NITRIDING METHOD OF STEEL Russian patent published in 2010 - IPC C21C7/72

Abstract RU 2380431 C1

FIELD: metallurgy.

SUBSTANCE: method includes vacuumizing of steel in ladle with simultaneous blowing off by inert gas through bottom porous tuyeres under high-basic slag. Blowing off in ladle at vacuumising is implemented through bottom porous tuyeres by nitrogen with intensity 3-25 m³/h and consumption 0.02-0.35 m³/t of steel. Oxidation of slag not more than 1.2% FeO and ratio CaO/ SiO₂ 2.1-2.8, herewith height of slag in ladle is provided equal to 80-150 mm.

EFFECT: usage of invention provides reduction of expenditures at nitriding of steel, reduction of oxygen concentration in steel and pollution level by nonmetallic inclusions, increasing of impact elasticity at negative temperatures.

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RU 2 380 431 C1

Authors

Jur'Ev Aleksej Borisovich

Godik Leonid Aleksandrovich

Kozyrev Nikolaj Anatol'Evich

Dates

2010-01-27—Published

2008-08-25—Filed