Under what circumstances is seamless steel pipe used, and is there any difference between steel pipe

Seamless steel pipes are very versatile. Seamless steel pipes for general purpose are rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, with the largest output, and are mainly used as pipes or structural parts for transporting fluids2. It is divided into three categories according to different uses**

a. According to chemical composition and mechanical properties**; b. According to mechanical properties**; c. Press the water pressure test**. According to the steel pipe of class A and B**, if it is used to withstand liquid pressure, it is also necessary to carry out a hydrostatic test. 3. Seamless pipes for special purposes include seamless pipes for boilers, seamless pipes for chemical power, seamless steel pipes for geology and seamless pipes for petroleum.

Seamless steel pipes have a hollow cross-section, and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round bar, steel pipe has the same bending and torsional strength, and is lighter in weight, which is an economical cross-section steel.

It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle racks and steel scaffolding used in building construction, etc., which can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing man-hours, and have been widely used in steel pipe manufacturing.

Steel withered silver answer; What is the difference between a pipe and a seamless pipe 1. The processing technology is different.

1.The seam steel pipe is made of high-quality carbon steel or alloy steel. The processing technology of seamless steel pipe includes cold drawing method and hot rolling method, while seamed pipe is generally welded.

2.Different uses. Seamless steel pipes are mainly used as pipes or structural components to transport fluids, mainly in the machinery industry.

Seamed steel pipes are mainly used for fluid and gas transportation in the construction industry, such as low-pressure fluids such as water, gas, and compressed air. Pressure pipes are generally made of seamless steel pipes.

<>3.Under normal circumstances, the pressure that the seamed steel pipe can withstand is less than 20 kg, which is a safe use range. It is usually used for low-pressure fluids such as water, gas, and compressed air.

Seamless pipes can withstand ultra-high pressure, of course, their wall thickness will increase, which needs to be designed according to the required pressure, and is often used in high-pressure and high-pressure equipment such as high-pressure oil pipes and boiler tubes. There are also seamless pipes for structural use, depending on the design requirements. At present, there are several seamed steel pipes for seamless treatment, annealing of the weld, and the pressure range is basically the same as that of seamless steel pipes.

Consider using. There are also some seamed steel pipes on the market that are made into seamless steel pipes by drawing or rolling with core head after overall heating, and the specifications are smaller, and such steel pipes only belong to seamless steel pipes in appearance, and their essence is not very ideal.

4.Differences in use. Seamless steel pipes are made of cold drawn and hot drawn, and are generally used for medium pressures equal to or greater than. The seamed steel pipe is made of high-frequency welding with butt after the steel plate is formed

First, the chemical composition is different:

There are slight differences between the chemical composition of seamless steel pipes GB T 8163-2008 and GB 9948-2013 standards, and the main difference in chemical composition is in P and S content.

Second, the use is different:

GB8163 steel pipes are tested for hydraulic testing one by one or ultrasonic, eddy current and magnetic flux leakage flaw detection. Therefore, in the standard selection of pressure pipeline steel pipes, it is not appropriate to use GB8162 standard.

Generally, 9948 steel pipes are mainly used to manufacture water wall pipes, boiling water pipes, superheated steam pipes, superheated steam pipes for locomotive boilers, large and small smoke pipes and arch brick pipes.

9948 seamless steel pipes are mainly used to manufacture superheater tubes, reheater tubes, air guide pipes, main steam pipes, etc. for high-pressure and ultra-high-pressure boilers.

Third, the standard production is different:

20 seamless steel pipes produced according to GB 9948-2013 standard can replace 20 seamless steel pipes produced according to GB T 8163-2008 standard. 9948 and 8163 are national technical standards. 8163 special steel pipe for fluid.

9948 special steel pipe for petroleum cracking.

Steel pipes produced according to GB T8163 are only used for general fluids. Because the GB3087 standard is higher than the GB T8163 standard in terms of allowable deviation of wall thickness, bending test, low magnification inspection and surface quality.

In addition, the GB3087 standard also stipulates the high temperature strength requirements, so the seamless steel pipe of GB T8163 cannot be used instead of GB3087.

Under the condition that the maximum test pressure is not more than 10MPa, the steel pipe produced according to GB3087 standard can replace the steel pipe produced according to GB T8163 standard. When the wall thickness of the steel pipe is 15mm, pay attention to the wall thickness of the steel pipe when substituting.

Seamless steel pipe is made of steel pipe with a whole round steel perforated and no welds on the surface. 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, pipe jacking, etc. According to the cross-sectional shape, seamless steel pipes are divided into two types: round and special-shaped, and special-shaped pipes have a variety of complex shapes such as square, oval, triangular, hexagonal, melon-seed-shaped, star-shaped, and winged tubes.

Seamless steel pipe is made of steel pipe with a whole round steel perforated and no welds on the surface. 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, pipe jacking, etc. According to the cross-sectional shape, seamless steel pipes are divided into two types: round and special-shaped, and special-shaped pipes have a variety of complex shapes such as square, oval, triangular, hexagonal, melon-seed-shaped, star-shaped, and winged tubes.

Seamless steel. The material is mostly .

Chromium-molybdenum high-alloy steel (mostly military guns).

stainless steel (10 percent chromium, mostly used to make competition-grade barrels).

In fact, there is no fixed standard for this thing, mostly according to the tactical requirements of different types, and the raw materials used by Shenzen in the corresponding materials are generally alloy steel, manganese, tungsten, chromium, molybdenum, nickel, etc., according to the characteristics of the elements, most of them belong to the list of metal elements that need to be synthesized....(The effect of the liquid such as chromium is to reduce the wear of the bullet on the barrel and improve the life of the barrel...)）

If you don't even care about longevity, you can use high-carbon steel, and the early 53 is high-carbon steel.

