15CrMoG alloy tube knowledge

Date:2024-01-19View:370Tags:15CrMoG alloy tube knowledge,15CrMoG alloy tube,alloy tube
15CrMoG alloy pipe is a hollow long steel material, which is widely used as a pipeline for transporting fluids, such as oil, natural gas, water, coal gas, steam, etc. In addition, when bending and torsional 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 commonly used to produce various conventional weapons, gun barrels, artillery shells, etc.
Classification of steel pipes: Steel pipes are divided into two categories: seamless steel pipes and welded steel pipes (seamed pipes). According to the cross-sectional shape, it can be divided into 15CrMoG alloy pipes and special-shaped pipes. Circular steel pipes are widely used, but there are also some square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal and other special-shaped steel pipes.

For steel pipes that are subject to fluid pressure, hydraulic tests must be carried out to check their pressure resistance and quality. If no leakage, wetting or expansion occurs under the specified pressure, they are qualified. Some steel pipes must also undergo hemming tests according to standards or requirements of the purchaser. , expansion test, flattening test, etc.

Seamless steel pipe: Seamless steel pipe is made by perforating steel ingots or solid tube blanks into capillary tubes, and then hot rolling, cold rolling or cold drawing. The specifications of seamless steel pipes are expressed in terms of outer diameter * wall thickness in millimeters. Seamless steel pipes are divided into two categories: hot-rolled and cold-rolled (dial) seamless steel pipes.

Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

In addition to general steel pipes, low- and medium-pressure boiler steel pipes, high-pressure boiler steel pipes, stainless steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled (rolled) seamless steel pipes also include carbon thin-walled steel pipes and alloy thin-walled steel pipes. , stainless thin-walled steel pipes, special-shaped steel pipes.

The outer diameter of hot-rolled seamless pipes is generally greater than 32mm, and the wall thickness is 2.5-75mm. The diameter of cold-rolled seamless steel pipes can be up to 6mm, and the wall thickness can be up to 0.25mm. The outer diameter of thin-walled pipes can be up to 5mm, and the wall thickness is less than 0.25mm. Rolling has higher dimensional accuracy than hot rolling.

General seamless steel pipes are made of hot-rolled or cold-rolled high-quality carbon structural steels such as 10, 20, 30, 35, 45, 16Mn, 5MnV and other low-alloy structural steels, or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steels. Seamless pipes made of 10 and 20 grade low carbon steel are mainly used for fluid transportation pipelines. Seamless tubes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors.

Generally, seamless steel pipes must ensure strength and flattening tests. 12Cr1MoVG alloy pipe is delivered in hot-rolled or heat-treated state; cold-rolled tube is delivered in hot or heat-treated state. Seamless steel pipes for low and medium pressure boilers: used to manufacture various low and medium pressure boilers, superheated steam pipes, boiling water pipes, water-cooled wall pipes and superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers, etc.

Hot-rolled or cold-rolled (dialed) seamless steel pipes made of high-quality carbon structural steel. Mainly made of No. 10 and No. 20 steel, in addition to ensuring the chemical composition and mechanical properties, hydrostatic tests, curling, flaring, flattening and other tests are required. Hot-rolled products are delivered in a hot-rolled state, and cold-rolled (rolled) products are delivered in a heat-treated state.

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United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.


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