PWHT of modified P460 NL1 (1.8915) EN 10028-3

[David Stevenson]

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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[Pieper QSI]

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

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[pgoswami]

Hi David,

 

Please recall today's discussion on this subject. ASME Sec-IX is yet to assign any P No to this steel. Some authentic references on nominal composition and mechanical properties are available in this attachment.

 

This material is accepted for design and construction in Sec-VIII, DIV-2 code, through code cases ,i.e CC-2477 (approved June,2005), reapproved  as CC-2594 ,Nov-2007. ASME imposed some restrictions on this steel, e.g:-

1. thickness of plates not to exceed 20 mm (0.79 in)
2. max copper in the plate -0.20%
3. Vanadium, 0.10-0.20%
4. design temperature not to exceed 150 deg F(65 deg C)
5. PWHT Temperature range-985-1040 deg F(530-560 DegC),Minimum holding time 1/2 hr(30 min) at this temperature.

You may find more details in the code case.

 

Usually European consumable manufacturers ,ESAB, Bohler Thyssen or Metrode should be in a position to offer the recommended welding products for this steel. As this steel is a HSLA grade, often there may not exactly matching weld metal chemistry. However the consumable supplier definitely will have better idea.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario,Canada.

Email-pgoswami@sympatico.ca,

pgos...@quickclic.net

 

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of David Stevenson
Sent: Tuesday, September 27, 2011 5:27 PM
To: material...@googlegroups.com
Subject: [MW:12563] PWHT of modified P460 NL1 (1.8915) EN 10028-3

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