STEEL SHEET WITH GALVANIC COATING FOR HOT FORGING, HOT FORGING PART AND METHOD OF ITS MANUFACTURE Russian patent published in 2023 - IPC C22C38/14 C22C38/06 C22C38/04 C22C38/02 C21D8/02 B21D22/00 

FIELD: metallurgy.

SUBSTANCE: invention is related to galvanized steel sheet for hot stamping used in the automotive industry. The galvanized steel sheet includes a base steel sheet and a hot-dip and annealed galvanized plating layer or a hot-dip galvanized plating layer on at least one surface thereof. The steel sheet comprises, wt.%: C: 0.005 to 0.14, Si: 1.0 to 1.7, Mn: 1.5 to 3.0, Ti: 0.010 to 0.100, B: 0.0010 to 0.0100, Al : 0.01 to 0.10, P: 0.10 or less (not including 0), S: 0.010 or less (not including 0), N: 0.010 or less (not including 0), optionally one or more elements selected from the group consisting of Cr: 0.5 or less (not including 0) and Mo: 0.5 or less (not including 0), the rest is iron and unavoidable impurities. The amount of solid solution B in the sheet is 10 ppm or more.

EFFECT: galvanized steel sheet has a high resistance to liquid metal embrittlement without reducing the silicon content, regardless of the composition of the coating layer or hot stamping modes.

5 cl, 2 tbl