ERW Steel Pipe

　　 Carbon steel and stainless steel are both metals that are used in a wide array of commercial and consumer applications. The main difference between the two is in the components that are added to the steel to make it useful for its intended purposes. 　 　Carbon steel vs Stainless steel 　　Steel is an alloy made out of iron and carbon. The carbon percentage can vary depending on the grade, and mostly it is between 0.2% and 2.1% by weight. Though carbon is the main alloying material for iron some other elements like Tungsten, chromium, manganese can also be used for the purpose. Different types and amounts of alloying element used determine the hardness, ductility and tensile strength of steel. While in Carbon Steel, Carbon as the main alloying element. In carbon steel, the properties are mainly defined by the amount of carbon it has. For this alloy, the amounts of other alloying elements like chromium, manganese, cobalt, tungsten are not defined. 　　Stainless steel has a high chro...

　　Seamless, by definition, means “perfectly consistent,” but many people get confused by terms like “seam-free” and “welded-and-drawn” when it comes to selecting tube. Seamless tubing, welded tubing, and seam-free tubing all appear to be consistently free of seams, but a closer examination reveals big differences. 　 　Characteristics 　　316 stainless tube offers increased corrosion resistance, because it is 100% seam-free without any longitudinal or orbital welds. Seamless stainless tube begins as molten steel, which is refined and cast in to a billet.Plug drawing tube diagram The billet is extruded into a seamless pipe that is then reduced to a smaller size using a pilger mill, which utilizes a mandrel to support the internal diameter. After the reduced pipe is cleaned and annealed, it goes through a cold-drawing process. This process uses a die to reduce the outer diameter and a plug to maintain the inner diameter. After the reduced pipe is cleaned and annealed, it goes through a ...

　　 Stainless steel pipes are used because of their corrosion resistance in a wide variety of service environments, usually without additional coatings. In certain circumstances, however, stainless steel components or structures may require a coated (paint) finish. Examples of this may include company colour schemes or logos, environmental blending and compatibility, and general aesthetic requirements. 　　Coating systems for stainless steels must be carefully selected to provide sufficient durability to meet the requirements of the service environment and its associated operating conditions. The combination of surface preparation and formulation of the paint system are key factors in meeting these objectives. In certain environments, localised breakdown of the coating can lead to corrosion, which may be more severe than that experienced with un-coated surfaces and may result in high, localised, rates of attack. 　　In general, stainless steels have flatter and smoother surfaces than c...

　　The seamless steel pipe ferrule is a pipe that will be cut off according to the pipe diameter. Generally, the pipe diameter is 15~32 mm, the 40~50 mm set is three times, and the 70 mm or more set is 3 ~4 times is appropriate. Several common methods of Threading are now introduced as follows: 　　1. Use a Threading Machine to thread the tube and clamp the tube on the Threading Machine Chuck, and leave the appropriate length to clamp the chuck, align the plate number, and put the good die on the appropriate position of the scale according to the pipe diameter. Hold the fixed plate machine, align the lubricant tube with the wire head, push the plate to the appropriate length, and gently loosen the trigger. 　　2. Use manual ferrule ferrule, first loosen the fixed plate machine, retract the reticle plate plate to zero degree, align the plate with the good stencil according to the sequence number, align the plate with the required scale, tighten the fixed plate machine, and tighten the pi...

　　Oil and gas spiral steel pipe corrosion means to slow or prevent pipeline in internal and external medium under the action of chemical, electrochemical, or eroded by microbial metabolic activity and metamorphism. 　　First of all, to prevent third-party damage and oil and gas spiral steel pipe corrosion. Although assumes primary responsibility for third-party damage to subsea pipeline owner, it can not say nothing to do. Many countries of the laying of submarine oil and gas pipelines have stringent industry standards, such as burying insufficient proof would be difficult to provide adequate protection anchors, which requires pipeline owners guidance in strict accordance with industry standards in the laying process, meticulous to achieve adequate protection of the anti-anchor depth, while the laying of the competent authorities to deal with the construction quality oversight of those. In such a shallow Bohai Bay, for example, taking into account the characteristics of the seabed, th...

