321 Stainless Steel Sheet, Coil, Plate & Bar - AMS 5510, 5645

321 SS is a titanium stabilized austenitic chromium-nickel stainless steel which was developed to provide an 18-8 type alloy with improved intergranular-corrosion resistance. This material is stabilized against chromium carbide formation by the addition of titanium. Since titanium has a stronger affinity for carbon than chromium, titanium carbide precipitates within the grains instead of forming at the grain boundaries. 321 stainless steel should be considered for applications requiring intermittent heating between 800ºF (427ºC) and 1650ºF (899ºC), or for welding under conditions which prevent a post-weld anneal.  321 stainless steel is non-magnetic.

We supply 321 stainless steel sheet in a variety of lengths and widths and can custom cut to your exact specifications. Our stainless steel coil can also be slit to your desired width. We are also suppliers of hex bar and 321 round bar stock.


321 Inventory Size Ranges

Sheet & Coil

0.011" - 0.130"

Sheet Quote Coil Quote
Plate

0.250"

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Bar

0.375" - 9.000"

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Hex Bar

0.4375” - 1.125”

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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

Other industry standards we comply with:

  • PWA-LCS
  • S1000 / S-SPEC-1
  • RR SABRe Edition 2
  • DFARS Compliant

Common Trade Names

  • ATI 321 (™ Allegheny Technologies)

Common Applications of 321

  • Aircraft exhaust stacks
  • Manifolds
  • Chemical processing equipment
  • Welded equipment
  • Jet engine parts
321 Chemical Composition
Element Percent by Weight
C Carbon 8.00%
Mn Manganese 200.00%
P Phosphorus 4.50%
S Sulfur 0.03
Si Silicon 75.00%
Cr Chromium 17.00-19.00
Ni Nickel 9.00-12.00
Ti Titanium 5x(C+N) min to 0.70 max
N Nitrogen 0.1
Fe Iron Balance

321 Physical Properties

 
Grade Density Modulus of Elasticity in Tension Melting Range
g/cm3 lb/in3
321 7.92 0.286 28 x 106 psi
193 GPa
1398-1446°C
2550-2635°F
347 7.96 0.288 28 x 106 psi
193 GPa
1398-1446°C
2550-2635°F

 

Mean Coefficient of Linear Thermal Expansion

Temperature Range Coefficients
°C °F cm/cm/°C in/in/°F
20-100 68-212 16.6 x 10-6 9.2 x 10-6
20-600 68-912 18.9 x 10-6 10.5 x 10-6
20-1000 68-1832 20.5 x 10-6 101.4 x 10-6

 

Thermal Conductivity

Temperature Range W/m·K Btu · in / hr · ft2 · °F
°C °F
20-100 68-212 16.3 112.5
20-500 68-932 21.4 147.7

 

Specific Heat

Temperature Range J/kg K Btu/lb · °F
°C °F
0-100 32-212 500 0.12

Magnetic Permeability

  • H/m Annealed
  • 1.02 Max

Electrical Resistivity

Temperature Range microhm·cm
°C °F
20 68 72
100 213 78
200 392 86
400 752 100
600 1112 111
800 1472 121
900 1652 126

Mechanical Properties and Yield Strength of 321

Mechanical Properties

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

Please contact us for more details.

The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.