Stainless Steel Alloy 321
Titanium Stabilized High Temperature Stainless
An electric furnace processed austenitic stainless with 18% chromium, 8% nickel, and a substantial titanium addition. The titanium forms stable carbides that tie up the carbon and keep chromium in solution. That is what gives 321 its corrosion resistance at temperature. Effective from 1,800 to 2,000°F, and up to 2,100 to 2,300°F in heat treating and forging work. Common in manifolds, exhaust stacks, ring collectors, jet engine parts, and furnace heat treated components.
Material Range
Comet Metals maintains aluminum inventory and converting capabilities across a wide range of sizes and formats.
| Thickness: | .0007” to .025” |
| Widths: | .250” to 36” |
| Tempers: | Ann, 1/4, 1/2, 3/4, full hard and spring |
| Finishes: | 2B, 4F, Dull and BA |
Built for use by:
Infrastructure
Automotive
Manufacturing
HVAC
Aerospace
Medical
Electronics
Specifications
| AMS Spec Number | 5510 |
| ASTM Standards | A167 |
| Principal Design Features | Higher resistance to extreme temperatures than 304. Titanium stabilizes against chromium carbide formation. Strength superior to 304. |
| Applications | Jet engine parts, furnace heat-treated parts, insulation applications, turbo superchargers, oil refiners, exhaust manifolds, high-temperature chemical production equipment. |
| Annealing | 1800 to 2000°F, air cooled, for maximum flexibility. Most stock is annealed. |
| Cold Working | Tough and ductile like 304; readily stamped, spun, shaped, and drawn. |
| Forging / Hot Working | 2100 to 2300°F recommended; do not work below 1700°F. Water quench or anneal after working for max corrosion resistance. |
| Hardening | Does not harden by heat treating (same as 304). |
| Welding | Weldable by all common fusion and resistance methods. |
| Workability | Slightly tougher than 304; will scale just before breakdown at its max temperature range. |
Chemical Properties
| Carbon (C) | 0.08% |
| Chromium (Cr) | 18% |
| Manganese (Mn) | 2% (Max) |
| Molybdenum (Mo) | – |
| Nickel (Ni) | 10.5% |
| Nitrogen (N) | 0.10% (Max) |
| Other Total | 0.70 Max; Ti 5x (C+N) Min |
Mechanical Properties
| Elongation (Annealed) | 40 (Min) |
| Rockwell (Annealed) | B95 |
| Tensile Strength (Annealed) | 75 to 110 |
| Yield Strength (Annealed) | 30 (Min) |
Physical Properties
| Coefficient of Thermal Expansion | 9.3 in/in/°F x 10^6 |
| Density | 0.285 lbs./cu.in. |
| Modulus of Elasticity | 28 x 10^6 psi |
| Thermal Conductivity | 9.3 BTU/sq.ft/hr/°F |
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