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Rulon Bearings

Special Metals INCOLOY® 27-7MO Super-Austenitic Stainless Steel
Categories: Metal; Ferrous Metal; Austenitic; Stainless Steel
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.

Information Provided by Special Metals Corporation
Key Words: UNS S31277; ASTM A 182, A 213, A 240, A 249, A 312, A 479
ASME SA 182, SA 213, SA 240 SA 249, SA 312, SA 479; ASME Code Case 2458
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Physical PropertiesMetricEnglishComments
Density 8.02 g/cc0.290 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell B 9595Annealed
Hardness, Vickers 2252250% cold work
 38038050% cold work
Tensile Strength, Ultimate 827 MPa120000 psiAnnealed
Tensile Strength, Yield 414 MPa
@Strain 0.2 %		60000 psi
@Strain 0.2 %		Annealed
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
Shear Strength 74.5 MPa10800 psiAnnealed
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.000100 ohm-cm0.000100 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
 
Thermal PropertiesMetricEnglishComments
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-°C0.109 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
Melting Point 1350 - 1390 °C2460 - 2530 °F
Solidus 1350 °C2460 °F
Liquidus 1390 °C2530 °F
 
Component Elements PropertiesMetricEnglishComments
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 %
Phosphorus, P <= 0.030 %<= 0.030 %
Silicon, Si <= 0.50 %<= 0.50 %
Sulfur, S <= 0.010 %<= 0.010 %
 
Descriptive Properties
Critical Crevice Temperature (°C)45ASTM G48 Test Methods C and D
 60in "Green Death" solution
Critical Pitting Temperature (°C)>85ASTM G48 Test Methods C and D
 75in "Green Death" solution
Pitting Resistance Equivalent Number43

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