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Chemical Composition

Grade Symbol UNS Number Alloy Elements Composition %
F21 K31545 chromium-molybdenum Carbon 0.05 - 0.15
Manganese 0.30 - 0.60
Phosphorus 0.040 max
Sulfur 0.040 max
Silicon 0.50 max
Chromium 2.7 - 3.3
Molybdenum 0.80 - 1.06

Mechanical Properties

PropertyValue
Tensile Strength, min, ksi [MPa] 75 [515]
Yield Strength, min, ksi [MPa] 45 [310]
Elongation in 2 in. [50mm] or 4D, min, % 20
Reduction or Area, min, % 30
Brinell Hardness Number, HBW 156-207

Heat Treatment

After hot working, forgings shall be cooled to a temperature below 1000 °F [538 °C] prior to heat treating in accordance with the requirements.