Actually, the details of historical evidence concerning iron, steel, cricifixion or any other subject, doesn't interest most people..unless trhey are
greatly engaged with history itself.
Just as some exert themselves to study car & trucks, hunting , fishing, oil painting or today's electronic technology..so the person who realizes
that history is our roots, and still explains many of mankind's quirks and decisions, and so, goes on to seek historical information.
"One thing we learn from history, is that we don't learn from history !" (Hegel)
"Those who don't learn from history, are doomed to repeat it !" (Santyana)
..But being a history aficinado, as with any other specialized study, is not for everybody..just as the skills mentioned above., are not for all.
Yes, in early years, steel was made in very small quantities, by hammering in quantities of carbon (often burned leather). Off hand , I know of no
strictly Roman examples..though likely some do exist.
There are excellent examples of "Damascus steel" (pattern welded) in various weapons from the medieval period, such as found in some Viking
swords etc, but the technique of manufacture was lost to history in recent centuries.
Then in the early 1970s, Bill Moran..noted knife maker, rediscovered the process..and pattern welded steel is a rather common material used by
knife smiths of today..
Andrew Carnagie pioneered modern steel making by way of the Bessemer process.. Thus, at about the turn of the 20th century, iron production
yeilded almost completely to steel production..