Processing method of high-strength direct-connection type petroleum casing joint

The invention discloses a processing method of a high-strength direct-connection type petroleum casing joint, which relates to the technical field of ferrous metallurgy and machining, and comprises the following steps: S1, processing an external thread and a metal sealing surface of a petroleum casing blank after smelting, continuous casting, pipe rolling, upsetting and thickening and full-length heat treatment; s2, internal thread and metal sealing surface machining is conducted on the petroleum casing pipe blank subjected to external thread and metal sealing surface machining; and S3, the threads and the metal sealing face of the petroleum casing pipe blank subjected to internal thread and metal sealing face machining are subjected to surface treatment. According to the machining method, the cutting amount (cutting speed, cutting depth and number of times and feeding amount), the cooling mode and the clamping mode are tested, the defects that when the high-strength direct-connection type sleeve joint is mac