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How are seamless steel pipes made? What are the theoretical weight specifications of seamless steel pipes?

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 　　A steel pipe made of a whole piece of metal with no seams on the surface is called a seamless steel pipe . Seamless steel pipes have a hollow cross-section and are widely used as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water and certain solid materials. According to the cross-sectional shape, seamless steel pipes are divided into round and special-shaped ones. Special-shaped pipes have square, oval, triangle, hexagon, melon seed, star, winged pipes and many other complex shapes. The following is a complete table of theoretical weights of seamless steel pipes, seamless steel pipe sizes and allowable deviation tables. 　　How are seamless steel pipes made? 　　1. Main production process of hot-rolled seamless steel pipes (△ Main inspection process): 　　Pipe blank preparation and inspection△→Pipe blank heating→Pipe perforation→Pipe rolling→Steel pipe reheating→Sizing (reducing) diameter→Heat treatment△→Finished pipe straighte
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National Standard Properties of 304 Stainless Steel Plate

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　　 304 stainless steel plate tensile strength (Mpa) 520 　　Yield strength of 304 stainless steel plate (Mpa) 205-210 　　Elongation rate of 304 stainless steel plate (%) 40% 　　304 stainless steel plate hardness HB187 HRB90 HV200 　　The density of 304 stainless steel is 7.93 g/cm3. Austenitic stainless steel generally uses this value. The chromium content (%) of 304 is 17.00 to 19.00, and the nickel content (%) is 8.00 to 10.00304, which is equivalent to 0Cr19Ni9 (0Cr18Ni9) stainless steel in China 　　304 stainless steel is a versatile stainless steel material with stronger rust resistance than the 200 series stainless steel material. It also has good resistance to high temperatures. 　　304 stainless steel has excellent rust resistance and good intergranular corrosion resistance. 　　For oxidizing acids, it was found in experiments that 304 stainless steel has strong corrosion resistance in nitric acid below boiling temperature with a concentration of ≤ 65%. It also has good cor
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Welding stainless steel

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 　　When corrosion resistance is important, stainless steel is one of the most popular materials. Its abundant chromium and other alloy elements, as well as the structural characteristics of carbon steel, make it a very useful material for many projects. However, not all stainless steel is easy to weld, and it can be said that certain grades of stainless steel are not weldable at all. Therefore, to provide assistance, this article will focus on introducing some of the best grades of welded stainless steel. 　　austenitic stainless steel 　　Austenitic stainless steel can be welded together using many different welding processes. Some are more suitable for welding than others, such as 304, 308, 316, 321, and 347, all of which are weldable austenitic grades. 　　However, it should be noted that these grades may be subject to intergranular corrosion as their carbon content is relatively high. When chromium in stainless steel combines with carbon instead of forming a protective chr
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Differences between 304 and 316 stainless steel

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 　　Austenitic stainless steel is usually used when selecting stainless steel that must withstand corrosive environments. Austenitic stainless steel contains a large amount of nickel and chromium, which has excellent mechanical properties and corrosion resistance. In addition, many austenitic stainless steels are weldable and formable. The two more commonly used austenitic stainless steel grades are 304 and 316. To help you determine which brand is suitable for your project, this blog will study the differences between 304 and 316 stainless steel 　　304 stainless steel 　　Grade 304 stainless steel is usually considered the most common austenitic stainless steel. It contains high nickel content, usually between 8% and 10.5% by weight, while chromium content is high, about 18% to 20% by weight. Other major alloying elements include manganese, silicon, and carbon. The rest of the chemical composition is mainly iron. 　　The large amount of chromium and nickel gives 304 stainless
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Stainless steel welding process

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 　　Curved metal, charcoal colored welds, and a sense of frustration; These are some things that may happen when welding stainless steel. Although it contains elements similar to carbon steel, stainless steel adds alloying elements such as chromium and molybdenum, and presents completely different challenges when fusing two or more stainless steels instead of carbon steel. The oxygen around the stainless steel melt pool must be maintained at an absolute minimum level. The behavior of the molten pool is different from that of aluminum or carbon steel. The thermal conductivity of stainless steel is much smaller, which makes deformation and heat input a significant problem. Although there are many considerations when welding stainless steel, one of the most important decisions to make is which welding process to use. 　　Stainless steel welding process 　　Below, we will discuss the most popular welding processes used for stainless steel. 　　Metal Inert Gas (MIG) welding/Gas Meta
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The difference between stainless steel and galvanized steel

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 　　Without protection, ordinary carbon steel is still prone to rusting in most environments. Therefore, there are many ways to modify steel to prevent corrosion. Two popular solutions are to use stainless steel or galvanized steel. Although both types of steel can resist rust and corrosion, there are important differences between them that should be understood. 　　What is stainless steel? 　　Stainless steel can resist corrosion because its chemical composition contains additional alloying elements. Although ordinary carbon steel is mainly composed of iron and carbon, stainless steel adds a large amount of chromium to help it resist corrosion. Chromium, sometimes with other alloying elements, is added to stainless steel during the initial melting process and then forms any specific shape. 　　What is galvanized steel? 　　Galvanized steel is a type of steel coated with a layer of zinc, which helps prevent rusting of the underlying steel. This layer is usually very thin, usuall
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What are the applications of real bars, shear bars, and edge bars?

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 　　Shear and edge bars are the most commonly used types of stainless steel flat bars because they are cheaper, easier to obtain, and the final dimensional accuracy and finish are sufficient to meet most applications. These mainly include structural and architectural applications. 　　Due to additional costs, True Bar is only used when high tolerances or surface polishing continuity are required. These applications include precision machinery, such as machinery in the pharmaceutical or food industry, chemical sensitive applications such as chemical processing, or applications that require product consistency to ensure safety, such as in the aviation industry.
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