347 Stainless Steel Bar
UNS S34700 (Grade 347)
347 stainless steel bar, also known as UNS S34700 and Grade 347, is an austenitic stainless steel made of .08% maximum carbon, 17% to 19% chromium, 2% maximum manganese, 9% to 13% nickel, 1% maximum silicon, traces of phosphorus and sulfur, 1% minimum to 10% maximum columbium and tantalum with the balance of iron. Grade 347 is advantageous for high temperature service because of its good mechanical properties; it also has excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800° to 1500° F. It is similar to Grade 321 with respect to intergranular corrosion which is achieved through the use of columbium as a stabilizing element to maximize this feature. Grade 347 can not be hardened through heat treating, but elevated properties may be obtained through cold reduction.
Industries that use 347 include:
- Aerospace
- Valve
Products partially or completely constructed of 347 include:
- Aircraft collector rings
- Chemical production equipment
- Engine parts
- Exhaust manifolds
- High temperature gaskets and expansion joints
- Rocket engine parts
| Stocking Diameters | ½” to 24” |
|---|---|
| Material Lengths | Up to 12’ |
| Uns | Type | Ams | Astm | Federal | Characteristics |
|---|---|---|---|---|---|
| S34700 | 347 | 5646 5654 |
A-276 A-314 A-479 |
QQ-S-763 | 347 is overall superior to 321, but with similar characteristics. 347 is stabilized by cobalt and tantalum, easily welded, resists intergranular corrosion. |
| C | MN | P | S | SI | CR | NI | MO | CU | OTHER | M/NM |
|---|---|---|---|---|---|---|---|---|---|---|
| .08 | 2. | .045 | .03 | 1. | 17. - 19. | 9. - 13. | .5 | .5 | Cb + Ta = 10xC Max. | NM |
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