These stainless alloys are austenitic chromium steels containing columbium. The addition of columbium produces a stabilized type of stainless that eliminates carbide precipitation, and consequently, intergranular corrosion.
They are recommended for parts fabricated by welding, that cannot be subsequently annealed. They also are used for parts,that can be intermittently heated and cooled to temperatures between 800° and 1600° F.
Availability – Stainless Steel 347/347H
Seamless Pipe :1/2” – 12”
Weld Pipe :8” – 12”
Butt-Weld Fittings :1/2”-12”
Butt-Weld Flanges : 1/2″ – 12″
Bar : 1” – 12”
Specifications – Stainless Steel 347/347H
| ASTM | A312, A403,A182, A479, A276 |
| ASME | SA312, SA403, SA182 SA479, SA276 |
Chemical Composition – Stainless Steel 347/347H
| C | Co | Cr | Mn | Ni | P | S | Si | Ta |
|---|---|---|---|---|---|---|---|---|
| Max | Max | Max | Max | Max | ||||
| 0.08% | Trace* | 17.0 – 19.0 | 2.0% | 9.0 – 13.0% | 0.045% | 0.030% | 1.00% | Trace* |
Typical Applications – Stainless Steel 347/347H
- High temperature chemical process
- Heat exchanger tubes
- Refineries
- High temperature steam service
Tensile Requirements – Stainless Steel 347/347H
Tensile Strength (KSI): 75
Yield Strength (KSI): 30
KSI can be converted to MPA (Megapascals) by multiplying by 6.895.