Alloy 347H is a stabilized, austenitic, chromium, stainless steel containing columbium which allows for the elimination of carbide precipitation, and, consequently, intergranualr corrosion. Alloy 347H is stabilized by the additions of chromium and tantalum and offers higher creep and stress rupture properties than alloy 304 and 304L which may also be used for exposures where sensitization and intergranualr corrosion are of concern. The addition of columbium also allows Alloy 347 to have excellent corrosion resistance, even superior to that of alloy 321H.  347H is the higher carbon composition form of Alloy 347 and demonstrates improved high temperature and creep properties.

Type 347H Major Design Features Include:

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• Similar resistance and corrosion protection as Alloy 304

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• Used for heavy welded equipment when annealing is not possible

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• Good oxidation resistance, on par with most other austenitic stainless steels

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• Higher carbon allows for better high temperature creep properties

347H Applications:

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• Boiler tubes and casings

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• Oil and gas refinery piping

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• Radiant superheaters

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• High-pressure steam pipes

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• Heat exchanger tubes

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• Cabin heaters

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• Heavy wall-welded equipment

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• Aircraft exhaust stacks and collector rings

If you are interested in other Stainless Steel Coil, please click 302, 303, 304, 304L, 304H, 309, 309S, 310, 310S, 310H, 316, 316L, 317/317L, 317LMN, 321, 321H, 330, 347, 347H, 904L, 403, 405, 409, 410, 410S, 410/HT, 416, 416HT, 420, 422, 430, 440C, Duplex 2205, Duplex 2304, Duplex 2507.