Chemical Composition

Identification Symbol	UNS Number	Grade	Elements	Composition %
F55	S32760	25 chromium, 7 nickel, 3.5 molybdenum, modified with nitrogen and tungsten	Carbon	0.030 max
			Manganese	1.00 max
			Phosphorus	0.030 max
			Sulfur	0.010 max
			Silicon	1.00 max
			Nickel	6.00 - 8.00
			Chromium	24.00 - 26.00
			Molybdenum	3.00 - 4.00
			Copper	0.50 - 1.00
			Nitrogen	0.20 - 0.30
			Tungsten	0.50 - 1.00

Mechanical Properties

Property	Value
Tensile Strength, min, ksi [MPa]	109-130 [750-895]
Yield Strength, min, ksi [MPa]	80 [550]
Elongation in 2 in. [50mm] or 4D, min, %	25
Reduction or Area, min, %	45
Brinell Hardness Number, HBW	--

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.