Chemical Composition

Identification Symbol	UNS Number	Grade	Elements	Composition %
F51	S31803	22 chromium, 5.5 nickel, modified with nitrogen	Carbon	0.030 max
			Manganese	2.00 max
			Phosphorus	0.030 max
			Sulfur	0.020 max
			Silicon	1.00 max
			Nickel	4.5 - 6.5
			Chromium	21.00 - 23.00
			Molybdenum	2.5 - 3.5
			Nitrogen	0.08 - 0.20

Mechanical Properties

Property	Value
Tensile Strength, min, ksi [MPa]	90 [620]
Yield Strength, min, ksi [MPa]	65 [450]
Elongation in 2 in. [51mm] 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.