AISI Type S21904 (Alloy 21-6-9) Stainless Steel, 30% final cold reduction, stress relieved 540°C (1000°F) for 2 hours, air cooled

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AISI Type S21904 (Alloy 21-6-9) Stainless Steel, 30% final cold reduction, stress relieved 540°C (1000°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 Properties	Original Value	Comments

Density	7.83 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	360	Converted from Rockwell C hardness.
Hardness, Knoop	392	Converted from Rockwell C hardness.
Hardness, Rockwell C	39
Hardness, Vickers	378	Converted from Rockwell C hardness.
Tensile Strength, Ultimate	1235 MPa
Tensile Strength, Yield	1115 MPa @Strain 0.2 %
Elongation at Break	28 %	in 50 mm
Modulus of Elasticity	200 GPa	Typical for stainless steel
Machinability	30 %	Based on 100% machinability for AISI 1212 steel.

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000730 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	16.7 µm/m-°C @Temperature 25.0 - 95.0 °C
	17.3 µm/m-°C @Temperature 25.0 - 205 °C	Annealed
	18.2 µm/m-°C @Temperature 25.0 - 315 °C	Annealed
	19.1 µm/m-°C @Temperature 25.0 - 540 °C
	20.0 µm/m-°C @Temperature 25.0 - 760 °C	Annealed
	20.0 µm/m-°C @Temperature 25.0 - 870 °C	Annealed
	20.5 µm/m-°C @Temperature 25.0 - 980 °C	Annealed
Specific Heat Capacity	0.480 J/g-°C	Typical value for stainless steel.
Thermal Conductivity	7.80 W/m-K @Temperature -180 °C
	10.9 W/m-K @Temperature -73.0 °C
	13.8 W/m-K @Temperature 95.0 °C
	16.1 W/m-K @Temperature 205 °C
	18.2 W/m-K @Temperature 315 °C
	20.2 W/m-K @Temperature 425 °C
	22.5 W/m-K @Temperature 540 °C
	24.7 W/m-K @Temperature 650 °C
	26.8 W/m-K @Temperature 760 °C
	28.9 W/m-K @Temperature 870 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.040 %
Chromium, Cr	20 %
Iron, Fe	64 %
Manganese, Mn	9.0 %
Nickel, Ni	6.0 %
Nitrogen, N	0.23 %
Phosphorus, P	<= 0.060 %
Silicon, Si	<= 1.0 %
Sulfur, S	<= 0.030 %

References for this datasheet.

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