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Chemical Composition

Grade Symbol UNS Number Alloy Elements Composition %
F11 Class 2 K11572 1.25% chromium,
0.5% molybdenum
Carbon 0.10 - 0.20
Manganese 0.30 - 0.80
Phosphorus 0.040 max
Sulfur 0.040 max
Silicon 0.50 - 1.00
Chromium 1.00 - 1.50
Molybdenum 0.44 - 0.65

Mechanical Properties

PropertyValue
Tensile Strength, min, ksi [MPa] 70 [485]
Yield Strength, min, ksi [MPa] 40 [275]
Elongation in 2 in. [50mm] or 4D, min, % 20
Reduction or Area, min, % 30
Brinell Hardness Number, HBW 143-207

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.