The invention relates to ferrous metallurgy, and specifically to the production of high-strength steel for manufacturing hot-rolled automobile components. Steel of the following composition is proposed: 0.15-0.20% by mass of carbon; 1.3-1.5% by mass of manganese; 0.05-0.45% by mass of silicon; a maximum of 0.02% by mass of phosphorus; 0.02-0.05% by mass of sulphur; a maximum of 0.25% by mass of copper; 0.03-0.055% by mass of vanadium; 0.004-0.015% by mass of nitrogen, with the remainder being iron and impurities. The technical result of the invention is the production of a hot-rolled product with an increased yield limit, with an increased index of plasticity, good weldability, increased workability, reduced susceptibility to mechanical ageing, possibility of use at temperatures below 0̊C, possibility of excluding additional thermal processing, with a range of strength being maintained and with economical expedience in use in view of employing readily available alloying elements.
展开▼
