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	Metric	English	Comments

Density	8.02 g/cc	0.290 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	90	90	Annealed Plate
Tensile Strength, Ultimate	552 MPa @Temperature 538 °C	80000 psi @Temperature 1000 °F
	579 MPa @Temperature 427 °C	84000 psi @Temperature 800 °F
	593 MPa @Temperature 260 °C	86000 psi @Temperature 500 °F
	600 MPa @Temperature 316 °C	87000 psi @Temperature 600 °F
	614 MPa @Temperature 204 °C	89000 psi @Temperature 400 °F
	641 MPa @Temperature 149 °C	93000 psi @Temperature 300 °F
	738 MPa @Temperature 21.1 °C	107000 psi @Temperature 70.0 °F	Annealed Plate
Tensile Strength, Yield	276 MPa @Temperature 427 °C	40000 psi @Temperature 800 °F
	296 MPa @Temperature 538 °C	43000 psi @Temperature 1000 °F
	296 MPa @Temperature 316 °C	43000 psi @Temperature 600 °F
	317 MPa @Temperature 204 °C	46000 psi @Temperature 400 °F
	317 MPa @Temperature 260 °C	46000 psi @Temperature 500 °F
	338 MPa @Temperature 149 °C	49000 psi @Temperature 300 °F
	379 MPa @Strain 2 %, Temperature 21.1 °C	55000 psi @Strain 2 %, Temperature 70.0 °F	Annealed Plate
Elongation at Break	45 % @Temperature 217 °C	45 % @Temperature 423 °F
	46 % @Temperature 316 °C	46 % @Temperature 601 °F
	47 % @Temperature 149 °C	47 % @Temperature 300 °F
	47 % @Temperature 204 °C	47 % @Temperature 399 °F
	47 % @Temperature 260 °C	47 % @Temperature 500 °F
	48 % @Temperature 20.0 °C	48 % @Temperature 68.0 °F	Annealed Plate
	48 % @Temperature 538 °C	48 % @Temperature 1000 °F

Electrical Properties	Metric	English	Comments
Magnetic Permeability	1.003 @Temperature 20.0 °C	1.003 @Temperature 68.0 °F	200 Oersted

Thermal Properties	Metric	English	Comments
CTE, linear	15.3 µm/m-°C @Temperature 100 °C	8.49 µin/in-°F @Temperature 212 °F
	15.59 µm/m-°C @Temperature 100 °C	8.661 µin/in-°F @Temperature 212 °F
	15.98 µm/m-°C @Temperature 300 °C	8.878 µin/in-°F @Temperature 572 °F
	16.45 µm/m-°C @Temperature 500 °C	9.139 µin/in-°F @Temperature 932 °F
	17.35 µm/m-°C @Temperature 700 °C	9.639 µin/in-°F @Temperature 1290 °F
Melting Point	1350 - 1400 °C	2470 - 2560 °F
Solidus	1350 °C	2470 °F
Liquidus	1400 °C	2560 °F

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

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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NINDA13 / 98904

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