High-pressure pipe steel grade introduction

The steel grades used are: high-quality carbon structural steel grades are 20G, 20MnG, 25MnG; alloy structural steel grades are 15MoG, high-pressure pipes
20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rust-resistant heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure pipes, in addition to ensuring the chemical composition and mechanical properties, must be tested for water pressure, expansion and flattening. 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 pipes. Seamless steel pipes for geological drilling and oil drilling control; in order 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 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, casing, drill pipes, etc.
Drilling pipes have to work deep into the formation at a depth of several thousand meters, and the working conditions are extremely complex. The drill pipes are subjected to stresses such as tension, compression, bending, torsion and unbalanced impact loads, and are also subject to mud and rock wear. Therefore, the pipes must have sufficient strength, hardness, wear resistance and impact toughness. The steel used for steel pipes is represented by "DZ" (the Chinese pinyin abbreviation for geology) plus a number to represent the steel yield point. Commonly used steel grades are 45MnB and 50Mn for DZ45; 40Mn2 and 40Mn2Si for DZ50; 40Mn2Mo and 40MnVB for DZ55; 40MnMoB for DZ60 and 27MnMoVB for DZ65.
Steel pipes are delivered in a heat-treated state.
Oil cracking pipe: seamless pipe used for furnace tubes, heat exchanger tubes and pipelines in oil 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 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 the heat-treated state.
Stainless steel pipe: stainless steel pipes made of various hot-rolled and cold-rolled stainless steel pipes are widely used in pipelines of petroleum and chemical equipment and stainless steel structural parts for various purposes. In addition to ensuring the chemical composition and mechanical properties, all steel pipes used to withstand fluid pressure must ensure that the water pressure test is qualified. Various special steel pipes must be guaranteed according to regulations.