Please do not respond with Titanium or Bronze (unless it is a bronze alloy) as i have different uses in mind for these.
Also anything created by laboratory means such as depleted Uranium would not be appropriate. While I can involve a little magic or bending a little of reality, I want to avoid thouroughly modern Alloys unless they could have been made in a medeival forge (potentially).
Sorry if that's confusing... Dealing mostly in theory here anyway.