Special Metals INCOLOY® 25-6HN Super-Austenitic Stainless Steel

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Special Metals INCOLOY® 25-6HN Super-Austenitic Stainless Steel
Categories:	Metal; Ferrous Metal; Austenitic; Stainless Steel
Material Notes:	INCOLOY alloy 25-6HN is a super-austenitic stainless steel containing 6% molybdenum and with properties enhanced by its content of nitrogen. Its high content of nickel results in thermal stability and resistance to stress corrosion cracking. Designated as UNS N08367, as is alloy AL6XN®1. The same ASTM, ASME and NACE specifications cover the alloys. Alloy 25-6HN offers significantly improved strength and corrosion resistance in most environments over conventional austenitic stainless steels such as AISI 304 or 316L. Typical applications include welded tubes for heat exchangers for chemical processing and marine applications and for desalination systems, flue gas desulfurization equipment for coal-fired power plants, and reaction vessels for pharmaceutical production. Information Provided by Special Metals Corporation
Key Words:	UNS N08367; ASTM B 688, A240, B 691, B 564, B472, B 676, B 675, B 804, B 462, B 366 ASME SB688, SA240, SB691, SB564, SB472, SB676, SB675, SB804, SB462, SB366
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Physical Properties	Original Value	Comments

Density	8.02 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	90	Annealed Plate
Tensile Strength, Ultimate	80000 psi @Temperature 538 °C
	84000 psi @Temperature 427 °C
	86000 psi @Temperature 260 °C
	87000 psi @Temperature 316 °C
	89000 psi @Temperature 204 °C
	93000 psi @Temperature 149 °C
	107000 psi @Temperature 21.1 °C	Annealed Plate
Tensile Strength, Yield	40.0 ksi @Temperature 427 °C
	43.0 ksi @Temperature 538 °C
	43.0 ksi @Temperature 316 °C
	46.0 ksi @Temperature 204 °C
	46.0 ksi @Temperature 260 °C
	49.0 ksi @Temperature 149 °C
	55.0 ksi @Strain 2 %, Temperature 21.1 °C	Annealed Plate
Elongation at Break	45 % @Temperature 217 °C
	46 % @Temperature 316 °C
	47 % @Temperature 149 °C
	47 % @Temperature 204 °C
	47 % @Temperature 260 °C
	48 % @Temperature 20.0 °C	Annealed Plate
	48 % @Temperature 538 °C

Electrical Properties	Original Value	Comments
Magnetic Permeability	1.003 @Temperature 20.0 °C	200 Oersted

Thermal Properties	Original Value	Comments
CTE, linear	8.49 µin/in-°F @Temperature 100 °C
	15.59 µm/m-°C @Temperature 100 °C
	15.98 µm/m-°C @Temperature 300 °C
	16.45 µm/m-°C @Temperature 500 °C
	17.35 µm/m-°C @Temperature 700 °C
Melting Point	2470 - 2560 °F
Solidus	2470 °F
Liquidus	2560 °F

Component Elements Properties	Original Value	Comments
Carbon, C	0.010 %
Chromium, Cr	20.6 %
Copper, Cu	0.25 %
Iron, Fe	47 %	Balance
Manganese, Mn	0.40 %
Molybdenum, Mo	6.3 %
Nickel, Ni	24.3 %
Nitrogen, N	0.21 %
Phosphorus, P	0.020 %
Silicon, Si	0.30 %
Sulfur, S	0.0010 %

Descriptive Properties
Crevice Corrosion Temperature (°C)	35	per G48-D
	50	in Green Death; Duration is 24 hours
Critical Pitting Temperature (°C)	55	Filler Metal: INCONEL 625; Welded Sample
	60	Filler Metal: INCONEL 686; Welded Sample
	70	in Green Death; Duration is 72 hours
	75	per G48-C
Depth of Cut (in)	0.15	High Speed Steel Machining
	0.15	Carbide Machining
Feed (in/rev)	0.005	High Speed Steel Drilling
	0.018	High Speed Steel Machining
	0.018	Carbide Machining
Pitting Resistance Equivalent Number	48.3
Speed (SFPM)	25	High Speed Steel Machining
	25	High Speed Steel Drilling
	350	Carbide Machining

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NINDA13 / 98904

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