Charpy vs temperature data
Charpy vs temperature data
(OP)
Does anybody have a curve or data of Charpy impact values vs temperature (-50C TO 150C) for typical pressure vessel low alloy steels such as SA53, SA106B, SA216, SA516,SA105?
Thanks for your help
Thanks for your help





RE: Charpy vs temperature data
This type of data is not readily available, especially for free. However, I can give you some advice to ball park the data. There is a graph which is commonly referred to as CVN impact energy transition curves versus carbon content, and is referenced in many technical publications.
The graph is a compilation of transtion curves for various plain carbon steels as a function of carbon content that varies from 0.1% up to 0.80%.
For pressure vessel steels, the carbon content is less than 0.35%. So, if you locate this graph below and obtain the carbon contents for each of the carbon steels you listed above, you should be able to guesstimate the CVN upper to lower shelf energy values, and transition temperatures.
http://i15.tinypic.com/3z7nygo.jpg[/IMG]
Keep in mind that for SA 516 steel, the CVN transition data would be closer to a lower carbon steel because of the fine grain heat treatment. However, using this graph will allow you to obtain worst case or more conservative data.
RE: Charpy vs temperature data
RE: Charpy vs temperature data
You should realize that there is no direct correlation of Charpy V-notch impact energy values to fracture toughness. The equations in literature relating CVN to KIc are only used to approximate fracture toughness (KIc), at the upper shelf region of the CVN curve.
If you intend to use these equations, be very careful in their application. I would not rely totally on them as part of a risk-based inspection program for deciding to run or repair.
RE: Charpy vs temperature data
As metengr states, you cannot directly correlate charpy values with fracture toughness.
RE: Charpy vs temperature data
thread330-128281
Maui
RE: Charpy vs temperature data
Thank you for the reference, I also found a correlation in API 579 between Kic and Charpy - however I shall act with caution as proposed by Metengr.
I do not understand why data on both these parameters are not more widely published.
IRX
RE: Charpy vs temperature data
Maui