Inconel 6625 Gr1 - PQR tensile requirements

[Balakrishnan Srinivasan]

Dear Experts,

Greetings for the day!!

I want to quality PQR for Base material UNS N06625 GR1 which has tensile property 827Mpa,   ERNiCrMo-3 Fillerwire was selected based on API582 & ASME sec II C recommendations. The filler wire tensile value is 760Mpa. 

In PQR tensile test result lies in between 760-827 Mpa.  The obtained tensile value is not greater than the base metal.   It can't fulfill the requirement of  QW-153 (ASME SEC IX).

As stated above clause QW153.1.c, " the applicable section".

Are there any provisions to qualify with lower strength than base metal?.

Reference WPSs were approved based on the tensile value being greater than filler metal tensile value (UTS)  760 Mpa  MIN (sec II C), But there we could not get explanations from the originators.

Please also refer, ASME-B 31.3  clause 328.3.1 (welding materials) & ASME sec VIII div1 QW-06 (non-mandatory guidelines for welding material selection.

Thank you

Balakrishnan S

[TDK YOKESH]

Hi Balakriahnan, 

I do have the same concern with Gr. 1 of UNS 6625 when welded with ERNiCrMo3 Kindly do reconfirm of grade again (Gr. 1 or Gr. 2) . Did you check if the filler mamufacturer can retest the tensile properties and provide the as welded values? 785Mpa  which is 95% of 827Mpa will suffice thd requirment.  We do all weld tensile test for every batch we receive. 

I hope the expert in this forum can guidw us to sort this out. 

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[PGoswami]

Hi

Some basic information on this alloy is  provided here. If the alloy is of Grade 1 type,  meeting the nominal UTS with ER-NiCr-Mo3 filler and matching SMAW electrodes may be difficult. This would NOT be an issue if the alloy is changed to Type 2,(Solution Annealed ) variety. Pleas find the relevant information as attached.

 

At the first place, I would like to know, what’s the rationale behind choosing Type-1 alloy(Annealed) , strength/weight reduction?

Response would be appreciated.

 

Thanks.

 

 

P.Goswami.P.Eng, IWE.

Independent  & Consulting Welding & Metallurgical Specialist

Cell/Whasapp- 1-905-979-3232

India( Mobile) Till 10th April- 91-8981917949

 

From: material...@googlegroups.com <material...@googlegroups.com> On Behalf Of TDK YOKESH
Sent: March 8, 2022 6:11 PM
To: material...@googlegroups.com
Subject: Re: [MW:32958] Inconel 6625 Gr1 - PQR tensile requirements

 

Hi Balakriahnan, 

 

I do have the same concern with Gr. 1 of UNS 6625 when welded with ERNiCrMo3 Kindly do reconfirm of grade again (Gr. 1 or Gr. 2) . Did you check if the filler manufacturer can retest the tensile properties and provide the as welded values? 785Mpa  which is 95% of 827Mpa will suffice thd requirment.  We do all weld tensile test for every batch we receive. 

I hope the expert in this forum can guidw us to sort this out. 

On Tue, Mar 8, 2022, 9:15 AM Balakrishnan Srinivasan <sbka...@gmail.com> wrote:

Dear Experts,

 

Greetings for the day!!

 

I want to quality PQR for Base material UNS N06625 GR1 which has tensile property 827Mpa,   ERNiCrMo-3 Fillerwire was selected based on API582 & ASME sec II C recommendations. The filler wire tensile value is 760Mpa. 

In PQR tensile test result lies in between 760-827 Mpa.  The obtained tensile value is not greater than the base metal.   It can't fulfill the requirement of  QW-153 (ASME SEC IX).

As stated above clause QW153.1.c, " the applicable section".

 

Are there any provisions to qualify with lower strength than base metal?.

 

Reference WPSs were approved based on the tensile value being greater than filler metal tensile value (UTS)  760 Mpa  MIN (sec II C), But there we could not get explanations from the originators.

 

Please also refer, ASME-B 31.3  clause 328.3.1 (welding materials) & ASME sec VIII div1 QW-06 (non-mandatory guidelines for welding material selection.

Thank you

Balakrishnan S

 

 

 

 

 

 

 

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[Balakrishnan Srinivasan]

Dear Mr.P.Goswami.P.Eng, IWE.

