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Continuous casting crystallizer covering slag special for IF steel

A technology for continuous casting mold and mold flux, which is applied to the field of mold flux for continuous casting molds for IF steel, can solve the problems of poor heat transfer performance, high melting point, low mold flux basicity, etc., so as to reduce production costs and use. amount of effect

Active Publication Date: 2017-03-22
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mold slag has low basicity and high melting point, which leads to poor heat transfer performance and is not suitable for IF steel

Method used

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  • Continuous casting crystallizer covering slag special for IF steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A mold powder for continuous casting mold for IF steel, made of the following raw materials in parts by weight: 4 parts of fluorite, 5 parts of cement clinker, 6 parts of white alkali, 1 part of carbon black, 55 parts of wollastonite, bentonite 4 parts, 2 parts of carbonless soot, 2 parts of calcite, 7 parts of manganese carbonate, 10 parts of bauxite and 1 part of binder.

[0031] Wherein the binder is sodium hydroxymethyl cellulose.

[0032] The chemical composition and weight percentage of the tested product are: CaO: 38.1%, SiO 2 : 33.0%, MgO: 8.9%, Al 2 o 3 : 8.8%, Na 2 O: 3.1%, MnO2 : 3.5%, F: 2.5%, C solid: 1.2%, the balance is unavoidable impurities, basicity: 1.15, melting point: 950°C, viscosity at 1300°C: 0.45Pa.S.

Embodiment 2

[0034] A mold powder for continuous casting mold for IF steel, made of the following raw materials in parts by weight: 7 parts of fluorite, 6 parts of cement clinker, 5 parts of white alkali, 1 part of carbon black, 56 parts of wollastonite, bentonite 5 parts, 3 parts of carbonless soot, 3 parts of calcite, 6 parts of manganese carbonate, 9 parts of bauxite and 1.5 parts of binder.

[0035] Wherein the binder is sodium hydroxymethyl cellulose.

[0036] The chemical composition and weight percentage of the tested product are: CaO: 39.5%, SiO 2 : 29.6%, MgO: 8.6%, Al 2 o 3 : 8.4%, Na 2 O: 3.5%, MnO 2 : 3.2%, F: 4.8%, C solid: 1.0%, the balance is unavoidable impurities, basicity: 1.33, melting point: 970°C, viscosity at 1300°C: 0.39Pa.S.

Embodiment 3

[0038] A mold powder for continuous casting mold for IF steel, made of the following raw materials in parts by weight: 6 parts of fluorite, 7 parts of cement clinker, 4 parts of white alkali, 3 parts of carbon black, 57 parts of wollastonite, bentonite 6 parts, 4 parts of carbonless soot, 4 parts of calcite, 5 parts of manganese carbonate, 8 parts of bauxite and 2 parts of binder.

[0039] Wherein the binder is sodium lignosulfonate.

[0040] The chemical composition and weight percentage of the tested product are: CaO: 40.6%, SiO 2 : 31.8%, MgO: 7.6%, Al 2 o 3 : 5.4%, Na 2 O: 3.1%, MnO 2 : 3.4%, F: 4.6%, C solid: 1.9%, the balance is unavoidable impurities, basicity: 1.28, melting point: 1000°C, viscosity at 1300°C: 0.32Pa.S.

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Abstract

The invention discloses continuous casting crystallizer covering slag special for IF steel. The continuous casting crystallizer covering slag is prepared from the chemical components of, by weight, 38%-42% of CaO, 28%-33% of SiO2, 6%-9% of MgO, 5%-9% of Al2O3, 3%-5% of Na2O, 3%-5% of MnO2, 2%-5% of F, 1%-2% of solid C and the balance inevitable impurities; according to the covering slag, the alkalinity ranges from 1.1 to 1.5, the melting point ranges from 950 DEG C to 1040 DEG C, and the viscosity at 1,300 DEG C ranges from 0.25 Pa.S to 0.45 Pa.S. The covering slag can improve heat transfer property, thermal insulation property and lubricating property of the IF steel, an IF steel casting blank is good in surface quality, and the yield of casting blanks is 100%.

Description

technical field [0001] The invention belongs to the technical field of continuous casting production, and in particular relates to mold powder for continuous casting molds dedicated to IF steel. Background technique [0002] The initial solidification process of ultra-low carbon steel consists of three stages: in the first stage, due to the large degree of undercooling during the nucleation of ultra-low carbon steel, the grains grow rapidly on the surface of the crystallizer after nucleation, forming fine grains This is the formation mechanism of the microstructure of ultra-low carbon steel; the second step, due to the rapid release of latent heat, the solidification stagnates, resulting in the transformation of the microstructure into a leucorrhea structure; the third step, the formation of the solidification structure mainly played by heat conduction The transformation forms a coarse grain structure. Due to the small solid-liquid phase interface energy of ultra-low carbon...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 朱书成李晓阳马帅徐金岩屈党军王旭阳
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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