PWHT on austenitic stainless steels (like 316,304) is rarely applied ad “stress relieving”.
Sometime applied in medium-small size pressure components ( welded).
The temperature are in the range 205-480 °C max, normally carried out ad 300 °C but only with the scope to get an effective stress-relieving.
Heat treatment carried out in dedicated & ventilated (electric furnaces), in order to avoid or control possible distortion/warpage.
Joseph B ,
welding & material eng.
Inviato: mercoledì 3 novembre 2010 8.45
Oggetto: Re: additional detail[MW:8038] effect of PWHT Temperature at 600 DEG CELSISIUS ON SS 316L
If you PWHT with Austenitic SS (SS316) internal sensitation happened at 450 to 600 degrees which will reduce the corrosion resistance of SS316(chromium becomes chromium carbide).
But in your case it is SS316L ,for this it may PWHT since 'L" grade has stabilising elements like Ti,Cb,Nb which will help to reduce the sensitation.
So if you are not ready to dismantle the internal for PWHT,you may go with SS316L internal for PWHT.
Thanks & Regards,
Getabec Energy Co.,Ltd.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282
Contractor is doing PWHT of the Carbon Steel Vessel along with SS316L INTERNALS ( BEAMS, CHANNELS) Bolted with the Vessel. PWHT temperature is 600 DEG CELSIUS.
Pls suggest me whether it is allowed. what will be the effect on mechanical proerties/corrosion ressiatnce proerties of SS 316L becuase of the PWHT Temperature.
Thanks in advance for your valuable suggestions.
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