ANS:B - 18

The maximum percentage of chromium that can be added to steel depends on several factors including the type of steel and its intended application. In general, stainless steels, which are alloys containing chromium, typically have chromium content ranging from around 10% to 30%. However, there are specialized alloy steels where chromium content can be even higher, reaching up to 30% or more. Therefore, it is difficult to specify a single maximum percentage of chromium for all types of steel.