The Classification of the Black Steel Pipe

The time of issue:2014-3-18 10:05:36       Author:

Corrosion resistance points, black steel pipe refers to the steel belt or steel plate bending deformation shapes such as round, square before welding, jointed on the surface of steel pipe. Depending on different welding methods which can be divided into electric arc welding tube, high frequency or low frequency electric resistance black steel pipe and gas welding tube, furnace welding pipe, bondi pipe and so on. Focus on the shape of the steel pipe can be divided into straight seam welded pipe and spiral welded pipe. Welded steel pipe used in oil drilling and machinery, manufacturing and so on.

It is to use steel plate or steel strip after bending forming, and then through welding. According to the application, this kind of steel pipe is divided into galvanized welded pipe, oxygen blowing metric welded pipe, wire casing, roller tube, auto tube, transformer, electric welding thin wall pipe, welded pipe and spiral welded pipe and so on. General welding work for low pressure liquid can be used to other mild steel welding manufacturing. Steel pipe for pressure, bending, flattening and so on experiment, the surface quality is a certain request, usually the delivery length for 4 to 10 m, often required scale delivery of the goods. Of the specifications of the black steel pipe in nominal diameter nominal diameter is different from the actual. According to the regular thick wall of the steel pipe and the ordinary steel pipe with thick steel pipe, the steel pipe and the forms of the tube don't need two pipe end points.

The pipe doesn't need for welding machine and wire resistance high frequency black steel pipe set, also doesn't need to do across the ground, to brush paint, eliminating the traditional fusion welding and so on. Simply connected with the steel pipe and tube, black steel pipe joints positioning after tight screwing with specialized tools. And high frequency resistance seam welding junction box with a lock the mother can be set. Pipeline bends with pipe bender can bend the corresponding curve.

Black steel pipe should be tested for mechanical properties test and flattening test, flaring test, and to achieve the requirements of the standard. Steel pipe should bear the internal pressure, if it is necessary, it can be tested by the pressure with 2.5 Mpa to make it no leakage in a minute. The detection method of eddy current flaw is used to probe on the rack to test it with the distance of 3-5mm. The black steel pipe to weld with a full scan in a rapid movement, and the flaw detection signal can automatic processing and automatic sorting to achieve the purpose of inspection. After inspection of welding work flying saw length cut off by the regulation, the turn off. It should be flat on both ends of the steel pipe that chamfered, printed mark, and product packaging work hexagonal strapping after leaving the factory.

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