SU899664A1

SU899664A1 - Method for alloying steel and alloys with nitrogen

Info

Publication number: SU899664A1
Application number: SU752109815A
Authority: SU
Inventors: Вахтанг Михайлович Бережиани; Бекар Михайлович Мирианашвили; Леван Семенович Имнадзе; Ираклий Сергеевич Жордания; Шалва Дмитриевич Джапаридзе; Гурам Бенедиктович Кашакашвили; Гурам Александрович Гогоберидзе
Original assignee: Институт металлургии им.50-летия СССР АН ГССР; Руставский металлургический завод
Priority date: 1975-03-04
Filing date: 1975-03-04
Publication date: 1982-01-23

Description

1one

-Изобретение относитс к металлургии , в частности к способам легировани жидких сталей и сплавов азотом .The invention relates to metallurgy, in particular to methods for doping liquid steels and alloys with nitrogen.

Известен способ легировани жидких сталей и сплавов азотистыми лигатурами хрома, марганца 111.A known method of alloying liquid steels and alloys with nitrogenous ligatures of chromium and manganese 111.

Недостатком способа, вл етс то, что лигатуры нар ду с азотом (2-8%) содержит хром или марганец (70-90%) и при их использовании в жидкую сталь или сплав вместе с азотом вводитс большое количество марганца или хрома . При легировании низколегированных сталей а:зотом, когда содержание в стали хрома или марганца не превышает 0,5%, требуетс добавление незначительного количества этих -лига .тур, что не обеспечивает введени в жидкую сталь необходимого количества азота.The disadvantage of the method is that ligatures, along with nitrogen (2-8%), contain chromium or manganese (70-90%) and when they are used, a large amount of manganese or chromium is introduced into molten steel or alloy together with nitrogen. When doping low-alloyed steels a: with gold, when the content of chromium or manganese in steel does not exceed 0.5%, it is necessary to add a small amount of this alloy, which does not ensure the introduction of the necessary amount of nitrogen into the liquid steel.

В насто щее врем отечественна промышленность почти не производит , азотистую лигатуру марганца, а выпускаема азотиста лигатура хрома может быть применена только при легировании сталей и сплавов, содержащих хром.At present, the domestic industry almost does not produce a nitrogenous ligature of manganese, and the manufactured nitrogenous ligature of chromium can only be used in the alloying of steels and alloys containing chromium.

Наиболее близкой к предлагаемому по технической сущности вл етс способ легировани жащких стали и сплавов в печи смесью, содержащей, вес.%:Closest to the proposed technical essence is a method of doping steel and alloys in a furnace with a mixture containing, in wt.%:

Цианамид каль20-80 ци Cyanamide Cal20-80 qi

Плавиковый Fluoric

10-80 шпат Криолит Остальное10-80 spar Cryolite Else

Смесь вдувают в печь газом-носителем на границу раздела металлшлак . Газом-носителем служит либо азот, либо какой-нибудь инертный газ 21.The mixture is blown into the furnace by a carrier gas at the metal-slag interface. The carrier gas is either nitrogen or inert gas 21.

Claims

The disadvantages of the method are that the rate of nitrogen absorption by the metal is relatively low. 3 The injection of the nitriding mixture in the furnace requires a change in the welding technology and increases the duration of the melting process. The aim of the invention is to increase the rate of nitrogen absorption by the metal. This goal is achieved by the fact that according to the method of alloying steel and alloys with nitrogen, which involves introducing the nitriding mixture into the liquid metal, the nitriding mixture is introduced into the ladle 20-150 seconds after the start of the metal release. The proposed method does not require a change in the existing smelting technology, does not increase the duration of smelting, and increases the absorption rate of nitrogen up to 60%. In this way, steel and alloys can be alloyed with nitrogen in ladles with a capacity of from 5 to 500 tons. The alloying nitriding steel is introduced into the ladle from 5 to 50 tons in 20-60 seconds after the start of production, and in buckets with a capacity of more than 50 tons - in 60-150 seconds. The method is applicable for the alloying of steel and alloys of any chemical composition, does not require a change in the existing technology of smelting metal, and making new additional installations. Claims A method for alloying steel and alloys with nitrogen, including introducing a nitriding mixture into a liquid metal, characterized in that, in order to increase the nitrogen absorption rate, the nitriding mixture is introduced into the ladle in 20-150 seconds after the start of production of the metal. Sources of information taken into account in the examination 1. Japanese Patent No. 15501, cl. 10 A. 32, 1964.

2. USSR author's certificate number 276430, cl. C 22 C 35/00, 1967.