Cast iron specification BS1452 Grade 250 is supplied as continuous cast grey iron bar in rounds and flats. With its fine grain structure this grade can be machined to achieve a good polished surface finish suitable for copper or chromium plating. As a continuous cast iron bar it has a fine grain structure combined with the fine graphite flake size and dense homogeneous structure. BS1452 Grade 250 supersedes specification BS1452 Grade 17.