METHOD OF PRODUCTION OF THE PETROLEUM PUMPING RODS Russian patent published in 2006 - IPC C21D8/00 C21D7/13 

FIELD: petroleum mechanical engineering; methods of production of the petroleum pumping rods.

SUBSTANCE: the invention is pertaining to the field of petroleum mechanical engineering and may be used for manufacture of the petroleum pumping rods out of the low-carbon steels of the invention of type 20N2M, 15X2GMF, 20XGNM and others. The technical result of the invention is improvement of characteristics of strength, pliability for the low-carbon steels, conditions for the personnel to fulfill their functions at simultaneous reduction of labor input and prime cost. The method includes the pressing of the pumping heads by GKM machine, normalization, straightening, machining of the heads. The new thing is application of electrotempering of the pumping bars at the temperature of 480-500°C after pressing of the heads by GKM machine with the following dressing by stretching at the temperature of 180-200°C with the force of (0.3-0.5) δ₀₂ and the surface-plastic deformation of the filleted corner and an adherent section of the bar in length of 300-500 mm with the force of rolling of (0.7-0.8) δ₀₂ by the profile rollers.

EFFECT: the invention ensures improvement of characteristics of strength, pliability for the low-carbon steels, conditions for the personnel to fulfill their functions at simultaneous reduction of labor input and prime cost.

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