SU986939A1

SU986939A1 - Method for refining steel and alloys

Info

Publication number: SU986939A1
Application number: SU813340557A
Authority: SU
Inventors: Виктор Тихонович Якубов; Олег Николаевич Крепышев; Василий Александрович Корнилов
Original assignee: Предприятие П/Я Р-6762
Priority date: 1981-09-25
Filing date: 1981-09-25
Publication date: 1983-01-07

Description

(54) СПОСОБ РАФИНИРСЖАНИЯ СТАЛИ И СПЛАВОВ(54) METHOD OF REFINING STEEL AND ALLOYS

1one

Изобретение относитс к металлургии и может быть использовано дл получени стали с низким содержанием вредных примесей , иеметаллйческих включений и гаэ(ж.The invention relates to metallurgy and can be used to produce steel with a low content of harmful impurities, and metal inclusions and gae (g.

Известен способ разливки стали, при , котором мета:пл в процессе разливки про- пускают через огнеупорный фильтр, разогретый до 120О - 140Cf С L l .There is a known method of steel casting, in which meta: PL in the process of casting is passed through a refractory filter, heated to 120О - 140Cf С L l.

.Недостатком известного способа вл етс , то что ои позвол ет удал ть из ста-, ц ли только крупные и средние неметаллические включени (более 10О мк), но не может обеспечить удаление более мелких неметаллических включений, а также качественную очистку металла от таких вред- ,5 ных примесей, как фосфор, сера, мышь к, сурьма, висмут и др.The disadvantage of this method is that it only allows removing large and medium non-metallic inclusions (more than 10 O microns) from the stack, but cannot ensure the removal of smaller non-metallic inclusions, as well as high-quality cleaning of the metal from such harm. -, 5 solid impurities, such as phosphorus, sulfur, mouse, antimony, bismuth, etc.

Известно, что при обработке нержава- к цей стали шлаком состава 90% Caf х и 10% Са содержание фосфора снихсаетс 20 с 0,ОЗ до 0,01% 2 .It is known that when stainless steel is treated with steel slag with a composition of 90% Caf x and 10% Ca, the phosphorus content drops to 20 s 0, OZ to 0.01% 2.

Наиболее близким по технической сущности и достигаемому результату к изобретению вл етс способ рафинировани The closest in technical essence and the achieved result to the invention is the method of refining

стали и сплавов, включак ций фильтрование металла ЗЗ .steel and alloys, including filtering metal ZZ.

Недостатком известных способов вл етс , то, что активный шлакометаллнческий расплав, состо щий из дорогосто щих компонеитсш, используетс неэффективно, так как значительна его часть идет на взаимодействие с крупными неметаллическими включени ми.A disadvantage of the known methods is that the active slag metal melt, consisting of expensive components, is used inefficiently, since a significant part of it is used to interact with large non-metallic inclusions.

Цель изобретени - повышение качест ва металла и уменьшение расхода шлакометаллической смеси.The purpose of the invention is to increase the quality of the metal and reduce the consumption of slag-metal mixture.

Указанна цель достигаетс тем, Что в известном способе ра({ 1нировани стали и сплавов, включающем фильтрование металла , согласно изобретению, металл после ({ шьтрсюани пропускают через слой активного шлако-металлического расплава.This goal is achieved by the fact that in a known method ({1 stabilizing steel and alloys, including filtering the metal according to the invention), the metal after ({passing the metal is passed through a layer of active slag-metal melt.

Рафинирование металла осуществл ют в вакууме или нейтральной атмос((ере.Metal refining is carried out in vacuum or neutral atmosphere ((ere.

Claims

At the same time, affective sorption-ion cleaning of a liquid metal from non-metallic inclusions in npouer.ee is performed (it passes through the filter, and then from harmful impurities and gases when the research institute drops metal through the layer of active sludge-metal melt. harmful non-ferrous impurities, and the transmission of metal droplets containing non-metallic inclusions does not allow it to be completely cleaned of non-metallic inclusions. As a result, the combination of 4m1 with refining tal in the slag-metal melt layer, the metal is obtained more purely than in each refining method separately. Moreover, this method significantly reduces the consumption of expensive active slag-metal mixture (from 15-20% to 7-10% by weight of metal The method also involves filtering, refining in vacuum or in an inert atmosphere (argon). The method is carried out as follows. In a deep refining unit, 10 kg of 38KHNMFA steel containing harmful impurities are processed,%: phosphorus 0 , 040, sulfur 0.035, bismuth 0.024. To do this, the components of the refining scrap are loaded into the working space of the installation chamber in an amount of 10% of the weight of the steel being processed. The composition of the refining slag is as follows,%: CaF. 9О, 10. In addition, metallic lithium and calcium in the amount of 5 and 10%, respectively, of the total weight of the refining slag, are added to the slag components. In this case, lithium is introduced for the best one in a cassette made of steel, which has undergone treatment. Above the layer of the charge have a filter of magnesia crumbs fraction of 5-10 mm, thick with a thickness of 25 mm. Then the chamber is closed with krpika and a funnel is installed. After that, a vacuum pump is turned on and upon reaching a vacuum of 0.5 mm Hg. Art. the chamber is filled with argon. Then the inductor is turned on and, upon reaching L-120O C, the slag mixture melts. After exposure, the metal is poured into the funnel to level the composition of the refining melt. Upon completion of the refining process, which lasted 7-8 minutes, the metal is poured into a mold. Conducted chemical analysis shows that the phosphorus content has decreased to O, OO2%, sulfur - to 0.003%. In addition, there was a significant decrease in the hydrogen content (4-5 times). Thus, a higher degree of purification is achieved with less consumption of refining materials. The consumption of expensive slag-metal mixture is reduced by 2 times. The cost of the components of the slag-metal mixture is (based on 1 KI rubles: CaP / jO, 3, LiadO, 5, Ca 1.35, 14 1.5. Thus, the cost of the slag-metal mixture using the conventional method refining (20% by weight of processing a tapped metal) is: 1.8 "O, 3 + 0.20.5+ O, 21.35-f + 0.11.5 1, O6 rubles. When using this invention, it decreases 2 times and equal to: 1, О6; 2 0,53 rubles Based on 1 ton of the steel being processed, the economic efficiency is equal to Э (1,06-0,53) 100 53 rubles Br 1) Refining method of steel and alloys including filtering e metal, characterized in that, in order to improve the quality of the metal and reduce the consumption of the slag-metal mixture, the metal after filtration is passed through a layer of active slag-metal melt 2. Method according to claim 1, and in order to intensify the process, metal refining is carried out in a vacuum or neutral atmosphere. Sources of information taken into account in the examination 1. Authors certificate of the USSR No. 429878, cl. C 21 C 7 / OO, 1974.

2. Japanese Patent No. 54-3122, cl. 10 J 154, 1973.

3. Japanese Patent No. 51-49567, cl. 10 A, 1975.