Type 347 (UNS S34700) is an austenitic rolled coil stainless steel that is stablizied by the presence of niobium and tantalum. Combined, the niobium (columbium) and tantalum content are ten times greater than the carbon content present. Similar to Type 321, Type 347 has excellent creep-resistant properties, as well as high-stress rupture properties.
347 stainless steel rolled coil is used for its corrosion-resistant properties. It is also used for high-temperature applications up to 1650ºF.
347 Stainless Steel Specifications:
ASTM A240 for annealed condition
ASTM A666 for tempered material*
347 Stainless Steel Applications:
Aerospace
Aircraft exhaust manifolds, Jet engine parts
Automotive
Heat exchange tubing
Chemical Processing
Chemical handling equipment, Storage tanks for organic chemicals
| Composition per ASTM A240 | |
| Carbon | .08 Max |
| Manganese | 2.00 Max |
| Phosphorus | .045 Max |
| Sulfur | .030 Max |
| Silicon | .75 Max |
| Chromium | 17.00 – 19.00 |
| Nickel | 9.00 – 13.00 |
| Nitrogen | .10 Max |
| Molybdenum | |
| Mechanical Properties (Annealed, Per ASTM A240) | |
| UTS | 75,000 ksi Min |
| Elongation % in 2″ | 40.00 Min |
| Rockwell Hardness | RB95.00 Max |
Magnetic properties:
321 rolled coil stainless steel is generally non-magnetic.
Forming:
Type 321 can be easily formed and drawn, but it may require re-annealing after forming and drawing.