Liaocheng Qingguo Precision Steel Pipe: Seamless steel pipe is a kind of hollow steel pipe made of solid round steel by heating, perforation, rolling or cold drawing, which is different from welded steel pipes, which requires the welding process of steel plates or thin-walled steel strips.

Seamless steel pipe can be divided into hot rolling and cold drawing, in the hot rolling mode, through the heated solid billet into a tube, on the outer diameter and inner diameter of the tube billet using rolling arm and roll rolling, so that seamless steel pipe with various specifications and processing accuracy can be manufactured; In the cold-drawn method, the billet is heated to a certain temperature and then enters the stretching machine for stretching, and seamless steel pipes of different sizes and shapes are manufactured through the drawing process, and the surface of the pipe obtained by the cold-drawn method is smoother than that of hot-rolled pipes, and the precision is higher, and the time and cost are relatively higher.

Because the non-gear frontal steel pipe does not need to go through any imitation welding process in the manufacturing process, its internal and external surfaces are smooth, the internal structure is uniform, the strength and density are high, the compressive performance is large, the high temperature resistance, high pressure resistance and corrosion resistance are superior, and it is widely used in petroleum, chemical, metallurgy, machinery, aviation and other industrial fields, and also has a wide range of market demand and application value.

Wuxi Duorunde steel pipe **** (I will answer); Seamless steel pipes and precision alloy pipes are two different types of pipes, and they have some differences in production process, material, dimensional accuracy, performance, etc.

Automobile manufacturing, military industry, mechanical processing, electronic equipment, medical equipment, construction machinery, railway locomotives, aerospace, ships, injection molding machines, die-casting machines, machine tool processing bureau letter wheels, diesel engines, petrochemical plants, power stations, boiler equipment, Wuxi Duorunde steel pipe; Official website

First of all, seamless steel pipe is a kind of pipe without Tongxin welded joints, which is mainly made of steel ingots or solid pipe blanks through hot rolling, cold drawing or extrusion processes. The production process of this kind of pipe is relatively simple and simple, and the cost is relatively low, so it is widely used in construction, machinery, petroleum, chemical, aerospace and other fields. The material of seamless steel pipe can be ordinary carbon steel, alloy steel, stainless acid resistant steel, etc., which is used to transport various gases and liquids.

In contrast, precision alloy tube is a higher quality tube with higher dimensional accuracy and better performance. It is mainly made of tube blanks composed of various alloying elements through hot rolling, cold drawing or extrusion processes. There are many kinds of materials for precision alloy tubes, and different materials can be selected according to different uses and requirements, such as stainless steel, nickel-based alloys, titanium alloys, copper alloys, etc.

Precision alloy pipes have the advantages of high strength, high corrosion resistance, high wear resistance, and good sealing performance, so they are widely used in machinery, automobiles, petroleum, chemical industry, aerospace and other fields, especially in occasions with high requirements.

In general, the main differences between seamless steel pipes and precision alloy pipes are in terms of production process, materials, dimensional accuracy, and performance. Seamless steel pipes have a lower cost and are widely used in various fields, while precision alloy pipes have higher quality and performance and are mainly used in more demanding occasions. When selecting pipes, it is necessary to select the appropriate pipes according to the actual needs and application scenarios to achieve the best use effect and economic benefits.

Seamless steel pipe is a steel pipe without welded cavity head, which is manufactured through a continuous production process. Compared with welded steel pipes, seamless steel pipes have the following characteristics:

1.Manufacturing process: Seamless steel pipe is processed from a piece of integral round steel by solid perforation or hot rolling, cold rolling, etc., without welded joints.

2.Internal and external surface quality: The inner and outer surfaces of seamless steel pipes are smooth and have no welding marks. This gives seamless steel pipes an advantage in applications that require high surface quality, such as liquid transfer.

3.Strength performance: Due to the absence of welded joint parts, the strength and toughness of seamless steel pipes are generally better than those of welded steel pipes. Seamless steel pipes have higher reliability and safety when subjected to higher internal pressure or external loads.

4.Dimensional accuracy: The dimensional accuracy of seamless steel pipes is high, and products that meet the specified size can be produced according to customer requirements.

Seamless steel pipes are widely used in petroleum, chemical, natural gas, shipbuilding, electric power, construction and other industries, and have been widely used in occasions that require high strength, high quality and strict dimensional accuracy.

Seamless steel pipe is a round, square, rectangular steel with a hollow section and no joints around the perimeter.

1. Seamless steel pipe is made of steel ingots or solid pipe blanks perforated into capillaries, and then made by hot rolling, cold rolling or cold dialing. Seamless steel pipe has a hollow section, a large number of pipes used to transport fluids, steel pipes compared with solid steel such as round steel, when the bending and torsional strength is the same, the weight is lighter, it is an economic section steel, widely used in the manufacture of structural parts and mechanical parts, such as steel scaffolding for oil drills, etc.

Second, the characteristics of seamless steel pipes:

1. The thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the greater the processing cost will rise;

2. The process of the product determines its limited performance, and the general seamless steel pipe has low precision: uneven wall thickness, low brightness of the inner and outer surfaces of the pipe, high cost of sizing to the length of the pipe, and there are pittings and black spots on the inner and outer surfaces that are not easy to remove;

3. Its detection and shaping must be processed offline. Therefore, it reflects its superiority in terms of high pressure, high strength, and mechanical structure materials.