SHEET STEEL FOR PRODUCTION OF PARTS SUBJECTED TO HARDENING UNDER PRESSURE, PART SUBJECTED TO TEMPERING UNDER PRESS, CHARACTERIZED BY PRESENCE OF COMBINATION OF HIGH STRENGTH AND PLASTICITY DURING COLLISION DURING ACCIDENT, AND METHODS OF PRODUCTION THEREOF Russian patent published in 2020 - IPC C21D8/02 C22C38/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to sheet steel for production of part subjected to quenching under press characterized by composition containing, wt. %: 0.15 ≤ C ≤ 0.22; 3.5 ≤ Mn < 4.2; 0.001 ≤ Si ≤ 1.5; 0.020 ≤ Al ≤ 0.9; 0.001 ≤ Cr ≤ 1; 0.001 ≤ Mo ≤ 0.3; 0.001 ≤ Ti ≤ 0.040; 0.0003 ≤ B ≤ 0.004; 0.001 ≤ Nb ≤ 0.060; 0.001 ≤ N ≤ 0.009; 0.0005 ≤ S ≤ 0.003; 0.001 ≤ P ≤ 0.020; the microstructure consists of less than 50 % ferrite, from 1 % to 20 % residual austenite, cementite, such that the surface density of cementite particles greater than 60 nm is less than 10⁷/mm²_, an additional component consisting of bainite and/or martensite, wherein the residual austenite is characterized by an average content of Mn of at least 1.1*Mn.

EFFECT: disclosed steel has high ductility with good weldability.

23 cl, 1 dwg, 6 tbl