AK Steel 321 Austenitic Stainless steel

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AK Steel 321 Austenitic Stainless steel
Categories:	Metal; Ferrous Metal; Austenitic; Stainless Steel; T 300 Series Stainless Steel
Material Notes:	AK Steel 321 is a stabilized austenitic stainless steel similar to Type 304 but with a titanium addition. This titanium addition reduces or prevents carbide precipitation during welding and in 427 - 816°C service. It also improves the elevated temperature properties of the alloy. AK Steel 321 provides excellent resistance to oxidation and corrosion and possesses good creep strength. It is used primarily in applications involving continuous and intermittent service temperatures within the carbide precipitation range of 427 - 816°C. Information provided by AK Steel
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Physical Properties	Original Value	Comments

Density	9.01 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	80
Tensile Strength, Ultimate	621 MPa
Tensile Strength, Yield	276 MPa @Strain 0.2 %
Elongation at Break	45 %	in 2 inches
Tensile Modulus	193 GPa
Poissons Ratio	0.24	Calculated
Shear Modulus	78.0 GPa	torsion

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000720 ohm-cm
Magnetic Permeability	<= 1.02	H = 200 Oersted, Annealed

Thermal Properties	Original Value	Comments
CTE, linear	16.6 µm/m-°C @Temperature 0.000 - 100 °C
	20.2 µm/m-°C @Temperature <=871 °C
Specific Heat Capacity	0.500 J/g-°C @Temperature 0.000 - 100 °C
Thermal Conductivity	16.0 W/m-K @Temperature 100 °C
	22.0 W/m-K @Temperature 500 °C
Melting Point	1371 - 1399 °C
Solidus	1371 °C
Liquidus	1399 °C
Maximum Service Temperature, Air	816 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.080 %
Chromium, Cr	17 - 19 %
Iron, Fe	65.295 - 74 %	As Remainder
Manganese, Mn	<= 2.0 %
Nickel, Ni	9.0 - 12 %
Nitrogen, N	<= 0.10 %
Phosphorus, P	<= 0.045 %
Silicon, Si	<= 0.75 %
Sulfur, S	<= 0.030 %
Titanium, Ti	<= 0.70 %

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NAKS114 / 14717

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