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Oil and gas transmission pipes - mainly longitudinally welded pipes, spiral seam welded (HSAW) longitudinally welded pipes including UOE welded pipe and JCOE of welded pipe.

The first mode of production: the tube (plate, belt) molded directly welded into the pipe, the main steps of the strip forming, welding, sizing. Features: less production processes, engineering process is simple, short production cycle, product accuracy is slightly lower.

Surface hardening, heat treatment commonly used induction heating or flame heating manner. The main technical parameters of surface hardness, hardness and effective local hardened layer depth. Hardness testing Vickers hardness tester can also be used or Rockwell Superficial Rockwell hardness. Test Force (ruler) of choice and effective case depth and hardness of the surface. This involves three kinds of hardness.

Process principles for steel pipe factory electroplating wastewater treatment: electroplating wastewater from the electroplating process plating, the bath filtration, waste bath emissions.

Steel tube cutting machine includes laser cutting machine, square tube laser cutting machine, oval tube laser cutting machine. The pipe cutting machine processing has a wide range to meet the user pipe cutting and processing, square pipe, oval shape pipe.

Welded steel pipe (ERW steel pipe, LSAW steel pipe, SSAW steel pipe )is made of teel plate or strip after the basic curl after molding .Welded steel pipe manufacturing process is simple, efficient, and more varieties of different specifications, equipment, less capital, but the general strength of less than seamless.

Anti-corrosion steel in people's daily life and plays an important role in different, anti-corrosion steel pipe generally refers to using a special process for ordinary steel pipe anti-corrosion treatment, the steel pipe has some corrosion resistance in general, or for the waterproof, rust-proof, anti-acid, oxidation and other characteristics, the general said PE anti-corrosion steel refers to polyethylene pipe corrosion, is the use of advanced science and technology from the processing of the article, PE anti-corrosion steel is widely used in petroleum, natural gas, city gas, city water, coal slurry transportation pipeline and so on.

Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).

Modern straight seam submerged arc welding steel pipe (UOE, JCOE) in the manufacturing process have set up continuous welding process. Its role is carried out after forming the tube shape, forming the inner weld seam position and back in order to ensure that the steel pipe size and shape for pipe welding, welded pipe quality and production efficiency is increased.

Steel pipe burst test rig is used in certain specifications of the polymer sheet material (such as the surface of the film, leather, etc.), or a pipe, the inner surface of the container, through the liquid or air to continuously applied pressure to test sample burst when the maximum pressure and get material bursting strength equipment.

For hydrostatic testing purposes, there are two: one is the process of hydraulic test to test whether the leaking pipe, that test tube sealing performance; Another is confirmatory hydrostatic test to test the strength of steel adequacy.

Rendering using TIG backing, backing thickness not less than 3mm; often used when backing weld small flashlight to check whether or not the root of the weld penetration phenomenon; welding to "Positioning block" when the "positioning block "get rid of, and with a grinder pads worn away, leaving no scars and other traces of welding, and after the naked eye or with a low-power magnifier check to make sure no cracks and other defects, can continue welding; to improve the protective effect of argon fight tear a little bit at the end when welding aluminum foil tape