Oil casing in this after heat treatment, can effectively the progress of the oil casing of tensile strength, impact toughness and anti-damage function and so on, has great value in use.
At present the process in steel pipe processing plant has a different application, the quality assurance data show that after heat treatment of steel tube in 820-860 mpa, yield strength Rt0.6 tensile strength Rm in 910-940 mpa, impact toughness Akv between 65-85 - j, invulnerability function 100% qualified. Data show that 27 MNCRV steel tube is in proportion to high quality high grade oil casing pipe, on the other hand also shows that the temperature in the quenching process is steel products produced a very good way to avoid the high brittleness.
Low temperature quenching was lower than those of conventional temperature at the same time, reduced the quenching stress, thereby reducing the quenching deformation, it ensures the successful manipulation of the fruit of the oil casing pipe heat treatment, and car silk for subsequent processing provides a good raw material.
Heat treatment of oil casing need to strictly implement to ensure that the yield of oil casing with good product quality and function, and show good use value and function in use, high strength and toughness, heat treatment in different ways.
Oil casing is a kind of oil transportation or other material of pipeline, in use has good use function, users get the praise and love. Heating of oil casing produced according to certain temperature, in different temperature with different temperature control, 27 MNCRV steel AC1 = 736 ℃, AC3 = 810 ℃, the temperature quenching heating temperature when choosing between 740-810 ℃. The selected temperature quenching heating temperature 780 ℃, quenching heating heat preservation time of 15 min. After quenching tempering temperature 630 ℃, tempering heat holding time 50 min. Because in the alpha + gamma two-phase area temperature quenching heating, the retained quenching under state department did not dissolve ferrite, while maintaining high strength, toughness to get progress.