WELDED STEEL PIPE STANDARDS

Welded steel pipe production process is simple, high production efficiency, variety specifications, less capital equipment, but the general strength less than seamless steel tubes. Since the 1930s. With the rapid development and progress of high-quality steel rolling production welding and inspection techniques. Weld quality continues to increase. Welded steel pipeincreasing varieties and specifications. And in more and more areas instead of seamless steel tubes. Welded steel pipes in the form of weld into Longitudinal and spiral welded pipe.

Longitudinal production process is simple, high production efficiency, low cost, rapid development. Spiral Welded Longitudinal generally higher than that. You can narrow the billet production of large diameter pipe. You can also use the same width of the billet production of different pipe diameters. However, compared with the same length of straight seam pipe. Weld length of 30 to 100%. And lower production rate. Therefore, smaller diameter pipe is mostly a straight seam welding. Large diameter spiral welded pipe for the most part.

Low pressure liquid delivery welded steel pipe (GB / T3092-1993), also known as general welded pipe, commonly known as the clarinet. Welded steel pipe is used for transporting water, gas, air, oil and heating steam and other general low pressure fluid and other uses. Then divided into ordinary steel pipe wall thickness and thicker steel. It took over end into the form of steel pipes without (fluorescent tubes) and with steel pipe. Pipe specifications with nominal diameter (mm) Fig. The nominal diameter is the diameter of the approximation. Traditionally commonly expressed in inches, such as 11/2 and so on. Low pressure fluid in addition to direct for conveying fluids outside the welded steel pipe. Also widely used as a low pressure fluid delivery galvanized welded steel pipe of the original tube.

1. Low pressure fluid delivery galvanized welded steel pipe (GB / T3091-1993), also known as galvanized welded steel pipe, commonly known as white tube. Is used for conveying water, gas, air and steam heating oil, warm water, etc. are generally lower pressure fluid or other uses hot-dip galvanized welded (furnace brazed or welded) steel pipe. Pipe wall thickness then divided into ordinary galvanized steel and thicker galvanized steel; take over the side into the form of threaded galvanized steel and non-threaded galvanized steel band. Pipe specifications with nominal diameter (mm), said nominal diameter is the diameter of the approximation. Traditionally commonly expressed in inches, such as 11/2 and so on.

2. Ordinary carbon steel wire casing (GB3640-88) industrial and civil construction, installation of machinery and equipment for the protection of electrical installation engineering steel wires.

3. Straight seam welded steel pipe (YB242-63) is parallel to the longitudinal weld steel pipe steel pipe. Usually divided into metric welded steel pipe, welded thin-walled tube, transformer cooling tubing and the like.

4. Pressure fluid transport with spiral submerged arc welded pipe (SY5036-83) is a hot-rolled steel strip coils for the tube. Often warm spiral shape, using double-sided submerged arc welding method for spiral seam steel pressurized fluid delivery. Strong pressure steel, good welding performance, through a variety of rigorous scientific examination and testing, the use of safe and reliable. Large diameter steel pipes, transmission efficiency, and can save the laying of pipeline investments. Mainly used to transport oil, natural gas pipelines.

5. Pressure fluid transport with spiral seam high frequency welded steel pipe (SY5038-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using high-frequency welding lap welding method. Spiral seam high frequency welded steel pipe for pressure fluid delivery. Strong pressure steel, plastic, and easy welding and machining molding. And through a variety of rigorous scientific examination and testing, the use of safe, reliable, large-diameter steel pipes, transmission efficiency, and can save the laying of pipeline investments. Mainly used for laying transport oil, natural gas pipeline.

6. General low pressure liquid delivery spiral seam high frequency welded steel pipe (SY5039-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape. Using high frequency lap welding method for general low pressure liquid delivery spiral seam high frequency welded steel pipe.

7. Pile with spiral welded steel pipe (SY5040-83) is a hot-rolled steel strip coils for the tube. Often warm spiral shape. Using double-sided submerged arc welding or high frequency welding steel. For civil engineering structures, docks, bridges and other infrastructure pile with steel pipe.