ATI Allegheny Ludlum Stainless Steel Type 321 (UNS S32100)

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ATI Allegheny Ludlum Stainless Steel Type 321 (UNS S32100)
Categories:	Metal; Ferrous Metal; Stainless Steel; T 300 Series Stainless Steel
Material Notes:	AL 321 is a stabilized stainless steel which offers excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800° to 1500°C. The addition of titanium stabilizes against chromium carbide formation. Tensile and hardness data below per ASTM A 240 and ASME SA-240 Information provided by Allegheny Ludlum Corporation.
Key Words:	Specs for plate sheet & strip: ASTM A 240, ASTM A 240 M; ASME SA-240, ASME SA-240M; AMS 5510
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Physical Properties	Original Value	Comments

Density	7.92 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	<= 217	plate
Hardness, Rockwell B	<= 95	sheet or strip
Tensile Strength, Ultimate	>= 515 MPa
Tensile Strength, Yield	>= 205 MPa @Strain 0.2 %
Elongation at Break	>= 40 %	in 2" (50 mm)
Tensile Modulus	193 GPa
Fatigue Strength	180 MPa	endurance limit; test conditions not reported

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000720 ohm-cm
Magnetic Permeability	<= 1.02	typically < 1.02 at 200H; increases with cold work.

Thermal Properties	Original Value	Comments
CTE, linear	16.6 µm/m-°C @Temperature 20.0 - 100 °C
	18.9 µm/m-°C @Temperature 20.0 - 600 °C
	20.5 µm/m-°C @Temperature 20.0 - 1000 °C
Specific Heat Capacity	0.500 J/g-°C
Thermal Conductivity	16.3 W/m-K @Temperature 20.0 - 100 °C
Melting Point	1398 - 1446 °C
Solidus	1398 °C
Liquidus	1446 °C
Maximum Service Temperature, Air	816 °C	good for prolonged service

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.080 %
Chromium, Cr	17 - 19 %
Iron, Fe	70 %	as balance
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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