Abstract: The effect of tempering temperature after quenching at 920 ℃ on the microstructure and mechanical properties of a deep well oil casing steel was studied with the help of optical microscope (OM), scanning electron microscope (SEM), tensile testing machine and other equipment. The results show that the test steel is tempered at 500-600 ℃ to obtain tempered troostite, which has high strength, plasticity and toughness. The fluctuation range of strength-plasticity product is 20.5-22.1 GPa·%, and the fluctuation range of impact absorption energy is 94.6-100.3 J. When the tempering temperature is 550 ℃, the deep well oil casing test steel has the best comprehensive mechanical properties. At this time, the tensile strength is 978 MPa, kekuatan hasil adalah 935 MPa, the strength-plasticity product is 22.1 GPa·%, and the impact absorption energy is 100.3 J. Kata kunci: oil casing steel; tempering temperature; microstructure; sifat mekanikal

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