Corrosion Fatigue and Near-Neutral pH Stress Corrosion Cracking of Pipeline Steel and the Effect of Hydrogen Sulfide
Why this work is in the frame
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Bibliographic record
Abstract
Crack advance has been studied in an X-70 pipeline steel, using the compliance technique. The electrolyte used in the study was a very dilute brine bubbled with 10% carbon dioxide (CO2). Cracking rates were studied at a range of frequencies and R-values (R is stress ratio). The R-values simulated typical high-pressure gas service, but the frequency used was significantly higher than that found in gas pipelines. Similar testing was carried out with the addition of 1% hydrogen sulfide (H2S) to the electrolyte using the Shell Canada sour gas test facility. Tests also were run to determine the rate of corrosion fatigue in the same solutions. The crack advance observed in dilute brine bubbled with 10% CO2 could be explained using corrosion fatigue and a threshold, ΔK, of 10 MPa√m. There has been some previous work done at lower frequencies in a less dilute but related electrolyte, and these data have been compared to the present results. The effect of 1% H2S was a dramatic increase in the cracking rate at these frequencies.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it