One more chime, some of the higher grades (and costly) may have very similar chemistry though the tolerances for each element will be held to a much tighter spec, that in turn compliments properties and consistency for the customer. What I suspect for example is a Vulcan steel barrel to have a wider range of Cr. (probably at the low end ) and Titanic to be held more at the spec # for its grade of steel. Probably the same grade of steel but the costly elements at the low range of the spec. The early 1900's also saw the open hearth overtake the Bessemer converter giving a much needed control to tighter chemistry in mass produced steel.
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