Thanks to Dave Suponski, and published in the Summer 2014 Parker Pages, we know Titanic, post-WWI Vulcan, and Trojan steel were essentially the same; AISI 1030 and 1035 Medium Carbon steels. Titanic did have low levels of both nickel and chromium compared to the others, but it would not be an “alloy steel”. Tensile strength testing was not performed on Dave's samples for comparison.
Pre-WWI Vulcan was AISI 1015. Many pre-WWI U.S. maker's tubes were AISI 1020.
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