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Stainless Steel 321
Stainless Steel 321
Stainless Steel 321
Stainless Steel 321

Stainless Steel 321,321H

Alloy 321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance. 321H (UNS S 32109) is the higher carbon (0.04 – 0.10) version of 321 stainless steel.
Product Introduction

Alloy 321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture properties than alloys 304 and 304L. It also possesses good low temperature toughness.


Alloy 321H (UNS S 32109) is the higher carbon (0.04 – 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the plate enables dual certification.


Alloy 321 cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.


Common Applications

  • Aerospace – piston engine manifolds

  • Chemical Processing

  • Expansion Joints

  • Food Processing – equipment and storage

  • Petroleum Refining – polythionic acid service

  • Waste Treatment – thermal oxidizers

Technical Data

Chemical Properties:

%

Cr

Ni

C

Si

Mn

P

S

N

Ti

Fe

321

min:17.0
max:19.0

min: 9.0
max:12.0

max:0.08

max:0.75

max:2.0

max:0.045

max:0.03

max:0.10

min:5*(C+N)
max:0.70

Balance

321H

min:17.0
max:19.0

min: 9.0
max:12.0

min:0.04
max:0.10

min:18.0
max:20.0

max:2.0

max:0.045

max:0.03

max:0.10

min:5*(C+N)
max:0.70

Balance

 

Mechanical Properties:

Grade

Tensile Strength
ksi (min.)

Yield Strength 0.2%
Offset ksi (min.)

Elongation -
% in
50 mm (min.)

Hardness
(Brinell) MAX

321

75

30

40

217

 

Physical Properties:

Denstiy
lbm/in3

Coefficient of

Thermal Expansion (min/in)-°F

Thermal Conductivity BTU/hr-ft-°F

Specific Heat BTU/lbm -°F

Modules of Elasticity (annealed)2-psi

at 68 °F

at 68 – 212°F

at 68 – 1832°F

at 200°F

at 32 – 212°F

in tension (E)

0.286

9.2

20.5

9.3

0.12

28 x 106

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