METHOD FOR PRODUCING COATED STEEL PART Russian patent published in 2023 - IPC C21D8/04 B32B15/00 C21D9/48 C21D1/74 C23C2/40 C23C28/00 B82Y30/00 

FIELD: metallurgy.

SUBSTANCE: method for producing a coated steel part. The method includes the following steps: A) providing a steel sheet with an aluminium-based pre-coating for heat treatment; B) applying a 10 to 550 nm thick hydrogen barrier pre-coat that contains at least one element selected from the following: nickel, chromium, magnesium, aluminium, and yttrium; C) annealing the pre-coated steel sheet to obtain an alloy-precoated steel sheet, cooling after batch annealing at a rate of 29.0°C⋅h^-1 or less; D) cutting the said steel sheet to obtain a blank; E) performing heat treatment of the blank at a temperature of 800 to 970°C for 1 to 12 minutes to obtain a fully austenitic microstructure in the steel; F) transferring the blank to the press die; G) performing hot forming of the workpiece at a temperature of 600 to 830°C to obtain a part; H) cooling the part obtained in step G) to form a microstructure in the steel which is martensitic.

EFFECT: manufacture of a part characterized by excellent resistance to delayed fracture.

10 cl, 1 ex, 1 tbl