anneling vs stabilization heat treatement
anneling vs stabilization heat treatement
(OP)
hi everyone,
Could someone tell me if I will do annealing heat treatment to stainless steel is done also a stabilization? If Yes why in SA-312 stabilization heat treatment is a supplementary requirement?
Extras:“Subsequent to the solution anneal required in 6.2,
Grades TP309HCb, TP310HCb, TP321, TP321H, TP347,
TP347H, TP348, and TP348H shall be given a stabilization
heat treatment at a temperature lower than that used for
the initial solution annealing heat treatment.”
Could someone tell me if I will do annealing heat treatment to stainless steel is done also a stabilization? If Yes why in SA-312 stabilization heat treatment is a supplementary requirement?
Extras:“Subsequent to the solution anneal required in 6.2,
Grades TP309HCb, TP310HCb, TP321, TP321H, TP347,
TP347H, TP348, and TP348H shall be given a stabilization
heat treatment at a temperature lower than that used for
the initial solution annealing heat treatment.”





RE: anneling vs stabilization heat treatement
The reason for being a supplementary requirement is that not all applications require a stabilization treatment.
RE: anneling vs stabilization heat treatement
But my question was: if I do annealing heat treatment is done also a stabilization of the materials?
Stabilization usually is done to 843 to 899°C,and the purpose is dissolve the precipitated chromium carbides.
Annealing heat treatment is done to 928 to 1093°C the primary purpose is to obtain softness and high ductility
What is the difference of these heat treatments? Maybe holding time?
RE: anneling vs stabilization heat treatement
The material will be soft and single phase.
When you stabilize you deliberately form carbides (Ti or Cb) and don't form Cr carbides. This ties up all of the C in the alloy.
This prevents future formation (in service) or Cr carbides and the resulting susceptibility to intergranular corrosion.
If your service is at 850-900C then skip the pre-treatment.
Anything less than 1000C is not an anneal.
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P.E. Metallurgy, Plymouth Tube
RE: anneling vs stabilization heat treatement
RE: anneling vs stabilization heat treatement
If I am reannealing something after cold work that has no carbides then I am looking at a few minutes at temperature.
If I am dissolving carbides then it depends on how coarse they are, anywhere from 10 min to 1.5 hrs.
It also depends on temperature, 1 hr at 1000 is roughly equal to a few min at 1100.
Everything that we make is thinner than 6mm. We anneal most 3xx alloys at 1065 for times from 5 to 10 min.
Stabilization takes a bit of time because the temperatures are lower and reactions and diffusion are slower.
The time will depend on the alloy and composition.
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P.E. Metallurgy, Plymouth Tube
RE: anneling vs stabilization heat treatement
in ASME code stabilization heat treatment is a supplementary requirement
RE: anneling vs stabilization heat treatement
As for doing it to welds, they should have required it be done before the welding, even if they just did it localized. Not there is any real harm in doing it afterwards as the alloys are designed to stabilize when welded. It is just redundant.
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P.E. Metallurgy, Plymouth Tube