I have come across few client specifications where SA350 LF2 is prohibited for use as tube sheet/non std flange material (MDMT -29 to -48 °C), instead SA765 Gr II is selected.
Apart from the scope of SA765, which clearly indicates it is for use as non standard forgings, such as tubes sheets, barrels etc, where SA 350 is silent on this part
It is common to use SA350 LF2 as tube sheet material, and as large dia vessel body flanges (not covered by ASME B16.5/16.47), and never had any problem interms of weldability or toughness etc.
Any views or failure of SA 350 LF2, if anybody come across please share.
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