Scroll down about 2/3 here for Dave Suponski's study which was published in the Summer 2014
Parker Pages
https://docs.google.com/document/d/1...EK8OtPYVA/edit
Titanic, post-WWI Vulcan, and Trojan were essentially the same; AISI 1030 and 1035 Medium Carbon steels. Titanic had low levels of both nickel and chromium compared to the others.