A steel pipe is steel with a hollow section and its length is much greater than its diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular, and special-shaped steel pipes; according to the material, it is divided into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes, and composite steel pipes; according to the purpose, it is divided into transportation pipelines, engineering structures, steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.; according to the production process, it is divided into seamless steel pipes and welded steel pipes, among which seamless steel pipes are divided into hot-rolled and cold-rolled (drawn) two types, welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes. SANVO is one of the high-quality steel pipe suppliers in China, and exports ASME, JIS, DIN standard carbon steel pipes, stainless steel pipes, galvanized steel pipes, black steel pipes, seamless steel pipes, and welded steel pipes.
This guide answers all the questions you have about steel pipes. If you have been looking for information about steel pipes, look no further.
You will find the most direct, yet detailed answers to basic questions, you often ask about carbon and stainless steel pipes.
Without further ado, here we go:
A steel pipe is steel with a hollow section and its length is much greater than its diameter or circumference. And steel pipes are used to transport products such as oil, gas, and water, and are suitable for long-term installations.
Steel pipe is not only used to transport fluids and powdered solids, exchange heat, and manufacture mechanical parts and containers, it is also an economical steel. The use of steel pipes to manufacture building structural grids, pillars, and mechanical supports can reduce weight, save metal by 20-40%, and can realize factory mechanized construction. Using steel pipes to manufacture highway bridges can not only save steel, simplify construction, but also greatly reduce the area of the protective layer, saving investment and maintenance costs.
There are many steel grades and specifications of steel pipe products, and their performance requirements are also various. All these should be differentiated according to user requirements or changes in working conditions. Generally, steel pipe products are classified according to cross-sectional shape, production method, pipe material, connection method, plating characteristics, and use.
According to the cross-sectional shape, it is divided into round, square, rectangular, and special-shaped steel pipes; according to the material, it is divided into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes, and composite steel pipes; according to the purpose, it is divided into transportation pipelines, engineering structures, Steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.; according to the production process, it is divided into seamless steel pipes and welded steel pipes, among which seamless steel pipes are divided into hot-rolled and cold-rolled (drawn) Two types, welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes.
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Carbon steel pipes are made of steel ingots or solid round steel through the perforation into capillary tubes and then made by hot rolling, cold rolling, or cold drawing.
Carbon steel pipes are divided into two types: hot-rolled and cold-rolled (drawn) steel pipes.
General carbon steel pipe: It is made of 10, 20, 30, 35, 45, and other high-quality carbon steels such as 16Mn, 5MnV, and other low-alloy structural steels or 40Cr, 30CrMnSi, 45Mn2, 40MnB, and other alloy steels by hot rolling or cold rolling. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transportation pipelines. Seamless pipes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors. Carbon steel pipes are generally used to ensure the strength and flattening test. Hot-rolled steel pipes are delivered in the hot-rolled state or heat-treated state; cold-rolled steel pipes are delivered in a heat-treated state.
Stainless steel pipe is a hollow long round steel, which is widely used in petroleum, chemical, medical, food, light industry, machinery and instrumentation, and other industrial pipelines and mechanical structural parts. In addition, when the bending and torsion strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also often used as furniture and kitchen utensils.
Stainless steel pipe is a kind of economical cross-section steel. It is an important product in the iron and steel industry. It can be widely used in life decoration and industry. Many people on the market use it to make stair railings, window guards, railings, furniture, etc. There are two common materials, 201 and 304.
Stainless steel pipe accounts for about 8% to 16% of the total amount of steel, and it has a wide range of applications in the national economy. Because the steel pipe has a hollow section, it is most suitable as a pipeline for liquid, gas, and solid transportation. At the same time, compared with round steel of the same weight, the steel pipe has a large section coefficient and high bending and torsion strength, so it has become a variety of machinery and building structures. Important material on the site. Structures and parts made of stainless steel tubes have a larger section modulus than solid parts under the same weight. Therefore, stainless steel pipe itself is a kind of economical section steel that saves metal. It is an important part of high-efficiency steel, especially in oil drilling, smelting, and transportation industries. The second is geological drilling, chemical industry, construction industry, machinery industry, aircraft, and automobile manufacturing, as well as boiler, medical equipment, furniture, and bicycle manufacturing also require large amounts of various steel pipes. With the development of new technologies such as atomic energy, rockets, missiles, and aerospace industries, stainless steel pipes have become more and more important in the defense industry, science and technology, and economic construction.
Stainless steel pipes are safe, reliable, hygienic, environmentally friendly, economical, and applicable. The thin-walled pipes and the successful development of new reliable, simple, and convenient connection methods give it more irreplaceable advantages for other pipes, and more and more applications in engineering, Use will become more and more popular, and the prospects are promising. Stainless steel combines performance, appearance, and use characteristics, so stainless steel will still be one of the best building materials in the world.
Seamless steel pipes are perforated from whole round steel, and steel pipes without welds on the surface are called seamless steel pipes. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, and top pipes. According to the cross-sectional shape, seamless steel pipes are divided into two types: round and special-shaped. Special-shaped pipes have square, oval, triangular, hexagonal, melon seed, star, and finned pipes. The maximum diameter is 900mm and the minimum diameter is 4mm. According to different uses, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes.
Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for the petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.
Welded steel pipes refer to steel pipes with seams on the surface that are welded after bending and deforming steel strips or steel plates into round or square shapes. The blanks used for welded steel pipes are steel plates or strip steels.
Welded steel pipes can be classified into straight seam welded pipes and spiral welded pipes according to the weld shape.
The straight welded pipe has a simple production process, high production efficiency, low cost, and rapid development.
The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. A narrower blank can be used to produce welded pipes with larger pipe diameters, and a billet with the same width can also be used to produce welded pipes with different pipe diameters. But compared with the straight seam pipe of the same length, the weld length is increased by 30-100%, and the production speed is lower. Therefore, most of the smaller diameter welded pipes adopt straight seam welding, and the large diameter welded pipes mostly adopt spiral welding.
And the spiral welded pipe is made by rolling low-carbon carbon structural steel or low-alloy structural steel strip according to a certain spiral angle (called forming angle) into a tube blank, and then welding the pipe seam together. It can be made with a narrower strip. Steel produces large-diameter steel pipes. Spiral welded pipes are mainly used for oil and natural gas pipelines, and their specifications are expressed by outer diameter * wall thickness. Spiral welded pipes can be welded on one side or on both sides. Welded pipes should ensure that the water pressure test, the tensile strength of the weld, and the cold bending performance meet the requirements.
As one of the quality steel pipe suppliers, manufacturers, exporters, factories, companies, and wholesalers in China, SANVO supplies carbon steel and stainless steel pipes. And we can meet the special requirements of customers and send samples for free. So, you can choose Hebei Sanvo Pipes And Fittings Co., Ltd. to buy or purchase good steel pipes, including carbon steel pipes, stainless steel pipes, galvanized steel pipes, black steel pipes, seamless steel pipes, and welded steel pipes.