中文版 (Chinese): README_cn.md
API SC stands for Short-thread Coupling: API round-thread casing (short thread) with a standard coupling, manufactured to API 5CT (product specification) and API 5B (thread gauging).
For every size (OD × wall × grade) combination there are two mirrored editions:
| Edition | Language | Unit system | Directory |
|---|---|---|---|
| CN / SI | 中文 (Chinese) | SI — mm, MPa, kN, kg/m | SC_SI_CN/ |
| EN / USC | English | US Customary — in, psi, lbf, lb/ft | SC_USC_EN/ |
Both editions carry identical engineering content; only the language and units differ.
47 OD × wall-thickness combinations, 224 datasheets per unit system.
| Nominal OD (mm / in) | Wall thickness (mm) |
|---|---|
| 114.3 / 4.500 | 5.21, 5.69, 6.35 |
| 127.0 / 5.000 | 5.59, 6.43, 7.52 |
| 139.7 / 5.500 | 6.20, 6.98, 7.72 |
| 168.28 / 6.625 | 7.32, 8.94 |
| 177.8 / 7.000 | 5.87, 6.91, 8.05, 9.19 |
| 193.68 / 7.625 | 7.62, 8.33 |
| 219.08 / 8.625 | 6.71, 7.72, 8.94, 10.16 |
| 244.48 / 9.625 | 7.92, 8.94, 10.03 |
| 273.05 / 10.750 | 7.09, 8.89, 10.16, 11.43, 12.57, 13.84, 15.11 |
| 298.45 / 11.750 | 8.46, 9.53, 11.05, 12.42 |
| 339.72 / 13.375 | 8.38, 9.65, 10.92, 12.19, 13.06 |
| 406.4 / 16.000 | 9.53, 11.13, 12.57 |
| 473.08 / 18.625 | 11.05 |
| 508.0 / 20.000 | 11.13, 12.70, 16.13 |
Grades
- API standard grades: H40, J55, K55, M65, L80-1, N80-1, N80-Q, C90, T95, R95, P110, Q125
- Baosteel BG series (sour / special service): BG80S, BG80SS, BG90S, BG90SS, BG95S, BG95SS, BG110S, BG110SS, BG110T, BG125S
S= sour service (H₂S-resistant),SS= super-sour service,T= high-collapse / special-service variant.
These datasheets are provided for engineering reference only. Performance values are calculated at the 87.5 % minimum wall condition per API standards. For project-specific requirements and the latest values, please consult Baosteel.
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