Imiyoboro y'icyuma idafite intego kubikorwa byubaka, ibyuma bitagira ibyuma byubatswe muriGB / 8162-2008Bisanzwe. ibikoresho birimo ibyuma byujuje ubuziranenge bya karubone hamwe nicyuma gike cyane, nka 10,20,35,45 na Q345, Q460, Q490,42CrMo, 35CrMo.