Charpy references

R

Ravaillac

Joined
Feb 14, 2005
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1,650
Where can you find charpy data for the most common steels?

Crucible and a few other makers have some listed on their website, but not for all their steels, and some appear a bit odd.

So far I've not been able to find charpy charts for many steel, particularly the most common ones (while makers are generally eager to promote their last steel of the month, with more or less honest datas).

I know people in industry probably have those. For steel like 1070, 1080, these might even have felt in public domain, so why seem it so complicated to find those ?
 
Look in the ASM standard reference books for materials information on steels. Carpenter has a much more complete materials book than Crucible and gives multiple impact toughness tests over a range of tempers.

-Cliff
 
I've had a look at carpenter stuff. It's interesting but it is also full of "holes":

All datas are not available for all steels (eg: impact isn't available for S7, impact test is Izod rather than charpy, only alloyed steel...).
One funny thing is that their izod tests also seem unconsistent with some of the charpy I've seen.
 
Yes, none of the sources I have seen have the full wealth of data on every steel. You will have to compile the data from many sources.

-Cliff
 
Yes, that's what I've had realised, but it's a bit weird, since it's no rocket science, and manufacturers probably have those.
Wouldn't a knife manufacturer make some of those public, at least for old stuff (recent stuff would probably be more controversial), could be good publicity ?

Anyway I've also noted that Izod to HRC curve for A2 at carpenter doesn't seem consistent to
charpy to HRC for A2 figures at crucible

Carpenter's results are linear
while
Crucible are sort of a "camel back" curve (peaks around 60, and 55)
* has far as I know the Crucible result was corroborated by another curve I found (but can't find back, sorry).
 
Facts prevent hype and far too much of the industry sells on hype. Only a few manufacturers like Spyderco release actual testing data and others like Busse do live demonstrations.

Note that the curves are often interpolated. THere are few dots and then curves are drawn. If you consider the precision of the readings then you can miss maxima easily especially if you only do one test run to record readings.

-Cliff
 
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