Chemical Composition

Identification Symbol	UNS Number	Grade	Elements	Composition %
F53	S32750	25 chromium, 7 nickel, 4 molybdenum, modified with nitrogen 2507	Carbon	0.030 max
			Manganese	1.20 max
			Phosphorus	0.035 max
			Sulfur	0.020 max
			Silicon	0.80 max
			Nickel	6.00 - 8.00
			Chromium	24.00 - 26.00
			Molybdenum	3.00 - 5.00
			Copper	0.50
			Nitrogen	0.24 - 0.32

Mechanical Properties

Property	Value
Size	≥ 2 in. [50 mm]G	> 2 in. [50 mm]G
Tensile Strength, min, ksi [MPa]	116 [800]	106 [730]
Yield Strength, min, ksi [MPa]	80 [550]	75 [515]
Elongation in 2 in. [50mm] or 4D, min, %	15	15
Reduction or Area, min, %	--	--
Brinell Hardness Number, HBW	310 max	310 max

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.