Changsha Xiangjia Metal Materical Co., Ltd.

The strength of   SSAW pipe   is higher than LSAW pipe, which can produce welded pipes with larger diameters from narrower billets, also it can use billets of the same width to produce welded pipes with different diameters. However, compared with the same length of LSAW pipe, the seam length of the SSAW pipe is increased by 30~100%, so the produce speed is low. Therefore, most of the welded pipes with smaller diameters use straight seam welding, and most of the welded pipes with large diameters use spiral welding. SSAW pipe is divided into two types: automatic submerged arc welded steel pipe and high frequency welded steel pipe. 1. Spiral seam automatic submerged arc welded steel pipes are divided into two categories: A-type pipes and B-type pipes according to the pressure of the conveying medium. Type A pipes are welded with ordinary carbon steel Q235, Q235F and ordinary low-alloy structural steel 16Mn. Type B pipes are welded with steel Q235, Q235F, Q195, etc., and are used ...

  1.       From the perspective of being suitable for offshore oil and gas transportation, it is bound to focus on the construction of LSAW. With the development of oil exploration to the depths of the ocean, due to the impact of pressure, impact and bending forces on the pipeline laying on the seabed, flattening occurs. In order to improve the pipeline transportation capacity and ensure, the submarine pipelines are developing in the direction of thick walls, so the submarine pipelines mostly use LSAW. 2.       Coal slurry and slurry pipelines need to use LSAW. The pipeline transportation of coal and mineral powder in a "paste" state is the effective upward direction. 3.       LSAW are required for machinery, construction, and chemical engineering. The valve seat of the machinery industry manufactures the valve seat. At present, the inner hole is processed by the forging part, which is time-consuming and cos...

  LSAW steel pipes  are divided into large-diameter LSAW steel pipes and small-diameter LSAW steel pipes according to the range of diameters. Small-diameter LSAW steel pipes are also be called welded pipes. 1. The caliber range of large-diameter LSAW steel pipes The specifications of large-diameter LSAW steel pipes are above 219mm, and the wall thickness is above 5mm. At present, the maximum diameter of double welds can reach 2020mm, and the maximum diameter of single welds can reach 1220mm. 2. The caliber range of small-diameter LSAW steel pipes The minimum diameter of the welded pipe can reach four points, and the diameter is about 20mm. 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 all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annua...

  1. Cleaning Grease, dust, lubricants, and organic matter adhering to the surface of the  LSAW steel pipe , usually we use solvents and emulsions to clean the surface. However, the rust, oxide scale, and welding slag on the surface of the steel pipe cannot be removed, so that it needs tools. 2. Tools to remove rust Steel pipe surface oxide scale, rust, welding slag, wire brush can be used to clean and polish the surface treatment. There are two types of tool rust removal: manual and power. Hand tools can reach Sa2 level, and power tools can reach Sa3 level. 3. Pickling Common pickling includes chemical and electrolytic methods. However, only chemical pickling is used for anticorrosion of pipelines. Chemical pickling can able to get a certain degree of cleanliness and roughness on the surface of the steel pipe, which is convenient for subsequent anchor lines. Usually used as a reprocessing after shot blasting (sand). 4. Shot blasting to remove rust The high-power motor drives ...

  When storing   LSAW steel pipes , some methods are used to increase the stability of the steel pipes, so what should be done? Here, we'll talk about it in detail. 1. When storing LSAW steel pipes, pay attention to ensuring the upper and lower pads. The second is to ensure a ventilation space to avoid reactions during storage; some metal products that should be more careful in storage; 2. It is necessary to choose a suitable environment, like a warehouse. If not, the drainage should be unblocked, and the environment should be clean, and there should be no harmful gases or other dust in the air to avoid affecting the straight seam steel pipe; 3. Different types and specifications of straight seam steel pipes should be stored separately to avoid confusion. 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 all kinds of steel pipe in various grade...

The maximum wall thickness of the  LSAW steel pipe  can be 50mm, the press of the pressure is limited, and if you need a steel pipe which wall thickness exceeds 50mm, seamless steel pipe can be the only choice. The minimum wall thickness of LSAW steel pipes can be produced to 8mm. The first step is to press the plate into a round shape when produce LSAW steel pipes. Therefore, there are requirement on the wall thickness of the steel plate. If the steel plate is too thin, the press cannot crush the steel plate or it can cause deformation, or pressed into an ellipse. So that minimum wall thickness LSAW steel pipe can be produced is 8mm. The wall thickness is less than 8mm using coiled pipes. The coiled pipes are made by T-welding, which are all section by section. The stitching is different from the straight stitch. Changsha Xiangjia Metal Materical Co., Ltd.  is the leading manufacture in China, has been insisting on product quality as the center and inheriting qu...

