What is EN9 Carbon Steel? 

EN9 carbon steel is a medium carbon steel grade defined by the British Standard BS 970, commonly supplied in the normalized or as-rolled condition. It is characterized by a carbon content between 0.50% and 0.60%, which provides greater strength and hardness compared to mild steel grades like EN3 or EN8, while retaining reasonable ductility and shock resistance. 

Classified as a medium carbon steel, EN9 (equivalent to 070M55 in BS 970:1991) is engineered for applications requiring high wear resistance and surface hardness. The material can be further hardened through flame or induction hardening processes to achieve superior surface durability, making it an excellent choice for components subject to heavy friction or abrasion. 

While it does not possess the high tensile strength of alloy steels like EN19 or EN24, EN9 offers a cost-effective solution for general engineering applications where moderate tensile strength and good machinability are required. It bridges the gap between lower carbon steels and higher alloyed engineering steels, serving as a reliable material for shafts, gears, and cams.