How to distinguish the good from the bad of thick - walled seamless tube? There are six ways to do this: 1, high quality composition is uniform, the thick wall seamless tube cold shearing machine high tonnage, cutting head end face smooth and neat, and shoddy material because the material is poor, cutting head end face often have meat, or uneven, and no metallic luster. And because the manufacturer of fake and inferior materials products cut the head less, the head and tail will appear big ears. 2. The pseudo-thick-walled seamless tube has no metallic luster and is of a reddish color or similar color to pig iron, for two reasons, its billets are adobe. The temperature of the fake and inferior materials is not standard, and their steel temperature is measured visually, so they cannot be rolled in accordance with the specified austenite area, and the performance of the thick wall seamless pipe cannot reach the standard naturally. 3. The material of the fake thick wall seamless pipe contains many impurities, and the density of steel is relatively small, and the size is seriously out of tolerance, so it can be weighed and checked without a vernier caliper. 4, and inferior thick-walled seamless tube cross section of the oval, because the factory in order to save material, the quantity of the finished product roll before 2 slants big, the strength of rebar is greatly decreased, but also do not conform to the standard of rebar shape size. 5. The surface of the seamless tube with fake thick wall is prone to scarring. There are two reasons: the pseudo thick seamless pipe with thick wall is not uniform in material and more impurities. Our guide equipment is simple and easy to stick steel. These impurities tend to scar after they bite people's roll.

Seamless steel tube brand - manufacturing process​ 1. Seamless steel tube brand - blank control 2. Seamless steel tube brand - quality planning control points 3. Seamless steel tube brand - inspection control

Several basic methods of seamless steel tube inspection: 1.Inspection of steel pipe geometry and appearance:​ 2. Chemical composition analysis: chemical analysis, instrumental analysis (infrared c-s instrument, direct reading spectrometer, zcP, etc.). 3. Physical and chemical properties of steel pipes: 4. Steel tube surface quality inspection: 100%

How to identify inferior seamless steel pipe? Here we identify through the following methods: First, poor quality seamless steel pipe surface is prone to scarring. Mainly due to two reasons: (1) There are many impurities in the inferior seamless steel tubes and the materials are not uniform. (2) Inadequate guide equipment for poor quality pipe manufacturers is particularly prone to sticking steel. Contaminated pipes tend to produce scars when they bite into the roll. Second, poor quality seamless steel pipe is prone to tube folding. The so-called folding is a variety of fold lines formed on the surface of the seamless steel pipe, and this defect often runs through the entire product. The reason for the folding is that the manufacturer is pursuing high efficiency in order to increase the output. In the production process, the amount of pressing is large, and ears are produced, and folding is easily generated in the next rolling process. The folded product is easily cracked after bending, resulting in a significant decrease in the strength of the pipe. Third, poor quality seamless steel pipe is prone to scratches, due to the poor production equipment of poor quality steel pipe manufacturers, the product is prone to burrs, scratch the surface of steel, deep scratches will reduce the strength of steel.

Definition： Carbon steel: mainly refers to the mechanical properties depends on the carbon content of the steel, generally does not add a large number of steel alloy elements, sometimes known as ordinary carbon steel or carbon steel. Carbon steel is also called carbon steel, and its carbon content is less than 2% WC carbon alloy. Carbon steel contains a small amount of silicon, manganese, sulfur, and phosphorus, which can be divided into carbon steel based on the use of carbon steel, carbon tool steel and easy cutting structural steel three carbon structural steel divided into structural steel and can be divided into low carbon steel (WC < 0.25%), medium carbon steel (WC 0.25%- 0.6%) and high carbon steel (WC> 0.6%). According to the content of phosphorus and sulfur, carbon steel can be divided into ordinary carbon steel (high phosphorus and sulfur content), high quality carbon steel (phosphorus and sulfur content is lower) high quality steel (phosphorus content, sulfur content is lower) carbon steel with higher carbon content, the higher the hardness, the higher the strength, but the lower the plasticity.

