SU340285A1 - Flux for electroslag remelting of metals and alloys - Google Patents

Description

Union of Soviet. Socialist

Republics

State Committee

USSR for inventions and discoveries

SUMMARY OF THE INVENTION

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate-wu - (22) 3Approved 25.06.70 (21) 1442646 / 22-02 with the addition of application No.- (23) Priority_

Published on June 25th, 1980. Bulletin No. 23

Date of publication of the description 28.06.80

(..) 340285

(51) M. Cl *; С 21 С 5/54 'С 21 С 5/56 (53) UDK621.365.

.3 (088.8) (72) The inventors. B. I. Medovar, V. M. Martyn, L. V. Chekotypo, V. M. Baglay, V. L. Artamonov and V. G. Popov (71) Applicant

Order of Lenin and the Order of the Red Banner of Labor Institute of Electric Welding. E, O. Patona (54) FLUX FOR ELECTRIC SLAG RELEASING OF METALS AND ALLOYS

In practice, fluoride-based electroslag remelting fluxes (CaF ₂ -CaO; CaF _z -A2 ₂ O _a ; CaF _a -CaO-AE ₂ O ₉ -MgC> _? CaF ₂ -MgO; CaF ₂ Mg'Fj) are usually used containing a small amount of silicon oxide (not more than 7%). These fluxes ⁵ have good refining ability in electroslag surfacing of ingots into a stationary mold, but are unsuitable for smelting ingots with their extraction from the mold. ¹⁰ Due to the high fluidity of the fluxes in molten form, it is not possible to obtain a satisfactory surface of the drawn ingots.

Welding fluxes containing 16% or more silicon oxide are also known. However, such fluxes, as the research results show, are unsuitable for electroslag remelting due to their insufficient refining ability.

The proposed flux is based on calcium fluoride and contains, by weight. %: calpium oxide 18-25, magnesium oxide 102

15, alumina 10-15, silicon oxide 8-14, the total content of impurities (in the form of ReO, MnO, S, P, C and others) is not more than 5%.

The specified flux can be used for remelting various grades of steel and alloys. It provides a high degree of refinement of re-machined metal, as well as good surface quality of elongated ingots as they are surfaced during electroslac remelting.

The resistance of the proposed flux at temperatures of 165O-1800 ° C, i.e., at the temperatures of the slag bath during electroslag remelting, is sufficient to release in the slag the power necessary for melting the metal of the consumable electrodes and the occurrence of physicochemical processes in the slag bath.

Claims (1)

In practice, generally used are fups for an eectrod pack re-pappan fluoride-based (CaF –CaO; CaFj. O CaFji – CaO – AejOg – MgCK, CaF –MgO; CaF, MgPj) systems containing a small amount of silicon oxide (not more than 7%) . These fluxes have a good refining ability for electroslag deposition of ingots into a stationary crystallizer, but are unsuitable for smelting ingots with their drawing out of the crystallizer. Due to the high fluidity of the powders in molten form, it is not possible to obtain a satisfactory surface of the drawn ingots. Welding fluxes containing 16% or more silica are also known. However, such fluxes, as shown by research results, are unsuitable for electroslag remelting because of their insufficient refining ability. The proposed flux is created on the basis of calcium fluoride and contains, by weight. %: calcium oxide 18-25, magnesium oxide 1O15, aluminum oxide 1O-15, silicon oxide 8-14, the total content of impurities (in the form of FeO, MnO, S, P, C and others) is not more than 5%. This flux can be used to remelt various steels and alloys. It provides a high degree of refining of the remelted metal, as well as good surface quality of the ingots being drawn in as it is built-up during electroslag remelting. The resistance of the proposed invention at temperatures of 165 ° -18OO ° C, i.e., at the temperatures of the slag bath during the electroslag remelting, is enough to separate the slag with the power required to melt the metal of consumable electrodes and the flow of physicochemical processes in the slag bath. Claims of the invention Flux for electroslag remelting of metals and alloys consisting of fluoride caps, calcium oxide, mag3 oxide, 3402854 t {B2, CASTING aluminum, - oxides in; {) shlniy.i - Kapyga oxide 18-25 & rimsvivvshkheokisimarganpa, 6kis and v4 C is magnesium 10-15 sulfur phosphorus and carbon, distinguishing -Aluminium 10-15 About the fact that, in order to improve the surface-silicon oxide 8-14 TR of extruded ingot, components taken-and not more than 5 You are in the following ratio, weight.%: Calcium fluorideEverything.