METHOD FOR STEEL MANUFACTURING, STEEL, AND PRODUCTS MADE FROM THE SAME Russian patent published in 2005 - IPC

FIELD: iron metallurgy, in particular manufacturing of hot-rolled steel and products the same.

SUBSTANCE: method includes matrix steel smelting in steel furnace, containing carbon, manganese, silicium, and iron; tapping into ladle; introducing into bottom zone of ladle mixture for microalloying and deoxidation containing aluminum, calcium, and boron with simultaneous blasting with nitrogen through the bottom jet; and simultaneous complete of mixture introducing and nitrogen blasting; steel casting, and steel ingot producing. Ingot contains (mass %) carbon 0.12-0.42; silicium 0.17-1.10; manganese 0.5-1.8; calcium 0.001-0.02; aluminum 0.02-0.05; aluminum nitride 0.01-0.0.04; boron 0.0001-0.0005; boron nitride 0.001-0.005; nitrogen 0.005-0.012; and balance: iron and inevitable impurities. Ingot is taken out, hot rolled up to desired product dimensions and thermal hardened. Optionally (for example to produce additional rolled product characteristic such as improved tensile strength, ultimate strength, wearing capacity) steel may be additionally doped with chromium, nickel, copper, molybdenum and/or vanadium. Steel of present invention is useful for production of oil pump bars of 15-40 mm in diameter and up to 8.5 m in length.

EFFECT: steel with improved mechanical characteristics.

11 cl, 2 tbl, 1 ex