Welding of ss321 material with PWHT

[Vijay Katkar]

Dear Experts 

We have vessel with S321 grade 

Material with following Details,

Thickness- 62mm

Code- ASME Sec -VIII DIV-1

PWHT temp- 900Deg.

PWHT Socking time- 4hrs

We are facing problem to get SAW consumables with this heat treatment, as this is customer requirement.

1) Is there any changes with this heat treatment on material and Welding properties?

Need your expert advice.

Thank you 

Vijay Katkar

[pgoswami]

Hi Vijay,

 

The suggested HT cycle conforms to Stabilizing Anneal Heat Treatment, typically applied for SS 321 & SS 347 base metals and  weldments.  The intention of stabilizing anneal is to improve the resistance of BM, welds and HAZ to Polythionic Acid Stress Corrosion cracking (PTASCC).

 

NACE RP/SP-170-2012 gives a broad outline of PTASCC, causes, mitigation etc. Many clients, in your part of the world, such as Saudi Aramco have robust and more detailed requirements related to outlined in their specifications.

 

In order to meet the PTASCC testing requirements on the weld, welding fillers should preferably be procured with complying PTASCC testing requirements.

 

One needs to convey clients  requirements to welding consumable manufacturers and manufacturers  have separate batches tested to these requirements.  

 

This heat treatment is not as common as Solution Anneal, however this is a well established requirement for refining environment.

 

Hope this clarifies your doubt.

 

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist.

Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgos...@quickclic.net

pradip....@gmail.com

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