[MW:12564] RE: 12563] PWHT of modified P460 NL1 (1.8915) EN 10028-3

Dear Sir,

 

I don't know what ASME says about PWHT but in the EN 10028-3 there is a warning about PWHT for this material regarding holding time and/or temperature (see paragraph 8.2.4 of EN 10028-3). When the outcome of following formula comes above 17,3 there is a risk that the material properties will be reduced and no longer met the requirements of the specification.

 

P = Ts (20 + lg t) x 10^-3

 

Where Ts = PWHT temperature in °K and t is holding time in hours

 

If your outcome is above this 17,3 than you need to prove that all mechanical properties still meet the requirements by simulating PWHT on a sample from the same heat and thickness as used for your pressure vessel.

When executing more than one PWHT than you should calculate the value for each separate treatment and look at the sum of all treatments together.

Keeping this formula in mind you also can calculate any possible heat treatment conditions (temperature for thickness of 14,3 max. 630 °C)

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens David Stevenson
Verzonden: dinsdag 27 september 2011 23:27
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:12563] PWHT of modified P460 NL1 (1.8915) EN 10028-3

 

As this material is not in the tables can anyone provide the PWHT process for material 14.60mm thick in a pressure vessel built to ASME section VIII division 2?

 

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DAVID STEVENSON
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Eurotainer U.S. INC.
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email: dstevenson@usa.eurotainer.com ● website: www.eurotainer.com

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