METHOD OF PRODUCTION OF STEEL HOT ROLLED STRIPS Russian patent published in 2009 - IPC C21D8/02 C22C38/20 

FIELD: metallurgy.

SUBSTANCE: for production of welded tubes and metal structures method consists in heating slabs, in hot rolling strips with regulated temperature of rolling finish, in cooling with water to temperature of winding and in winding into coils; also steel has following chemical composition, wt %: 0.02-0.10 C, 0.15-0.50 Mn, 0.02-0.05 Al, not more 0.05 Si, not more 0.20 Cr, not more 0.15 Ni, not more 0.20 Cu, not more 0.020 S, not more 0.020 P, not more 0.012 N, Fe - the rest. Temperature of winding T_wnd of strips is maintained within ranges 600-650°C, while temperature of rolling finish T_RF is set depending on thickness H of a rolled strip: T_RF≥780°C at H=0.80-2.99 and T_RF≥870°C at H≥3.00 mm.

EFFECT: reduced production costs.

2 cl, 4 tbl, 1 ex