High-pressure boiler steel pipe: mainly used to manufacture high-quality carbon structural steel, alloy structural steel, and stainless heat-resistant steel seamless steel pipe for steam boiler pipes with high pressure and above pressure. These boiler pipes work under high temperatures and high pressure 1. The pipe will also be oxidized and corroded under the action of high-temperature flue gas and water vapor. Therefore, the steel pipe is required to have high durable strength, high oxidation resistance, and good structural 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 heat-resistant steel is commonly used in 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tubes to ensure chemical composition and mechanical properties In addition, hydrostatic tests should be done one by one, and flaring and flattening tests should be done. 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. Seamless steel pipes for geological drilling and oil drilling control; use drilling rigs to drill wells to find out the structure of underground rock formations, 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 core outer pipes, core inner pipes, casings, drill pipes, etc. Since the drilling pipe has to work deep into the formation depth of several thousand meters, the working conditions are extremely complicated. The drill pipe is subjected to stresses such as tension, compression, bending, torsion, and unbalanced impact loads, and is also subject to mud and rock wear. Therefore, pipes are required must have sufficient strength, hardness, wear resistance, and impact toughness. The steel used for steel pipes is represented by "DZ" (geological Chinese pinyin prefix) plus a number one to represent the yield point of the steel. The commonly used steel grades are 45MnB and 50Mn of DZ45; 40Mn2, 40Mn2Si of DZ50; 40Mn2Mo, 40MnVB of DZ55; 40MnMoB of DZ60, 27MnMoVB of DZ65. Steel pipes are delivered in a heat-treated state. Petroleum cracking tubes: seamless tubes for furnace tubes, heat exchanger tubes, and pipelines used in petroleum refineries. Commonly used high-quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. In addition to the chemical composition and various mechanical properties of the steel pipe, it is also necessary to ensure the 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 of various stainless steels are widely used in petroleum, chemical equipment pipelines, and stainless steel structural parts for various purposes. In addition to ensuring chemical composition and mechanical properties, steel pipes are used to withstand fluid pressure To ensure that the hydrostatic test is qualified. All kinds of special steel pipes shall be guaranteed according to the regulations.