UNS Number S32100

Stainless Steel 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.

Available Forms of Stainless Steel 321 at Rooplaxmi Steels:

•           Sheet
•           Plate
•           Bar
•           Pipe & Tube (welded & seamless)
•           Fittings

Characteristics of Stainless Steel 321:

•           Oxidation resistant to 1600°F
•           Stabilized against weld heat affected zone (HAZ) intergranular corrosion
•           Resists polythionic acid stress corrosion cracking

Stainless Steel 321 Chemical Composition, %:

Cr	Ni	Mo	Cu	Ti	C	Mn	Si
17.0-19.0	9.0-12.0	0.75 max	0.75 max	5x(C+N) – 0.70	0.08 max	2.0 max	0.25-1.0

                   

P	S	N	Fe
0.04 max	0.03 max	0.1	Balance

 

Application of Stainless Steel 321:

•           Aircraft piston engine manifolds and exhaust stacks
•           Expansion joints
•           Thermal oxidizers
•           Refinery equipment
•           High temperature chemical process equipment

Mechanical Properties of Stainless Steel 321:
Typical Mechanical Properties

Tensile Strength	515 Mpa min
Yield	(0.2 % offset) 205 Mpa min
Elongation	40 %