A 387/A 387M series of products, Hold at 975°F (524°C) for 24 h, then cool at 10°F (5.6°C)/h to 925°F (496°C).
Hold at 925°F (496°C) for 60 h, then cool at 5°F (2.8°C)/h to 875°F (468°C).
Hold at 875°F (468°C) for 100 h, then cool at 50°F
ASTM A387 Grade 5 / A387 F5 steel plate/sheet is an alloy chromium molybdenum pressure vessel steel plate designed for use in boilers, pressure vessels and heat exchangers at high temperatures.
ASTM A387 Grade 5 / A387 F5 is defined by the ASTM/ASME A387/A387M standard differs from the other grades covered by the standard in the chromium and molybdenum content of the steel