Steels are identified by four numbers, except for some chromium steels, which have five numbers.

Name: Steels are identified by four numbers, except for some chromium steels, which have five numbers.
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Steels are typically identified by four numbers, known as the AISI (American Iron and Steel Institute) numbering system. However, some chromium steels may have an additional digit or letter added to the four-digit number to indicate specific alloying elements, making them five-digit numbers.

Steels Are Identified by Four Numbers, Except for Some Chromium