Seamless Steel Pipe

　　 Galvanized steel pipe 　　Due to its low price, superior performance, good fire performance and long service life, galvanized steel pipes are widely used in fire water supply systems, especially in automatic sprinkler systems, while plastic pipes (small pressure) are not suitable for fire water supply systems. Application. 　　 Copper tube 　　The most advantageous metal pipe is copper pipe. The copper pipe is used for a long time, and has many advantages. The pipe and pipe fittings are complete, the interface modes are various, and many applications are in the hot water pipe. 　 　Cast iron pipe 　　Compared with steel pipes, water-supply cast iron pipes are not easy to corrode, low in cost and good in durability, and are suitable for buried laying. The disadvantages are brittleness, heavy weight, and small length. The connection method is generally a socket connection. Clamp-type cast iron drain pipe is a new type of construction drainage pipe. It has entered the international ma...

　　 Exterior inspection 　　The appearance inspection of welded joints is a simple and widely used inspection method, which is an important part of the inspection of finished products, mainly to find defects and dimensional deviations on the surface of the weld. It is generally inspected by the naked eye and by means of tools such as standard templates, gauges and magnifiers. If there is a defect on the surface of the weld, there is a possibility of defects inside the weld. 　　 Density test 　　In welded containers for storing liquids or gases, the intimate defects of the welds, such as penetrating cracks, pores, slag inclusions, incomplete penetration and loose structures, can be found by compactness tests. The methods of compactness test include: kerosene test, water carrying test, water flushing test, etc. 　　 Strength test of pressurized containers 　　In addition to the sealing test, the pressure vessel is subjected to a strength test. There are two types of hydraulic pressure te...

　　The stainless steel tube does not easily rust and has a great relationship with the composition of the stainless steel. In addition to iron, stainless steel has chromium, nickel, aluminum, silicon, and the like. Generally, the chromium content of stainless steel is generally not less than 12%, and even high is even 18%. When chromium or other elements are added to the steel, the properties of the steel can be changed. For example, the molecular structure of the steel is more uniform, and a dense oxide protective film is more easily formed on the surface of the steel, thereby greatly improving the corrosion resistance of the stainless steel. Therefore, stainless steel can resist the corrosion of fire, water, acid, alkali and various solutions, and does not rust. Scientists have found that the more uniform the internal structure of steel, the more closely the various components are connected, the more difficult it is to invade corrosion, and the addition of an oxide protective film on...

　　 Galvanized steel pipe has the advantages of corrosion resistance, long service life, and the price of galvanized steel pipe is correspondingly low, so its usage rate is now higher and higher. But when users welding galvanized pipe. if didn't pay attention to it, there will be some unnecessary troubles occured. What problems should we pay attention to when welding galvanized pipes? 　　1. Polishing 　　The galvanized layer of the weld must be polished away, otherwise bubbles, trachoma, and false welding will occur. It also makes the weld brittle and the rigidity decreases. 　　2. The welding characteristics 　　Galvanized steel is generally coated with a layer of zinc outside the low carbon steel, and the layer is generally 20 um thick. Zinc has a melting point of 419 ° C and a boiling point of about 908 ° C. In welding, zinc melts into a liquid that floats on the surface of the bath or at the root of the weld. Zinc has a large solid solubility in iron, zinc liquid will deeply e...

　　In the production of seamless steel tubes, regular holes and pits are mainly caused by uneven deformation. The key to solving the problem lies in reducing uneven deformation. In order to solve this problem, the hot rolling seamless steel pipe can be improved by finely adjusting the continuous rolling mill, appropriately reducing the deformation of the continuous rolling mill, uniformizing the billet and capillary temperature, and reducing the vibration of the continuous rolling mill. 　　1. The approriate adjustment of the continuous rolling mill should follow the principle of equal flow and continuous flow, avoiding the reasonable amount of deformation while avoiding the rolling of the steel between the racks, and not allowing the holes of the previous mills to be overfilled or underfilled too. Seriously, the deformation of the rolling stock on each rolling mill should be relatively uniform. When the wear of the continuous rolls is severe, the influence of roll wear on the rolling ...

