SU1470728A1 - Initial composition for making refractory lining - Google Patents

Abstract

The invention relates to the field of producing refractory linings and can be used for the manufacture of crucible-ladle linings for the production of liquid oxide-fluoride melts. The invention is aimed at improving durability and reducing the cost of the lining. For this, a mixture of graphite grains and coal tar pitch is additionally introduced into the mixture by electroslag remelting of steel ingots under oxide fluoride flux with alumina content of 35-50 wt.% And calcium fluoride 43-51 wt.% With the following ratio of components, wt. .%: graphite grit 62-70, coal tar pitch 16-20, skull of the ESR 14-18. The use of the charge increases the lining resistance from 30-32 to 38-40 heats. The use of such a lining also reduces energy consumption when the flux is melted in a crucible to a ladle and the carbon content in the melt. 2 tab.

Description

I

The invention relates to the manufacture of refractory linings of crucibles for the production of liquid oxide-fluoride melts used in electroslag remelting (ES) of steel and alloys.

The purpose of the invention is to increase durability and reduce cost.

In addition, the skull of the sides of the steel ingot of electroslag remelting, vy-, is additionally introduced into the charge of production of the refractory lining.

fused under oxide fluoride flux.

The chemical composition (average of four ingots weighing about 18.6 tons each) of the skull at the height of the ESR, produced under the pressure of ANF-6, is given in Table. one,

For the manufacture of the charge, graphite grit, coal tar pitch and side skull are used, randomly selected from the bottom up to 0.7 heights of ingots weighing up to 19 tons, melted under AIF-6 flux. The original components are crushed to a fraction of 1-5 mm and

four:

tc

00

are uniformly mixed in proportions corresponding to the compositions of the known and proposed mixtures (Table 2). To manufacture the lining, the mixture is placed in a crucible-bucket of the U-503a type using a special template, packed and sintered by roasting for 2 days at a temperature not lower than 600 ° C, after which it is used for melting ANF-6 flux.

Claims (2)

The results of the experimental heats are given in table. 2. The formula of the invention The mixture for the manufacture of the refractory lining of crucible-buckets, including graphite grit and coal tar pitch, characterized in that, in order to increase durability and reduce the cost of lining, it further contains a skull of electroslag remelting of steel ingots under an oxide-fluoride flux containing 35-50% alumina and calcium fluoride 43-51% with the following ratio of components, wt.%: Graphite grains. 62-70 Coal peck16-20 Specified skarnisht4-18 ,Table 1 Editor N. Gunko Compiled by I. Khl pov Tehred L. Serdyukova Order 1433/27 Circulation 589 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 table 2 Proofreader M. Demchik Subscription