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,...