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

Category Metal , Ferrous Metal , Austenitic , Stainless Steel
Manufacturer Special Metals (includes the former Inco Alloys International Inc.)
Trade Name INCOLOY®
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Special Metals INCOLOY® 25-6HN Super-Austenitic Stainless Steel.pdf
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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, alloy 25-6HN directly competes with alloy AL6XN®. The same ASTM, ASME, and NACE specifications cover the alloys. Alloy 25-6HN is a new addition to special Metals existing line of high performance, super-austenitic stainless steels, INCOLOY alloys 25-6MO and 27-7MO.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
Physical Properties Metric English Comments
Density 8.02 g/cc
0.290 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell B 90
90
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
 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 2.00 %,
Temperature 21.1 °C
 55000 psi

@Strain 2.00 %,
Temperature 70.0 °F
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
 Plate
48 %

@Temperature 538 °C
 48 %

@Temperature 1000 °F
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 41.309 %
41.309 %
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 %
Phosphorous, P 0.020 %
0.020 %
Silicon, Si 0.30 %
0.30 %
Sulfur, S 0.0010 %
0.0010 %
Electrical Properties Metric English Comments
Magnetic Permeability 1.003

@Temperature 20.0 °C
 1.003

@Temperature 68.0 °F
 200 Oersteds
Descriptive Properties Value Comments
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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