ERW Steel Pipe

　　The seamless steel pipe manufacturing process starts with a solid, round steel billet. This billet is then heated to great temperatures and stretched and pulled over a form until it takes the shape of a hollow tube. As steel pipe suppliers will tell you, there are three great advantages to making a pipe in this way. 　　Increased Pressure Ratings 　　The greatest advantage of seamless steel pipes is their increased ability to withstand pressure. The weakest point in a welded steel pipe is the welded seam. But because a seamless steel pipe has not been welded, it doesn’t have that seam, making it equally strong around the entire circumference of the pipe. 　　It is also much easier to determine pressure calculations without being required to take weld quality into consideration. 　　Although seamless pipe can sometimes be more expensive than welded pipe, this increased ability to withstand pressure allows you to use pipes that are thinner and lighter, which can help cut down on expen...

　　 Advantages Of Welded 　　 Welded pipes are typically more cost effective than their seamless equivalents. 　　Welded pipes are usually more readily available than seamless. The longer lead time required for seamless pipes can not only make timing problematic, but it also allows more time for the price of the materials to fluctuate. 　　The wall thickness of welded pipes is generally more consistent than that of seamless pipes. 　　The internal surface of welded tubes can be checked before manufacturing, which isn’t possible with seamless. 　　 Advantages Of Seamless 　　The main perceived advantage of seamless pipes is that they don’t have a weld seam. Traditionally, the seam of welded pipes has been viewed as a weak spot, vulnerable to failure and corrosion. For many years, this fear was probably justified. However, in recent years improvements in the manufacturing process for welded steel pipes and other welded pipes have boosted the strength and performance of the weld seam to l...

　　When purchasing steel pipe fittings, it’s important to take into consideration certain factors, most importantly size and shape, to ensure that it is a perfect match for your specific purpose. However, another important aspect to consider is the material used in the making of the pipe fitters. Certain elements added to the steel, such as carbon and chrome, can dramatically affect its strength and appearance. Here are a few great reasons to invest in carbon steel pipe fittings as well as chrome plating. 　　Durability 　　Steel is one of the most popular types of pipe fittings and has been used for construction of pipes and pipe fittings for years because of its durability and strength. However, carbon steel, or plain-carbon steel, has the ability become much stronger through heat treatment. The more carbon added to the steel, the stronger it can become, which is why it is considered one of the strongest types of steel. Another way to increase the durability is to create a harder sur...

　　Stamping elbow is used in water supply pipe, water vapor pipeline, gas pipeline , oil pipeline connection. Stamping elbow color is black, right angle camber, excellent quality, wear resistance, not easy to damage. Stamping elbow standard is 1/2-10 inch, the products are widely used in petroleum, chemical, metallurgy, electric power and other professional pipeline equipment, equipment, matching and other effects. 　　Here is the characteristics of stamping elbow 　　First, the environmental protection: PE-RT can be used to recover, do not pollute the environment. PEX can not be recovered will be secondary pollution; stamping elbow pipe development trend: stamping elbow material not only has qualified the creep rupture curve and the pipe price moderate, construction relative to other types of convenience, convenient, connection methods are attributed to the standard at this stage is the most reliable inter penetration of hot melt connection method, pipe parts of aperture is greater tha...

　　In terms of the connection method, the seamless pipe can achieve the basic level of seamless welding through a new welding method. The conditions of his free cutting and the different appearance shapes can satisfy the aesthetics of each building and the needs of various industries. 　　In the process of purchasing goods, consumers must have clear shopping goals. For a variety of manufacturers to have a comprehensive understanding, in order to allow a large number of seamless steel pipe products, get good quality maintenance. In terms of construction, professional technicians 　　can carry out effective operation of products according to different market types, in order to achieve the maintenance of the highest product strength. He can guarantee the quality, guarantee the distribution price of his products, and apply it to various industry fields to achieve the fundamental 　　goal of the expansion of the project distribution platform. 　　1. The quality of the pipe and intermediate p...

