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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 not sensitive to intergranular corrosion after heating within the range of carbide precipitation but elevated properties may be achieved through cold reduction.
Forms in Stock
- Pipe
- Fittings
- Flanges
Specifications
| Smls Pipe | ½”-12″ | 40s, 80s, 120, 160, XXH | ASTM/ASME 312 |
| B/W Fittings | ½”-8″ | 40s, 80s | ASTM/ASME 403 |
| Flanges | ½”-8″ | 150#, 300#, 600# | ASTM/ASME 182 |
Limiting Chemical Composition, %
| Ni…9.0-13.0 | Si…0.75 max. |
| Cr…17.0-19.0 | S…..0.03 max. |
| C…..0.08 max. | P…..0.045 max. |
| Mo…3.0-4.0 | Co + Ta…8 x C min. 1.00 max. |
| Fe…Balance | |
| Mn…2.0 max. |