METHOD OF MANUFACTURING DETAILS BY STEEL BILLET HOT DEFORMATION Russian patent published in 2018 - IPC C21D1/34 C22C38/04 C22C38/58 C22C38/54 C22C38/38 C22C38/32 C21D1/673 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to a method for manufacturing a part having a bainite microstructure with a minimum tensile strength of 800 MPa and used in the automotive industry. Method includes heating at least a portion of the steel billet to a hot deformation temperature and deformation thereof. Billet is made of steel having a microstructure containing at least 50 % bainite, and heating at least a portion of the billet is carried out to a temperature below the transformation temperature of Ac₁. Billet is made of steel, having the following composition, mass. %: C: 0.02–0.3; Si: 0.01–0.5; Mn: 1.0–3.0; P: max. 0.02; S: max. 0.01; N: max. 0.01; Al: up to 0.1; Cu: up to 0.2; Cr: up to 3.0; Ni: up to 0.2; Mo: up to 0.2; Ti: up to 0.2; V: up to 0.2; Nb: up to 0.1; B: up to 0.01; Fe is rest.

EFFECT: required mechanical properties are ensured.

15 cl, 2 tbl