Abstract
In this article we justify the economic feasibility of using thermos-cyclic treatment of casing from economically alloyed steel 09G2S to produce the strength group Q125, in accordance with API 5CT. It was confirmed by the experiment that using a four-fold thermal cyclic quenching followed by a low-temperature tempering from the low-alloyed pre-eutectoid steel, it is possible to produce mechanical properties at the level: tensile strength 1068 MPa, conditional yield strength 1002 MPa, elongation 11.2 % and absorbed energy 64 Joules. In addition, an economic evaluation of the application in the production of high-strength casings from steel 09G2S, which allows reducing production costs by at least 11 %, due to thermal cycling.