DBTT temperatures for CRES
DBTT temperatures for CRES
(OP)
I'm a non-metals guy (Plastics, composites) in a metals world. We are supplying parts to a new aerospace program and need to ensure the metals we are using are above a certain DBTT. Is there a place where I can look these up? Thanks.





RE: DBTT temperatures for CRES
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.
RE: DBTT temperatures for CRES
RE: DBTT temperatures for CRES
If it is martensitic or ferritic then there is one.
Give us an alloy or a spec.
You can find them in alloy data sheets from various mills.
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Plymouth Tube
RE: DBTT temperatures for CRES
RE: DBTT temperatures for CRES
RE: DBTT temperatures for CRES
I would be concerned with anything below 32F for high strength condition (H900 or 950) while lower strength (H1050 or 1100) might be OK down to 10F.
Those temperatures should be about a 50% reduction in impact toughness.
Find out what your design limits are.
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Plymouth Tube
RE: DBTT temperatures for CRES
RE: DBTT temperatures for CRES
RE: DBTT temperatures for CRES
Corrosion is part of the issue, but I can figure out a way around that; i.e. use of sealants or coatings to mitigate. The customer wants the DBTT values. Is there a way to go back to the customer and ask them to reconsider? Or is there a polite way to say DBTT is little value and this is what you're really looking for?
RE: DBTT temperatures for CRES
The DBTT is only of value for your initial selection of material. It tells you the minimum temperature that the material will fail in a ductile mode. Like Metengr says, “austenitic stainless steel or nickel-containing low alloy steel grades” are your choices.
You can report to your customer the DBTT for the alloys from this group which you have available. Tell them, “These are the alloys which we have available that have a low enough DBTT for your application and ask them,” what is the minimum CVN energy required at -70F? We want to verify that the material will have the quantified level of ductility (in foot-pounds) necessary for your application”
Design for RELIABILITY, manufacturability, and maintainability
RE: DBTT temperatures for CRES
Aaron Tanzer
www.lehightesting.com
RE: DBTT temperatures for CRES
RE: DBTT temperatures for CRES
you can get about 1/2 of RT toughness at -40.
If you care use only the VAR remelted material.
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Plymouth Tube
RE: DBTT temperatures for CRES
RE: DBTT temperatures for CRES