Type 347 stainless steel immune to high temperatures, high strength, stabilized by Columbium and Tantalum. Uses include exhaust manifolds, flash boilers, stack liners, firewalls, pressure vessels and boiler casings.

Principal Design Features: Similar to 321 stainless, 347 uses columbium as a stabilizing element to maximize its principal feature: resistance to intergranular corrosion. It can be used in applications requiring repeated heating in the range of 800 and 1650 F (427-899 C).

Applications: High temperature gaskets and expansion joints, rocket engine parts, aircraft collector rings and exhaust manifolds and 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: 347 may be welded by all commonly used fusion and resistance methods. Oxyacetylene welding is not recommended. When necessary, use AWS E/ER347 filler metal.

347 Chemistry

347 Physical Data

Round – 60° Staggered Center

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Round – 45° Staggered Center

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Center

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Round – Straight Center

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Center

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Round End Slot – Staggered and Straight Center

Length

Width

Center w

Center l

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Square End Slot – Straight Center

Length

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Center

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Square – Straight Center

Side

Center

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Hexagon

Diameter

Center

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* Holes per square inch
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