METHOD OF MANUFACTURE OF HIGH-STRENGTHEN CORROSIVE-RESISTANT HOT-ROLLED STEEL WITH LOW SPECIFIC WEIGHT Russian patent published in 2017 - IPC C21D8/02 C22C38/00 

FIELD: metallurgy.

SUBSTANCE: blank is prepared from steel containing mass. %: Carbon 0.03-0.07, Silicon 0.5-0.8, Manganese 0.4-0.7, Sulfur no more than 0.01, Phosphorus 0.005-0.015, Aluminium 8.0-11.0, Chromium 6.0-10.0, Nickel 0.005-0.03, Molybdenum 1.01-2.0, Titanium 0.01-0.03, Vanadium 0.05-0.07, Niobium not more than 0.06, Nitrogen 0.005-0.05, Iron and unavoidable impurities are the rest, the sum of [Cr+Al] wt % = 14.1-18, the blank is heated in the range from 1100°C to 1300°C, milling is conducted in at least five stages with a reduction ratio in each step from 10% to 25%, the time between two subsequent milling stages not exceeding 9 s, and the milling end temperature of 810-890°C, then the resulting strip is cooled to ambient temperature.

EFFECT: increasing the strength and corrosion resistance of the strip while maintaining low specific gravity.

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