EN is 'European standard' or 'Euronorm'. It has replaced the term BS (i.e, British Standard). ... The first two words in the En steels name is the European steel standard, After that the number is the standard number.
Billet refers to a cast semi finished product. A billet is typically cast to a rectangular, hexagonal or round cross section compatible with secondary processing, e.g. forging. It can be produced either as coil or cut lengths.
Grades as per the International Standards such as DIN / ASTM etc. are:
Alloy Steel (AS)
Mid Steel (MS)
Carbon Steel (CS)
Spring Steel (SS)
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