COLD-ROLLED STEEL PLATE WITH EXCELLENT RESISTANCE TO AGEING, AND ITS MANUFACTURING METHOD Russian patent published in 2015 - IPC C21D8/02 C21D9/46 C22C38/14 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy. To ensure elongation corresponding to the yield strength in steel the cold-rolled steel plate is manufactured with increased resistance to ageing, the cold-rolled steel plate is manufactured with the following composition in wt %: C 0.01-0.05, Si 0.2 or less, Mn 0.5 or less, P 0.03 or less, S 0.02 or less, N 0.01 or less, Al 0.01-0.1, Fe and inevitable impurities are the rest; with that, content of the dissolved carbon is 10 ppm or less, content of the dissolved aluminium is 50 ppm or less, and at least 40% of cementite extractions is present at intergranular boundaries of ferrite.

EFFECT: improvement of characteristics.

7 cl, 2 tbl