Use of carbon steel pipe: 1. mechanical industrial tube. Such as air structure tube (circular tube, elliptical tube, flat elliptical tube), axle tube, shaft tube, automobile and tractor tube, drag oil cooling pipe, farm square tube and rectangular tube, pressure variable tube and bearing pipe, etc. 2. petroleum geological drilling pipe. Such as: oil drilling rod, oil drilling rod (square drill pipe and six corner drill rod), oil tubing, casing and various oil pipes, geological drill pipe (core pipe, casing, movable drill rod, ring hoop and pin etc.)). 3. chemical industry tube. Such as: oil cracking pipes, chemical equipment, heat exchangers and pipes, stainless acid resistant pipes, chemical fertilizers, high pressure pipes and pipes conveying chemical media. 4. pipe pipe. Such as: water, gas pipeline, seamless pipe steam pipeline, oil pipeline, oil and gas dry pipe. Irrigation water faucets with pipes and sprinkler pipes. 5. heat equipment tube. For example, general boiler water pipe, superheated steam pipe, locomotive boiler superheater tube, smoke pipe, small tube, arch tube and high temperature and high pressure boiler tube. 6. other departments and management. Such as: vessel tube (high pressure cylinder and ordinary container), instrument tube, watch case tube, injection needle and medical device tube.

erw pipe weight

Spiral submerged arc welding (spiral) steel pipe is the full name of the hsaw pipe. The strip is sent to the welded pipe unit, multi roll rolling, and the strip is rolled up to form a circular pipe with opening clearance, adjusting the reduced extrusion roll to control the weld gap between 1 and 3mm, and make both ends of the weld flat. The spiral welded pipe is made of spiral material and welded by internal and external submerged arc welding, so as to produce different specifications of spiral welded pipe.

During the construction of natural gas and oil pipeline stations, the installation of valves, meters and flanges should be tapped in the main channel. It is difficult to identify the straight seam position of the base pipe by high-frequency resistance welding. The installation of some lugs is very close to the welding seam. Therefore, it is very necessary to deeply study and analyze the influence of the boss on the basic pipeline. In this paper, the residual stress distribution of high frequency longitudinal resistance welded pipe is analyzed, and the influence of welding position of different boss on residual stress is analyzed. The stress increases sharply and the longitudinal welding residual stress is affected when the boss installed on the ERW pipe is much larger than the parent pipe. ERW pipeline

The ERW welding machine technology is used to realize the high frequency welding of the electromechanical system. The high-frequency welding equipment is composed of a high-frequency welding machine and a forming machine. A high frequency welding machine is usually made up of two parts of high frequency generator and feed device. The effect is to produce high frequency current and control it. By extrusion roll frame, the function of the molding machine is high frequency current. The extrusion and melting part eliminates the oxide and impurities on the surface of the steel and makes the steel plate completely integrated into one. ERW pipeline

LSAW pipe fracture, hydraulic (pneumatic) parts in mechanical performance design, brittle fracture is also related to the temperature of parts.

The principle of seamless welding is gas shielded arc welding, known as gas shielded welding or gas welding, which uses arc as a heat source and gas as a protective medium. During the welding process, the protective gas is formed around the arc to form a protective gas layer, to isolate the arc and water pit, to prevent the influence of the harmful gas and to ensure the stable combustion of the arc. Gas shielded welding is classified according to electrode state, operation mode, protection gas type, electrical performance, polarity and application scope. Seamless welding Seamless welding is carried out according to specific conditions. Gas shielded welding can be used with different gases, and the commonly used protective gases are carbon dioxide, argon, helium, hydrogen and gas. The advantages of gas arc arc welding are: good wire arc, easy to centering, easy to weld in all position, automatic welding, small welding arc, small welding pool, fast welding speed, narrow heat affected zone, small deformation of welding position, strong crack resistance and good welding quality. The disadvantage is that it is not suitable for welding with windy grounds, and the arc radiation is stronger.

