Stainless Steel 321

UNS S32100
ASTM A 240, A 479, A 276

321 Stainless is available in the following forms:
Sheet
Plate
Bar
Pipe & Tube
Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
Weld Wire

321 Stainless Steel Overview
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.

What are the characteristics of 321 Stainless?
Oxidation resistant to 1600 F
Stabilized against weld heat affected zone (HAZ) intergranular corrosion
Resists polythionic acid stress corrosion cracking

What applications might 321 Stainless Steel be used?
Aircraft piston engine manifolds and exhaust stacks
Expansion joints
Thermal oxidizers
Refinery equipment
High temperature chemical process equipment

Stainless 321 Chemical Composition, %