steel tube

 　　Among the many piping materials, the most practical one is seamless steel pipe. This is a more powerful piping material, not only because of the wide range and scope of use of this piping material, but the more important point is Because the quality of seamless steel pipes is very good, the quality of seamless steel pipes is the reason why this pipe material has been promoted and developed in the industrial field. The quality of seamless steel pipes is very good, which is a complex production process of seamless steel pipes. It is decided that the biggest feature of seamless steel pipes is that there are no joints on the pipe wall, while ordinary pipes have obvious joints. It is because of the small feature of seamless steel pipes that this type of pipe material Can be used and promoted in the industrial field. 　　Seamless steel pipes (astm a106) are mainly used in pipeline transportation. They can be used to transport some fluids, such as the transportation of oil and natural ga...

 　　Magnetic particle testing or penetration testing of seamless steel tubes can effectively find surface defects such as surface cracks, folds, heavy skins, hair lines, pinholes, etc. For ferromagnetic materials, the magnetic particle detection method should be preferred because of its high detection sensitivity; for non-ferromagnetic materials, such as stainless steel seamless steel pipes, the penetration detection method should be used. 　　When there is less allowance for removal at both ends of seamless steel pipes, due to the structure of the detection device, the ends of the two ends are sometimes not effectively tested, and the ends are the most likely parts of cracks or other defects. If there is a potential crack tendency at the end, the heat effect of welding during installation may also cause the potential crack to propagate. Therefore, attention should also be paid to the inspection of a certain area of the seamless steel pipe after butt welding, and the extension of the ...

 　　Spiral steel pipe (SSAW) is a spiral steel pipe made of strip steel or coiled plate in a spiral shape, and double-sided submerged arc active welding for inner and outer seams. It is widely used in the production of water, electricity, chemical industries and other industries: Only by changing the forming point of view, steel pipes of various diameters can be produced from strip steel of the same width, which is easy to adjust. 　　Because it is formed in successive twists and turns, the length of the spiral tube is not restricted, and the length can be set at will. The spiral shape of the welding seam is evenly distributed on the circumference of the spiral tube, so the spiral tube has high dimensional accuracy and strong strength. It is easy to change the scale and is suitable for the production of small batches and various types of spiral pipes. 　　The weld seam of the spiral steel pipe is longer than the weld of the same standard straight seam pipe. Under the same standard wall ...

 　　How to prevent the spiral steel pipe (SSAW) from being damaged during transportation? 　　1. The fixed-length spiral steel pipe can be unbundled. 　　2. Both ends of the spiral steel pipe are provided with threaded fasteners, which should be protected by thread protectors. Apply lubricating oil or rust inhibitor on the thread. The two ends of the spiral steel pipe are broken. According to the requirements, the two ends can be equipped with nozzle protectors. 　　3. Spiral steel pipe packaging should be able to avoid looseness and damage during normal loading, unloading, transportation and storage. 　　4. If the customer requires that the spiral steel pipe should not be damaged by bumps or other damage on the outside, a protective device can be considered between the spiral steel pipes. The protective device can use rubber, straw rope, fiber cloth, plastic, pipe cap, etc. 　　5. Thin-walled spiral steel pipes can be supported by the inner tube or protected by the outer frame of the tube du...

 　　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. 　　(...