STEEL PLATE FOR FABRICATION OF LIGHT WEIGHT CONSTRUCTIONS AND PROCEDURE FOR PRODUCTION OF THIS PLATE Russian patent published in 2011 - IPC C22C38/58 C22C38/38 C22C38/14 B21B1/00 C21C7/00 

FIELD: metallurgy.

SUBSTANCE: there is melted steel containing 0.010 ≤ C ≤ 0.20, 0.06 ≤ Mn ≤ 3, Si ≤ 1.5, 0.005 ≤ Al ≤ 1.5, S ≤ 0.030, P ≤ 0.040, 2.5 ≤ Ti ≤ 7.2, (0.45×Ti) - 0.35 ≤ B ≤ (0.45×Ti) + 0.70, not necessary one or more elements chosen from Ni ≤ 1, Mo ≤ 1, Cr ≤ 3, Nb ≤ 0.1, V ≤ 0.1, iron and unavoidable impurities - the rest. Steel is cast into semi-product at temperature exceeding temperature of liquidus of said steel not more than at 40°C and is hardened. Semi-finished product is heated at temperature and duration which facilitate density of eutectic extractions of TiB₂ and, possible, Fe₂B with maximal size L_max over 15 mcm and with ratio of width to thickness f>5 less 400 mm^-2. Semi-finished product is hot rolled and the plate is produced. The plate is welded or at least one blank is cut out from it and deformed at a temperature range from 20 to 900°C, and a part is fabricated.

EFFECT: upgraded level of working characteristics due to reduced weight and raised modulus of elasticity.

32 cl, 7 dwg, 6 tbl, 5 ex