X12M
Temperature of critical points: Ac1 = 830, Ac3 (Acm) = 855, Ar1 = 750, Mn = 230. Hardness after annealing: HB 10 -1 = 255 MPa .
for the manufacture of rolling rollers, wire drawing boards and drawing dies, eyelets for calibrating metal; punches and dies punching dies; punches and dies of cold extrusion operated with operating pressures up to 1400−1600 MPa