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Stainless Steel 321

  • UNS S32100
  • ASTM A 240, A 479, A 276

321 Stainless is available in the following forms at Mega Mex

  • 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

  • Oxidation resistant to 1600°F
  • Stabilized against weld heat affected zone (HAZ) intergranular corrosion
  • Resists polythionic acid stress corrosion cracking
Stainless Steel 321

Stainless 321 Chemical Composition, %

Cr

Ni

Mo

Cu

Ti

C

Mn

Si

P

S

N

Fe

MIN

17.0

9.0

-

-

5x(C+N)

-

-

0.25

-

-

-

-

MAX

19.0

12.0

0.75

0.75

0.70

0.08

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.