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Tool and mold steel mold casting powder

A technology for tool and die steel and mold slag, which is applied in the field of auxiliary materials for steelmaking ingots, can solve the problems of easy aggregation of inclusions on the surface of the ingot, and achieve the effects of good spreadability, prevention of secondary oxidation and uniform coverage.

Active Publication Date: 2016-11-16
CHANGXING MINGSHENG METALLURGY FURNACE CHARGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of alloy elements in tool and die steel, the molten steel is easily oxidized to produce a large number of inclusions. Although the purity of molten steel can be improved and various large inclusions can be effectively removed by refining outside the furnace, during the pouring process, when When the ability of mold slag to absorb inclusions is weak, inclusions are easy to gather on the surface of the slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A mold casting mold flux for tool and mold steel, which is composed of the following components in mass percentage: 2% soda ash, 2% fluorite, 14% perlite, 10% diatomite, 20% power plant ash, 30% clinker, High alumina powder 5%, feldspar powder 15%, expanded graphite 2%. The mold casting mold flux under the above ratio has the most stable performance, with a melting point of 1210°C, a melting speed of 30s, and a viscosity of 0.28Pa.s.

[0014] The particle size of the fluorite is 200 mesh. The particle size of the diatomite and perlite is controlled to be less than 1% if it is larger than 50 mesh, and larger than 80% if it is smaller than 270 mesh. Al in the high alumina powder 2 o 3 The content is 80%.

Embodiment 2

[0016] A mold casting mold flux for tool and mold steel, which consists of the following components in mass percentage: 1.8% soda ash, 2.3% fluorite, 17.5% perlite, 8.3% diatomite, 21.5% power plant ash, 28.0% clinker, High alumina powder 4.5%, feldspar powder 13.9%, expanded graphite 2.2%. The melting point of the mold flux at the above ratio is 1230°C, the melting speed is 45s, and the viscosity is 0.38Pa.s.

[0017] The particle size of the fluorite is 200 mesh. The particle size control of the diatomite and perlite is: greater than 50 mesh and less than 1%, less than 270 mesh and greater than 80%, the Al in the high alumina powder 2 o 3 The content is 80%.

Embodiment 3

[0019] A mold casting mold flux for tool and die steel, which consists of the following components in mass percentage: 2.2% soda ash, 1.7% fluorite, 10.5% perlite, 12.7% diatomite, 21.5% power plant ash, 28.0% clinker, High alumina powder 5.5%, feldspar powder 16.1%, expanded graphite 1.8%. The melting point of mold flux under the above ratio is 1250°C, the melting speed is 55s, and the viscosity is 0.25Pa.s.

[0020] The particle size of the fluorite is 200 mesh. The particle size of the diatomite and perlite is controlled to be less than 1% if it is larger than 50 mesh, and larger than 80% if it is smaller than 270 mesh. Al in the high alumina powder 2 o 3 The content is 80%.

[0021] The above three embodiments of the present invention can basically eliminate defects such as cracks, pits, and sticky slag on the surface of the slab, and greatly improve the pass rate of the surface of the tool and die steel slab. Among them, the melting rate of embodiment 1 is the fastest...

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Abstract

The invention relates to a tool and mold steel mold casting powder is composed of, by mass percentage, 1.8%-2.2% of sodium carbonate, 1.7%-2.3% of fluorite, 10.5%-17.5% of perlite, 8.3%-12.7% of kieselguhr, 18.5%-21.5% of power plant ash, 28.0%-32.5% of clinker, 4.5%-5.5% of high aluminum powder, 13.5%-16.5% of feldspar powder, 1.8%-2.2% of expanded graphite, and the sum of all the ingredients is 100%. The mold casting powder is high in occluded foreign substance absorption capacity, the occluded foreign substrate formed due to oxidation can be prevented from gathering in the surface of a casting blank, and the problems of longitudinal cracks and pits on the surface of the tool and mold steel are solved; and part of the perlite is replaced with the kieselguhr, so that the mold casting powder is better in spreadability and smaller in surface tension and capable of evenly covering the surface of molten steel and playing the function of preventing secondary oxidation of the molten steel.

Description

technical field [0001] The invention relates to the field of auxiliary materials for steelmaking and casting ingots, in particular to mold casting mold flux for tool and mold steel. Background technique [0002] In the process of steelmaking and ingot casting, when injecting killed steel, usually place or hang mold slag at the bottom of the ingot mold or near the bottom of the ingot mold. When the molten steel enters the bottom of the ingot mold through the soup channel and contacts the mold slag, the protection The slag floats on the surface of the molten steel. Since the melting point of the mold slag is much lower than the temperature of the molten steel, a liquid slag layer is formed on the surface of the molten steel. The molten steel continuously enters the ingot mold, and the molten steel level continues to rise, and the mold slag continues to melt. , so that the surface of the steel ingot is covered by a layer of slag film. [0003] Mold slag for steelmaking ingots ...

Claims

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Application Information

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IPC IPC(8): B22D27/18B22D7/00
CPCB22D7/00B22D27/18
Inventor 汤卫明李开胜
Owner CHANGXING MINGSHENG METALLURGY FURNACE CHARGE
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