Thickness qualification range for duplex SS with PWHT (ASME IX)

[Pedro Alvarez]

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-Nº 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 1100ºC + Water quenching, ¿what 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

[Bathula Raghuram (Mumbai - PIPING)]

Dear Mr Pedro Alvarez

QW407.4 has been revised to include P10H, Please refer 2010 edition of ASME Sec IX, and maximum qualified thickness would be 27.5mm in your case.

 

 

Best regards

B. Raghuram

[p_cha...@mail.bg]

 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 (palvar...@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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-------------------------------------
Домейн .EU само за 1.98лв. за първата с ДДС + 3 месеца безплатен хостинг

[george....@gr.bureauveritas.com]

Do you have impact test requirements?
Any how at this temperature you are in the full austenitic range the 1,1 (like in the case of AC3) restriction applies

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04

[Pedro Alvarez]

Thanks,

I did not check this article in the new ASME IX Ed. 2010. I guess this
was included after my query to the ASME commitee.

Best Regards.

On 7 ene, 11:51, "Bathula Raghuram (Mumbai - PIPING)"

<R.Bath...@ticb.com> wrote:
> Dear Mr Pedro Alvarez
>
> QW407.4 has been revised to include P10H, Please refer 2010 edition of ASME Sec IX, and maximum qualified thickness would be 27.5mm in your case.
>

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