High Speed Steel | Tool Steel | A10 Technical Data
Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1450°F (788°C), and hold at temperature for 2 hours. Cool at 20°F (11°C) per hour to 900°F (482°C) then air cool to ambient temperature. Reheat to 1150°F (621°C), hold for 6 hours, then air cool to ambient temperature. The resultant hardness should be a maximum of 269 HBW.