Hello. I am wondering if it is acceptable practice to specify a minimum material yield strength in fabrication drawings? In particular, I am designing an open top tank (non pressure vessel) out of SA-240-316L and 304L plate and HSS materials. ASME section II specifies a yield strength of 25 KSI (19 KSI at 300F), however, typical MTR's for 1/4" plate quote yield strengths above 45 KSI. I would like to specify something above the published 25 KSI to reduce cost and weight.
Does anyone have experience doing this? Also, is there an accepted temperature de-rating factor that can be applied against actual yield test results?
I have asked suppliers and a steel mill to quote reasonably expected yield strengths so as to ensure I won't have a problem finding suitable materials. Still waiting for answers on that.
Thanks in advance for your help.
Does anyone have experience doing this? Also, is there an accepted temperature de-rating factor that can be applied against actual yield test results?
I have asked suppliers and a steel mill to quote reasonably expected yield strengths so as to ensure I won't have a problem finding suitable materials. Still waiting for answers on that.
Thanks in advance for your help.