Seamless steel pipes for geological drilling and oil drilling: In order to explore the underground rock structure, groundwater, oil, natural gas and mineral resources, drilling rigs are used to drill wells. The exploitation of oil and natural gas is inseparable from well drilling. Seamless steel pipes for geological drilling and oil drilling 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 condition.
