Heat treatment method of rare earth-containing acid service X60QS seamless steel pipe with wall thickness of 35mm

The invention discloses a heat treatment method of a rare-earth-containing acid service X60QS seamless steel pipe with the wall thickness of 35 mm. The heat treatment method comprises the technological processes of seamless steel pipe hot rolling, quenching furnace heating, quenching furnace heat preservation, discharging, water quenching, tempering furnace heating, tempering furnace soaking, tempering furnace heat preservation, discharging, air cooling, steel pipe sampling and detection analysis. The seamless steel pipe is discharged out of a furnace for air cooling after tempering heat treatment is finished, the economic thick-wall pipeline seamless steel pipe which is produced by combining alloying elements of C + Mn + V + Ti and is not the API 5L standard is subjected to water quenching and tempering heat treatment, so that various properties of the steel pipe are excellent, and specific performance indexes meet the following technical requirements: the yield strength is 415-565 MPa; the tensile strength