An austenitic chromium-nickel-titanium stainless steel, Alloy 321 offers outstanding performance at temperatures up to 870°C.

Whilst retaining good strength and corrosion resistance when exposed to high temperatures, Alloy 321 will also maintain its strength and toughness at sub-zero temperatures.

  • UNS Number: UNS S32100
  • Werkstoff Number: 1.4541
  • ASTM: A240, A276, A312, A479, 5645
  • AMS: 5510

Product availability

Round Bar

Chemical analysis

Min179--5x (C+N)--0.25----


  • Aircraft piston engine manifolds
  • Expansion joints
  • Thermal oxidizers
  • Refinery equipment
  • High temperature chemical process equipment

About Alloy 321

Alloy 321 stainless is a titanium stabilised grade commonly used for service in the 538-870°C temperature range. For service temperatures up to about 870°C, a stabilising treatment at 842-899°C air cool, may be used to provide optimum resistance to intergranular corrosion in the heat affected zone (HAZ), and to polythionic acid stress corrosion cracking.

Alloy 321 stainless is readily welded by all common methods including submerged arc. Appropriate weld fillers are AWS ER347 bare wire and E347 covered electrodes. Alloy 321 stainless has good machinability and is readily fabricated.

For more information on Alloy 321 Stainless contact us, or fill in our online quote form and we’ll get right back to you!

  • Density: 7.916 g/cm³
  • Melting range: 1400 –1427°C

Mechanical & Physical Properties

Mechanical & Physical Properties20°C93°C204°C316°C427°C538°C649°C760°C871°C
Coefficient of Thermal Expansion, µm/m⁰C-16.716.9-1818.519.119.620
Thermal Conductivity/ kcal/(hr.m.°C)-13.114.4-1718---
Modulus of Elasticity, Dynamic/ x105 MPa-1.931.83-1.641.551.461.36-
Ultimate Tensile Strength/ MPa 579.2-427.5427.5427.5410.2110.396.5-
0.2% Yield Strength/ MPa 262-141.3124.1117.2113.8110.396.5-

Stress Rupture and Creep Properties

Stress Rupture and Creep Properties 566°C593°C621°C649°C677°C704°C732°C760°C788°C816°C
Average Stress Rupture 1,000 hours/ MPa -206.8-131-77.2-46.9-27.6
Average Stress Rupture 10,000 hours/ MPa 213.7162 119.3 88.9 66.9 49.6 37.2 27.6 21 15.9
Average Stress Rupture 100,000 hours/ MPa 158.6113.882.76043.431.722.816.912.18.6
Average Stress for Secondary (minimum) Creep Rate 1% in 1,000 hours/ MPa 206.8137.990.360.74026.517.611.77.85.2
Average Stress for Secondary (minimum) Creep Rate 1% in 100,000 hours/ MPa 93.863.440.726.917.611.
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