General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Alloy 321 (UNS S32100) is titanium stabilized austenitic stainless steel plate 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) stainless steel plate 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 stainless steel plate cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.
Standard Inventory Specifications
- UNS S32100
- UNS S32109
- AMS 5510
- AMS 5645
- ASTM A 167
- ASTM A 240
- ASTM A 276
- ASTM A 479
- ASME SA 167
- ASME SA 240
Common Trade Names
- ATI 321 (™ Allegheny Technologies)
Common Applications of 321
- Aircraft exhaust stacks
- Manifolds
- Chemical processing equipment
- Welded equipment
- Jet engine parts
Chemical Composition
321 Chemical Composition
Element
Percent by Weight
C
Carbon
8.00%
Mn
Manganese
200.00%
P
Phosphorous
4.50%
S
Sulfur
0.03
Si
Silicon
75.00%
Cr
Chromium
17.00-19.00
Ni
Nickel
9.00-12.00
Ti
5x(C+N) min to 0.70 max
4.0%
N
Nitrogen
0.1
Fe
Iron
Balance
Physical Properties
321 Physical Properties
Physical property | Value |
Density | 0.28 lb/in3 |
Melting Range | 2550 – 2635 °F |
Specific Heat Capacity at 70°F | 0.12 Btu/lb/°F |
Thermal Conductivity at 212°F | 9.3 Btu/hr-ft-°F |
Poisson’s Ratio | |
Elastic Modulus | 28.0 x 106psi |
Mechanical Properties
Mechanical Properties and Yield Strength of 321
Property | Type 321 | Type 347 | |
Yield Strength, 0.2% Offset psi MPa | 30,000 205 | 30,000 205 | |
Ultimate Tensile Strength, psi MPa | 75,000 515 | 75,000 515 | |
Percent Elongation in 2 in. or 51 mm | 40.0 | 40.0 | |
Hardness, Max., Brinell (Plate) RB (Sheet & Strip) | 217 95 | 201 92 |

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