1. What is a seamless steel pipe for low and medium pressure boilers?
Seamless steel pipe 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 locomotive boilers. Superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes, etc. Use high-quality carbon structural steel hot-rolled or cold-rolled (drawn) seamless steel pipes. Mainly made of 10.20 steel, in addition to ensuring chemical composition and mechanical properties, water pressure tests, curling, flaring, flattening and other tests are required. Hot rolling is delivered in hot-rolled state. Cold rolling (drawing) is delivered in heat-treated state.
2. What is a high-pressure boiler steel pipe?
High-pressure boiler steel pipe: mainly used to manufacture high-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipes for steam boiler pipes with high pressure and above. These boiler pipes are usually operated under high temperature and high pressure. The pipes will also oxidize and corrode under the action of high-temperature flue gas and water vapor, so the 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: 15MoG., 20MoG., 12CrMoG., 15CrMoG, 12Cr2MoG, 12CrMoVG., 12Cr3MoVSiTiB, etc.;
Commonly used stainless heat-resistant steel: 1Cr18Ni9, 1Cr18Ni11Nb In addition to ensuring the chemical composition and mechanical properties, high-pressure boiler pipes must be subjected to water pressure tests, expansion and flattening tests. The steel pipes are delivered in a heat-treated state. In addition, there are certain requirements for the microstructure, grain size and decarburization layer of the finished steel pipe.
3. What is seamless steel pipe for geological drilling and oil drilling control?
Seamless steel pipe for geological drilling and oil drilling control; to explore the underground rock structure, groundwater, oil, natural gas and mineral resources, use drilling rigs to drill wells. Oil and natural gas extraction is inseparable from drilling wells. Geological drilling control and oil drilling seamless steel pipes are the main equipment for drilling, mainly including core outer tubes, core inner tubes, casings, drill pipes, etc. Since the drilling pipe has to work in the depth of several thousand meters, the working conditions are extremely complex. The drill pipe is subjected to stress such as tension, compression, bending, torsion and unbalanced impact load, and is also subject to mud and rock wear. Therefore, the pipe must have sufficient strength, hardness, wear resistance and impact toughness. The steel used for steel pipes is represented by "DZ" (the Chinese phonetic letter for geology) plus the number 1 to represent the steel yield point. Commonly used steel grades are DZ45's 45MnB.50Mn; DZ50's 40Mn2.40Mn2Si; DZ55's 40Mn2Mo.40MnVB; DZ60's 40MnMoB.DZ65's 27MnMoVB. Steel pipes are delivered in a heat-treated state.
4. What is a petroleum cracking pipe?
Petroleum cracking pipe: seamless pipe used for furnace tubes, heat exchanger tubes and pipelines in petroleum refineries. Commonly used high-quality carbon steel (10.20), alloy steel (12CrMo.15CrMo), heat-resistant steel (12Cr2Mo.15Cr5Mo), stainless steel (1Cr18Ni9.1Cr18Ni9Ti). In addition to the chemical composition and various mechanical properties of steel pipes, water pressure, flattening, expansion and other tests, as well as surface quality and non-destructive testing must be guaranteed. Steel pipes are delivered in a heat-treated state.
5. What is a welded pipe?
Welded steel pipe: also called welded pipe, is made of steel plate or steel strip after bending and then welding. According to the form of the weld, it is divided into straight seam welded pipe and spiral welded pipe. According to the use, it is divided into general welded pipe, galvanized welded pipe, oxygen-blown welded pipe, wire casing, metric welded pipe, roller pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welded thin-walled pipe, electric welded special-shaped pipe and spiral welded pipe. General welded pipe: General welded pipe is used to transport low-pressure fluid. Use Q195A.Q215A.Q235A
