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 |
Notes:
A: Cb 10 x C min, 1.00 max
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