8x3
Temperature of critical points: Ac 1 = 785, Ac 3 (Ac m) = 830, Ar 3 (Arc m) = 770, Ar 1 = 750, Mn = 370. Hardness after annealing (GOST 5950−2000): HB 10 -1 = 241 MPa. Substitute 7Х3 .
tools (punches, matrices) hot landing fasteners and pieces of carbon and low-alloy structural steels on horizontal forging machines, dies parts (matrices, punches, ejectors) for hot pressing and extrusion, bending and grooved stamps