COLD-ROLLED STEEL PLATE WITH EXCELLENT FORMABILITY AND ITS MANUFACTURING METHOD Russian patent published in 2014 - IPC C21D8/02 C21D9/46 C22C38/14 C23C28/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy. In order to achieve the technical result, a plate is made from steel containing the following components, wt %: C 0.010 to 0.035 (excluding 0.010%), Si 0.1 or less, Mn 0.35 or less, P 0.035 or less, S 0.02 or less, N 0.0060 or less, Al 0.005 to 0.1, Fe and inevitable impurities are the rest provided that [% Mn]/[% Al]<20, where [% M] represents content (wt %) in steel of element M, with that, diameter of ferrite grain in steel does not exceed 5 mcm, and at least 50% of separated cementite is within boundaries of ferrite grains.

EFFECT: production of a cold-rolled steel plate with stable increased formability.

9 cl, 2 tbl, 1 ex