Ductile to Brittle Transition Temperature (DBTT) 5

[MikeRCS]

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.

 

[metengr]

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.

 

[TVP]

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"?

 

[MikeRCS]

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?

 

[salmon2]

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.

 

[EdStainless]

any ferritic or maternsitic steel will have a DBTT. This includes stainless grades, even the duplex. Austenitic alloys do not.

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