Type 321 stainless steel immune to high temperatures, stabilized by Titanium, resists intergranular corrosion, high strength. Used for aircraft afterburners, exhaust manifolds, cabin heaters, flash boilers, firewalls, and stack liners.

Principal Design Features: The key feature of 321 stainless is its resistance to intergranular corrosion. It employs titanium as a stabilizing element against chromium carbide formation. This alloy also exhibits strength characteristics superior to those of 304 stainless.

Applications: Jet engine parts, furnace heat treated parts, expansion joints, turbo superchargers, oil refiners, exhaust manifolds and high temperature chemical production equipment.

Machinability: Slightly tougher than 304 stainless, this material will produce the same tough stringy chips. The use of slow speeds and constant positive feeds will minimize this alloy’s tendency to work harden.

Welding: 321 may be welded by all commonly used fusion and resistance methods. Oxyacetylene welding is not recommended. When necessary, use AWS E/ER347 filler metal.

321 Chemistry

321 Physical Data

Round – 60° Staggered Center

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Center

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* Holes per square inch
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Round – 45° Staggered Center

Diameter

Center

OA

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Round – Straight Center

Diameter

Center

OA

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* Holes per square inch
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Round End Slot – Staggered and Straight Center

Length

Width

Center w

Center l

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* Holes per square inch
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Square End Slot – Straight Center

Length

Width

Center

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* Holes per square inch
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Square – Straight Center

Side

Center

OA

H.P.S.I *

* Holes per square inch
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Hexagon

Diameter

Center

OA

H.P.S.I *

* Holes per square inch
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