ERW Steel Pipe

 　　The straightness of seamless steel tubes is not up to standard and affects the processing? Recently, many customers have asked about the straightness of seamless steel pipes. After conversations, they found that these customers will have to process them later, and the steel pipes are too curved to cause a lot of trouble. In fact, the delivery status, size, and steel grade of steel pipes are all factors that affect the straightness of seamless steel pipes. Today I will take you to know about seamless steel pipes. What is the impact of bending that is not straight? 　　1. Because the steel pipe is not straight, have you encountered the following processing problems? 　　(1) Cutting rate 　　The bending of seamless steel tubes will cause a lot of trouble to customers during the cutting process. The steel pipes bend and jump, which is difficult to cut, and the cutting error is large, which directly causes the product yield rate to drop. 　　(2) Product accuracy 　　Product accuracy is the req...

 　　The seamless steel tubes are mostly medium and high-carbon alloy steels. After quenching, some of the subcooled austenite is not transformed into martensite, and it remains in the service state to become retained austenite, which affects the service performance. If it is placed below zero to continue cooling, it can promote the martensite transformation of retained austenite. Therefore, the essence of cold treatment is to continue quenching. The quenching stress at room temperature and the quenching stress at zero are superimposed, and when the stack response force exceeds the strength limit of the material, cold treatment cracks are formed. 　　Precaution: 　　(1) After the seamless steel tube is quenched and cold treated, the seamless steel tube is placed in boiling water for 30-60 minutes, which can eliminate 15%-25% of the internal quenching stress and stabilize the retained austenite, and then perform the conventional cold treatment at -60°C. Or carry out -120℃ cryogenic treatm...

 　　Do you know a common that threaten scaffolding safety? Here is the usual risk of the scaffolding construction. You can check here and find a way to decrease the risk in daily construction projects. 　　1. Falls from the scaffolding. The scaffolding without scaffolding safety nets or improper installation safety net. 　　2. Scaffolding collapse. Before the scaffolding installation, the company didn’t consider the material, workers, foundation stability, scaffolding plank placement. 　　3. Passerby being struck by falling materials. When the passengers walk past the scaffolding, some work parts ot scaffolding will fall down. It is very dangerous for the passengers. 　　 http://www.xysteelpipe.com/info/Common-risks-associated-with-scaffolding-construction-1955-1.htm

 　　Oil casing is mainly used to support the walls of oil, gas and water wells. It is an important guarantee for the normal operation of oil and gas wells after drilling and completion. Due to factors such as casing selection, quality, transportation, storage, and use, casing damage occurs from time to time, causing oil and gas wells to reduce production or even scrapping, causing significant economic losses to oil and gas companies. So, how to choose oil casing pipe? 　　According to the exploration and development deployment and drilling plan, the user needs to formulate a demand plan in advance, including model, steel grade, buckle type, wall thickness, length range, weight, quantity and special requirements, such as specification grade, thread grease type, thread protection type. 　　The key control points are as follows: 　　(1) Clarify the pipe type, steel grade, thread type, wall thickness, length range, weight, quantity and special requirements. 　　(2) Clarify casing standards, suc...

　　Generally, forging cracks will form at high temperatures. Due to the expansion of the cracks and exposure to air, under a microscope, the inside of the cracks is full of oxide scale, and both sides are decarburized. It is relatively fine, and the cracks are semi-decarburized rather than fully decarburized. 　　The welding cracks produced during the quenching process are obviously different from the cracks during the forging process. The welding heat treatment temperature is generally much lower than the forging temperature. Even for high-speed steel and high-alloy steel, the heating and holding time are much shorter than the forging temperature. 　　Due to high heating temperature, long holding time or fast heating speed, early cracking occurs during the heating process, resulting in cracks distributed along the coarse grain boundaries, and there is a slight decarburization structure on both sides of the crack. If the heating is too fast, early cracking will occur , There is no obvious d...

 　　Mechanical properties of oil casing pipe J55 and K55 in API 5CT specification: 　　1. Heat treatment 　　PSL1 requirements: In API 5CT, J55 and K55 require delivery in rolled state; 　　PSL2 requirements: In API 5CT, J55 and K55 oil casing should be normalized and tempered as a whole. 　　2. Tensile test 　　J55: Yield strength: 379MPa～552MPa; tensile strength ≥517MPa; minimum elongation of J55 is 19%; 　　K55: Yield strength: 379MPa～552MPa; tensile strength ≥655MPa; minimum elongation of K55 is 15%. 　　3. Impact test 　　J55 and K55 in API 5CT must be subjected to impact test. The minimum size sample impact test energy is 20J, and the minimum full size sample longitudinal impact energy is 27J. 　　4. Wall thickness inspection 　　PSL1: The wall thickness measurement of J55 and K55 has no coverage requirements; 　　PSL2: Wall thickness measurement J55 and K55 processing full length automatic detection system surface area best coverage rate should reach 25%. 　　5. Non-destructive testing 　　PSL1: J55 a...

