Localised Solution Annealing Duplex Casting

[dieselofdog]

Hi,

I have a casting made to ASTM A890 1A, Duplex Stainless. The casting has failed hydro testing, a weld repair has been made. I know Solution annealing is required. The question has been raised to conduct a workshop localised PWHT, heating to above 1100 deg C followed by quenching (buckets of water and wet rags).

I am concerned that potentially more damage could be done as there is a chance of forming embrittled precipitates in the surrounding region. I believe the entire casting should be uniforming heated and quenched.

Am I on the right path?

 

[metengr]

Yes, local solution heat treatment is NOT recommended.

 

[EdStainless]

Even though this alloy is less sensitive than some of the other duplex grades, you are correct.
The entire casting should be re-annealed and quenched.
Make sure that the quench tank is large enough to to assure adequate cooling.

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P.E. Metallurgy, Plymouth Tube