Available Shapes
321 Stainless Steel
Alloy 321 is an austenitic chromium-nickel stainless steel containing Titanium which is recommended for parts fabricated by welding which cannot subsequently be annealed. Type 321 is a stabilized austenitic stainless steel similar to type 304 but with a titanium addition. This titanium addition reduces or prevents carbide precipitation during welding and in 800 – 1500 °F (427 – 816 °C) service. It also improves the elevated temperature properties of the alloy. Type 321 provides excellent resistance to oxidation and corrosion and possesses good creep strength.
Related Specifications
1.4845 310S21 310S24 310S31 BS 970 AISI 310S BS EN 10088-1 X8CrNi25-21
Applications
Analysis
Corrosion Resistance
Welding
Typical Physical Properties
Applications
Aircraft collector rings,
exhaust stacks,
carburetor air intensifier tubes,
exhaust manifolds,
flexible couplings,
jet engine parts,
mufflers,
pressure vessels,
tubing,
fasteners,
flexible metal hose and bellows
Analysis
| Carbon | 0.08% max | Chromium | 17.00-19.00% |
| Manganese | 2.00% max | Nickel | 9.00-12.00% |
| Silicon | 0.75% max | Sulphur | 0.030% max |
| Nitrogen | 0.10% max | Phosphorous | 0.045% max |
| Titanium | 5x(C+N) min to 0.70% max |
Corrosion Resistance
The Type 321 alloy offers similar resistance to general, overall corrosion as the unstabilized chromium nickel Type 304. Heating for long periods of time in the chromium carbide precipitation range may affect the general resistance of Type 321 in corrosive media.
Welding
Austenitic stainless steels are considered to be the most weldable of the high-alloy steels and can be welded by all fusion and resistance welding processes.
Typical Physical Properties
| Temp ºC | Density Kg/m³ | Mean Coefficient of Thermal Expansion | Modulus of Elasticity kg/mm | Electrical Resistivity Ωmm²/m | Specific Heat Capacity kcalºC |
|---|---|---|---|---|---|
| 20 | 7.90 | 17×10-6 | 20000 | 0.7 | 0.105 |
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