Casting stainless steell / forged stainless steel body valve welding ends
Casting stainless steell / forged stainless steel body valve welding ends
(OP)
Hi, all..
I have problem, that supplier offers me a cryogenic ball / gate valves ASME class 300 / 600 (BW welding ends) body / bonnet made of casting CF8M. When I asked them, CF8M, doesn't problem with sensitization (intergranular corrosion, postweld heat treatment) cast stainless steel after welding for cryogenic application.
They confirmed that CF8M/ 316SS (with Charpy impact test) is ok, even for the body welding ends. Yes, we have good experience the CF8M.
I think that, to my knowledge, good engineering practice should be used CF3M / 316L SS (carbon below 0,035 %) instead CF8M / 316SS for cryogenic applications, and not only.
Many manufacturers of valves (the cryogenic valves) offer valves made of CF8M for welding.
According to ASME B16.34 ASTM A351 CF8M and CF3M are the same group materials 2.2.
Could you help me in this topic, explain to me about it.
Thanks a lot.
Viki





RE: Casting stainless steell / forged stainless steel body valve welding ends
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RE: Casting stainless steell / forged stainless steel body valve welding ends
RE: Casting stainless steell / forged stainless steel body valve welding ends
RE: Casting stainless steell / forged stainless steel body valve welding ends
RE: Casting stainless steell / forged stainless steel body valve welding ends