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Re: [MW:21726] Bend test was broken on A312 TP 321

By Materials & Welding
Dear Mr. Goswami

Thanks for your very good Interpretation .
We have carryout 2 time of WPQT and results same (2 test broken among 4 best test).
Aslo pls. find Certificate of Welding consumable & BM attached file for refer.

Best regards,


Vào 10:18:58 UTC+7 Thứ tư, ngày 27 tháng tám năm 2014, pgoswami đã viết:


Hi Nguyen,

The HT performed in the PQR was "Stabilizing Anneal". Typically this HT is recommended for SS 321 or SS 347 in refining environments. Ref NACE SP-170-2012 for details. 

For safe PQR qualification with stabilizing anneal:-

  1. the BM shall be stabilization annealed in the milll and the results shall be satisfactory in the CMTR
  2. the similar requirement shall be applicable for welding consumables also
  3. Nb content shall not exceed d 8 X "C" content  or 1.00%  max. Consumable with "C" in excess of this content may result in excess formation of Nb-Carbides(which is quite hard).
  4. This could result in loss of ductility and " Stress Relaxation Cracking during the PWHT.
I would say meeting most or all of the above clauses are essential. Also sharp corners could cause "bend failure". If it's established that sharp corners are the causes/s, then one may have"peace of mind" about metallurgical factors as stated above.
 
I would suggest if the issue is critical , then send the sample to a metallurgical lab.
 
Based on the finding of the failure mode(metallurgical or non-metallurgical causes) do the needful.
 
Thanks.
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of nguyen tuan
Sent: Monday, August 25, 2014 5:22 AM
To: material...@googlegroups.com
Subject: Re: [MW:21691] Bend test was broken on A312 TP 321


Dear 

Following specification" Where specified in Contractor Standards or by Licensor, fabrication welds in Type 
321/321H or 347/347H stainless steels shall be subject to a thermal stabilization at 
910ºC±10ºC for 4 hours "

Best regards,
Vào 16:12:00 UTC+7 Thứ hai, ngày 25 tháng tám năm 2014, George Dilintas đã viết:

321 is quenched and tempered in order to stabilize the austenite.
Why you did normalizing?

    best regards

    Dr. Georgios Dilintas

    Authorized Nuclear Inspector
    Authorized Inspector Supervisor


    I&F REGIONAL TECHNICAL MANAGER
    BUREAU VERITAS HELLAS

    Tel: +30 210 40 63 113/4
    Fax: +30 210 40 63 118
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    (See attached file: Dilintas_George.vcf)

Inactive hide details for Mahendra Arya ---25/08/2014 08:04:12---Dear friend May I know y u have normalizing for 8 hours....Mahendra Arya ---25/08/2014 08:04:12---Dear friend May I know y u have normalizing for 8 hours....

From: Mahendra Arya <mkarya...@gmail.com>
To: material...@googlegroups.com
Date: 25/08/2014 08:04
Subject: Re: [MW:21684] Bend test was broken on A312 TP 321
Sent by: material...@googlegroups.com



Dear friend

May I know y u have normalizing for 8 hours....
Is it any spec or job requirement...

On 23-Aug-2014 11:35 am, "nguyen tuan" <tuanpvecc@gmail.com> wrote:


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