Values of yield strength degradation coefficient for design temperatures exceeding 90 degrees according to GB50341-2014
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According to the GB50341-2014 standard, for the design conditions involving Q345R wall plates with a thickness of t=12 mm and a design temperature of T=205°C, the value is taken from API650-2013 M.3.2(P368) – that is, the yield strength reduction factor. When the design temperature T is 90°C or less, α=1; otherwise, α is determined using Table M-1a(P369) in API650-2013. According to the API650 standard, should an interpolation method be used for values between 310 MPa and 380 MPa at temperatures of 200°C and 260°C? Please give me some advice! Thank you!
310MPa＜380MPa: Interpolation at 200℃ and 260℃ is acceptable.
Design temperature: 205 ℃ I calculated using this interpolation method: 260 ℃, 200 ℃, 0.7, 0.75. α = 0.7 + (0.75 – 0.7)/200 – 260) * (205 – 260) = 0.745833333. The result obtained is different from the value given in the calculation manual; could there be a mistake in the calculation? Please give me some advice.