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Chemical composition (wt.%) of the tube materials.
| Element | Un-failed Tube | Failed Tube | SA-209 Gr T1a Specification (ASME, 2010a) |
|---|---|---|---|
| C | 0.20 | 0.19 | 0.15–0.25 |
| Mn | 0.67 | 0.40 | 0.30–0.80 |
| P | 0.019 | 0.020 | 0.025 (max.) |
| S | 0.006 | 0.016 | 0.025 (max.) |
| Si | 0.20 | 0.021 | 0.10–0.50 |
| Mo | 0.47 | 0.47 | 0.44–0.65 |
