Research Article
Physicochemical and Vibration Analysis of Christmas Tree Four-Way Flange Failure under Fracturing Process
Table 2
Chemical composition of the four-way flange and connecting valve.
| Element | C | Si | Mn | Cr | Mo | P | S | Ni | V |
| Four-way flange measurement results | 0.29 | 0.27 | 0.56 | 1.01 | 0.18 | 0.015 | 0.008 | 0.03 | <0.01 | Failure valve measurement results | 0.31 | 0.25 | 0.56 | 0.92 | 0.16 | 0.007 | 0.003 | 0.20 | 0.01 | Standard requirement | 0.26–0.33 | 0.17–0.37 | 0.40–0.70 | 0.80–1.10 | 0.15–0.25 | ≤0.025 | ≤0.025 | ≤0.30 | ≤0.30 |
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