METHOD OF CANDIES MANUFACTURING Russian patent published in 2009 - IPC C21D8/02 C22C38/40 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field, particularly it relates to rolling production and can be used for receiving of candies of strength class X65-X70 used while constructioning of electric-welded oil-trunk pipelines. For technical result achieving it is implemented heating of slabs till the austenitic temperature multipass rough and finish rolling, with finish rolling is started at the temperature 970°C, and finishing temperature is hold equal 785-835°C and then candies are cooled by water till 540-570°C. Furthermore, steel allows following chemical composition, wt %: 0.09-0.12 C, 0.15-0.35 Si, 1.20-1.50 Mn, 0.20-0.50 Al, 0.01-0.05 V, 0.02-0.06 Nb, 0.01-0.03 Ti, not more than 0.20 Cr, not more than 0.20 Ni, not more than 0.20 Cu, not more than 0.015 P, not more than 0.004 S, not more than 0.010 N, not more than 0.006 Ca, the rest is Fe, with observance of ratio N+Vb+Ti≤0.12%.

EFFECT: hardening, increasing of plasticity and impact elasticity and also cost saving for manufacturing.

2 cl, 1 ex, 3 tbl