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Special Metals INCOLOY® 27-7MO 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 Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Special Metals INCOLOY® 27-7MO Super-Austenitic Stainless Steel.pdf
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Material Notes:
INCOLOY® alloy 27-7MO (UNS S31277; EP 1,263,999 B1) is an advanced 7% molybdenum super-austenitic stainless steel offering corrosion resistance in most environments superior to 6% molybdenum super-austenitic stainless steels. In many environments, alloy 27-7MO offers resistance approaching that of much more highly alloyed materials such as INCONEL alloys 625, 22, and C-276.Applications for INCOLOY alloy 27-7MO are found in the pollution control, power, marine, chemical processing, pulp and paper, and oil and gas industries. The alloy offers a unique combination of corrosion resistance, high strength and ease of fabrication at an economical price. Alloy 27-7MO is available in standard product forms including plate, sheet, rod, bar, wire rod, pipe, tube, and forging stock.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 95
95
Hardness, Vickers 225
225
0% cold work
380
380
50% cold work
Tensile Strength, Ultimate 827 MPa
120000 psi
Tensile Strength, Yield 414 MPa

@Strain 0.200 %
 60000 psi

@Strain 0.200 %
Elongation at Break 50 %
50 %
Modulus of Elasticity 138 GPa

@Temperature 816 °C
 20000 ksi

@Temperature 1500 °F
153 GPa

@Temperature 649 °C
 22200 ksi

@Temperature 1200 °F
164 GPa

@Temperature 482 °C
 23800 ksi

@Temperature 900 °F
174 GPa

@Temperature 316 °C
 25200 ksi

@Temperature 601 °F
184 GPa

@Temperature 149 °C
 26700 ksi

@Temperature 300 °F
191 GPa

@Temperature 22.0 °C
 27700 ksi

@Temperature 71.6 °F
Poissons Ratio 0.29

@Temperature 22.0 °C
 0.29

@Temperature 71.6 °F
0.30

@Temperature 149 °C
 0.30

@Temperature 300 °F
0.30

@Temperature 316 °C
 0.30

@Temperature 601 °F
0.31

@Temperature 816 °C
 0.31

@Temperature 1500 °F
0.32

@Temperature 482 °C
 0.32

@Temperature 900 °F
0.33

@Temperature 649 °C
 0.33

@Temperature 1200 °F
Shear Modulus 53.0 GPa

@Temperature 816 °C
 7690 ksi

@Temperature 1500 °F
57.0 GPa

@Temperature 649 °C
 8270 ksi

@Temperature 1200 °F
62.0 GPa

@Temperature 482 °C
 8990 ksi

@Temperature 900 °F
67.0 GPa

@Temperature 316 °C
 9720 ksi

@Temperature 601 °F
71.0 GPa

@Temperature 149 °C
 10300 ksi

@Temperature 300 °F
74.0 GPa

@Temperature 22.0 °C
 10700 ksi

@Temperature 71.6 °F
Thermal Properties Metric English Comments
CTE, linear 12.21 µm/m-°C

@Temperature -190 °C
 6.783 µin/in-°F

@Temperature -310 °F
 Mill Annealed Condition
13.93 µm/m-°C

@Temperature -50.0 °C
 7.739 µin/in-°F

@Temperature -58.0 °F
 Mill Annealed Condition
15.46 µm/m-°C

@Temperature 200 °C
 8.589 µin/in-°F

@Temperature 392 °F
 Mill Annealed Condition
15.85 µm/m-°C

@Temperature 350 °C
 8.806 µin/in-°F

@Temperature 662 °F
 Mill Annealed Condition
16.19 µm/m-°C

@Temperature 500 °C
 8.994 µin/in-°F

@Temperature 932 °F
 Mill Annealed Condition
16.86 µm/m-°C

@Temperature 650 °C
 9.367 µin/in-°F

@Temperature 1200 °F
 Mill Annealed Condition
Specific Heat Capacity 0.454 J/g-°C
0.109 BTU/lb-°F
Thermal Conductivity 10.114 W/m-K

@Temperature 23.0 °C
 70.191 BTU-in/hr-ft²-°F

@Temperature 73.4 °F
12.126 W/m-K

@Temperature 100 °C
 84.154 BTU-in/hr-ft²-°F

@Temperature 212 °F
16.295 W/m-K

@Temperature 300 °C
 113.09 BTU-in/hr-ft²-°F

@Temperature 572 °F
20.039 W/m-K

@Temperature 500 °C
 139.07 BTU-in/hr-ft²-°F

@Temperature 932 °F
24.069 W/m-K

@Temperature 700 °C
 167.04 BTU-in/hr-ft²-°F

@Temperature 1290 °F
25.852 W/m-K

@Temperature 900 °C
 179.41 BTU-in/hr-ft²-°F

@Temperature 1650 °F
28.947 W/m-K

@Temperature 1100 °C
 200.89 BTU-in/hr-ft²-°F

@Temperature 2010 °F
Component Elements Properties Metric English Comments
Carbon, C <= 0.020 %
<= 0.020 %
Chromium, Cr 20.5 - 23 %
20.5 - 23 %
Copper, Cu 0.50 - 1.5 %
0.50 - 1.5 %
Iron, Fe 35.54 - 46.2 %
35.54 - 46.2 %
Balance
Manganese, Mn <= 3.0 %
<= 3.0 %
Molybdenum, Mo 6.5 - 8.0 %
6.5 - 8.0 %
Nickel, Ni 26 - 28 %
26 - 28 %
Nitrogen, N 0.30 - 0.40 %
0.30 - 0.40 %
Phosphorous, P <= 0.030 %
<= 0.030 %
Silicon, Si <= 0.50 %
<= 0.50 %
Sulfur, S <= 0.010 %
<= 0.010 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.000100 ohm-cm
0.000100 ohm-cm
Magnetic Permeability 1.004

@Temperature 23.0 °C
 1.004

@Temperature 73.4 °F
<= 1.01

@Temperature -30.0 °C
 <= 1.01

@Temperature -22.0 °F
 200 oersted (15.9 kA/m); Annealed
<= 1.01

@Temperature -30.0 °C
 <= 1.01

@Temperature -22.0 °F
 200 oersted (15.9 kA/m); 50% Cold Worked
Descriptive Properties Value Comments
Critical Crevice Temperature (°C) 45
ASTM G48 Test Methods C and D
60
in "Green Death" solution
Critical Pitting Temperature (°C) >85
ASTM G48 Test Methods C and D
75
in "Green Death" solution
Pitting Resistance Equivalent Number 43
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