Whither corrosion?

IS IT NOT surprising that, although it is now over 100 years since Bessemer patented his process for the production of cheap steel, there is still no commercially available low‐alloy steel whose corrosion resistance (except for minor improvements in resistance to some atmospheres) is significantly better than that of the steels available in the mid‐nineteenth century? In fact it would not be impossible to find constructional engineers who consider modern steels not to have as much resistance as those of years ago.