RE: [MW:21718] Bend test was broken on A312 TP 321

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

pgoswami@quickclic.net

pradip.goswami@gmail.com

http://ca.linkedin.com/pub/pradip-goswami/5/985/299

 

---

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of nguyen tuan
Sent: Monday, August 25, 2014 5:22 AM
To: materials-welding@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
Cell: +30 69 44 64 62 04
(See attached file: Dilintas_George.vcf)

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:

Hi All

 when we carryout PQR for material A 312 TP 321 welding to  A312 TP 321 (pipe 8'' SCH 120)
1. Welding Process GTAW+SMAW
2.Welding consumable ER347+E347-16
3.Interpass max 175 oC
4.pwht :900 Celsius at 8 hours 
5. Code applied ASME 

problems: 2 side Bend test were broken 

Can some body know or  have experience  above problem 

Tuan 

QA/QC posco



--
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
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.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm

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.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

This message contains confidential information. To know more, please click on the following link: http://disclaimer.bureauveritas.com

--
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
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.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.