steel tube

　　The seamless pipe line is mainly used for pumping high pressure oil and gas near the wellhead. As the corrosion problem of hydrogen sulfide is becoming more and more serious, the development of anti-sulfur seamless pipeline tube is urgent, and the anti-sulfur performance is the key. Discusses the influence of hydrogen induced crack (HIC) resistance of medium and material factors, Cu, Ni join can improve the performance of seamless line pipe material HTC reduce the S content in the steel, by spraying calcium silicon powder also can reduce the sensitivity of hydrogen bubble. 　　With the development of oil and gas exploration, the problem of hydrogen sulphide corrosion is very acute because of the increasing amount of oil and gas Wells in the complex and sulfur environment. In recent years, there has been an increase in demand for the seamless pipe line. The seamless pipeline pipe is mainly used for pumping high pressure oil and gas near the wellhead, and it is made by seamless tube p...

　　A tube is a closed shape used to perform some structural function. The shape can be round, square, rectangular or whatever can be designed and manufactured for a particular application. Round tubes differ from pipes in the way they are dimensioned. A 1 1/2-inch round tube has a 1 1/2-inch outside diameter. A 1 1/2-inch round pipe has a 1 1/2-inch inside diameter. The reason being that the outside of tubes is important for structures, however the inside of pipes is used for fluid flow. 　　 Welded Steel Tube 　　Welded steel tubing is made from either hot-rolled or cold-rolled steel that is provided to the tubing manufacturer in coils. The coil may be processed to remove scale, improve finish, amend heat treatment or in other ways to achieve the specified end product. The coil is then run through grooved rollers until the shape has been formed and the free edges are correctly spaced for welding. 　　The edges of the tube are butt welded together, generally with electrical resistance w...

　　A tube is a closed shape used to perform some structural function. The shape can be round, square, rectangular or whatever can be designed and manufactured for a particular application. Round tubes differ from pipes in the way they are dimensioned. A 1 1/2-inch round tube has a 1 1/2-inch outside diameter. A 1 1/2-inch round pipe has a 1 1/2-inch inside diameter. The reason being that the outside of tubes is important for structures, however the inside of pipes is used for fluid flow. 　 　 Seamless Steel Tube 　　The manufacture of seamless steel tube typically begins in an electric arc furnace. The steel is then cast as an ingot or continuously cast as a bloom. The bloom is then rolled into a billet. The solid billet becomes a tube by being drawn over a piercing tool by two external rollers set at an angle to each other that move the billet. At this point a “rough” tube has been formed. 　　The rough tube is put through an elongator, in which three rollers and an internal mandrel s...

　　Electric Resistance Welding (ERW) pipe is manufactured by rolling metal and then welding it longitudinally across its length. Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length. 　　In Seamless pipe, there are no welding or joints and is manufactured from solid round billets. The seamless pipe is finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD. Applicable in for High-pressure applications such as Hydrocarbon Industries & Refineries, Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles 　　etc. 　　ERW (Electric Resistance Welded) pipes are welded longitudinally, manufactured from Strip / Coil and can be manufactured upto 24” OD. ERW pipe cold formed from a ribbon of steel pulled th...

　　To identify that a pipe supplied is seamless or ERW , Simply read the stencil on the side of the pipe 　　If it is ASTM A53, Type S means seamless. 　　Type F is furnace but welded, 　　Type E is Electrical resist welded. 　　Thats how. It is the easiest way to identify wether pipe is seamless or ERW. 　　In short, Seamless is marketed on an outdated myth that it does not have flaws but that welded has an inherent flaw throughout the length of each tube, as stated above. Intuitively this concept is easily accepted by purchasers and designers with limited experience with the various products. Each product form and manufacturing method has its own inherent problems and potential defects.

　　Low carbon steel pipe has a large aging tendency, which means low carbon steel pipe has both quenching aging tendency and deformation aging tendencies. When the steel from the rapid cooling of high temperature, ferrite scraping carbon, nitrogen supersaturation, the formation of iron carbon nitrogen started slowly at room temperature. Which leads to the increase of strength and hardness, and the decrease of plasticity and toughness. This penomenon known as quenching aging. Low carbon steel pipe will produce aging even if not quenched and air cooled. 　　 Carbon steel pipe and nitrogen atoms interact with dislocations, and carbon and nitrogen atoms gather around the dislocation lines. This combination of carbon and nitrogen atoms and dislocation lines is called the Koch's air mass. It will increase the strength and hardness of steel and plasticity and toughness reduced, a phenomenon known as deformation aging. 　　Compared with quenching, deformation of low carbon steel pipe has a...

　　Under cold conditions a low-carbon steel welding, the cooling rate of the welded joint, which has made cracking tendency to increase, especially in the first weld Heavy structures susceptible to cracking, it is necessary to take the following process steps: 　　1) Do not possible under conditions of low temperature bending, correction and assembly weldments. 　　2) Preheat, 16Mn seamless steel pipe welding process strictly maintained interlayer temperature should not fall below the preheating temperature. 　　3) Hydrogen or ultra-low hydrogen welding. 　　4) The whole seam continuous welding should be completed to avoid interruption. 　　5) When positioning welding to increase the welding current, welding speed slows down, due to increase tack welds cross-sectional area and length, preheated if necessary. 　　6) Not be performed on a base material arc groove surface other than the need to fill the crater when extinction.