High-pressure boiler steel pipes: mainly used to manufacture high-quality carbon structural steel, alloy structural steel, and stainless heat-resistant steel seamless steel pipes for steam boiler pipes of high pressure and above. These boiler pipes are designed to work under high temperatures and pressure. , pipes will also undergo oxidation and corrosion under the action of high-temperature flue gas and water vapor. Therefore, steel pipes are required to have high lasting strength, high oxidation resistance, and good organizational stability. The steel grades used are: high-quality carbon Structural steel grades are 20G, 20MnG, 25MnG; alloy structural steel grades are 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rusty and heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tubes ensure chemical composition and mechanical properties. In addition, hydraulic pressure tests must be performed one by one, and expansion and flattening tests must be performed. Steel pipes are delivered in heat-treated conditions. In addition, there are also certain requirements for the microstructure, grain size, and decarburization layer of the finished steel pipe. Seamless steel pipes for geological drilling and oil drilling control; drilling rigs are used to drill wells to explore underground rock structures, groundwater, oil, natural gas, and mineral resources. The exploitation of oil and natural gas is inseparable from well drilling. Seamless steel pipes for oil drilling for geological drilling control are the main equipment for drilling, mainly including outer core pipes, inner core pipes, casings, drill pipes, etc. Since drilling pipes have to go deep into the stratum of several thousand meters, the working conditions are extremely complex. The drill pipes are subjected to stresses such as tension, pressure, bending, torsion, and uneven impact loads, as well as mud and rock wear. Therefore, pipes are required to It must have sufficient strength, hardness, wear resistance, and impact toughness. The steel used for steel pipes is represented by “DZ” (the Chinese pinyin prefix for geology) plus a number one to represent the steel yield point. Commonly used steel grades include DZ45 45MnB and 50Mn; DZ50’s 40Mn2, 40Mn2Si; DZ55’s 40Mn2Mo, 40MnVB; DZ60’s 40MnMoB, DZ65’s 27MnMoVB. Steel pipes are delivered in heat-treated conditions. Petroleum cracking tubes: Seamless tubes for furnace tubes, heat exchanger tubes, and pipelines in petroleum refineries. Commonly used are high-quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti). In addition to verifying the chemical composition and various mechanical properties of steel pipes, steel pipes must also ensure water pressure, flattening, flaring, and other tests, as well as surface quality and non-destructive testing. Steel pipes are delivered in heat-treated conditions. Stainless steel pipes: Hot-rolled and cold-rolled stainless steel pipes made of various stainless steels are widely used in petroleum and chemical equipment pipelines and stainless steel structural parts for various purposes. In addition to ensuring the chemical composition and mechanical properties, any steel pipe used to withstand fluid pressure is necessary to ensure that the hydraulic pressure test is qualified. Various special steel pipes must ensure conditions according to regulations.
Post time: Oct-16-2023