Stainless Steel 321

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Stainless Steel 321

Stainless 321 is a heat resistant, titanium stabilized, austenitic alloy that’s commonly used for service in the 1000°-1600°F temperature range. 321 stainless is primarily used in applications that involve continuous and intermittent service temperatures within the carbide precipitation range of 800°-1500°F. Type 321 is similar to type 304 stainless but with a titanium addition of at least five times the carbon content. This titanium addition reduces or prevents carbide precipitation during welding and in the 800°-1500°F service conditions. In order to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking in service temperatures at 1500°-1650°F an air cool may be used. ss-321

Stainless 321 Chemical Composition, %

Cr Ni Mo Cu Ti C
MIN 17.0 9.0 - - 5x(C+N) -
MAX 19.0 12.0 0.75 0.75 0.70 0.08
�@
Mn Si P S N Fe
MIN - 0.25 - - - -
MAX 2.0 1.0 0.04 0.03 0.1 Bal

Mechanical Properties

Average Elevated Temperature Tensile Properties

Temperature, °F Ultimate Tensile Strength, ksi .2% Yield Strength, ksi
68 84 38
400 62 20.5
600 62 18
800 62 17
1000 59.5 16.5
1200 45.5 16
1400 27.5 14