| I request all our group members not to mention any consumable manufacturer's trade name in their queries. This forum has to be STRICTLY used for exchange of technical information related to Welding, materials & NDT and not make a mockery of any company or do sales publicity across the globe for others. It takes years of hard work to earn reputation in the market and few seconds to lose the same. We are not here to cause harm to the reputation of any local Indian company and publicise international brands. I hope you guys will cooperate and make the best use of this forum in a professional manner. Regards Prem Nautiyal Cell: 9769316004 The Indian Institute Of Welding Mumbai, India
--- On Wed, 8/29/12, Shankar gmail <shankarn6@gmail.com> wrote:
From: Shankar gmail <shankarn6@gmail.com>
Subject: Re: [MW:15151] RE: 15142] Problem about Positive material Identification(PMI)
To: materials-welding@googlegroups.com
Date: Wednesday, August 29, 2012, 8:42 AM
I feel you have got 5Cr 1Mo wire from the supplier whereas they have produced 9Cr1Mo V TC. it is not possible that the filler material chemistry and weld metal chemistry can change like this. You have no other option but to cut and re-weld. I would suggest that ban the supplier and be vigilant while procuring the consumables. When you have trusted suppliers for this P91 alloy with long term reputation are in the market there is no need for you to venture with D&H. As such P91 is a critical alloy to deal with ( a lot of attention is required at every stage right from selection of consumables till proper PWHT) and the application is also critical any negligence on this could be disastrous.
regards,
shankar
On Wed, Aug 29, 2012 at 4:48 AM, John Henning <jhenning@deltak.com> wrote: You clearly have the wrong filler metal – you are out of spec for Cr, V, and Nb. This filler metal will have far lower creep strength than the proper 91 chemistry filler metal. You need to remove any weld found with this type chemistry and re-weld with proper filler metal. If this filler metal is mismarked, you need to eliminate the supplier from your approved list. This is a major problem and could have disastrous consequences if it makes it out into the field. John A. Henning
Welding & Materials In our boiler one major problem occurred in Positive Material Identification(PMI) test [Spectrum test]. | Description | Reheater finishing outlet(RHFO) coil | | Material | T91 | | Size | ΓΈ 63 x 4 | | Process | GTAW only | | Filler wire | ER 90S B9 | | Filler wire Manufacturer | D & H Secheron | | Preheating °C | 185 | | Rate of Heating °C | 100/hr | | Interpass temp °C | 190 | | Post heating °C | 100 | | PWHT °C | 750 | | Soaking Time | 90 minutes | Around 800 joints welded in the above approved procedure only. Filler wire, header stub, RHFO coil, weld metal undergone PMI test separately and all show positive material results as T91 except weld metal. Weld metal shows the Chromium content only as (4-7%){Reqd is 8-10.5%}. We can't find how it happened? Our Chinese consultant told to cut and reweld all the joints. But our contractor argued that we followed approved procedure and used approved vendor's consumable only. Please give a solution. Here I have attached one preheating cum PWHT chart of RHFO joints(for 11 joints,5 thermocouples,1 recorder).All 800 joints are not checked yet. Only 40 joints checked and all 40 weld metals shown low Cr Content. Please go through the below readings of one RHFO joint. | Description | Filler wire | Header stub | Weld metal | RHFO coil | | Alloy | T91 | T91 | A-2 | T91 | | Cr | 8.94 | 8.34 | 5.19 | 8.68 | | Mo | 0.96 | 0.90 | 0.93 | 0.92 | | V | 0.17 | 0.17 | 0.08 | 0.19 | | Ti | 0.07 | 0.10 | 0.04 | 0.03 | | Mn | 0.60 | 0.40 | 0.54 | 0.63 | | Fe | 87.81 | 88.11 | 90.86 | 87.61 | | Ni | 0.12 | 0.33 | 0.20 | 0.38 | | Cu | 0.02 | 0.16 | 0.20 | 0.16 | | Nb | 0.09 | 0.08 | 0.03 | 0.04 | | W | 0.15 | | 0.00 | | Waiting for your valuable suggestions. --
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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.
--
Shankar
9994562774
--
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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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