Special Metals INCOLOY® 27-7MO Super-Austenitic Stainless Steel

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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 Properties	Original Value	Comments

Density	8.02 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	95	Annealed
Hardness, Vickers	225	0% cold work
	380	50% cold work
Tensile Strength, Ultimate	120000 psi	Annealed
Tensile Strength, Yield	414 MPa @Strain 0.2 %	Annealed
Elongation at Break	50 %
Modulus of Elasticity	138 GPa @Temperature 816 °C
	153 GPa @Temperature 649 °C
	164 GPa @Temperature 482 °C
	174 GPa @Temperature 316 °C
	184 GPa @Temperature 149 °C
	191 GPa @Temperature 22.0 °C
Poissons Ratio	0.29 @Temperature 22.0 °C
	0.30 @Temperature 149 °C
	0.30 @Temperature 316 °C
	0.31 @Temperature 816 °C
	0.32 @Temperature 482 °C
	0.33 @Temperature 649 °C
Shear Modulus	53.0 GPa @Temperature 816 °C
	57.0 GPa @Temperature 649 °C
	62.0 GPa @Temperature 482 °C
	67.0 GPa @Temperature 316 °C
	71.0 GPa @Temperature 149 °C
	74.0 GPa @Temperature 22.0 °C
Shear Strength	10.8 ksi	Annealed

Electrical Properties	Original Value	Comments
Electrical Resistivity	604 ohm-cir-mil/ft
Magnetic Permeability	1.004 @Temperature 23.0 °C
	<= 1.01 @Temperature -30.0 °C	200 Oersted (15.9 kA/m); Annealed
	<= 1.01 @Temperature -30.0 °C	200 Oersted (15.9 kA/m); 50% Cold Worked

Thermal Properties	Original Value	Comments
CTE, linear	12.21 µm/m-°C @Temperature -190 °C	Mill Annealed Condition
	13.93 µm/m-°C @Temperature -50.0 °C	Mill Annealed Condition
	15.46 µm/m-°C @Temperature 200 °C	Mill Annealed Condition
	15.85 µm/m-°C @Temperature 350 °C	Mill Annealed Condition
	16.19 µm/m-°C @Temperature 500 °C	Mill Annealed Condition
	16.86 µm/m-°C @Temperature 650 °C	Mill Annealed Condition
Specific Heat Capacity	0.454 J/g-°C
Thermal Conductivity	10.114 W/m-K @Temperature 23.0 °C
	12.126 W/m-K @Temperature 100 °C
	16.295 W/m-K @Temperature 300 °C
	20.039 W/m-K @Temperature 500 °C
	24.069 W/m-K @Temperature 700 °C
	25.852 W/m-K @Temperature 900 °C
	28.947 W/m-K @Temperature 1100 °C
Melting Point	1350 - 1390 °C
Solidus	1350 °C
Liquidus	1390 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.020 %
Chromium, Cr	20.5 - 23 %
Copper, Cu	0.50 - 1.5 %
Iron, Fe	35.54 - 46.2 %	Balance
Manganese, Mn	<= 3.0 %
Molybdenum, Mo	6.5 - 8.0 %
Nickel, Ni	26 - 28 %
Nitrogen, N	0.30 - 0.40 %
Phosphorus, P	<= 0.030 %
Silicon, Si	<= 0.50 %
Sulfur, S	<= 0.010 %

Descriptive Properties
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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