Hello Hayden, ASME Sec. II D, Table Y-1 lists yield stress values only upto temperature of 525 C, since the design T=570 C, hence the error message. I would be interested to know where did you obtain the yield strength value of 163.4 MPa? Anyway, I am not getting the above error message once I enter the yield stress manually just like you have shown. Maybe you can close the application and reopen to see if that makes a difference. Let me know if you have further questions. Sudip
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