SS 410S weld overlay/restoration

[sushildwivedi16]

Hello everyone.

The datasheet of one of the equipment which is under fabrication in our workshop states the requirement of SS 410S clad on SA 516 Gr. 70. For the purpose of clad restoration and the nozzle overlay, we used ENiCrFe-3 electrodes in accordance with API 582 recommendations. Design temperature 426 deg C. The procedures (no PWHT applicable) were qualified and approved by the client QC team. However,after the completion of the weld overlay, the client is now saying that their process team has rejected the use of ENiCrFe-3 since the datasheet states SS 410S and we have to comply with the same.

What can be the probable reason for the rejection of ENiCrFe-3 (also recommended by API) for clad restoration and weld overlay when the datasheet states SS 410S ? We tried to qualify the overlay PQR with E410 but the chemical analysis falls in the martensitic region of WRC diagram.

Thanks in advance

SD.

 

[weldstan]

Possible reason is potential for sulfidic corrosion (inter granular) of the nickel alloy filler depending on the environment.

 

[metengr]

This is a nonconformance and has to be resolved between you and the client. If the client specified 410S clad this is what is required. In addition, using the 410S clad can be done with a butter layer over the carbon steel substrate to avoid martensitic structures in the fusion zone.

 

[DVWE]

The procedures (no PWHT applicable) were qualified and approved by the client QC team.

This seems to me to be your client's problem, and should be of no cost to you to resolve this within the client's satisfaction.

 

[EdStainless]

Of course it will, 410S is fully ferritic, and add a little C and it will be martensitic.
Yes, this is your clients problem.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[weldstan]

Since the client originally approved your repair and a subsequent representative of the client disapproved it after the fact, the client must pay for the new repair should that be required. It has not been uncommon, in my experience, when one client representative disagrees with another representative. Sometimes the representative with the most clout and responsibility is the last to know in the decision making process.