HIGH-STRENGTH STEEL SHEET AND METHOD OF MAKING SAME Russian patent published in 2016 - IPC C21D8/02 C21D9/46 C22C38/14 

FIELD: metallurgy.

SUBSTANCE: high strength steel plate has chemical composition in wt%: C is more than 0.0005 and less than 0.10, Si is 1.5 or less, Mn is 0.1 or more and 3.0 or less, P is 0.080 or less, S 0.03 or less, sol. Al is 0.01-0.50, Ν is 0.005 or less, at least one element selected from Nb 0.20 or less and Ti 0.20 or less, Fe and incidental impurities, in which microstructure contains at least 60 % of volume fraction of ferrite phase, and under condition that distribution function 3D orientation of crystals orientation distribution function ODF presented {ϕ1, Φ, ϕ2}, ODF intensity {0°, 0°, 45°} at Φ = 0°, ϕ1 = 0° and ϕ2 = 45° is 3.0 or less; and ODF intensity {0°, 35°, 45°} at Φ = 35°, ϕ1 = 0° and ϕ2 = 45° makes 2.5-4.5.

EFFECT: creation of high-strength steel sheet with relatively small planar anisotropy plasticity and exhibiting fracture strength at forging.

3 cl, 2 tbl, 3 dwg