We received the material of UNS N06625 Gr 1 (827 Mpa) only.  As per the Welding consumable TC, the UTS is 772 Mpa which is higher than the requirement of ASME II C. The suitable consumable is ERNiCrMo-3 / ENiCrMo-3 as per API 582, ASME II C recommendations. But UTS of weldment lies less than 827Mpa.  Some textbooks ( Welding Metallurgy and weldability of Nickel base alloys - John C Lippold)  also explain that it can't be achieved.  My query is any provisions in the applicable codes to allow lower base metal strength.

Thanks,

Balakrishnan S

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[SN]

Dear experts,

Could  you please confirm that can we do MPT after  chromium carbide Coating. Since chromium  carbide Coating is suppose to be nonmagnetic.

Can anyone confirm  that chromium carbide Coating is magnetic or Non Magnetic..

Thanks 

[james gerald]

It is a compromise between Thickness & Strength based on allowable stress values. Check with your designer.

Thanks & Regards

J.Gerald Jayakumar

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[Sourav Bohrays]

You should do lpt

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[james gerald]

Pls find below the 2 grades of 625 Alloy.

Selection of suitable Alloy based on SMTS of consumable ENiCrMo3 is one option

& 2nd option would be to contact the welding consumable manufacturer for suitable consumable meeting the SMTS guaranteed with each batch.

Thanks & Regards

J.Gerald Jayakumar

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.

[Kannayeram Gnanapandithan]

if u r doing qualification as per ASME sec9, u have to check the minimum tensile value of base metal given in ASME not to refer the tensile value of MTC, MTC is to verify  whether we are doing on correct material. As per asme sec 9, minimum tensile value  for grade1, 2 values, one 760 and another  is 825, but Pno are same as P43. and group no is nil.  For Grade 2, minimum uts is 760 and Pno is P43, no group no.  Based on we can very well use NICrMo3 which is minimum of all weld, While doing PQR, the strength  may be more because we are going to Transverse tensile which includes base metal also.

Moreover 5% reduction is allowed as QW 153.1d

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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[manish kulkarni]

Hi

Pl check all weld metal strength. Many times higher values is achieved. 

Talk to consumable supplier for specific batch testing.

Regards


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[PGoswami]

Hi Balakriahnan, 

If the reduction in Tensile strength is not acceptable by your client, you may think about the option of switching  to ERNiMo-19 type of welding consumable. Here’re some salient information, which you be worth considering. You’ve to keep the process conditions also in mind.

Thanks.

P.Goswami.P.Eng, IWE.

Independent  & Consulting Welding & Metallurgical Specialist

Aramco Designated Project Welding Engineer(DPWR)

Cell/Whasapp- 1-905-979-3232

India( Mobile) Till 10th April- 91-8981917949

 

 

From: material...@googlegroups.com <material...@googlegroups.com> On Behalf Of Balakrishnan Srinivasan
Sent: March 9, 2022 2:04 PM
To: material...@googlegroups.com
Subject: Re: [MW:32961] Inconel 6625 Gr1 - PQR tensile requirements

 

Dear Mr.P.Goswami.P.Eng, IWE.

We received the material of UNS N06625 Gr 1 (827 Mpa) only.  As per the Welding consumable TC, the UTS is 772 Mpa which is higher than the requirement of ASME II C. The suitable consumable is ERNiCrMo-3 / ENiCrMo-3 as per API 582, ASME II C recommendations. But UTS of weldment lies less than 827Mpa.  Some textbooks ( Welding Metallurgy and weldability of Nickel base alloys - John C Lippold)  also explain that it can't be achieved.  My query is any provisions in the applicable codes to allow lower base metal strength.

 

Thanks,

Balakrishnan S

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CACd6DTwXDWDpJ4OPCG89H2wgHKe_rqTaf655GJHExHxaiEZ1zQ%40mail.gmail.com.

[SN]

Hi Experts,

Is there any IS or other standards to check properties of DM water such as Chlorine content, PH , Conductivity and Silica content  wherein acceptance limit of all above mentioned parameters are given.

Kindly provide  your valuable feedback

Regards

[Jenish Mistry]

Dear sir ,

I think requirements vary according to the application of Equipment & Client specification according to their application.

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Thanks for your best support.

Regards,

Jenish Mistry

[Mohd Siraj]

Dear bala,

1. where the tensile fracture occurred ? 

if base metal, it must be sure abvoe or equal to 827Mpa

if weld metal then around 760Mpa

prob is arise when fracture happned on HAZ...then 760-827Mpa is acceptable..