Inclusion Rating iaw ASTM E45

Dear All
I am going to run into some trouble because of interpretion differences of the ASTM E45. My understanding is, that the visual appearance of inclusions using 100x
magnification is relevant for classification A - D . Others however, insist upon that any knowledge about the nature of the inlusions must be taken into account.
For example: at 100x magnification inlusions can be classified to D according to their visual appearance (round and dark); at 500x they look like sulfides (grey and longish). I know that the material has sulfides. The acceptance limit is A thin 1 and D thin 1.5.
Is it a must to use higher magnifications to resolve inclusion types?
R. Dicken
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Although not a specialist in this topic, I understand from the ASTM description leaflet that the depth of needed investigation depends on the end use of the steel. The differences in interpretation you are alluding to are probably due to differences in liability (e.g. chirurgical steels...).
If you fear a forthcoming or even remotely possible legal problem, I think that you should take advice from a legally acceptable consultant (I am not!).
J.J.
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