Skip to main content

[MW:17493] PWHT for CS weld in NaoH service

By Materials & Welding
Dear Experts,
 
Any idea or ref. for using CS without PWHT of piping welds with NaoH service?
The process fluid is almost 50% NaoH and design temp. of 82 Deg.C , operating temp. @35 Deg.C.
Now the issue is by using rubber lining on ID side of piping, still PWHT is required for CS welds?
Any literature available for NaoH service and CS materials?
 
Regards,
 
Manish Kulkarni
 


--- On Sat, 13/4/13, pgoswami <pgoswami@quickclic.net> wrote:

From: pgoswami <pgoswami@quickclic.net>
Subject: RE: [MW:17360] RE: 17261] Welding of E316L material -Reg
To: materials-welding@googlegroups.com
Date: Saturday, 13 April, 2013, 9:15 AM

Mr. Pandithan,
 
My Opinion as follows:-
 
 
C is 0.04% Max for SMAW electrodes. The Ferro alloys added through the flux also contributes "C" in the weld. If required electrode manufacturers could  formulate welding electrodes , with max "C"  below 0.04%, but it would be costly.
 
For GTAW filler, the chemical composition of the wire = the chemical analysis of the weld puddle. No alloys are added separately, except that alloys could be lost through turbulence or improper shielding. Hence achieving base filler with Max "C" of 0.03% is very practical, with the available stainless manufacturing routes.
 
Hence thinking all the pros and cons  the  above suggested limits   are  agreed on by  ASME  Sec-II ,Pt-C Code committee.
 
Perhaps  some  opinions from   consumable manufacturing industries would be appreciated.
 
Thanks
 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario , Canada .

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of kannayeram gnanapandithan
Sent: Thursday, April 11, 2013 8:01 AM
To: materials-welding
Subject: Re: [MW:17352] RE: 17261] Welding of E316L material -Reg

Dear Experts/Mr Goswami
In TIG welding rod ER316L, carbon is kept at max 0.03, In SMAW welding electrode E316L, carbon is kept at max 0.04 in all LOW Carbon electrodes. What is logic behind it
Generally for Carbide formation, minimum carbon require is 0.04
Pandithan
Welding Consultant


On Tue, Apr 2, 2013 at 2:36 PM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
As per SFA 5.9,   C is max .03% for ER 316L,, in this case what should be done?

Pandithan
Welding Consultant


On Tue, Apr 2, 2013 at 8:14 AM, pgoswami <pgoswami@quickclic.net> wrote:
Hi Siva,
 
If the intended service for S.S 316L is for corrosive environments , then the answer is NO.
 
Like base metals , welding consumables for SS 316 could be manufactured as "Dual Certified Grades". Example as per SFA 5.4
  • For E-316-XX-- Maxm "C" allowed is -0.08%
  • For E-316L-XX-- Maxm "C" allowed is -0.04%
If the electrode manufacturer " Restricts C to  0.04%, yet the  all mechanical test as per SFA 5.4  are passed, then  this grade could be certified as "Dual Certified Grade" , e.g -  E316/E316L-XX. Please check this point with electrode supplier. If the answer is yes then welding consumable certified as  E316/E316L-XX, are safe to use for welding S 316L.  However the consumable must meet any corrosion test, say ASTM A-262 Practice E, if required.
 
Hope this will guide you well to cope with the problem.
 
Thanks.
 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of siva subramanian
Sent: Monday, April 01, 2013 11:02 AM
To: materials-welding@googlegroups.com
Subject: [MW:17261] Welding of E316L material -Reg

Dear sirs,
                 I have one clarification regarding welding of SA240 GR 316L material.
May I use E316-16 to weld 316L material.If it is not possible means What is reason behind?

Please Clarify me.

Always Thankful,
A.Sivasubramanian
--
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/groups/opt_out.
 
 
--
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/groups/opt_out.
 
 


--
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/groups/opt_out.
 
 
--
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/groups/opt_out.
 
 

--
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/groups/opt_out.
 
 

Comments

Post a Comment

Popular posts from this blog

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
Post a Comment
Read more

[MW:5202] RE: 5200] NDT after PWHT

By Materials & Welding
------------------------------------- Interpretation:  I‑89‑14 Subject:         Section I (1986 Edition, 1987 Addenda), PW‑11,                  NDE Prior to PWHT Date Issued:     December 15, 1988 File:            BC88‑393   Question: Does PW‑11 require that NDE be performed on welds after they have been subjected to the postweld heat treatment required by PW‑39?   Reply: No, unless the conditions described in PW‑11.2.2 exist. ---------------------------------------------- Interpretation:  VIII-1-98-09 Subject:         Section VIII, Division 1 (1995 Edition, 1996 Addenda); NDE                 ...
Post a Comment
Read more