Solution Annealing

Heating stainless to roughly 1040-1120 °C and quenching rapidly, to dissolve carbides and intermetallics back into solution and restore full corrosion resistance.

The delivery condition

Austenitic and duplex plate is supplied solution annealed and pickled — that is what the 1D finish means. The rapid cool is as important as the soak: it is what stops carbides re-precipitating on the way down.

After hot forming

Any hot forming above about 650 °C puts the plate back into the sensitisation or sigma range. Duplex and high-alloy parts must be re-solution annealed and water quenched afterwards, or the corrosion resistance you paid for is gone.

Related terms

Sensitisation
Sigma Phase
Pickling & Passivation

Where this applies

Austenitic Stainless Steel Plate, Duplex & Super Duplex Plate

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