Hi,
Even though the material manufacturer Re-issue a certificate is not enough to make sure the chemical composition match with the code.Anyhow you can use this for a document purpose.
But you cannot find the Nitrogen content by PMI.
You have to go for higher end spectro meter like OES (Optical Emission Spectrometer /XRF(Xray Fluorescence Spectrometer) to make sure all compositions are match with the CODE requirements,This will be the right solution.
But very few labs or Universities have these equipments.Some labs provide field analysis also with the above equipments.
Thanks & Regards,
(Karthik)
Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282
--- On Fri, 1/28/11, murugesan jeyaraman <jmurugesan@gmail.com> wrote:
From: murugesan jeyaraman <jmurugesan@gmail.com>
Subject: [MW:9532] Duplex stain less steel certificates misses nitrogen content
To: materials-welding@googlegroups.com
Date: Friday, January 28, 2011, 9:17 AM
Dear all I reviewed a Material certificate for Duplex SS, Plate A240 UNS S31803 and found Nitrogen content .08 – 0.2% as required by ASME sec II part A is not at all mentioned in the certificate. As vessels are fabricated and welded I issued a NCR to manufacturer. Vessel manufacturer are going to ask Mill about this. 1) My question is how come a Mill certificate misses an essential element of composition required by the code? If the Mill comes with a reply that it is a clerical error to miss the Nitrogen content, and re-issue a certificate, can we accept it as genuine? 2) Is nitrogen content can be analysed by PMI or any other analyzing method in a lab test. Because the vessel fabricator say they are going to do lab test, for this. Please share your experiences and opinion about this. Thanks Murugesan -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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For more options, visit this group's bolg at
http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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