347 Stainless Steel Sheet, Coil and Bar - AMS 5512, 5646
347 stainless steel is a columbium/tantalum stabilized austenitic chromium-nickel stainless steel. Type 347 has excellent intergranular corrosion resistance and oxidation resistance. at high temperatures. This material is stabilized against chromium carbide formation by the addition of columbium and tantalum. Since these elements have a stronger affinity for carbon than chromium, columbium-tantalum carbides precipitate within the grains instead of forming at the grain boundaries. 347 should be considered for applications requiring intermittent heating between 800ºF (427ºC) and 1650ºF (899ºC) or for welding under conditions which prevent a post-weld anneal. 347 is non-magnetic.
347 Inventory Size Ranges
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Standard Inventory Specifications
- UNS S34700
- AMS 5512
- AMS 5646
- ASTM A 269
- ASTM A 276
- ASTM A193
- ASME SA 269
- ASME SA 276
Other industry standards we comply with:
- EN 1.4550
- PWA-LCS
- GE Aircraft Engine (GT193)
- RR SABRe Edition 2
- DFARS Compliant
Common Trade Names
- ATI 347 (™ Allegheny Technologies)
Common Applications of 347
- Aircraft collector rings
- Aircraft exhaust stacks
- Boiler casings
- Cabin heaters
- Furnace heating elements
- Heavy wall welded equipment
Chemical Composition
| Element | Percent by Weight | |
|---|---|---|
| C | Carbon | 0.080% |
| Mn | Manganese | 2.00% |
| P | Phosphorus | 0.045% |
| S | Sulfur | 0.03 |
| Si | Silicon | 0.75% |
| Cr | Chromium | 17.00-19.00 |
| Ni | Nickel | 9.00-12.00 |
| Nb Ta | Columbium and Tantalum | 10xC min to 1.00 max |
| Fe | Iron | Balance |
347 Physical Properties
| Grade | Density | Modulus of Elasticity in Tension | Melting Range | |
|---|---|---|---|---|
| g/cm3 | lb/in3 | |||
| 321 | 7.92 | 0.286 | 28 x 106 psi 193 GPa |
1398-1446°C 2550-2635°F |
| 347 | 7.96 | 0.288 | 28 x 106 psi 193 GPa |
1398-1446°C 2550-2635°F |
| Temperature Range | Coefficients | ||
|---|---|---|---|
| °C | °F | cm/cm/°C | in/in/°F |
| 20-100 | 68-212 | 16.6 x 10-6 | 9.2 x 10-6 |
| 20-600 | 68-912 | 18.9 x 10-6 | 10.5 x 10-6 |
| 20-1000 | 68-1832 | 20.5 x 10-6 | 11.4 x 10-6 |
| Temperature Range | W/m·K | Btu · in / hr · ft2 · °F | |
|---|---|---|---|
| °C | °F | ||
| 20-100 | 68-212 | 16.3 | 112.5 |
| 20-500 | 68-932 | 21.4 | 147.7 |
| Temperature Range | J/kg K | Btu/lb · °F | |
|---|---|---|---|
| °C | °F | ||
| 0-100 | 32-212 | 500 | 0.12 |
Magnetic Permeability
- H/m Annealed
- 1.02 Max
| Temperature Range | microhm·cm | |
|---|---|---|
| °C | °F | |
| 20 | 68 | 72 |
| 100 | 213 | 78 |
| 200 | 392 | 86 |
| 400 | 752 | 100 |
| 600 | 1112 | 111 |
| 800 | 1472 | 121 |
| 900 | 1652 | 126 |
Mechanical Properties and Yield Strength of 347
| Property | Type 321 | Type 347 |
|---|---|---|
| Yield Strength, 0.2% Offset psi MPa |
30,000 205 |
30,000 205 |
| Ultimate Tensile Strength, psi MPa |
75,000 515 |
75,000 515 |
| Percent Elongation in 2 in. or 51 mm | 40.0 | 40.0 |
| Hardness, Max., Brinell (Plate) RB (Sheet & Strip) |
217 95 |
201 92 |
*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.