Re: [MW:32348] Lower - % Ferrite in Super Duplex Stainless Steel

Hi

Please check the  shielding Gas 

Argon + 2 % Nitrogen  purity levels 

purging gas  100 percent Argon . Better to control with less than 100 ppm

You should have purge monitor with least count .001 

Nitrogen also play important role is Austentic and ferrtic phase distribution .

Kr

Das 

On Thu, 29 Apr 2021, 12:50 pm Chintan, <chintan51@gmail.com> wrote:

Dear Expert, 

After Filling & Capping of  Weld Metal, During % Ferrite check via Feritoscope  values are showing less than requirement, How ever all other test i.e. Hardness, PMI etc. are well accepted. 

Kindly advice on  possible root cause as well as tips to achieve high Ferrite 

Please find below details for your quick ref. 

 Material Grade - SDSS -UNS s32760

Joint type -Pipe - Butt weld - 18 mm thick 

Welding Process - GTAW + SMAW 

Welding Consumable - ER 2594 + E 2594-15

% Ferrite - GTAW ( Root ) - 35%, SMAW ( Capping) - 25 -28 %, Base metal - 35to 40%, HAZ - 32 to 35% 

% Ferrite - Spec Req - 30  to 70%

Inerpass mentained - 100°C for GTAW, 120°C for SMAW

Heat input - GTAW - 0.8 to 1 KJ/mm

SMAW - 1.2 KJ/mm

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