Since columbium and tantalum A240 Type 347 Plate have a stronger affinity for carbon than chromium, columbium-tantalum carbides precipitate within the grains instead of forming at the grain boundaries. Alloy A240 Type 347 Plate 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.
A240 Type 347 Plate Chemical Composition
| Grade | Mn | C | Cr | Fe | Ni | Si | P | S | Cb | |
| SS 347 | 2.0 max | 0.08 max | 17.00 – 20.00 | 62.74 min | 9.00 – 13.00 | 1.0 max | 0.045 max | 0.030 max | 10xC – 1.10 |
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