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.
Inventory Size Ranges for
347
| Type |
Thickness |
Get a Quote |
Not finding what you are looking for? Connect with our specialty metals sourcing group.
Characteristics of 347
347 is advantageous for high temperature service. It offers high resistance to intergranular corrosion and oxidation at high temperatures. Types 347 alloys offer similar resistance to general, overall corrosion as the unstabilized chromium nickel Type 304. Heating for long periods of time in the chromium carbide precipitation range may affect the general resistance of Types 347 in severe corrosive media.
Working with 347
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.
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)
Industry Applications for
347
- Aircraft collector rings
- Aircraft exhaust stacks
- Boiler casings
- Cabin heaters
- Furnace heating elements
- Heavy wall welded equipment
Chemical Composition
Chemical Composition Percentage of 347
|
Element |
Min |
Max |
| 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 & Tantalum |
10xC |
1.00 |
| Fe |
Iron |
- |
Balance |
Physical Properties
- Magnetic Permeability: H/m Anneal 1.02 Max
Physical Properties 321| Grade | Density | Modulus of Elasticity in Tension | Melting Range |
|---|
| g/cm3 | lb/in3 | psi | GPa | °C | °F |
|---|
| 321 | 7.92 | 0.286 | 28 x 106 | 193 | 1398-1446 | 2550-2635 |
| 347 | 7.96 | 0.288 | 28 x 106 | 193 | 1398-1446 | 2550-2635 |
Mean Coefficient of Linear Thermal Expansion| 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 |
Thermal Conductivity| 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 |
Specific Heat| Temperature Range | J/kg K | Btu/lb · °F |
|---|
| °C | °F |
|---|
| 0-100 | 32-212 | 500 | 0.12 |
Electrical Resistivity| 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
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) |
| % Elongation in 2 in. or 51 mm | 40.0 | 40.0 |
| Hardness Max., Brinell (Plate) | 217 | 201 |
| Hardness Max., RB (Sheet & Strip) | 95 | 92 |
Additional Info
