347 Stainless Steel Angle 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 Stainless Steel include:
- Aerospace
- Valve
- Oil Refineries
Products partially or completely constructed of 347 Stainless Steel include:
- Aircraft collector rings
- Chemical production equipment
- Engine parts
- Exhaust manifolds
- High temperature gaskets and expansion joints
- Rocket engine parts
- Stainless Steel Bars
- Fluid catalytic cracking units (FCC)
- Stainless Steel Pipes
- Recuperator stainless steel pipe fittings
- Especially where temperatures exceed 550°F and resistance to sulfidation is needed
- Fired heater stainless steel tubes
- Distributor trays and thermowells
- Equipment in and around reactors (good resistance to polythionic acid)
- Stainless Steel Flanges
Applications
- Chemical Processing
- Food Processing – equipment and storage
- Petroleum Refining – fluid catalytic cracking units, polythionic acid service
- Pharmaceutical Production
- Waste Heat Recovery – recuperators
347 Stainless Steel Angle Bar Date
| STOCKING DIAMETERS | ½” TO 24” |
|---|---|
| MATERIAL LENGTHS | UP TO 12’ |
347 Stainless Steel Bars SPECIFICATIONS
| UNS | TYPE | AMS | ASTM | FEDERAL | CHARACTERISTICS |
|---|---|---|---|---|---|
| S34700 | 347 Stainless Steel | 5646 5654 | A-276 A-314 A-479 | QQ-S-763 | 347 Stainless Steel is overall superior to 321 Stainless Steel, but with similar characteristics. 347 Stainless Steel is stabilized by cobalt and tantalum, easily welded, resists intergranular corrosion. |
347 Stainless Steel CHEMISTRY ANALYSIS
| 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 |
Source: Yaang Pipe Industry (www.yaang.com)
