RE: [MW:9136] Thickness qualification range for duplex SS with PWHT (ASME IX)

Dear Mr. Alvarez,

What you reference is QW-407.4 from 2007 Add.2009.

One of the changes in the edition from 2010 concerns exactly such cases. QW-407.4 says:

"For ferrous base metals other than P-No 7, 8 and 45,
when a procedure qualification test coupon receives a PWHT exceeding
the upper transformation temperature or a solution heat treatment for P-No. 10H materials, the maximum qualified base metal
thickness, T, shall not exceed 1.1 times the thickness of test
coupon".

So, your qualified thickness range is 27.5 mm.

Regards

Parvan Chavdarov

TÜV Rheinland IS GmbH

----- Цитат от Pedro Alvarez (palvarezmoro@gmail.com), на 07.01.2011 в 10:39 -----

Dear all,

I have a enquiry concerning the base metal thickness qualification
(ASME IX) range for a welding procedure of duplex stainless steel with
solubilization PWHT. I tried to get a response from ASME, but I did
not receive any answer.

According to QW-250s tables PWHT, for many welding technologies the
PWHT limits the maximum qualified thickness as per QW-407.4. This
article says: "For ferrous base metals other than P-Nє 7, 8 and 45,
when a procedure qualification test coupon receives a PWHT exceeding
the upper transformation temperature, the maximum qualified base metal
thickness, T, shall not exceed 1.1 times the thickness of test
coupon".

As far as I concerned, upper transformation temperature is Ac3
(ferrite to austenite transformation while heating) for a ferritic-
perlitic carbon steel.

If I have a coupon of 25 mm thickness of Dupex SS and I apply a PWHT
at 1100єC + Water quenching, їwhat do you think should be the maximum
qualified thickness range? 27.5 mm or 50 mm.

Regards.

Materials Science Ph.D Pedro Alvarez
LORTEK - Joining Technologies Research Institute
Spain

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