20CrGoG, 12CrMoG, 12CrMoG, 12CrMoVG, 12Cr3MoVSiTiB, etc .; rust heat-resistant steel commonly used 1Cr18Ni9,1Cr18Ni11Nb high-pressure pipe (2) steel pipe, steel pipe, steel pipe, stainless steel pipe, In addition to ensuring the chemical composition and mechanical properties, to do the water pressure test, to be flaring, flattening test. The steel pipe is delivered in heat treatment. In addition, the finished steel pipe microstructure, grain size, decarburization layer also has certain requirements. Geological drilling and oil drilling and control of seamless steel pipe; to explore the underground rock structure, groundwater, oil, natural gas and mineral resources, the use of rig drilling wells. Oil and natural gas mining is more inseparable from drilling, geological drilling and control oil drilling with seamless steel pipe is the main drilling equipment, including the core of the outer tube, core tube, casing, drill pipe and so on. As the drilling pipe to drill into the depth of several kilometers to work, the working conditions are extremely complex, the drill pipe to bear the pull, pressure, bending, torsion and uneven impact load and other stress, but also by the mud, rock wear and tear, therefore, Must be of sufficient strength, hardness, wear resistance and impact toughness, steel with steel "DZ" (geology of the Chinese phonetic prefix) plus a representative of the steel yield point, commonly used steel DZ45 45MnB, 50Mn; DZ50 40Mn2, 40Mn2Si; DZ55 40Mn2Mo, 40MnVB; DZ60 40MnMoB, DZ65 27MnMoVB. The tubes are delivered in heat treatment. Petroleum cracking tubes: Tubes for heat refineries, heat exchangers and seamless pipes for pipes. 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 chemical composition and a variety of mechanical properties, but also to ensure that water pressure, flattening, flaring and other tests, and surface quality and non-destructive testing. The steel pipe is delivered in heat treatment. Stainless steel pipe: stainless steel with a variety of stainless steel, cold-rolled stainless steel tube, widely used in petroleum, chemical equipment, pipelines and various uses of stainless steel structural parts, in addition to ensuring chemical composition and mechanical properties, where used to withstand fluid pressure To ensure that the hydraulic test qualified. All kinds of special steel pipe to ensure the conditions required.