　　Stainless steel is resistant to corrosion and oxidation in low and high temperature because it contains chromium. This is what makes stainless steel different from mild steel or any other steel. Although tubes are not the cheapest option on the market, they have many benefits. Apart from being resistant to corrosion, which enables them to be useful in thin wall piping, they have low fluid friction properties and are easy to maintain, making them cost effective. They have been used in the construction of safe and long-lasting structures, like factories. 　　Different types of stainless steel tubes are made to withstand different environments, with varying temperatures. Here are several types of such tubes: 　　Austenitic: ductile, non magnetic and good for welding. It is used to make kitchen wares, large scale piping and containers. 　　Ferritic: same as austenitic, but a better resistant to corrosion. It is used in indoor equipment, like washing machines. 　　Austenitic-Ferritic (Du...

　　When it comes to the API, its name is definitely famous worldwide. The API refers to the American Petroleum Institute. Founded in 1919, it is the first national business association in the United States and one of the earliest and most successful standards-setting chambers in the world. As an international standard, it has long been engraved in the hearts of every steel practitioner. 　　There are a wide variety of API standards, including pipes, fittings, and steel components. The API SPEC steel pipe is roughly two parts: oil casing and line pipe. API 5L generally refers to the implementation standard for pipeline steel pipes, which are pipes used to transport oil, steam, water, etc. from the ground to oil and gas industrial enterprises. It includes two types of seamless steel pipes and welded steel pipes. The welded steel pipe pipes, which was commonly used in oil pipelines in China, are spiral submerged arc welded pipes (SSAW), straight seam submerged arc welded pipes (LSAW) and ...

　　The development status of 3PE anti-corrosion spiral steel pipe industry is still good at home and abroad, it also plays a relatively large role in the anti-corrosion industry. 3PE anti-corrosion steel pipe base material includes seamless steel pipe , spirally submerged arc welding pipe and longitudinally submerged arc welding pipe. The three-layer polyethylene (3PE) anti-corrosion coating has been widely used in the petroleum pipeline industry for its good corrosion resistance, water vapor permeability and mechanical properties. 　　The 3pe anti-corrosion steel pipe treatment process includes several steps of preheating, heating and cooling: 　　(1) The preheating of the rail head uses the power frequency power supply to inductively heat the rail head to 550~600 °C, the purpose of which is to improve the electrical efficiency during the late induction heating. For example, if the power supply and frequency are properly configured, the price of the spiral welded pipe can be directly i...

　　The development status of 3PE anti-corrosion spiral steel pipe industry is still good at home and abroad, it also plays a relatively large role in the anti-corrosion industry. 3PE anti-corrosion steel pipe base material includes seamless steel pipe , spirally submerged arc welding pipe and longitudinally submerged arc welding pipe. The three-layer polyethylene (3PE) anti-corrosion coating has been widely used in the petroleum pipeline industry for its good corrosion resistance, water vapor permeability and mechanical properties. 　　The 3pe anti-corrosion steel pipe treatment process includes several steps of preheating, heating and cooling: 　　(1) The preheating of the rail head uses the power frequency power supply to inductively heat the rail head to 550~600 °C, the purpose of which is to improve the electrical efficiency during the late induction heating. For example, if the power supply and frequency are properly configured, the price of the spiral welded pipe can be directly i...

　　China's steel pipe industry has a long history of nearly sixty years, but this can only be said to be the history of seamless steel pipes . Straight seam steel pipes are still a new thing compared to seamless steel pipes, it exists only a short ten years. But in this short span of ten years, the straight seam steel pipe encountered China's rapid development, which undoubtedly became the golden age of straight seam steel pipe development in China. In the past ten years, China's straight seam steel pipe industry continued to develop, innovate and surpass. At present, it has reached the world advanced level in terms of output, quality, type, technical level and production equipment. 　　The following is a brief introduction to this straight seam steel pipe that plays a pivotal role in China's development. 　　As the name implies, a straight seam steel pipe is a steel pipe whose weld is parallel to the longitudinal direction of the steel pipe. According to different produ...