Changsha Xiangjia Metal Materical Co., Ltd.

According to the different process requirements of different customers, there are various methods for the length measurement system of   straight seam steel pipe , mainly are the following types: 1. Raster ruler for length measurement Measuring the length with a raster ruler is to install two raster rulers of fixed length on the outside of both ends of the straight seam steel pipe. The raster ruler is driven by the pole columns close to both ends of the steel pipe, and the length of the straight seam steel pipe is measured by the interference phenomenon of light. The length measurement accuracy with a raster ruler is very high. However, the raster ruler is expensive and difficult to maintain, so it is very sensitive to the influence of dust and on-site vibration. 2. Camera for length measurement Measuring the length with a camera is to realize the measurement of the steel pipe length through image processing. The principle is to install a series of photoelectric switches at equal d...

The   X60 straight seam steel pipe   is a grade in the American standard. X60 is the steel grade stipulated by the American Petroleum Institute standard (APL). Its chemical composition: C is less than or equal to 0.28, and MN is less than or equal to 1.40. The yield strength (MPA) of the first-class product is greater than or equal to 414, and the tensile strength (MPA) is greater than or equal to 547. The yield strength (MPA} of the second-class product has a minimum value of 414, and the tensile strength (MPA) of the second-class product has a maximum value of 565. It is equivalent to the steel grade L415 stipulated in the GB/T9711.1 standard in China. X60 is equivalent to the steel grade L415 stipulated in the GB/T9711.1 standard in China. X42 is L290 in China. X52 is L390 in China.

In the cross-section of   straight seam steel pipes , there may be inconsistencies in the outer diameter, where the maximum and minimum outer diameters are not necessarily perpendicular. Ellipticity (or out-of-roundness) is defined as the difference between the maximum and minimum outer diameters. To control ellipticity, some steel pipe standards specify that ellipticity should not exceed 80% of the outer diameter tolerance. straight seam steel pipes exhibit curvature in the lengthwise direction, with the degree of curvature expressed in terms of bending. The standard specifications for bending generally fall into two categories: 1. **Local Bending**: Local bending is determined by measuring the chord height (in mm) at the point of maximum curvature using a one-meter long straight edge, with bending expressed in units of mm/m, for example, 2.5mm/m. This method is also applicable for determining bending at the pipe ends. 2. **Total Bending Along the Entire Length**: Total bending is...

Straight seam steel pipe   is divided into thick wall straight seam steel pipe and thin wall straight seam steel pipe, what is the difference between them? Let's talk about the detailed introduction: The difference between thick-walled straight seam steel pipes and thin-walled straight seam steel pipes is the thickness of the steel pipe wall. Generally, we believed that thin-walled steel pipes have a wall thickness/diameter < 0.02, and thick-walled steel pipes have a thickness > 0.02. In terms of use, thin-walled steel pipes wall steel pipes are used for pipeline. And the thick-walled straight seam steel pipe is mostly used for blanks of hollow parts, pressure bearings and important pipelines, such as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, high-precision structural pipes for automobiles, tractors, and aviation, etc. Changsha Xiangjia Metal Materical Co., Ltd.  specializing in the production and sales o...

The JCOE manufacturing process of   straight seam steel pipe   is a new type of welded steel pipe forming technology that emerged in the 1990s. The main forming process of this technology is to mill the edges of the pre-welded counterparts of the steel plates, then pre-bend in the width direction of the steel plates, to make it gradually formed in the order of J letter type → C letter type → O letter type. During the forming process, it has been punched many times, and each punch is formed by a three-point bending mold that is the basic principle. 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 annual will ensure the good quality and competitive duration of our products.

  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 ...

  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 complet...

Processing methods of   straight seam steel pipe . Forging: A pressure treatment method that uses the reciprocating impact of a forging hammer or the pressure of a press to change the steel into the shape and size as required.   Extrusion: Put steel into an extruder, and one end applies pressure to extrude the metal from the specified die hole to obtain the finished product of the shape and size. It is mainly used for the production of non-ferrous metal.   Rolling: Make the billet pass through the gap between a pair of rotating rollers, and reduce the cross-section of the material while increase the length due to the compression of the rollers. Drawing: This is a processing method of drawing and rolling metal blanks (profiles, pipes, products, etc.) through a die hole to reduce the cross section and increase the length. It is usually used for cold processing. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leading man...

Thick-walled   LSAW steel pipe   is outer diameter to wall thickness ratio is less than 20. They are used as petroleum geological drilling pipes, petrochemical cracking pipes, boiler pipes, bearing pipes, and high-precision structural pipes for automobiles, tractors, and aviation etc. The biggest difference between thick-walled LSAW steel pipe and thin-walled LSAW steel pipe is the thickness of the steel pipe wall. Generally, thin-walled LSAW steel pipes is wall thickness/pipe diameter <0.02. Thick-walled LSAW steel pipe is wall thickness/pipe diameter ＞0.02. Thin-walled steel pipes are used for pipelines. Thick-walled LSAW steel pipes are mostly used in blanks for hollow parts, pressure-bearing and important pipelines.

  The Wall thickness of   LSAW steel pipe : 8mm-50mm The thickness of LSAW steel pipe can be produced to 50mm, and the pressure of the press machine is limited which can not over 50mm. If you want a steel pipe thickness over 50mm, should take seamless steel pipe. The thinnest of LSAW steel pipe can be produced to 8mm. When producing LSAW steel pipes, pressed the plate into a round shape, so the wall thickness of the steel plate have requires. If the steel plate is too thin, the press machine cannot crush the steel plate or cause to severely deformed for too thin. So the thinnest LSAW steel pipe is 8mm. The wall thickness below 8mm is made by coiled pipes, which are all spliced section by section. It is different from straight seam.

