We need purchase Alloy Steel . I think it is egual 41 Cr 4 KB (Italy norm) or JIS S cr 4H (JAPAN) or ASTM A322 (USA). The chemical composition is: C=0,38~0,45 - Mn=0,60 ~0,90 - Cr= 0,90 ~1,20 - Si= 0,40max - P= 0,035max - S=0,035. Diameter: 15 mm. Purpose: Manufactory screws. Quantity: Two full 20' containers.