Metallographic diagram of 12CrlMoV (normalized at 980°C, tempered at 720°C)
CrlMoV is an intermediate in the Cr-Mo series of alloy steel with a tempered martensite. This alloy is most often used in valves, pressure vessels, heat exchangers, and similar items. The CrlMoV alloy is heat treated by preheating to 980°C, followed by a positive temperature hold, and finally coo......