RE: [BULK]Re: [BULK] [MW:27683] Stainless steel (SA 312 TP 316L) welding

Hot cracking is caused by segregation of low melting point of impurities such as S, P etc. at grain boundary.  During solidification, the shrinking stress will cause cracking at the weakened grain boundary. 

 

The delta ferrite is the 1^st solid phase during solidification and the impurities can be absorbed by this ferrite phase due to larger interstitial space within the ferrite structure.  So certain amount of ferrite is required in 3XX SS weld to capture the impurities and prevent their segregation later in the Austenite grain boundaries.

 

Too many ferrite will decrease the toughness when the SS is intended for cryogenic application.  Too small amount of ferrite will not capture enough impurities to prevent hot cracking.  For cryogenic application, the ferrite # required is typically 3 ~ 5.

 

Hope this explain your question.

 

Thanks!

 

 

Feng Lu, Ph.D., NDE Level III Metallurgy and Welding Engineer

Zachry Industrial, Inc. 3600 West Sam Houston Pkwy South Suite 200 Houston, TX 77042 luf@zachrygroup.com Office: 713.979.2648 Cell: 512 797 5777 www.ZachryGroup.com

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kannayeram Gnanapandithan
Sent: Tuesday, April 10, 2018 10:42 PM
To: materials-welding <materials-welding@googlegroups.com>
Subject: [BULK]Re: [BULK] [MW:27675] Stainless steel (SA 312 TP 316L) welding

 

Could you elaborate the mechanism of Hot cracks if ferrite is less than 3

THANKS & BEST REGARDS,

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

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

 

On Tue, Apr 10, 2018 at 10:10 PM, PREM SHANKARDUTT NAUTIYAL <prem_nautiyal@rediffmail.com> wrote:

Ferrite number less than 3 can result in hot cracks in ASS.

Regards

Prem Nautiyal


PREM S NAUTIYAL
CELL : 9769316004





From: Kannayeram Gnanapandithan <kgpandithan@gmail.com>
Sent: Tue, 10 Apr 2018 18:11:30 GMT+0530
To: materials-welding <materials-welding@googlegroups.com>
Subject: Re: [BULK] [MW:27668] Stainless steel (SA 312 TP 316L) welding

 

what is the reason for Hot cracking

THANKS & BEST REGARDS,

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

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

 

On Tue, Apr 10, 2018 at 4:51 PM, Lu, Feng <luf@zachrygroup.com> wrote:

3 ~ 8% ferrite are required in the weld to prevent hot cracking

 

 

Feng Lu, Ph.D., NDE Level III Metallurgy and Welding Engineer

Zachry Industrial, Inc. 3600 West Sam Houston Pkwy South Suite 200 Houston, TX 77042 luf@zachrygroup.com Office: 713.979.2648 Cell: 512 797 5777 www.ZachryGroup.com

This e-mail may contain confidential and privileged material for the sole use of the intended recipient. Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply e-mail and delete all copies of this message.

 

 

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kannayeram Gnanapandithan
Sent: Tuesday, April 10, 2018 5:56 AM
To: materials-welding <materials-welding@googlegroups.com>
Subject: [BULK]Re: [MW:27666] Stainless steel (SA 312 TP 316L) welding

 

what is the necessity for ferrite testing on 316L

THANKS & BEST REGARDS,

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

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

 

On Tue, Apr 10, 2018 at 4:16 PM, Perumal Govindan <perumalgovindan@gmail.com> wrote:

Hi Prasad,

 

Ferrite testing is required when it is mentioned in the Client / Project Welding / Construction Specification.

 

 

With Kind Regards

 

P Govindan 

 

On Tue, Apr 10, 2018 at 11:24 AM, 'Shashank Vagal' via Materials & Welding <materials-welding@googlegroups.com> wrote:

NO

 

On Sunday, 8 April 2018 6:41 PM, Prasad Rode <purode333@gmail.com> wrote:

 

Dear sir,

I am going to do PQR for SA 312 TP 316L pipe to pipe of 6" and 7.11mm thickness.

I want to know that, i have to go for ferrite testing or not ?

If not, when it is essential to ferrite testing?

Regards
Prasad

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