METHOD OF MANUFACTURE OF INSTRUMENTAL HIGH-STRENGTH FLATS Russian patent published in 2017 - IPC C21D8/02 C22C38/54 C21D9/42 

FIELD: metallurgy.

SUBSTANCE: method involves making of steel containing the following components, wt %: 0.20-0.38 C, 0.20-1.10 Si, 0.50-1.00 Mn, 0.50-1.45 Cr, 0.70-1.30 Ni, 0.20-0.80 Mo, 0.02- 0.16 V, 0.02-0.08 Al, 0.001-0.010 N, not more than 0.25 Cu, 0.001-0.030 Nb, 0.001-0.020 Ti not more than 0.008 S, not more than 0.013 P, the rest is Fe, production of continuous-cast slab, its hot deformation, water hardening at a temperature of 930-980°C, tempering at a temperature of 575±25°C. In order to increase the hardening capability, boron (0.001-0.005, is added to the steel composition wt %).

EFFECT: providing high strength properties and hardness while maintaining sufficient plasticity and toughness.

2 cl, 4 tbl