METHOD OF HOT-ROLLED SHEET MANUFACTURING Russian patent published in 2008 - IPC C21D8/02 B21B1/26 

FIELD: metallurgy.

SUBSTANCE: method includes slab heating, its further multipass bidirectional rough and finish rolling with regulated finishing temperature, at that finish rolling is begun at temperature 970-1050°C and finished at finishing temperature from 940°C till 990°C with percent reduction in final run 7-15%. Slab is received from steel, containing, wt %: C=0.18-0.23; Si=0.15-0.40; Mn=1.0-1.35; V=0.02-0.04; Al=0.02-0.05; Cr≤0.3; Ni≤0.3; Cu≤0.3; S≤0.020; P≤0.020; N≤0.012; Fe - the rest. Finishing temperature at sheet thickness 6.0-16.0 mm is equal 940°C, at sheet thickness 16.1-25.0 mm - 950°C, at sheet thickness 25.1-40.0 mm - 980°C, at sheet thickness exceeding 40.0 mm is equal 990°C.

EFFECT: quality increasing of hot-rolled sheet and yield ratio.

5 cl, 7 ex, 3 tbl