Common tube and tree heat treatment conditions

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Pipe category, Nominal composition, Pipe grade, Heat treatment temperature (?°C), Heating rate, Holding time, Cooling rate: Carbon steel – C 10, 15, 20, 25; 600–650. When the heating temperature reaches 400°C, the heating rate should not exceed 205×25/T °C/h. The holding time should be 1 hour for every 25 mm of wall thickness, with a minimum of 15 minutes. During the holding period, the maximum and minimum temperature differences should be below 65°C. After holding, the cooling rate should not exceed 260×25/T °C/h, and it must not be greater than 260 °C/h; cooling can occur naturally at temperatures below 400°C. Medium and low alloy steels: C-Mn – 16Mn, 16MnR; 600–650. C-Mn-V – 09MnR; 600–700. 15MnR; 600–700. C-Mo – 16Mo; 600–650. C-Cr-Mo – 12CrMo; 600–650. 15CrMo; 700–750. 12Cr2Mo; 700–760. 5Cr1Mo; 700–760. 9Cr1Mo; 700–760. C-Cr-Mo-V – 12Cr1MoV; 700–760. C-Ni – 2.25Ni; 600–650. 3.5Ni; 600–630. Note: T – Pipe thickness.