  1.       From the perspective of being suitable for offshore oil and gas transportation, it is bound to focus on the construction of LSAW. With the development of oil exploration to the depths of the ocean, due to the impact of pressure, impact and bending forces on the pipeline laying on the seabed, flattening occurs. In order to improve the pipeline transportation capacity and ensure, the submarine pipelines are developing in the direction of thick walls, so the submarine pipelines mostly use LSAW. 2.       Coal slurry and slurry pipelines need to use LSAW. The pipeline transportation of coal and mineral powder in a "paste" state is the effective upward direction. 3.       LSAW are required for machinery, construction, and chemical engineering. The valve seat of the machinery industry manufactures the valve seat. At present, the inner hole is processed by the forging part, which is time-consuming and cos...

    The base material of  LSAW  is a single controlled-rolled steel sheet isotropic, which can be 100% non-destructive testing. The stress state of LSAW is good after forming. Due to the mechanical expansion, the internal stress can be eliminated and the geometric accuracy of the steel pipe can be improved. The internal quality of LSAW is good. Because welding is performed on a flat surface, welding conditions, automatic tracking, and non-destructive testing are easy to carry out, which results in low weld height and high accuracy of internal and external welds.   LSAW has a wide range of wall thickness, generally 6-25 mm, and the thickness can reach 45 mm.   LSAW has good bending and flattening resistance. LSAW welds are 60% shorter than spiral welded pipes, and the probability of weld defects is low.    Longitudinal seam welded pipe (LSAW) has high reliability.   Changsha Xiangjia Metal Materical Co., Ltd. the Steel Pipe Division of ADTO GR...

  LSAW steel pipes  shall be subjected to hydraulic test one by one, and the test pressure shall be calculated according to the formula, the maximum pressure shall not exceed 10MPa, and shall be stabilized. The time should be more than 5s, and there should be no leakage on the pipe wall. P=2RS/D(2) In the formula:  P——test pressure, MPa; R——stress, 50% of the yield point, MPa; S——Nominal wall thickness of steel pipe, mm; D——Nominal outer diameter of steel pipe, mm; The supplier can replace the hydraulic test with eddy current flaw detection, and the qualification level should meet the A level in the GB/T 7735-1995 standard. Changsha Xiangjia Metal Materical Co., Ltd.  has been engaged in the  steel pipe industry over 20 years and has now become a leader in the industry. If you have any inquiry, welcome to contact us!

  LSAW steel pipe  is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. Generally divided into metric electric welded steel pipes, electric welded thin-walled pipes, transformer cooling oil pipes, etc. Welded pipes with larger pipe diameters can be produced with narrower billets, and welded pipes with different pipe diameters can be produced under the same billet width, but are comparable Compared with long straight seam pipes, the weld length is increased by 30% and 100% respectively, and the production speed is lower. Next, I want to introduce how to measure the length of a straight seam steel pipe. According to the different processes of the manufacturer, the length of LSAW steel pipe measurement system has a various of measurement methods, are following types: 1. The basic principle of measuring the length of the grating ruler is: two fixed-length grating rulers are set on the outer side of the LSAW steel pipe, the grating rulers at ...

Domestic materials are Q235A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20 #, Q345, L245, L290, X42, X46, X70, X80 The billet used in the  LSAW steel pipe  is steel plate or strip steel. LSAW steel pipe divided into the following varieties due to different materials and uses: GB / T3091-2008 (Welded steel pipe for low-pressure fluid transportation). Mainly used for conveying water, gas, air, oil, heating hot water or steam and other low-pressure fluids and other use pipes. GB / T14291-2006 (Welding steel pipes for mine fluid transportation). Mainly used for LSAW steel pipes for mine pressure, drainage, shaft gas discharge. GB / T12770-2002 (stainless steel welded steel pipe for mechanical structure). Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. GB / T12771-1991 (stainless steel welded steel pipe for fluid transportation). Mainly used to transpo...

We know that the quality of the welded seam determines the quality of the  LSAW steel pipe . Once the porosity of the LSAW steel pipe, it will not only affect the tightness of the welded pipe, cause leaks in the pipe, but also become an induced point of corrosion. Reduce weld strength and toughness.  In general, moisture, dirt, scale and iron filings in the flux, welding composition and thickness, surface quality of the steel plate, treatment of the steel plate side plate, welding process and steel pipe forming process, etc. may be the cause of the porosity of the weld. Therefore, during welding, if the welding temperature is high, the weld seam will be over-burned to form a perforation. When it contains the appropriate amount of CaF2 and SiO2, it will react and absorb a large amount of H2, generating HF with high stability and insolubility in liquid metal. Prevent the formation of hydrogen holes; the forming factor of the weld is too small, the shape of the weld is na...