Welded steel sheet or strip is bent after molding, then made by welding. Press the seam into the form of the Longitudinal and spiral welded pipe. By end-use is divided into general pipe, galvanized pipe, Oxygen pipe, wire casing, metric pipe, roller tube, deep well pump tube, automotive, transformer tubes, welded thin-walled tubes, welded shaped tubes and spiral welded pipe. General Pipe: General pipe used to transport low-pressure fluid. With Q195A, Q215A, Q235A steel. Easy welding can also be used with other soft steel. Pipe to be pressure, bending, flattening and other experiments, there are certain requirements on the surface quality, delivery usually length 4-10m, often requires length (or double length) delivery. Pipe with a nominal diameter specifications indicate (mm or inch) nominal diameter different from the actual, pipe wall thickness have the required two ordinary steel and thicker steel, steel pipe end in the form of press is divided threaded and non-threaded two.
Following is a brief introduction to the application of several pipe
1, the general pipe for water, gas, air, oil and heating steam and other general low pressure fluid delivery.
2, ordinary carbon steel wire casing (GB3640-88) industrial and civil construction, equipment installation and other electrical installation work for the protection of steel wires.
3, straight seam welded pipe (YB242-63) is parallel to the longitudinal welds and steel pipe. Usually divided into metric welded pipe, welded thin-walled tube, transformer cooling tubing and the like.
4, pressurized fluid transport with spiral submerged arc welded pipe (SY5036-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, with double-sided submerged arc welding method for pressurized fluid transport spiral pipe joints. Strong pressure steel, 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 (SY5038-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using high frequency lap welding method for delivery of pressurized fluid spiral seam high frequency welded steel pipe. 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, can save the laying of pipeline investments. Mainly used for laying transport oil and natural gas pipelines.
6, general low pressure liquid delivery spiral submerged arc welded pipe (SY5037-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using double-sided automatic submerged arc welding or welding into the legal system for water, gas, air and steam low pressure liquid delivery SAW pipe.
Pipe can be used cloth, Luo, Victoria three kinds of hardness test, measurement HB, HRB (or HRC) and HV hardness three hardness measuring only one can be. The latest development of portable surface Rockwell hardness, Rockwell hardness pipe, can be fast, accurate hardness testing, so in the past in the country solved the problem difficult to solve.