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Mould powder for manganese-containing low content alloy peritectic steel subjected to continuous casting by thick slab caster

A mold powder and low-alloy technology, applied in the field of metallurgical auxiliary mold mold powder, can solve the problem of high incidence of longitudinal cracks on the surface of the slab, achieve good heat preservation and melting performance, reduce the incidence of longitudinal cracks, and heat transfer. Stable and even effect

Active Publication Date: 2010-12-01
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a mold mold flux for continuous casting of manganese-containing low-alloy peritectic steel by a wide-thick slab caster. The problem of high incidence of surface longitudinal cracks

Method used

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  • Mould powder for manganese-containing low content alloy peritectic steel subjected to continuous casting by thick slab caster
  • Mould powder for manganese-containing low content alloy peritectic steel subjected to continuous casting by thick slab caster

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Effect test

Embodiment 1

[0032] The chemical composition weight percentage of mold residue is: CaO 50.4%, SiO 2 30.0%, Li 2 O4.6%, Na 2 O 0.8%, F - 6.7%, MgO 1.3%, Al 2 O 3 3.9% Fe 2 O 3 0.5%, C 1.8%. Physical properties of mold powder: melting point of 1093°C, viscosity of 1300°C of 0.076 Pa·S, solidification temperature of 1142°C, and crystallization incubation time of 22 seconds.

Embodiment 2

[0034] The chemical composition of the mold residue is: CaO 49.1%, SiO 2 28.9%, Li 2 O4.9%, Na 2 O 0.6%, F- 7.1%, MgO 1.6%, Al 2 O 3 5.5% Fe 2 O 3 0.6%, C 1.7%. Physical properties of mold powder: melting point of 1084°C, viscosity of 1300°C of 0.068 Pa·S, solidification temperature of 1133°C, and crystallization incubation time of 21 seconds.

Embodiment 3

[0036] The chemical composition of the mold residue is: CaO 50.5%, SiO 2 29.0%, Li 2 O4.1%, Na 2 O 0.9%, F - 6.9%, MgO 1.2%, Al 2 O 3 4.9% Fe 2 O 3 0.7%, C 1.8%. Physical properties of mold powder: melting point of 1107°C, viscosity of 1300°C of 0.072 Pa·S, solidification temperature of 1147°C, and crystallization incubation time of 24 seconds.

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Abstract

The invention relates to metallurgical auxiliary material mould powder, in particular to mould powder for manganese-containing low content alloy peritectic steel which is subjected to continuous casting by a thick slab caster. The mould powder for the manganese-containing low content alloy peritectic steel which is subjected to the continuous casting by the thick slab caster comprises cement clinker, wollastonite, fluorite, sodium carbonate, lithium carbonate, slaked lime, refining slag powder and carbon black; the mould powder comprises the chemical components in percentage by weight: 4.0 to 5.0 percent of Li2O, 28.0 to 31.0 percent of SiO2, 48.0 to 51.0 percent of CaO, 3.0 to 6.0 percent of Al2O3, 0.5 to 1.5 percent of Na2O, 6.0 to 8.0 percent of F<->, 1.0 to 2.0 percent of MgO, 0.5 to 1.0 percent of Fe2O3 and 1.5 to 2.0 percent of C. The mould powder solves the problem of high incidence of longitudinal cracks on the surface of a casting blank in the process of the continuous casting for the manganese-containing low content alloy peritectic steel by the thick slab caster, and has the advantages of low melting point and solidification temperature, and short crystallization incubation time.

Description

technical field [0001] The invention relates to metallurgical auxiliary material mold powder, in particular to mold mold powder for continuous casting of manganese-containing low-alloy peritectic steel in a wide and thick slab casting machine. Background technique [0002] Longitudinal cracks on the slab surface are the most common quality defects of peritectic steel cast by slab casters, and the incidence of this type of crack is closely related to the performance of mold flux. As the width of the slab increases, the tensile stress on the surface of the slab increases continuously, and the temperature difference between the center point and the side of the wide and thick slab will be higher than that of the ordinary slab, and the resulting shrinkage stress and thermal stress are easily concentrated in the center. Therefore, surface longitudinal cracks are more likely to occur than ordinary slabs. In addition, steel grades with a carbon content of 0.08% to 0.17% will underg...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 职建军文光华唐萍徐国栋胡会军冯长宝刘国强
Owner BAOSHAN IRON & STEEL CO LTD
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