34/347H | UNS S34700/S34709
Description
347/347H is an austenitic chromium steel containing columbium often used in refineries, high temperature chemical processing, and high temperature steam service. This columbium bearing steel is not sensitive to intergranular corrosion after heating within the range of carbide precipitation but elevated properties may be achieved through cold reduction.
Specifications Stocked
| Form Name | Size Range | Schedules | Specifications |
|---|---|---|---|
| Seamless Pipe | 1/2″ – 12″ | 40S, 80S, 120, 160, XXH | ASTM A312 / ASME SA312 |
| Buttweld Fittings | 1/2″ – 12″ | 40S, 80S, 160 | ASTM A403 / ASME SA403 |
| Flanges | 1/2″ – 12″ | 150#, 300#, 600# | ASTM A182 / ASME SA182 |
Limiting Chemical Composition %
|
C |
Co |
Cr |
Mn |
Ni |
P |
S |
Si |
Ta |
|---|---|---|---|---|---|---|---|---|
|
MAX |
Trace* |
17.0 – 20.0 |
MAX |
9.0 – 13.0 |
MAX |
MAX |
MAX |
Trace* |
*The columbium plus tantalum content shall not be less than 10 times the carbon content and not more than 1.0%. Note: 347H requires the columbiuim plus tantalum content to be not <8 times the carbon content and not >1.0%.
Typical Industrial Applications
- High-temperature chemical process
- Heat exchanger tubes
- Refineries
- High-temperature steam service
Tensile Requirements
|
Tensile Strength |
Yield Strength |
|---|---|
|
75 |
30 |
NOTE: The information and data in this product data sheet have been compiled from a variety of sources, and should be considered as a general guide only. The information and data included are accurate to the best of our knowledge, and may be revised at any time without notice. Energy Metals Inc. assumes no responsibility for the accuracy of this information.