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API 5L, you must use professional equipment to complete the steps required to process includes the following steps: passivation step, cleaning step; coating step; curing step, the paint has dried before preheating step procedure, and bake interfere with heat treated coating temperature of the curing temperature of ± 20 ℃. The device is known in public facilities, based on the dipping trough with dry warm oven. Technology and equipment of the invention can not only large quantities of continuous production of galvanized pipe painted, and painted to ensure quality, surface can not afford to bubbles, can not afford to orange peel, efficiency can be increased two or three times, so that appearance look more beautiful! Gas Steel Pipe is bent round, square shape with a steel or steel plate and then welded into the other, the surface of the pipe joints. Welded steel pipe is used in blank or strip.Classification of welded steel pipe
According to weld shape, Oil Steel Pipe can be divided into straight welded pipe and spiral welded pipe. Among them, the straight welded pipe: the production process is simple, high efficiency, low cost, rapid development. Oil delivery: Longitudinal strength is generally higher than that, 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, with the same length of straight pipe seam, compared weld length of 30 to 100%, and lower production rate. Therefore, most of the use of smaller diameter straight seam welding pipe, large diameter spiral welded pipe are mostly used.By the application,Oil and gas pipeline welding can be divided into general-use pipe, galvanized pipe, oxygen pipe, wire pipe, metric pipe, roller pipe, deep well pump tube, automotive tube, transformer tube, welding thin-walled tube , welding shaped tube and spiral welded pipe.