Changsha Xiangjia Metal Materical Co., Ltd.

Internal anti-corrosion treatment of  SSAW steel pipe  1.       The anti-corrosion layer in the cement mortar can be constructed by mechanical spraying, manual plastering, dragging or centrifugal prefabrication. If it is necessary to use the prefabrication method as the inner anti-corrosion layer, protective measures should be taken for the anti-corrosion layer during transportation, installation and backfilling. 2.       During construction, firstly mix cement mortar, the ratio of cement to sand quality is 1: (1-2), the slump of cement mortar is 60-80mm, and the compressive strength of cement mortar should not be lower than 30MPa.   3.       The inner surface of the anti-corrosion layer of the cement mortar constructed by the mechanical spraying method is smooth, fine and uniform, and the effect is better. Changsha Xiangjia Metal Materical Co., Ltd.   the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing

  1.       The cleaning of  LSAW steel pipe  uses solvents and emulsions to clean the steel surface to remove oil, grease, dust, lubricants and similar organic substances, but it cannot remove rust, oxide skin, welding flux, etc. It is only used as an auxiliary means in production.   2.       The rust removal of LSAW steel pipe tools mainly uses tools such as wire brushes to polish the surface of the steel, which can remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level.   3.       Pickling of LSAW steel pipe: Generally, two methods of chemical and electrolytic pickling are used for pickling, and only chemical pickling is used for anti-corrosion of pipes, which can remove oxide scale, rust and old coating. reprocessing. Although chemical cleaning can make the surface achieve a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to caus

  1.       The raw materials of  LSAW steel pipe  are strip coil, welding wire and flux.   2.       The technology used in the production of LSAW steel pipe is divided into single wire or double wire submerged arc welding. 3.       Before the LSAW steel pipe is formed, the strip needs to be straightened, trimmed, planed, surface cleaned, conveyed and pre-bent.   4.       When using the weld gap control device, it must be ensured that the weld gap meets the welding requirements, and the pipe diameter, misalignment and weld gap must be handled in strict accordance with the regulations.   5.       All welds are inspected by online continuous ultrasonic automatic flaw detector to ensure 100% non-destructive testing of spiral welds and prevent defective products.   6.       After the LSAW steel pipe is completed, it is necessary to use an air plasma cutting machine to cut the steel pipe into individual pipes. After cutting into single steel pipes, each batch of steel pipes must be strictly

Elbow   are shorter than   bend . There are many types of elbows, such as seamless elbows and carbon steel elbows, which are two typical elbows. In addition, elbows and bend are different in some aspects. 1. Appearance. The elbow is relatively short compared to the bend. R=1 times to 2 times are elbows, and R>2 times are bend. The radius of curvature of the elbow is small, usually are 6D, while the bend is 40D. 2. Manufacturing process. The bend can be made of straight pipe with one-time molding, which not need to do anti-corrosion. The elbow should be customized, and it needs to do anti-corrosion, which makes it has long lead time. 3. Price. The elbow needs to be customized and need to do anti-corrosion, so that its price is higher than the bend. But it has high cost performance. The bend is easy to be damaged since it isn't do anti-corrosion treatment, but it is widely used in some projects that are not very demanding because of its low price.