Metallurgical affect / defect clarifications

[nawab ali bhatti]

Dear Expert 

Contractor has missed Preheat reports for 27 joints. As per WPS/PQR preheat required above 170 Centigrade , Material is Alloy P22, A335 (Cr2.25 and Mo 1)

Please share me your experience and suggestion, what action has to be taken to confirm the reliability and integrity of the joints,  if contractor will not find out missed preheat reports

I will wait for your immediately response

Thanks and Best Regards

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From: Ali Bhatti <nab_bha...@yahoo.com>
To: Nawab Ali Bhatti <bhat...@sabic.com>
Sent: Tuesday, May 24, 2016 2:34 PM
Subject: Fwd: [MW:24837] Metallurgical affect / defect clarifications

Sent from my iPhone

Begin forwarded message:

From: dili...@gmail.com
Date: 23 May 2016 at 6:51:02 pm GMT+3
To: 'nawab ali bhatti' via Materials & Welding <material...@googlegroups.com>
Subject: Re: [MW:24837] Metallurgical affect / defect clarifications
Reply-To: material...@googlegroups.com

Forming of non tempered martensite and formation of cracks

Sent from my BlackBerry 10 smartphone.

From: 'nawab ali bhatti' via Materials & Welding Sent: Παρασκευή, 20 Μαΐου 2016 - 05:37 To: Materials-welding Reply To: material...@googlegroups.com Cc: material...@googlegroups.com Subject: [MW:24813] Metallurgical affect / defect clarifications

Dear Experts

We have one project, Material is Alloy P22, A335 (Cr2.25 and Mo 1), Customer requirement 

" where heat treatment of low alloy steel is required the weld joint shall be immediately heat treated without allowing it to cool below 150C (300F). if this is not practical the weld and adjacent pipe shall be uniformly heated to min 300C (570F), kept for 20 minutes , wrapped with insulation allowed to cool and heat treated later"

Please tell me what will be metallurgical affect in weld area if above condition will not follow, only maintain preheat temperature 200C during welding as per WPS/ PQR and conduct the PWHT after one or two days

Best Regards

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[Kannayeram Gnanapandithan]

is it non tempered Martensite?, i think ,in P22 material, only Bainite will form. I may or may not be correct, experts, pl correct it?

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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