Re: [MW:34421] Corrosion Test Fail For Duplex Steel

1. The suitable welding consumable for welding SA 790 (UNS32205) is ER2209.

2. To pass ASTM G48 test, some  prefer using ER 2594  for the root pass (though it is a super Duplex SS).

3. The formation of Intermetallic compounds as detected IN ASTM A923 is because of below reasons.

    a.  Use of higher Alloy content consumable.

    b.  High Heat Input which in turn  reduces the cooling rate and inturn increase the time spent in the higher         

         temperature region which results in forming Intermettalic phases like Sigma phase and Chi phase.

Please provide a copy of WPS to understand the welding conditions. 

Also provide ASTM A923 Test Report.

Thanks & Regards

J.Gerald Jayakumar

On Tuesday, 18 July, 2023 at 10:56:14 am IST, Ashish Chacko <iamashleo007@gmail.com> wrote:

I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm.

However, I encountered a concern during the corrosion testing phase, as per ASTM A923-03 standards. Both test materials failed the corrosion test. I'm seeking guidance from the experts in this group to understand the possible reasons for the failure and to explore potential solutions or alternative approaches.

If anyone has experience with similar issues or insights into the matter, I would greatly appreciate your assistance.

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