Steel, an alloy of iron and carbon, is both stable and elastic, extremely resistant, and a permanent item in our everyday life. Today there are over 2,500 standard steel types, with new grades and applications emerging all the time. Each steel type is specially made for its purpose. It is subject to stringent quality standards to ensure that it optimally withstands the specific loads. Light microscopic determination of the content of non-metallic inclusions is one of the main metallographic examinations of industrial steel. In July 2007, the new steel inclusion rating standard EN 10247 has been introduced in Europe. Dipl.-Ing. Damian Moll, Head of Metallography of Dillinger Hütte, Dillingen/Saar, Germany, is an acknowledged expert on steel inclusion rating and, since 2002, chairman of the EN 10247 work group of the VDEh steel institute.
Image: Detail from Figure 5: Oxidic inclusions in steel. Courtesy of Dillinger Hütte.