　　High-precision cold drawn seamless carbon steel pipe abroad is generally increased in the metal alloy approach to improve material performance in the cold drawn seamless steel pipe, after all need to stress annealing, to eliminate residual stress of materials, to improve the organization of materials,improve the plastic material, thus preventing the purpose of seamless steel pipe fracture failure occurs. 　　At present, the common cold drawn seamless steel tube material are 45 # or 20 # steel 27SiMn steel, deformed by cold drawing of metal strength increases; However, it is at the expense of metal plasticity, toughness is the price.High-precision cold drawn seamless steel pipe is its high dimensional accuracy and high strength properties and market-based, it must ensure that the deformation within a certain range, in order to maximize the performance of materials to reduce materialadversely affected.Cold drawn seamless steel tube deformation is too small to achieve the surface finis...

　　X52 hot rolled steel strip requirements for erw steel pipe. 　　1. The allowable deviation of the width of the steel strip is 0- +20mm; 　　2. The inner diameter of the steel strip is 762mm, the allowable deviation is ±20mm, and the outer diameter is not more than 2150mm; 　　3. The radius of the steel belt is not more than 20mm per 10 meters; 　　4. The steel strip should be firmly wound into a roll, and the end faces should be as flush as possible. The height of the tower on one side of the coil should not exceed 50 mm; 　　5. The total length of the irregular head and tail of the steel strip shall not exceed 1000mm; 　　6. The weight of the steel strip is 20-28 tons. When the requirements of outer diameter and weight are met, the maximum value should be taken as much as possible. 　　 http://www.xysteelpipe.com/info/X52-hot-rolled-steel-strip-for-erw-steel-pipe-1278-1.htm

　　The most common defects for seamless steel pipe is uneven wall thickness. For example carbon steel pipe, thickness deviation from the capillary puncher at least 7.5%, reducing the elongation rolling to 4.5% increase to 7% after expanding, then after tension reducing to 4.5%. 　　 Seamless steel pipe wall thickness deviation performance reasons: 　　Since puncher in the head with a perforated plunger between the first support frame centering rollers cantilever structure is formed, so that the head during piercing irregular beating, so the head will be uneven force within the tube, causing the wall thickness deviation. 　　 Manufacturing precision equipment and structures 　　Since the stability of the perforator roll and the guide plate is poor, so that the device generates a large jump in the perforation, the impact of the tube thickness of the device manufacturer; old structure and centering rollers on the roller and is generally due to the lower roller is not an institution drive,...

　　Press LSAW steel pipe and spiral welded pipe is divided into Longitudinal. Longitudinal simple consumer technology, consumption and high efficiency, low interest rates, to carry out fast. The strength of spiral steel pipe common than straight seam high, can narrow the larger diameter structural steel pipe billet consumption, but also the width of the blank with the same consumption of different diameter pipe. But with the same length of straight seam pipe compared to the weld length of 30 to 100% and the consumption rate is low. Thus, the smaller diameter pipe actually use straight seam steel pipe, large diameter spiral welded pipe is mostly used. 　　Welded steel pipe issteel or steel plate with a bending round, square and other shape and then welded into the surface of the pipe joints. Welded steel consumption process is simple. Types of specifications, equipment, less capital, but the average strength of less than seamless. Since the 1930s, with the consumption of high-quality st...

　　LSAW (Longitudinal double submerge arc welding) carbon steel pipe is a type of SAW pipe made of steel plates that were hot rolled by JCOE or UOE forming technology. JCOE technology represents the shaping and forming processes involved during manufacturing as well as the inner and outer welding and cold expansion carried out after welding. 　　The LSAW large diameter steel pipe manufacturing process is explained in the steps below: 　　1. Plate Probe: This is used for manufacturing the large diameter LSAW joints right after it enters the production line which is the initial full-board ultrasonic testing. 　　2. Milling: The machine used for milling does this operation through two-edged milling plate to meet the requirements of the plate width and the sides parallel to the shape and degree. 　　3. Pre-curved side: This side is achieved by using a pre-bending machine on the pre-bending plate edge. The plate edge needs to meet curvature requirement. 　　4. Forming: After the pre-bending ...