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STAINLESS STEEL 321Download

 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
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

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
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

Welding Stainless Steel 321
321 Stainless is readily welded by all common methods including submerged arc. Appropriate weld fillers are most often specified as AWS E/ER 347 or E/ER 321.
This alloy is generally considered to have comparable weldability to 304 and 304L stainless with the main difference being the titanium addition which reduces or prevents carbide precipitation during welding.