ASTM A479/A479M Specification
Condition 2—1100°F [595°C] minimum, 1400°F [760°C] maximum. Condition 3—1050°F [565°C] minimum, 1400°F [760°C] maximum. Types XM-30, 414, and 431 tempered materials shall be held at 1100°F [595°C], minimum for at least 1 h/in. [25 mm] of cross section. Maximum tempering temperature shall be 1400°F [760°C].