EN24 steel is also known as 817M40. It is an equivalent to SAE (AISI) 4340 and 34CrNiMo6, Werkstoff No.1.6582. EN24 steel is our most popular and versatile grade of through-hardening alloy steel. It is readily machinable in the "T" condition, available in black or bright finish, as round, square and flat bar, supplied in bar lengths or cut blanks. EN24 steel is suitable for the manufacture of gears, shafts and other components. It is commonly specified where good tensile and impact properties are important.