Dear Forum Members,
I made a quick comparison between the above materials.
SA-350 Gr.LF2 is generally used for low temperature applications for forgings for forged or ring-rolled flanges, forged fittings and valves where notch toughness (Charpy Impact) testing is required, and had been a very well acceptable material for many years.
SA-765 Gr.2 is similar in content to SA-350 Gr.LF2, except that this specification was developed specifically for various forging components tube sheets, covers, channel barrels, integral forged channels, rings, nozzles, flanges,and similar parts..
For forged componenets,e.g a tube sheet, channel barrells etc and others the correct and probably the most recent specification should be SA-765 Gr.2.
In lieu of SA-765 Gr.2., SA 350LF2 is very well acceptable. SA 350LF2 generally have a proven history in low temperature services.
Appreciate answers from the others.
Thanks
Pradip Goswami
Welding and Metallurgical Engineer/Specialist.
Subject: [MW:3780] Tube sheet material for LTCS application SA350 Vs SA765
Date: Tue, 1 Dec 2009 16:03:00 +0530
From: R.Bathula@ticb.com
To: materials-welding@googlegroups.com
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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