661 Stainless Steel

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661 Stainless Steel
Categories:	Metal; Ferrous Metal; Heat Resisting; Stainless Steel; T 600 Series Stainless Steel
Material Notes:	16 mm diameter bar, heated to 1190°C for 1 hour, air cooled, heated to 730°C for 16 hours, air cooled.
Key Words:	UNS R30155, AMS 5376, AMS 5531, AMS 5532, AMS 5585, AMS 5768, AMS 5769, AMS 5794, AMS 5795, ANSI G81.40, ASTM A639, ASTM A567, DIN 1.4971
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Physical Properties	Metric	English	Comments

Density	8.25 g/cc	0.298 lb/in³

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	824 MPa	120000 psi
	248 MPa @Temperature 870 °C	36000 psi @Temperature 1600 °F
	403 MPa @Temperature 760 °C	58500 psi @Temperature 1400 °F
	562 MPa @Temperature 650 °C	81500 psi @Temperature 1200 °F
	621 MPa @Temperature 540 °C	90100 psi @Temperature 1000 °F
	883 MPa @Temperature -18.0 °C	128000 psi @Temperature -0.400 °F
	969 MPa @Temperature -73.0 °C	141000 psi @Temperature -99.4 °F
	1069 MPa @Temperature -130 °C	155000 psi @Temperature -202 °F
	1131 MPa @Temperature -185 °C	164000 psi @Temperature -301 °F
Tensile Strength, Yield	362 MPa @Strain 0.2 %	52500 psi @Strain 0.2 %
	186 MPa @Strain 0.2 %, Temperature 760 °C	27000 psi @Strain 0.2 %, Temperature 1400 °F
	193 MPa @Strain 0.2 %, Temperature 870 °C	28000 psi @Strain 0.2 %, Temperature 1600 °F
	217 MPa @Strain 0.2 %, Temperature 540 °C	31500 psi @Strain 0.2 %, Temperature 1000 °F
	217 MPa @Strain 0.2 %, Temperature 650 °C	31500 psi @Strain 0.2 %, Temperature 1200 °F
	224 MPa @Strain 0.2 %, Temperature 870 °C	32500 psi @Strain 0.2 %, Temperature 1600 °F
	238 MPa @Strain 0.2 %, Temperature 760 °C	34500 psi @Strain 0.2 %, Temperature 1400 °F
	248 MPa @Strain 0.2 %, Temperature 650 °C	36000 psi @Strain 0.2 %, Temperature 1200 °F
	265 MPa @Strain 0.2 %, Temperature 540 °C	38400 psi @Strain 0.2 %, Temperature 1000 °F
	393 MPa @Strain 0.2 %, Temperature -18.0 °C	57000 psi @Strain 0.2 %, Temperature -0.400 °F
	483 MPa @Strain 0.2 %, Temperature -73.0 °C	70100 psi @Strain 0.2 %, Temperature -99.4 °F
	565 MPa @Strain 0.2 %, Temperature -130 °C	81900 psi @Strain 0.2 %, Temperature -202 °F
	710 MPa @Strain 0.2 %, Temperature -185 °C	103000 psi @Strain 0.2 %, Temperature -301 °F
Elongation at Break	43 %	43 %	in 50 mm
	22 % @Temperature -185 °C	22 % @Temperature -301 °F	in 50 mm
	29 % @Temperature -130 °C	29 % @Temperature -202 °F	in 50 mm
	36 % @Temperature -73.0 °C	36 % @Temperature -99.4 °F	in 50 mm
	36 % @Temperature 760 °C	36 % @Temperature 1400 °F	in 50 mm
	42 % @Temperature -18.0 °C	42 % @Temperature -0.400 °F	in 50 mm
	44 % @Temperature 650 °C	44 % @Temperature 1200 °F	in 50 mm
	44 % @Temperature 870 °C	44 % @Temperature 1600 °F	in 50 mm
	47 % @Temperature 540 °C	47 % @Temperature 1000 °F	in 50 mm
Reduction of Area	40 %	40 %
	20 % @Temperature -185 °C	20 % @Temperature -301 °F
	25 % @Temperature -130 °C	25 % @Temperature -202 °F
	29 % @Temperature -73.0 °C	29 % @Temperature -99.4 °F
	36 % @Temperature 760 °C	36 % @Temperature 1400 °F
	42 % @Temperature 870 °C	42 % @Temperature 1600 °F
	45 % @Temperature -18.0 °C	45 % @Temperature -0.400 °F
	46 % @Temperature 650 °C	46 % @Temperature 1200 °F
	48.5 % @Temperature 540 °C	48.5 % @Temperature 1000 °F
Modulus of Elasticity	200 GPa	29000 ksi	Typical for stainless steel
Machinability	18 %	18 %	Based on 100% machinability for AISI 1212 steel.
Charpy Impact	81.0 J	59.7 ft-lb	V-Notch
	22.0 J @Temperature -185 °C	16.2 ft-lb @Temperature -301 °F	V-Notch
	43.0 J @Temperature -130 °C	31.7 ft-lb @Temperature -202 °F	V-Notch
	54.0 J @Temperature -73.0 °C	39.8 ft-lb @Temperature -99.4 °F	V-Notch
	68.0 J @Temperature -18.0 °C	50.2 ft-lb @Temperature -0.400 °F	V-Notch
	87.0 J @Temperature 760 °C	64.2 ft-lb @Temperature 1400 °F	V-Notch
	87.0 J @Temperature 870 °C	64.2 ft-lb @Temperature 1600 °F	V-Notch
	89.0 J @Temperature 650 °C	65.6 ft-lb @Temperature 1200 °F	V-Notch
	108 J @Temperature 540 °C	79.7 ft-lb @Temperature 1000 °F	V-Notch

