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Up Topic Welding Industry / Technical Discussions / impact test temperature
- - By carlos_correia (*) Date 02-25-2011 02:26
which should be the charpy test temperature under asme VIII Div 1?
Parent - - By 99205 (***) Date 02-25-2011 04:11
I think you need to supply more information to get a appropriate answer.
Parent - By jon20013 (*****) Date 02-25-2011 06:40
lowest design temperature of your system / component.
Parent - - By js55 (*****) Date 02-25-2011 13:47
That information is to be dictated by the owner. MDMT. Minimum Design Metal Temperature.
Parent - By G.S.Crisi (****) Date 02-26-2011 00:18
Let's put together jon's and js' answers:
The lowest design temperature of your system/component, that shall be stated by the owner or his consulting engineer.
Giovanni S. Crisi
Sao Paulo - Brazil
Parent - - By RonG (****) Date 02-26-2011 01:57
If your product is headed for the North sea it should be around -60F :-(.
Parent - - By Skaggydog (**) Date 02-28-2011 20:20
It wasn't in 1912.
Parent - - By RonG (****) Date 02-28-2011 20:42
And you would know this ......how? At -60F who cares what the date is. Did they even do Charpy impact test back then? How ever back in 1998 we had to qualify at -60F with 7018 electrode. Didn't work.
Parent - By js55 (*****) Date 02-28-2011 22:04
In answer to your question about charpy testing history. No. They didn't do it back then. They did not even imagine such a property to be problematic until ship hulls started cracking (some catastrophically)from north atlantic temps during WWII.
ASTM has an excellent STP on the subject if they still have it available.
Parent - By G.S.Crisi (****) Date 03-01-2011 21:20
We can assume that in the 1912 Titanic wreckage the sea water temperature wasn't 60ºF or 15ºC, because there were icebergs floating around. Icebergs would quickly melt down at a water temperature of 60ºF.
A few years ago I read an article on a magazine whose name I don't remember. The article said that a piece of the Titanic's hull plate was cut and took to a lab to analyze it. The chemical analysis revealed that the steel could be considered as being SAE 1020. Mechanical tests were also run, but they weren't considered valid because the long time under sea could have changed the mechanical properties of the steel.
Giovanni S. Crisi
Up Topic Welding Industry / Technical Discussions / impact test temperature

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