Chemical Composition

Identification Symbol	UNS Number	Grade	Elements	Composition %
F61	S32550	26 chromium, 6 nickel, 3.5 molybdenum with nitrogen and copper 255	Carbon	0.040 max
			Manganese	1.50 max
			Phosphorus	0.040 max
			Sulfur	0.030 max
			Silicon	1.00 max
			Nickel	4.5 - 6.5
			Chromium	24.00 - 27.00
			Molybdenum	2.9 - 3.9
			Copper	1.50 - 2.50
			Nitrogen	0.10 - 0.25

Mechanical Properties

Property	Value
Tensile Strength, min, ksi [MPa]	109 [750]
Yield Strength, min, ksi [MPa]	80 [550]
Elongation in 2 in. [50mm] or 4D, min, %	25
Reduction or Area, min, %	50
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.