ROLLED STEEL WHICH HARDENS THROUGH RELEASE OF PARTICLES AFTER HOT FORMING AND/OR TEMPERING IN INSTRUMENT, HAVING VERY HIGH STRENGTH AND DUCTILITY, AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2016 - IPC C22C38/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and can be used for manufacture of structural elements and safety elements of ground vehicles from rolled steel sheet. Rolled sheet steel has following composition, wt %: C ≤ 0.1 %, 0.5 % ≤ Mn ≤ 7 %, 0.5 % < Si ≤ 3.5 %, 0,5 % < Ti ≤ 2 %, 2 % < Ni ≤ 7 %, Al ≤ 0.10 %, Cr ≤ 2 %, Cu ≤ 2, Co ≤ 2 %, Mo ≤ 2 %, S ≤ 0.005 % P ≤ 0.03 %, Nb ≤ 0.1 %, V ≤ 0.1 %, V < 0.005 %, N ≤ 0.008 % iron and inevitable impurities - balance, wherein content of silicon and titanium is Si+Ti ≥ 2.5 %, Ti/Si ≥ 0.3. Vehicle component is made from rolled steel sheet by hot forming. Microstructure element consists substantially of martensite and intermetallic precipitates of type Fe₂TiSi, number of which ranges from 1 to 5 %.

EFFECT: providing improved properties on strength and ductility.

20 cl, 3 dwg, 4 tbl