[MW:19995] Re: 19992] PWHT AND TEMPERING OF LAS GR 11

Nowdays, all the client states this requirement, the reason is higher-strength normalized and tempered materials, there is consequently a possibility of reducing tensile properties of the base material, particularly if long holding times at the higher temperatures are used.

This practice is also adopted by the few code as per below ref.

1.Refer note (a) of table 5 - API 582, which states that for QT or NT materials, the PWHT holding temp shall be at least 15° C below the original tempering temperature of the base metal unless the fabricator demonstrates that mechanical properties can be achieved at a higher PWHT temperature and holding time.

2. ASME B31.3, Table 331.1.1 Requirements for Heat Treatment, Note 5 for P. No. 4 & 5A, 5B, 5C material.

To resolve your case if you have PTC of same heat treatment, you may carry out the mechanical testing and show the results for the client review.

Please share the out come of the topic.

Regds/Jignesh

On Tuesday, 4 February 2014 05:47:32 UTC+5:30, Antonio Diaz wrote:

Your client requires to get a hardness a little lower than hardness tempering. You should verify both hardnes material for tempering and pwht.

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De: Prasad
Enviado: 03/02/2014 16:26
Para: material...@googlegroups.com
Asunto: [MW:19992] PWHT AND TEMPERING OF LAS GR 11

WE HAVE FORGING FLANGES TO SA 182 GR11 Cl2 MATERIAL RECEIVED IN NORMALIZED AND TEMPERED CONDITION.

TEMPERING IS DONE AT 660 deg. C BY FORGING MANUFACTURER.

AFTER WELDING FLANGES COMPLETE EQUIPMENT POST WELD HEAT TRETEAD AT 660deg. C. AS PER ASME Sec VIII DIV. 1.

AS PER CLIENT SPEC. THERE SHOULD BE MINIMUM DIFFERENCE OF 20 deg. C IN TEMPERING & PWHT TEMPERATURE

WILL THIS PWHT TEMPERATURE WILL HAVE ANY ADVERSE EFFECT ON FORGINGS.

EXPERTS VIEWS ARE REQUESTED TO RESOLVE THIS ISSUE AND SOLUTION FOR ACCEPTANCE OF COMPLETED EQUIPMENT.

THANKS,

P.GHANEKAR

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