Explanatory notes
… (e.g., blooms, billets, rounds, slabs, sheet bars, pieces roughly shaped by forging), flat‑rolled products, whether or … very small quantities of boron (0.0008 % or more by weight) or of niobium (0.06 % or more by weight). (3) Alloy … alloy steels resistant to shock and abrasion, having a high manganese content. (9) High speed steels : alloy …