347 Stainless Steel
UNS S34700

Type 347 Stainless Steel is a high temperature stainless, which contains columbium as a stabilizing element.  When compared to typical 18-8 types of Stainless Steels, Type 347 possesses superior intergranular corrosion resistance. Type 347 is used in applications where intermitted heating between 800º and 1600º F is experienced. Type 347 Stainless Steel applications include aircraft exhausts, furnace stacks, jet engine parts, heat exchangers, and high temperature refinery processing equipment.   

ASME Boiler and Pressure Vessel Specifications
Sheet/ Plate Forgings Weld Fittings Rod and Bar Tubing - Welded/ Smls Pipe - Welded/ Smls Bolting- Bolts/ Nuts Filler Metals
SA240 SA182 SA403 SA479 SA249/ SA213 SA312/ SA312 SA193-B8/ SA194-Gr8 ER347

ASME Boiler and Pressure Vessel Chemical Requirements for Sheet/Plate
Note: all percentages max unless otherwise specified
C Mn P S Si Ni Cr Other
0.08 2.00 0.045 0.03 0.75 9.00-13.00 17.00-19.00 See Note A

ASME Boiler and Pressure Vessel Mechanical Properties for Sheet/Plate
Tensile Strength, Min ksi Yield Strength, (0.2% offset), Min, ksi Min. Elongation in 2", % Density lb/in³
75 30 40.0 0.289

A: Cb 10 x C min, 1.00 max

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