HOT-MOLDED COMPONENT OF STEEL SHEET AND METHOD OF ITS MANUFACTURE AND STEEL SHEET FOR HOT MOULDING Russian patent published in 2017 - IPC C22C38/06 C22C38/04 C21D9/46 C21D1/18 B21D22/20 

FIELD: metallurgy.

SUBSTANCE: sheet has the following chemical composition, wt %: 0.100 to 0.340 carbon, 0.50 to 2.00 silicon, 1.00 to 3.00 manganese, 0.050 or less phosphorus, 0.0100 or less sulfur, 0.001 to 1.000 soluble aluminium, 0.0100 or less nitrogen, the rest is iron and impurities. The steel structure of the obtained hot-stamped component contains ferrite, at least one of the phases - tempered martensite or tempered bainite, and martensite. The share of the ferrite area is from 5 to 50%, the total share of the tempered martensite and tempered bainite is from 20 to 70%, the share of martensite area is from 25 to 75%, and the total share of the area of the ferrite, tempered martensite, tempered bainite and martensite is 90% or more, and the share of residual austenite is from 0 to 5%.

EFFECT: produced hot-stamped component has a high time resistance, high plasticity and flexibility after hot stamping.

5 cl, 1 dwg, 4 tbl