Type 321 (UNS S32100) Stainless Steel

Type 321 (UNS S32100) Stainless Steel

Type 321 (UNS S32100) Stainless Steel Description Type 321 is a titanium stabilized chromium nickel austenitic stainless steel with corrosion resistance similar to 304/304L. This grade is typically used in the 800-1500˚F temperature range where it is stabilized against chromium carbide...
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Type 321 (UNS S32100) Stainless Steel

Description

Type 321 is a titanium stabilized chromium nickel austenitic stainless steel with corrosion resistance similar to 304/304L. This grade is typically used in the 800-1500˚F temperature range where it is stabilized against chromium carbide precipitation by the addition of titanium, which results in the precipitation of titanium carbides. 


Type 321 has excellent intergranular corrosion resistance after exposure to this temperature range, and this grade resists oxidation up to 1500˚F and has higher creep and stress rupture properties than 304/304L. It also possesses good low temperature toughness and is non-magnetic in the annealed condition.


Chemical Composition
Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*.

Element

321

Carbon

0.08

Chromium

17.0-19.0

Nickel

9.0-12.0

Manganese

2.00

Silicon

0.75

Nitrogen

0.10

Phosphorus

0.045

Sulfur

0.030

Titanium

5(C+N) min / 0.70 max

* Maximum, unless range is indicated


Mechanical Properties
Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240.

Property

321

Yield Strength, min. (ksi)

30

Tensile Strength, min. (ksi)

75

Elongation, min. (%)

40

Hardness, max. (Rb)

95


Physical Properties
Physical properties for Type 321 stainless steel

Property

321 Data

Density, lb/in3

0.286

Modulus of Elasticity, psi

28.0 x 106

Coefficient of Thermal Expansion, 68-212˚F, /˚F

9.2 x 10-6

Thermal Conductivity, Btu/ft hr ˚F

9.3

Specific Heat, Btu/lb ˚F

0.12

Electrical Resistivity, Microohm-in

28.4


Standards
Typical standards for Type 321 stainless steel

Property

321 Data

Density, lb/in3

0.286

Modulus of Elasticity, psi

28.0 x 106

Coefficient of Thermal Expansion, 68-212˚F, /˚F

9.2 x 10-6

Thermal Conductivity, Btu/ft hr ˚F

9.3

Specific Heat, Btu/lb ˚F

0.12

Electrical Resistivity, Microohm-in

28.4


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