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The Scientific World Journal
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2015
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Article
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Tab 7
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Research Article
Application of Response Surface Methodology for Modeling of Postweld Heat Treatment Process in a Pressure Vessel Steel ASTM A516 Grade 70
Table 7
Estimated regression coefficients for tensile strength test.
Term
Coef.
Symbol
Constant
−285.521
—
PWHT time
15.7066
PWHT temperature
2.51431
PWHT time
PWHT time
−0.00463333
PWHT temp.
PWHT temp.
−0.00183000
PWHT time
PWHT temp.
−0.0295000