Materials & Welding: RE: [MW:31261] Combination of PQRs

Sunday, August 2, 2020

RE: [MW:31261] Combination of PQRs

Good morning Gigi,

Well, I will try to be explicit as much as possible.

Welding a type 904L steel (high-alloy austenitic stainless steel) with filler type ERNiFeCr-1, has the following consequences:

-Both materials solidify in the austenite phase, with exponential increase in hot thermal expansion, which makes the weld susceptible to hot cracking in the HAZ.

-An indicator of this behavior, we can see it in a Schaeffler diagram, where if the filler metal ERNiFeCr-1 is used, the nickel equivalent (austenite phase former) rises considerably. There is no delta ferrite, a phase that helps prevent the weld from cracking during solidification.

- On the other hand, if ERNiFeCr-1 is used for the 904L, the Mo content in the weld is weakened and with it, reduces the resistance to pitting in chloride environments and the risk of cracking in sulfuric acid environments.

For this reason, whenever possible, we must use filler materials that are most compatible with the base metal, both in chemical composition and in the formation of the most similar solidification structures.

To solve this 904L welding problem, filler material ER385 was created. They remain as brothers at the end of everything.

I hope my comments serve you,

Regards,

Ramon Briceno / Metallurgical Engineer - Oil & Gas

www.linkedin.com/in/ramon-briceño-976265b5

De: 'Zeghanu Gigi' via Materials & Welding <materials-welding@googlegroups.com>
Enviado: domingo, 2 de agosto de 2020 3:14 a. m.
Para: materials-welding@googlegroups.com <materials-welding@googlegroups.com>
Asunto: Re: [MW:31254] Combination of PQRs

Good morning,

Dear Ramon as Metallurgical Engineer ,are you so kind to give us your opinion related the microstructure,mechanical properties,etc affected if austenitic SS 904 is welded with ER NiCr,ER NiFeCr(SFA-5.14 filler metal)?

Seems to be interesting.

Regards

Gigi

On Sunday, 2 August 2020, 07:30:50 EEST, Customer Care <bricenori@hotmail.com> wrote:

Dear Prasad,

It seems to me that your proposal is not valid because the INCOLOY 825 alloy belongs to the family of nickel base alloys with filler metal within SFA 5.14. (for example ERNiFeCr-1).

904 L is a high alloy austenitic stainless steel and must be welded with filler metal of the same composition within SFA 5.9 (ER385) and also to weld the SS 317 / 904L combination.

You should prepare WPS with PQR for this 904L alloy.

Regards,

Ramon Briceno / Metallurgical Engineer -Oil & Gas

www.linkedin.com/in/ramon-briceño-976265b5

Sent from Mail for Windows 10

From: prasad loke
Sent: Saturday, August 1, 2020 7:20 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:31251] Combination of PQRs

Dear Sir,

Greetings !

We are in need your expert opinion on following issue,

We have WPS/PQR for Incolloy 825-Incolloy 825 ( P number 45)----Filler used for same is from SFA 5.14

Now We have a requirement of SS904L to SS904L welding.( P number 45)---Where recommended filler is ER385 with SFA 5.9

If we make WPS with filler from SFA 5.14 for this (SS904L to SS904L) welding as P number is same, can it be supported with existing PQR of Inc-825 to INC-825 ?

Thanks in advance.

Regards

Prasad Loke

On Mon, Jul 27, 2020 at 1:03 PM K K <karan.hbl@gmail.com> wrote:

Hi Experts,

"Good Morning"

According to my line classes, I required NACE+HIC+PWHT Wet H2 services.

What is the test shall be conducted according to the standard to meet the requirements?

I have one PQR with NACE+PWHT+Wet H2S services, but not HIC test.

In addition, I have qualified one HIC tested PQR without PWHT no other lab test certificates, shall I combined this PQR to the above requirements( NACE+HIC+PWHT+wet H2S).

For your information, the HIC test is an additional requirement of our specifications.

Please looking your feedback on my above query.

Thanks and Regards

Kiran

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