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Ductile to Brittle Transition Temperature (DBTT) 5

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MikeRCS

Mechanical
Joined
Aug 14, 2008
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US
I am trying to find a list or some info on the DBTT for various metals. Particularly 316 and 17-4 Stainless Steels. These are used in a pressure containing tool that we manufacture and a customer would like to use them in an very cold environment. The tool is rated to withstand 6000 psi and I want to be sure that at a very cold temp it will still have the ductility hold this pressure.
 
There is no DBTT for 316 stainless. For 17-4 this is a martensitic precipitation hardening ss and does have a DBTT. For hardened material, I would not recommend use below -30 deg F.
 
As metengr noted, Type 316 (austenitic stainless steel) does not have a DBTT. It is frequently specified and used for cryogenic applications, meaning below - 150 C. What do you mean by "very cold temp"?
 
Thank you very much for your input. The tool is going to be used outdoors in Alaska where temps can reach -50°F. However I doubt if the tool will see this temperature as it will be kept in a vehicle until used and the fluid pressurizing it internally will be much warmer.

Does anyone know if 4130 steel has a DBTT?
 
4130 sure has a DBTT, and it will depend on the heat treatment condition. You can easily run a series of Charpy tests to find out the DBTT.
 
any ferritic or maternsitic steel will have a DBTT. This includes stainless grades, even the duplex. Austenitic alloys do not.

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Plymouth Tube
 
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