1. 20G material heat treatment system: 900 ~ 930 ℃ normalizing, hot rolling pipe finishing temperature of not less than 900 ℃, can replace the normalizing.
2. 15CrMoG material heat treatment system: 930 ~ 960 ℃ normalizing. 680 ~ 720 ℃ tempering, holding time: cycle furnace is greater than 2h. Continuous furnace is greater than 1h.
3. 12Cr1MoVG material heat treatment system: 980 ~ 1020 ℃ normalizing, holding time by wall thickness per mm 1min, but not less than 20min. 720 ~ 760 ℃ tempering, holding time, cycle furnace is greater than 2h, continuous furnace is greater than 1h, when the wall thickness is greater than 30mm to 40mm, should be forced cooling; when the wall thickness is greater than 40mm, should be quenched and tempered, 990 ℃, tempering temperature of 720 ~ 760 ℃, holding time: cycle furnace is greater than 2h.
4. 1Cr18Ni9 material heat treatment system: solution treatment: solution temperature ≥ 1040 ℃.
