PROCEDURE FOR SUBMERGED HOT GALVANISING OF STEEL SHEET POSSESSING EXCELLENT PROCESSABILITY, CHIPPING AND SLIPPERINESS Russian patent published in 2010 - IPC C23C2/02 C23C2/06 C23C2/26 C23C28/00 C21D9/46 

FIELD: metallurgy.

SUBSTANCE: according to procedure slab containing wt %: C from 0.01 to 0.12, Mn from 0.05 to 0.6, Si from 0.002 to 0.1, P 0.05 or less, S 0.03 or less, dissolved Al from 0.005 to 0.1, N 0.01 or less, Fe and unavoidable impurities - the rest. The slab is hot-rolled, etched and cold rolled with successive annealing of the sheet at temperature from 650 to 900°C and cooling to temperature from 250 to 450°C. The sheet is conditioned at this temperature during 120 min or more and further it is cooled to room temperature, etched, preliminary coated with Ni or Ni-Fe without intermediate pinch-rolling, heated at rate 5°C/sec or more to temperature from 430 to 500°C, galvanised in a galvanic bath, dried, heated at rate of temperature rise 20°C/sec or higher to temperature from 460 to 550°C without conditioning or with it during less, than 5 sec, cooled at rate 3°C/sec or more and finish pinch-rolled with degree of elongation from 0.4 to 2 %.

EFFECT: improved processability, chipping and slipperiness.

3 cl, 1 dwg, 3 tbl, 2 ex