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000942 ohm-cm @Temperature 25.0 °C	0.0000942 ohm-cm @Temperature 77.0 °F
	0.000100 ohm-cm @Temperature 200 °C	0.000100 ohm-cm @Temperature 392 °F
	0.000110 ohm-cm @Temperature 400 °C	0.000110 ohm-cm @Temperature 752 °F
	0.000120 ohm-cm @Temperature 600 °C	0.000120 ohm-cm @Temperature 1110 °F
	0.000120 ohm-cm @Temperature 800 °C	0.000120 ohm-cm @Temperature 1470 °F
	0.000120 ohm-cm @Temperature 1000 °C	0.000120 ohm-cm @Temperature 1830 °F

Thermal Properties	Metric	English	Comments
CTE, linear	14.0 µm/m-°C @Temperature 21.0 - 95.0 °C	7.78 µin/in-°F @Temperature 69.8 - 203 °F
	15.3 µm/m-°C @Temperature 21.0 - 205 °C	8.50 µin/in-°F @Temperature 69.8 - 401 °F
	15.3 µm/m-°C @Temperature 21.0 - 315 °C	8.50 µin/in-°F @Temperature 69.8 - 599 °F
	16.4 µm/m-°C @Temperature 21.0 - 540 °C	9.11 µin/in-°F @Temperature 69.8 - 1000 °F
	17.1 µm/m-°C @Temperature 21.0 - 650 °C	9.50 µin/in-°F @Temperature 69.8 - 1200 °F
	17.5 µm/m-°C @Temperature 21.0 - 760 °C	9.72 µin/in-°F @Temperature 69.8 - 1400 °F
	17.8 µm/m-°C @Temperature 21.0 - 870 °C	9.89 µin/in-°F @Temperature 69.8 - 1600 °F
	18.2 µm/m-°C @Temperature 21.0 - 980 °C	10.1 µin/in-°F @Temperature 69.8 - 1800 °F
Specific Heat Capacity	0.435 J/g-°C @Temperature 21.0 - 100 °C	0.104 BTU/lb-°F @Temperature 69.8 - 212 °F
Thermal Conductivity	12.3 W/m-K @Temperature 21.0 °C	85.4 BTU-in/hr-ft²-°F @Temperature 69.8 °F
	13.1 W/m-K @Temperature 95.0 °C	90.9 BTU-in/hr-ft²-°F @Temperature 203 °F
	14.5 W/m-K @Temperature 205 °C	101 BTU-in/hr-ft²-°F @Temperature 401 °F
	16.1 W/m-K @Temperature 315 °C	112 BTU-in/hr-ft²-°F @Temperature 599 °F
	17.6 W/m-K @Temperature 425 °C	122 BTU-in/hr-ft²-°F @Temperature 797 °F
	19.2 W/m-K @Temperature 540 °C	133 BTU-in/hr-ft²-°F @Temperature 1000 °F
	20.8 W/m-K @Temperature 650 °C	144 BTU-in/hr-ft²-°F @Temperature 1200 °F
Melting Point	1300 - 1355 °C	2370 - 2471 °F
Solidus	1300 °C	2370 °F
Liquidus	1355 °C	2471 °F
Maximum Service Temperature, Air	1040 °C	1900 °F	Continuous or Intermittent Service

Component Elements Properties	Metric	English	Comments
Carbon, C	0.080 - 0.16 %	0.080 - 0.16 %
Chromium, Cr	20 - 22.5 %	20 - 22.5 %
Cobalt, Co	18.5 - 21 %	18.5 - 21 %
Iron, Fe	31 %	31 %
Manganese, Mn	1.0 - 2.0 %	1.0 - 2.0 %
Molybdenum, Mo	2.5 - 3.5 %	2.5 - 3.5 %
Nb + Ta	0.75 - 1.25 %	0.75 - 1.25 %
Nickel, Ni	19 - 21 %	19 - 21 %
Niobium, Nb (Columbium, Cb)	0.50 %	0.50 %
Nitrogen, N	<= 0.20 %	<= 0.20 %
Phosphorus, P	<= 0.040 %	<= 0.040 %
Silicon, Si	<= 1.0 %	<= 1.0 %
Sulfur, S	<= 0.030 %	<= 0.030 %
Tantalum, Ta	0.50 %	0.50 %
Tungsten, W	2.0 - 3.0 %	2.0 - 3.0 %

References for this datasheet.

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MQ661A / 13279

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