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Elmet Technologies

AISI Type S21904 (Alloy 21-6-9) Stainless Steel, 15% final cold reduction, stress relieved 705°C (1300°F) for 2 hours, air cooled
Categories: Metal; Ferrous Metal; Heat Resisting; Stainless Steel; T S20000 Series Stainless Steel
Material Notes: Austenitic, high strength, excellent corrosion resistance, and low magnetic permeability. Applications include aircraft applications such as ducting and bellows systems, tail pipes and exhaust systems, clamps, fasteners, flanges, and hydraulic tubing.
Key Words: UNS S21904, AMS 5595, AMS 5656, ASME SA412, ASTM A269 (XM-11), ASTM A276 (XM-11), ASTM A314 (XM-11), ASTM A412 (XM-11), ASTM A473 (XM-11), ASTM A580 (XM-11)
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Physical PropertiesMetricEnglishComments
Density 7.83 g/cc0.283 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 237237Converted from Rockwell C hardness.
Hardness, Knoop 250250Converted from Rockwell C hardness.
Hardness, Rockwell C 2020
Hardness, Vickers 242242Converted from Rockwell C hardness.
Tensile Strength, Ultimate 841 MPa122000 psi
Tensile Strength, Yield 640 MPa
@Strain 0.2 %		92800 psi
@Strain 0.2 %
Elongation at Break 60 %60 %in 50 mm
Modulus of Elasticity 200 GPa29000 ksiTypical for stainless steel
Machinability 30 %30 %Based on 100% machinability for AISI 1212 steel.
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000730 ohm-cm0.0000730 ohm-cm
 
Thermal PropertiesMetricEnglishComments
CTE, linear  16.7 µm/m-°C
@Temperature 25.0 - 95.0 °C		9.28 µin/in-°F
@Temperature 77.0 - 203 °F
 17.3 µm/m-°C
@Temperature 25.0 - 205 °C		9.61 µin/in-°F
@Temperature 77.0 - 401 °F		Annealed
 18.2 µm/m-°C
@Temperature 25.0 - 315 °C		10.1 µin/in-°F
@Temperature 77.0 - 599 °F		Annealed
 19.1 µm/m-°C
@Temperature 25.0 - 540 °C		10.6 µin/in-°F
@Temperature 77.0 - 1000 °F
 20.0 µm/m-°C
@Temperature 25.0 - 760 °C		11.1 µin/in-°F
@Temperature 77.0 - 1400 °F		Annealed
 20.0 µm/m-°C
@Temperature 25.0 - 870 °C		11.1 µin/in-°F
@Temperature 77.0 - 1600 °F		Annealed
 20.5 µm/m-°C
@Temperature 25.0 - 980 °C		11.4 µin/in-°F
@Temperature 77.0 - 1800 °F		Annealed
Specific Heat Capacity 0.480 J/g-°C0.115 BTU/lb-°FTypical value for stainless steel.
Thermal Conductivity  7.80 W/m-K
@Temperature -180 °C		54.1 BTU-in/hr-ft²-°F
@Temperature -292 °F
 10.9 W/m-K
@Temperature -73.0 °C		75.6 BTU-in/hr-ft²-°F
@Temperature -99.4 °F
 13.8 W/m-K
@Temperature 95.0 °C		95.8 BTU-in/hr-ft²-°F
@Temperature 203 °F
 16.1 W/m-K
@Temperature 205 °C		112 BTU-in/hr-ft²-°F
@Temperature 401 °F
 18.2 W/m-K
@Temperature 315 °C		126 BTU-in/hr-ft²-°F
@Temperature 599 °F
 20.2 W/m-K
@Temperature 425 °C		140 BTU-in/hr-ft²-°F
@Temperature 797 °F
 22.5 W/m-K
@Temperature 540 °C		156 BTU-in/hr-ft²-°F
@Temperature 1000 °F
 24.7 W/m-K
@Temperature 650 °C		171 BTU-in/hr-ft²-°F
@Temperature 1200 °F
 26.8 W/m-K
@Temperature 760 °C		186 BTU-in/hr-ft²-°F
@Temperature 1400 °F
 28.9 W/m-K
@Temperature 870 °C		201 BTU-in/hr-ft²-°F
@Temperature 1600 °F
 
Component Elements PropertiesMetricEnglishComments
Carbon, C <= 0.040 %<= 0.040 %
Chromium, Cr 20 %20 %
Iron, Fe 64 %64 %
Manganese, Mn 9.0 %9.0 %
Nickel, Ni 6.0 %6.0 %
Nitrogen, N 0.23 %0.23 %
Phosphorus, P <= 0.060 %<= 0.060 %
Silicon, Si <= 1.0 %<= 1.0 %
Sulfur, S <= 0.030 %<= 0.030 %

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

MQM22DD / 13702

Ensinger PEI




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