Seamless steel pipe weight calculation table, the actual component of seamless pipe is calculated according to the nominal size of steel and density (formerly known as the proportion) of the calculated component called the actual component. This length and size of steel, cross-sectional area and size tolerances are indirectly related.

The welding process of welding pipeline unit is complicated and changeable by using uncoiling, pinch, straightening, shearing, orientation, butt welding, looper, and medium. Welded pipe The concrete butt welding process is: 1, when the coil is positioned well, the conical head of the coiler can be inserted into the coil at the same time, the lead is sent to the roller, and the roller is rolled down, and the coil car and the magnetic roller can be returned in situ.

The quality of tube billet is the main factor to judge the quality of seamless pipe. In order to ensure the reasonable progress of the perforating process and obtain high quality seamless steel tubes, it is necessary to make strict requirements for the geometrical size of the tube, the microstructure and the low magnification of the surface.

The uneven deformation of seamless tube during cold drawing leads to additional stress. After cold drawing, this extra stress remains in the residual stress of the tube. The degree of non-uniform deformation of seamless steel tube determines the size and distribution of residual stresses. The deformation of the cold drawn steel is determined by the deformation characteristics. Because the tube wall processing does not involve the axis in drawing process, the thickness of the tube wall changes little after the deformation, so the deformation condition and the deformation condition of the inner and outer layers cause the seamless tube, which leads to the uneven deformation.

The seamless tube usually loses its bearing capacity at 450-650 degree C and experiences great deformation, resulting in bending of steel columns and steel beams. Therefore, they can not continue to use because of over deformation. Generally speaking, the fire resistance of unprotected seamless pipe is about 15 minutes. The length of time is also related to the heat absorption rate of the component. The following are several different fire prevention measures for seamless steel tubes.

LSAW welding machine is an automatic welding equipment, which can be automated through welding workpiece automation and mechanized linear welding. Straight seam welding machine, also known as automatic seam welding machine, longitudinal seam automatic welding machine, is an automatic welding machine. It can replace a lot of manpower, greatly improve the production efficiency and welding quality, reduce labor costs, and improve the working environment of welding workers. Such as the angle seam welding of the large transformer shell, the direct seam welding large cylinder, the direct seam welding of the solar water heater cylinder, the straight seam welding steel production line, the H type steel welding, etc., the straight seam welder is widely used.

The main equipment for the pipe production is as follows: Steel milling machine: machined metal plates are machined on both sides, forming the required shape at a time. And the parallelism of the two plates reaches the prescribed tolerance range, so as to prepare for manufacturing high precision steel pipes.

Advantages of LSAW pipes It can destroy the casting structure of steel ingots, refine the grain of steel, eliminate the defects of structure, make the steel structure compact and improve the mechanical properties. This improvement is mainly reflected in the rolling direction, so that the steel pipe is no longer isotropic to some extent; the dumping bubble, the crack and the loose stratum can also be welded at high temperature and high pressure. LSAW pipeline Sawing defect 1, the residual stress caused by unequal cooling. The residual stress is the internal self balancing stress in the absence of external force. All cross-sections of hot rolled steel have such residual stresses. The greater the size of the general section, the greater the residual stress. Although the residual stress is self balanced, the steel structure may have adverse effects on the external force, such as deformation, stability, fatigue and so on. 2, after welding, the non-metallic inclusions in the steel pipe are pressed into thin slices and stratified to reduce the thickness of the straight pipe, and the interlayer tear may occur when the weld is contracted. The local strain induced by welding shrinkage usually reaches several times the yield point strain, far greater than the strain induced by load.

ERW carbon steel tube has this processing technology, which has the advantages of post welding heat treatment, eliminating residual stress in weld and heat affected zone, refining grain, small heat affected zone and fast heating speed. It can greatly improve welding speed and weld quality. It can be used without pickling, shot peening and trimming steel as blank, and welding alloy at the same time. Steel, high alloy steel and non-ferrous metal pipe greatly reduce the power consumption of the unit, and equipped with a set of welding equipment can produce ERW carbon steel pipe.