Forging Super Duplex Stailess Steel
Forging Super Duplex Stailess Steel
(OP)
I understand that best forging practice for super duplex stainless steels (eg A182F55) requires water quenching immediately after forging is completed rather than air cooling even though the parts are subject to subsequent solution treatment.
Has anyone had experience of water quenching this material after forging and if so how was it done in a practical sense?
Has anyone had experience of water quenching this material after forging and if so how was it done in a practical sense?





RE: Forging Super Duplex Stailess Steel
I could envision after hot forging if the material is immediately reheated to the solution treatment temperature range and water quenched, as a single operation. Typically, soak time prior to forming is critical for these alloys.
RE: Forging Super Duplex Stailess Steel
These alloys are very cooling rate sensitive.
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Plymouth Tube
RE: Forging Super Duplex Stailess Steel
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel
The duplex and superduplex steels are not to be slow cooled because, as mentioned above, intermetallic compounds will form. These alloys are designed for rapid cooling rates. Hot forming temperatures and maintaining the temperatures are more critical for these alloys.
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel
1) Forging operation (simple forging IE pancake)
2) Air-cool
3) Solution Treat
4) Quench (depends on desired results as far as polymer, oil, water go)
So the quench really controls how the intermetallics form?
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel
The intermetallics will seriously lower the corrosion resistance long before you will see the impact on mechanical toughness.
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Plymouth Tube
RE: Forging Super Duplex Stailess Steel
EEMUA 218 does imply that water quenching is preferred immediately after forging (not air cool) even though the parts are subject to solution treatment and water quenching subsequently.
The reasons are that undesirable intermetallic phases may be present in the structure and may not be removed after the heat treatment.
I was kind of hoping someone had had some experience of how water quenching after forging is actually done in a practical sense.My assumption is that you need a facility similar to a heat treatment quench tank which is temperature controlled and monitored and water is constantly circulating.
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel
From my quite short experience, you don't need the same quenching equipment used for quality heat treatment when you perform water quenching after forging.
It's enough that the quenching bath has enough capacity to rapidly cool the forging, to avoid/limit the presence of intermetallic phases.
Superduplex (type 25Cr) material grades are more critical than Duplex (type 22Cr) material grades.
Superduplex grades have also the problem of carbide nitrides formation.
Attilio Brambilla
//it.linke din.com/pu b/attilio- brambilla/ 25/465/544
Material Engineer
http:
RE: Forging Super Duplex Stailess Steel
Hope this help you to get an idea about how this work!
RE: Forging Super Duplex Stailess Steel
RE: Forging Super Duplex Stailess Steel