SU1440600A1 - Method of preparing steel-casting composition for bottom pouring of steel - Google Patents

Abstract

The invention relates to the field of ferrous metallurgy, in particular, to methods for preparing steel-casting compositions, and can be used for casting ingots by siphon. The purpose of the invention is to increase the reliability of sealing the joints and increase the operational durability of the pallets. The method involves laying siphon postings into the recesses of the pallet, applying to the working surface a layer of elastic refractory material, on the basis of mullite-silicon-earth-fiber with a thickness of 7–20 mm, installed, centering and molds on the working surface. SL C

Description

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The invention relates to ferrous metallurgy, in particular, to methods for preparing steamer compositions and can be used for casting ingots by siphon.

The purpose of the invention is to increase the reliability of the sealing of the joints and increase the efficiency of the pallets.

The method is carried out as follows.

Siphon wiring is placed in recesses on the working surface of the pallet on a bed of dry sand and gating holes are installed (central water and output by the number of molds). Then, a layer of elastic refractory material based on mullite silica fiber with a thickness of 7-20 mm is glued to the working surface of the pallet. After that, the center and molds are placed on the layer of elastic refractory material. The composition thus prepared with the mold U1I serves for casting,

Example Made whether the preparation of the safta with six pallets for casting wheel ingots weighing 4.1. tons and a height of 2.5 m. After laying the siphon wiring on the working surface of the pallets, in addition to the gating holes in the places occupied by the molds, wiring, weights and centering, they pasted a layer of refractory material based on mullite siliceous fiber - cardboard with a thickness of 7 mm and felt MKRV- 200 mm 20 mm. The material was glued with an aqueous solution of sulphite-yeast brew or liquid glass.

 Then, pivot points and molds were installed on these pallets. After casting

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steel, crystallization and cooling of ingots, the composition was sent for disassembly and new preparation.

None of the experienced pallets had a metal breakthrough, although some sprues had longitudinal scallops, indicating the partial destruction of some siphon tubes during the casting process.

The use of a material with a thickness of less than 7 mm does not ensure reliable sealing of the joints due to distortion of the equipment and the formation of allowable gaps of up to 5 mm. At the same time, the use of material with a thickness of more than 20 mm is not economically feasible.

The proposed method of preparing 0 compositions, in addition to increasing the reliability of sealing the joints, allows increasing the operational durability of the pallets and eliminating the leakage of liquid metal under the lower ends of the molds and increasing the yield of the suitable one.

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Claims (1)

Invention Formula A method for preparing steel casting compositions for siphon casting of steel, including laying siphon wiring in the recesses on the working surface of the pallet, placing an elastic gasket on the working surface of the pallet, installing a center pivot and molds, characterized in that, in order to increase the reliability of the sealing of the joints and increase the operational durability pallets, before installing the centering and molds on the working surface of the pallet put a layer of elastic refractory material based on mullite-siliceous fiber reimuschestvenno 7-20 mm thick.