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High-aluminum steel die casting protective slag

A technology of mold flux and high-aluminum steel, which is applied in the field of high-aluminum steel mold casting mold flux, which can solve the problems of impractical casting of aluminum-containing steel, difficulty in producing aluminum-containing steel, difficulty in solving pits on the surface of billets and internal slag inclusions, etc. question

Active Publication Date: 2014-07-30
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent 201010030218.3, the water-cooled mold casting powder provided only solves the problem of water-cooled mold casting of common steel types, and is not practical for casting of aluminum-containing steel
It is very difficult to produce aluminum-containing steel through water-cooled die-casting technology, and the pits on the surface of the slab and the slag inclusions in the interior have always been difficult to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] During the trial production process of water-cooled mold casting, defects such as surface cracks, pits, and sticky slag were found in the conventional casting mold flux. According to the characteristics of the steel type and the casting process, the viscosity and melting point of the mold flux were reduced, the carbon solid content was reduced, and the melting speed was increased. . Cast steel type: P80A. The secondary oxidation of molten steel is serious, and the surface and subcutaneous inclusions of the slab are mainly Al 2 o 3 , the ability of mold flux to absorb inclusions mainly refers to the speed of absorbing inclusions and the stability of performance after absorbing inclusions, which depends on its chemical composition.

[0035] Production process route: electric furnace + LF + VD + water-cooled die casting.

[0036] The high-aluminum steel mold casting mold flux suitable for water-cooled mold casting in this embodiment has a chemical composition in weight ...

Embodiment 2

[0040] During the trial production process of water-cooled mold casting, defects such as surface cracks, pits, and sticky slag were found in the conventional casting mold flux. According to the characteristics of the steel type and the casting process, the viscosity and melting point of the mold flux were reduced, the carbon solid content was reduced, and the melting speed was increased. . Cast steel type: P80A. The secondary oxidation of molten steel is serious, and the surface and subcutaneous inclusions of the slab are mainly Al 2 o 3 , the ability of mold flux to absorb inclusions mainly refers to the speed of absorbing inclusions and the stability of performance after absorbing inclusions, which depends on its chemical composition.

[0041] Production process route: electric furnace + LF + VD + water-cooled die casting.

[0042] The high-aluminum steel mold casting mold flux suitable for water-cooled mold casting in this embodiment has a chemical composition in weight ...

Embodiment 3

[0046] During the trial production process of water-cooled mold casting, defects such as surface cracks, pits, and sticky slag were found in the conventional casting mold flux. According to the characteristics of the steel type and the casting process, the viscosity and melting point of the mold flux were reduced, the carbon solid content was reduced, and the melting speed was increased. . Cast steel type: P80A. The secondary oxidation of molten steel is serious, and the surface and subcutaneous inclusions of the slab are mainly Al 2 o 3 , the ability of mold flux to absorb inclusions mainly refers to the speed of absorbing inclusions and the stability of performance after absorbing inclusions, which depends on its chemical composition.

[0047] Production process route: electric furnace + LF + VD + water-cooled die casting.

[0048] The high-aluminum steel mold casting mold flux suitable for water-cooled mold casting in this embodiment has a chemical composition in weight ...

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Abstract

The invention relates to a mold flux, specifically a high-alumina steel mold casting mold flux, the chemical composition of which is SiO2: 22-28%, Al2O3: 2-7%, CaO: 16-22%, Fe2O3: 2-5%, MgO: 2-5%, MnO: 2-6%, BaO: 5-10%, B2O3: 4-6%, R2O: 5-10%, F: 7-12%, C : 2-4%, the sum of the weight percentages of the above components is 100%, and the R2O is composed of Na2O and Li2O. The invention can solve the quality problems of longitudinal cracks, pits and sticky slag on the surface of cast high-alumina steel, and can inhibit the reductive elements from being oxidized and enter the slag to denature the slag, ensure the stability of the mold slag performance, and improve the slag absorption at the same time Al2O3 rate.

Description

technical field [0001] The invention relates to a mold flux, in particular to a high-alumina steel mold casting mold flux. Background technique [0002] The role of traditional mold casting mold flux: isolation from the atmosphere, meniscus heat insulation and absorption of non-metallic inclusions, no lubrication, no need to control heat transfer to the mold wall. The slag isolates the air to prevent the oxidation of molten steel; the unmelted solid slag has a thermal insulation effect on the molten steel; the slag also absorbs inclusions such as alumina in the molten steel. During die casting, the bagged powder slag is hung or put into the mold before pouring, the energy of the molten steel will burn the bag, and the powder slag will be scattered on the surface of the molten steel. Due to the requirements of mold casting conditions, the mold flux has low alkalinity, high viscosity, and a melting point of 1100-1250°C. The main chemical composition of its base material: SiO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/04B22D27/18B22D7/00
Inventor 李明吴年春尹雨群党军殷浩张逖张文明
Owner NANJING IRON & STEEL CO LTD
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