HIGH-STRENGTH AIR-QUENCHED MULTIPHASE STEEL, HAVING EXCELLENT PROCESS CHARACTERISTICS, AND METHOD OF MAKING STRIPS OF SAID STEEL Russian patent published in 2019 - IPC C22C38/02 C22C38/04 C22C38/26 C22C38/28 C22C38/32 C22C38/38 C21D8/02 C21D9/46 

FIELD: metallurgy.

SUBSTANCE: invention relates to methods of producing cold-rolled or hot-rolled steel strip from high-strength, air-hardening, multiphase steel, wherein total content of (Mn + Si + Cr) in steel is controlled in accordance with obtained strip thickness: up to 1.00 mm sum (Mn + Si + Cr) ≥ 2.350 and ≤ 2.500 wt. %; more than 1.00 and up to 2.00 mm sum (Mn + Si + Cr) > 2.500 and ≤ 2.950 wt. %, and more than 2.00 mm, sum (Mn + Si + Cr) > 2.950 and ≤ 3.250 wt. %.

EFFECT: technical result consists in obtaining a steel strip of different thickness with high technological characteristics.

32 cl, 6 dwg, 1 ex