  With the improvement of   LSAW steel pipe   weld quality and non-destructive flaw detection reliability, welded pipes are used more and more widely, replacing seamless steel pipes in more departments and applications. The growth rate of welded pipes is faster than seamless pipes, and the general trend of development This is. 　　   The high-frequency welding process has advantages in many aspects, and has a wide adaptability to the material of the tube blank and the specifications and dimensions of the steel tube. High-frequency welding not only improves the welding speed, but also obtains a weld with a small heat-affected zone and good penetration. 　　   In terms of quality, LSAW steel pipe has good weld quality, small internal and external burrs, high welding speed, and low power consumption. It can be widely used and promoted.   Changsha Xiangjia Metal Materical Co., Ltd.   the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of...

  LSAW steel pipe  needs to go through a series of processes from raw materials to finished products. The production process flow mainly depends on the product variety. The completion of these processes requires various mechanical equipment and welding, electrical control, and testing devices. These equipment and devices are in accordance with different The technological process requires a variety of reasonable arrangements.   LSAW steel pipe mainly uses the skin effect and proximity effect of high-frequency current to make the current highly concentrated on the edge to be welded, so that it can be heated to the welding temperature in one hundredth of a second, and then the squeeze roller Under the action of pressure welding.   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. Yea...

Processing methods of   LSAW steel pipe : 1 Forging : a pressure processing method that uses the reciprocating impact of a forging hammer or the pressure of a press to change the blank into the shape and size we need. 2 Extrusion: It is a processing method in which the steel puts the metal in a closed extruder and applies pressure at one end to extrude the metal from a prescribed die hole to obtain a finished product with the same shape and size. It is mostly used for the production of non-ferrous metal materials. 　　 3 Rolling: A pressure processing method in which a steel metal billet is passed through a gap between a pair of rotating rolls (various shapes), and the cross-section of the material is reduced due to the compression of the rolls and the length is increased.  　　 4 Drawing steel: It is a processing method in which rolled metal blanks (forms, tubes, products, etc.) are drawn through a die hole to reduce the cross-section and increase the length, which is mostly used...

  What should we do if we get oil stains in the process of using  stainless steel welded pipes ? How to remove oil stains without causing damage to stainless steel welded pipes?  　　 (1) Chemical degreasing adopts tank immersion method. The degreasing tank is made of steel plate, and the inner wall is covered with PVC or polyethylene.  　 　  (2) Use 12-15% nitric acid (by volume) for chemical degreasing treatment, the temperature is 40 ℃ -60 ℃ , and the time is 2-4 hours. psb.jpg  　 　 (3) When the stainless steel welded pipe is immersed in the tank, attention should be paid to the position to avoid air in the pipe.  　　 (4) During the soaking process, the stainless steel welded pipe should be moved up and down or flipped to make the inner cavity solution constantly replaced to improve the effect. If necessary, take out the stainless steel welded pipe, flush it with water and air, and then soak it.  　　 (5) Chemical degreasing until the surface of the ...

  1 The quality inspection and acceptance of   LSAW  shall be carried out by the technical quality supervision department of the supplier.  2 The supplier must ensure that the delivered LSAW meets the requirements of the corresponding product standard. The purchaser has the right to inspect and accept according to the corresponding product standards.  3 LSAW should be submitted for acceptance in batches, and the batching rules should meet the requirements of the corresponding product standards.  4 The inspection items, sampling quantity, sampling location and test method of LSAW shall be in accordance with the provisions of the corresponding product standards.  5 LSAW test results, when a certain item does not meet the requirements of the product standard, the unqualified shall be picked out, and a double number of samples shall be taken from the same batch of LSAW, and the unqualified item shall be re-inspected.   Changsha Xiangjia Metal Materica...

With the in-depth research of  LSAW and the extension of application fields, it is expected that in the future, the market demand for LSAW will continue to increase gradually, and the market capacity will continue to increase. The reasons are as follows:  　 　 1. Large-scale infrastructure construction stimulates domestic demand and brings stainless steel welded pipes such as highways, railways, and water conservancy;  　　 2. The rigid requirements of traditional application fields are the expansion of application fields brought about by the maturity of application technology;  　　   With the continuous adjustment of the market and the growth of demand, LSAW will usher in a new situation. Enterprises should continue to make new attempts and innovations, find breakthroughs, and be fully prepared for future development. Changsha Xiangjia Metal Materical Co., Ltd.   the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in Ch...

According to the classification of slag properties, the  LSAW  can be divided into two categories: acid welded pipe rod and alkaline welded pipe. The electrode whose slag is mainly acid oxide is called acid electrode. The electrode whose slag is mainly alkaline oxide and calcium fluoride is called alkaline electrode. Acid electrode: 1. Not very sensitive to water and rust, baking at 100 ～ 150 ℃  for 1h before use 2. Stable arc, AC or DC welding can be used 3. Large welding current 4. Long arc operation possible 5. Poor transition effect of alloying elements 6. The penetration depth is shallow, the weld formation is better 7. The slag is glassy and it is easy to remove the slag 8. Normal and low temperature impact toughness of weld 9. The weld has poor crack resistance 1o. The high hydrogen content of welds affects plasticity 11. Less smoke and dust during welding   Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the ...