Welded pipe standard

Welded steel pipe, plates or strips for is after curly made of welded steel pipe after molding. Welded steel pipe production process is simple, high production efficiency, different specifications, equipment financing small, but the General strength of less than seamless steel tubes. Since in the 1930 of the 20th century, with high quality steel rolling production in rapid development and progress of welding and inspection technology, continuously improve weld quality, welded steel pipe specifications growing varieties, and in a growing number of areas instead of seamless steel tubes. Weld seam of welded steel pipe in the form of longitudinal welded pipe and spiral welded pipe.

Longitudinal welded pipe production process is simple, high efficiency, low cost, rapid development. High strength of spiral welded pipe than longitudinal welded pipe, can narrow the billet production of large diameter welded pipes, you can use the same width of the billet production of different diameter of the pipe. But compared with the straight seam pipe of the same length, weld length 30~100%, and lower production rate.

Therefore, most small-diameter pipe used straight seam welding, large-diameter pipe is mostly used spiral welding.

1. low-voltage transmission fluid used welding pipe (GB/T3092-1993) also known as a pipe, commonly known as the clarinet. Is used to carry air, water, gas, heating oil and steam generally low fluid pressure and other uses, such as welded steel tubes. Steel pipe wall thickness into ordinary and heavy steel pipe took over form is divided into a threaded pipe (optical tube) and a threaded pipe. Specifications of steel pipe with a nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Traditionally expressed in inches, such as 11/2. Low-voltage transmission fluid used welding pipe directly to the transmission fluid, but also as the original galvanized welded steel pipe for low-voltage transmission fluid pipes.

2. low-voltage transmission fluid used welding galvanized steel pipe (GB/T3091-1993) also known as galvanized steel pipe welding, commonly known as the white tube. Oil is used for transportation of water, gas, air and steam heating, warm water, generally low fluid pressure or other use of hot-dip galvanized welding (furnace soldering or electric welding) pipe. Pipe wall thickness into ordinary galvanized pipe and thick galvanized steel pipe took over form is divided into three threaded galvanized pipe threaded galvanized pipe. Specifications of steel pipe with a nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Traditionally expressed in inches, such as 11/2.

3. ordinary carbon steel wire casing (GB3640-88) is the industrial and civil construction, installation of machinery and equipment and other electrical installation works for the protection of wire and steel.

4. straight seam welded steel pipes (YB242-63) is welded with steel tube parallel to the longitudinal steel pipe. Usually divided into metric welded steel tubes, welded thin-walled tubes, transformer cooling tubing and so forth.

5. the pressure fluid spiral submerged arc welded steel pipe (SY5036-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, with both sides submerged arc welding method, for pressure transmission fluid spiral seam pipe. Pipe pressure-bearing ability, good welding properties, through a variety of rigorous scientific examination and testing, safety and reliability. Pipe diameter, high transmission efficiency, and may save the laying of pipeline investments. Mainly used for transportation of oil and natural gas pipelines.

6. pressure fluid spiral high frequency welded steel pipe (SY5038-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, lap welding using high frequency welded, for pressure spiral high frequency welded tubes for fluid transport. Pipe pressure-bearing ability, good ductility for welding and processing; through a variety of strict and scientific inspection and testing, use of safe, reliable, pipe diameter, high transmission efficiency, and save the laying of pipeline investments. Mainly used in the transportation of oil, natural gas and pipeline laying.

7. the General spiral submerged arc welded steel pipe for low-voltage transmission fluid (SY5037-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, or one-side welding of duplex automatic submerged arc welding method used for water, gas, air and steam are generally submerged arc welded steel pipe for low-voltage transmission fluid.

8. spiral high frequency welded steel pipe for low-voltage transmission fluid (SY5039-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, lap welding using high frequency welding method for spiral high frequency welded steel pipe for low-voltage transmission fluid.

9. for spiral welded steel pipe piles (SY5040-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, made of double submerged arc welding or high-frequency welding, used in civil engineering structures, wharf, bridge base pile with steel pipe.