Changsha Xiangjia Metal Materical Co., Ltd.

The blanks used for   welded steel pipes   are steel plates or strip steels. According to different welding processes, they are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes. According to different welding forms, they are divided into straight seam welded pipes and spiral welded pipes. According to different end shapes, they are divided into round welded pipes and special-shaped (square, flat, etc.) welded pipes. Due to different materials and uses, welded pipes are divided into the following several varieties: GB/T3091-2008 (Welded steel pipes for low pressure fluid transportation): It is mainly used for transporting water, gas, air, oil and heating hot water or steam and other general low-pressure fluids and pipes for other uses. The representative material is: Q235A grade steel. GB/T14291-2006 (Welded steel pipe for mine fluid transportation): It is mainly used for straight seam welded pipes for mine compressed a...

1.       The raw materials are strip coil, welding wire and flux. They must pass strict physical and chemical inspections before they are put into operation.   2.       The head and tail of the strip are butted, using single-wire or double-wire submerged arc welding, and active submerged arc welding is used for repair welding after rolling into a steel pipe.   3.       Before forming, the strip is processed by leveling, trimming, planing, surface finishing, transportation and pre-bending.   4.       The electric contact pressure gauge is used to control the pressure of the cylinder on both sides of the conveyor to ensure the smooth transportation of the strip.   5.       Use external control or internal control roll forming.   6.       The welding seam gap control device is selected to ensure that the welding seam ...

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...

With the rapid development of   SSAW steel pipe , some fake and inferior SSAW steel pipe products also appeared in the market one after another, so how to correctly and accurately identify the quality of SSAW steel pipe? 1.       The appearance of fake and inferior SSAW steel pipe often has a pockmarked surface.   2.       The cross section of the fake SSAW steel pipe is oval.   3.       The composition of a good SSAW steel pipe is uniform.   4.       The inner diameter of the fake and inferior SSAW steel pipe fluctuates greatly.   5.       Fake SSAW steel pipe is easy to be scratched.   6.       The surface of fake and inferior SSAW steel pipe is prone to scarring.   7.        The trademark and printing of a good SSAW steel pipe are relatively standardized.   8.  ...

  1.       The easiest way is to observe the surface quality of the  SSAW steel pipe . The surface quality of the inferior SSAW steel pipe is relatively poor, and there are problems such as pitting, knots, and unevenness. 2.       Secondly, we should also pay attention to observe whether there are scratches and cracks on the surface of the SSAW steel pipe. If the above phenomenon occurs, it means that the SSAW steel pipe is of inferior quality.   3.       When observing, we also need to pay attention to the color of SSAW steel pipe. For SSAW steel pipe that is light red or similar to pig iron color, it cannot be selected. A good SSAW steel pipe needs to have a metallic luster.   4.       The cross-section of high-quality SSAW steel pipe is relatively neat, while the inferior SSAW steel pipe has the phenomenon of meat falling off due to the material, so it is uneven. ...

SSAW steel pipe has the characteristics of pollution-free and low noise in terms of production efficiency and economic benefits, and does not produce waste water or waste gas. Circulating water cooling is used in production, which is energy-saving and environmentally friendly, and saves labor.   In terms of application, with the improvement of SSAW steel pipe quality and non-destructive testing reliability, SSAW steel pipe has become more and more widely used.   The welding process of SSAW steel pipe has advantages in many aspects, and it has a wide adaptability to the material of the tube blank and the size of the steel tube.   SSAW steel pipe not only improves the welding speed, but also obtains a weld with a small heat-affected zone and good penetration.   In terms of quality, the weld quality of SSAW steel pipe is good, the internal and external burrs are small, the welding speed is high, and the power consumption is small.   Changsha Xiangjia Metal Materica...

The material of   SSAW steel pipe   is Q235 A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20#, Q345, L245, L290, 40#, 60#, X42, X46, X70 , X80. Different usages of SSAW steel pipe, the raw materials is different. For example: the material required for SSAW steel pipe used for piling is Q235B SSAW steel pipe used for water pipeline, the material should be Q235B SSAW steel pipe that used in oil and gas industry, the material is Q235B and Q345B.

  1.         Small and medium-sized steel bars, wire rods, steel bars, medium-diameter steel pipes, steel wires and wire ropes, etc., can be stored in a well-ventilated material shed, but must be placed on top and under the pad.  　　 2.         Some small steels, thin steel plates, steel strips, silicon steel sheets, small-diameter or thin-walled steel pipes, various cold-rolled and cold-drawn steels, and high-priced, corrosive metal products can be stored in the warehouse.  　　 3.         The site or warehouse for storing spiral steel pipe products should be located in a clean and well-drained place, away from factories and mines that produce harmful gases or dust. Weeds and all debris should be removed on the field, and the steel should be kept clean.  　　 4.         Large section steel, rails, steel plates, large diameter steel p...

 Insulation steel pipe is a steel pipe that has been processed by heat preservation technology and under the action of different working environments and external media to ensure that the internal temperature and surface temperature of the working steel pipe meet or meet the requirements of use. Composition of insulation steel pipe : 1. Outer-protected steel pipe: protect the insulation layer from groundwater erosion, support the pipe working and withstand an external load, to work in the right way. 2. Anti-corrosion layer: protect the outer steel pipe from corrosive substances and extend the service life of the steel pipe. 3. Drag-reducing layer: to ensure the free movement of the working steel pipe during thermal expansion and contraction. 4. Polyurethane foam layer: to ensure the temperature of the medium, and to ensure that the surface of the outer protective tube maintains normal temperature. 5. Barrier and reflective layer: to ensure that the organic foam material does not en...

Straight seam steel pipe  is a welded steel pipe with one longitudinal weld line on the pipe body. GB / 9711.1 specifies that the straight seam steel pipe can have two straight welds when the diameter is over 914.4, and the angle of the weld is 180 degrees. Weld quality requires the same technical parameters as straight seam steel pipe. According to the production process, it is divided into: ERW high-frequency straight seam steel pipe, JCOE straight seam steel pipe, rolled straight seam steel pipe. Straight seam steel pipe is a general term for high-frequency straight seam, submerged arc straight seam, electric welding straight seam, pipeline straight seam and other production process products. The high-frequency straight seam steel pipe use the skin effect of high-frequency current to cause high temperature at both ends of the steel plate in a short time and squeeze and fused together by external force. It is a true buttless base metal butt joint. ERW high-frequency stra...