CSN EN ISO 4885 This document defines important terms used in the heat treatment of ferrous materials. NOTE: The term ferrous materials include products and workpieces of steel and cast iron. Annex A provides an alphabetical list of terms defined in this document, as well as their equivalents in French, German, Chinese and Japanese. Table 1 shows the various iron-carbon (Fe-C) phases. Original English text of CSN EN Standard. The price of the Standard included all amendments and correcturs.