel strip coil as tube billet, often warm spiral forming, using double-sided automatic submerged arc welding or single-sided welding method for water, gas, air and steam and other general low-pressure fluid transportation submerged arc welded steel pipe.

(3) Straight welded steel pipe: steel pipe whose weld is longitudinally parallel to the steel pipe. Usually divided into metric welded steel pipe, welded thin-wall pipe, transformer cooling tubing, and so on.

(4) Spiral seam submerged arc welded steel pipe for pressurized fluid transportation: hot-rolled steel strip coil as tube billet, often warm spiral forming, welding with double-sided submerged arc welding method, spiral seam steel pipe for pressurized fluid transportation.

(5) Ordinary carbon steel wire sleeve: steel pipe used to protect wires in industrial and civil buildings, installation machines and equipment, and other electrical installation projects.

(6) Spiral joint high-frequency welding steel pipe for general low-pressure fluid transportation: hot-rolled steel strip coil as tube billet, often temperature spiral forming, the high-frequency lap welding method is used for welding spiral joint high-frequency welding steel pipe for general low-pressure fluid transportation.

(7) Galvanized welded steel pipe for low-pressure fluid transmission: also known as galvanized electric welded steel pipe, commonly known as a white pipe. It is used for conveying water, gas, air oil, 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.

(8) Welded steel pipe for low-pressure fluid transportation: also known as general welded pipe, commonly known as black pipe. It is a welded steel pipe used for conveying water, gas, air, oil and heating steam, and other general low-pressure fluids and other purposes.

Cangzhou Shenlong Pipe mainly produces seamless steel pipe, straight seam steel pipe, and spiral steel pipe, but also can process galvanized, anti-corrosion coating, has more than 20 years of production history, reliable quality, is a qualified supplier of BP oil, Petro China.