Research Article
Application of Response Surface Methodology for Modeling of Postweld Heat Treatment Process in a Pressure Vessel Steel ASTM A516 Grade 70
Table 8
Validation model experiments: comparisons with the predicted values.
| | Experiments number |
PWHT temperature °C |
PWHT time (hr) | Tensile strength (MPa) | Error % | | Experiments | Predicted |
| | 1 | 645.75 | 5.00 | 580 | 588 | −1.37 | | 2 | 645.75 | 5.00 | 594 | 588 | 1.01 | | 3 | 645.75 | 5.00 | 585 | 588 | −0.52 | | 4 | 645.75 | 5.00 | 592 | 588 | 0.68 | | 5 | 645.75 | 5.00 | 582 | 588 | −1.02 |
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