　　In the seamless pipe mandrel mill process, a solid round steel billet is used. The billet is charged into a rotary hearth furnace. After the billet is discharged from the rotary hearth furnace, a small hole is punched into its end. This indentation acts as a starting point to aid in rotary piercing. 　　Rotary piercing is a very fast and dynamic rolling process that cross rolls the preheated billet between two barrel-shaped rolls at a high speed. The cross rolling causes high tensile stresses at the center of the billet. The design of the piercer rolls causes the metal to flow along the roll and over a piercer point as it exits the process. The piercer point is a high-temperature, water-cooled alloy tool designed to allow the metal to flow over it as a pipe shell forms from the rotary process. Once the pierced pipe shell is produced, it is immediately transferred to the floating mandrel mill. 　　The floating mandrel mill comprises eight rolling stands using 16 rolls and a set of ma...

　　1, a basic overview of the spiral tube structure 　　Compared with general materials, stainless steel not only has beautiful appearance, smooth surface, but also has outstanding characteristics such as low temperature resistance, high temperature resistance, high strength and corrosion resistance. Therefore, it is widely used in pipe materials. However, argon gas must be used as a shielding gas during the spiral pipe welding process. Obviously, the technical content is high and the difficulty is relatively large. Regardless of any problems with the welding material, temperature control, process and welder current, the spiral tube may be affected. The quality and level of welding, reducing its anti-corrosion, anti-seepage and other properties, so that the pipeline can not play its due role and benefits, will naturally cause damage to the enterprise, and even serious safety accidents. It can be seen that it is necessary to strengthen the control of the quality of the welded structure ...

　　When welding spiral tubes, among the many common welding problems, it is common to have air bubbles at the welds. In particular, the large-diameter spiral tube weld holes not only affect the tightness of the pipe welds, but also cause the pipeline to leak and become corroded. Induced points, severely reduce weld strength and toughness. The factors causing the pores in the weld are: moisture, dirt, scale and iron filings in the flux, welding composition and thickness, steel surface quality and steel edge treatment, welding process and steel tube forming process. Flux composition. When the solder contains an appropriate amount of CaF2 and SiO2, it absorbs a large amount of H2 and generates HF which is highly stable and insoluble in the liquid metal, thereby preventing the formation of hydrogen pores. 　　Bubbles occur mostly in the center of the bead. The main reason is that hydrogen is still hidden inside the weld metal in the form of bubbles. Therefore, the measure to eliminate this ...

　　Standard martensitic stainless steels are: 403 stainless steel, 410 stainless steel, 414 stainless steel, 416 stainless steel, 416 (Se stainless steel), 420 stainless steel, 431 stainless steel, 440A stainless steel, 440B stainless steel and 440C stainless steel. The corrosion resistance of these steels comes from "chromium". "The chromium content ranges from 11.5 to 18%. The higher the chromium content, the higher the carbon content of the steel to ensure the formation of martensite during heat treatment. The above three types of 440 stainless steel are rarely considered to be welded. Application, and the filler metal of the 440 type component is not easy to obtain. 　　Martensitic stainless steel is mainly low carbon or high carbon steel with a chromium content ranging from 12% to 18%. There are three types of martensitic stainless steel grades as follows: 　　1. Low carbon and medium carbon 13% Cr steel. 　　2. High carbon 18% Cr steel. 　　3. Low carbon nickel (ab...

　　The strengthening methods of metal materials mainly include the following aspects: 　　(1) Crystallization strengthening. Crystallization enhancement is to improve the properties of the metal material by controlling the crystallization conditions and obtaining good macroscopic structure and microstructure after solidification crystallization. it includes: 　　1) Refine the crystal grains. Refining the crystal grains can make the metal structure contain more grain boundaries, and the grain boundary can inhibit the sliding deformation, so that the metal material can be strengthened. It also improves toughness, which is impossible with other reinforcement mechanisms. 　　2) Purification strengthening. In the casting process, the liquid metal is sufficiently purified to minimize inclusions, which can significantly improve the performance of the solid metal. Inclusions have a great influence on the properties of metallic materials. In damaged components, a large amount of inclusions are o...