 　　The content of seamless steel pipe & tube size inspection mainly includes: the wall thickness, outer diameter, length, curvature, ovality, end slope and blunt angle of the steel pipe, and the cross-sectional shape of the heterogeneous steel pipe. 　　(1) Inspection of steel pipe wall thickness 　　The traditional and commonly used steel pipe wall thickness inspection tool is the wall thickness micrometer. In the inspection room, the wall thickness of the steel pipe is measured one by one with the qualified thousand points. The end face of the steel pipe shall be measured at no less than 8 points, and the unqualified wall thickness shall be marked. The modern seamless steel pipe production unit uses ultrasonic equipment to detect and record the full length of the steel pipe wall thickness. 　　(2) Inspection of outer diameter and ovality of steel pipe 　　The tools used to check the outer diameter and ovality of steel pipes are mainly calipers and vernier calipers. During inspection,...

 　　The plastic-coated composite steel pipe for mining has the following characteristics: 　　(1) Flame retardant and antistatic 　　The product adopts mining polyethylene paint, and its antistatic and flame-retardant components are evenly distributed on the surface and inner layer of the pipe. It meets the requirements of MT181 and is suitable for flammable and explosive specific places in mines. 　　(2) Extremely strong adhesion 　　After the inner and outer surfaces of the plastic-coated steel pipe are coated, bonded, and cured, the adhesion force is ≥30N/10mm, and there is no damage after falling hammer impact and tearing. 　　(3) Corrosion resistance, not easy to scale, low fluid resistance 　　The pipe has strong acid and alkali resistance and corrosion resistance and is suitable for high-sulfur water and water containing calcium and magnesium plasma in coal mines. Because of its high surface finish, low fluid resistance, no scale adheres to it, and secondary pollution can be reduced. 　　(...

 　　The quality assessment process of ERW steel pipe consists of online non-destructive testing, metallographic inspection, flattening and flaring destructive tests, and hydraulic tests. Evaluation process: 　 　1. Online non-destructive flaw detection 　　Rotate the detection arm of the flaw detection station and place it in the straight seam welded pipe production line, observe the position of the weld through the camera, adjust the front and rear positions of the probe with the operating lever, make the weld and the laser coincide, and save the parameters. Input the coil number of steel strip through DATASERVR and DACQ computer. Observe the waveform display on the flaw detection interface. When the waveform exceeds the alarm line, compare the thickness measurement information to determine whether it is a defect wave or interference wave signal, and visually inspect the pipe to see if the waveform exceeds the alarm line. If the waveform exceeds the alarm line, an alarm will be issued....

 　　The production process of high-frequency welded pipes (ERW steel pipe) mainly depends on the type of product. From raw materials to finished products, a series of processes are required. The completion of these processes requires various corresponding mechanical equipment, welding, electrical control, and testing equipment. So, in the production of high-frequency welded pipes, what influence does the operation have on the welding quality? 　　1. Welding pressure 　　Welding pressure is one of the main parameters of the welding process. After the two sides of the tube billet are heated to the welding temperature, ordinary metal crystal grains are formed under the action of the extrusion pressure, that is, mutual crystallization produces welding. The welding pressure affects the strength and toughness of the weld. When the applied welding pressure is small, the welding edge of the metal cannot be completely suppressed, and the residual non-metallic inclusions and metal oxides in the w...

 　　Seamless steel tubes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Welded steel pipes for automobiles are one of the most important types of precision welded pipes. The main varieties are pipes for automobile transmission shafts, pipes for automobile mufflers, pipes for automobile condensers, pipes for automobile exhaust, pipes for automobile control shafts, and automobile thrust pipes. Automobile shock absorber oil storage pipe, etc. 　　The most widely used is the automobile exhaust system, which accounts for more than 1/2 of the total amount of automobile stainless steel. Automobile intake pipes, front pipes, hoses, converters, center pipes, and mufflers mainly use stainless steel welded pipes such as 409L and 436L. It is estimated that the downstream users of automotive stainless steel seamless pipes use about 1.5% of the stainless steel seamles...

 　　In daily steel purchases, the most annoying thing is the purchase of low-quality seamless steel tubes, which affects product quality. How to identify low-quality seamless steel tubes? Let's take a look at the methods that can be used to identify high-quality seamless steel pipes and inferior seamless steel pipes with the naked eye: 　　1. Inferior quality seamless steel pipes are prone to scars. 　　Mainly due to two reasons: 　　(1) Inferior seamless steel pipes have many impurities and uneven materials. 　　(2) Inferior pipe manufacturers have simple guide and guard equipment, which is especially easy to stick to steel, and the pipes containing impurities are prone to scars after biting into the roll. 　　2. Inferior quality seamless steel pipes are prone to pipe folding. 　　The so-called folding refers to the various fold lines formed on the surface of seamless steel pipes. Such defects often run through the longitudinal direction of the entire product. The reason for the folding is tha...