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Carbon-free casting powder for casting steel making die

A mold slag and die casting technology, applied in the field of auxiliary materials for steel-making ingots, can solve the problems of poor spreadability and thermal insulation properties of mold slag, poor thermal insulation and spreading properties, low melting point viscosity, etc. Good thermal insulation performance and good melting performance

Inactive Publication Date: 2008-02-06
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitride has a high melting point, and its crystal lattice is similar to graphite. It can be used as a skeleton material in mold flux, but it is expensive, and the spreadability and heat preservation of mold flux are not as good as carbon-containing mold flux
Patent CN92106323.7 adopts carbon-free mold slag composed of natural wollastonite, limestone, potassium feldspar, fluorite, industrial soda ash, and vermiculite. This invention has a significant effect on preventing carbon increase of the cast slab, but the melting point viscosity is low and the consumption is large. , easy to sinter, poor thermal insulation and spreadability

Method used

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  • Carbon-free casting powder for casting steel making die

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] The formula of carbon-free mold flux for steelmaking mold casting is: containing CaO, SiO 2 and a small amount of Al 2 o 3 The wollastonite is the basic slag material, and the addition amount is 57wt%; it contains SiO 2 、Al2 o 3 The floating beads, the addition amount is 20wt%; contains SiO 2 、Al 2 o 3 The expanded perlite, the addition amount is 15wt%; Industrial soda ash, the addition amount is 8wt%.

[0036] The particle size control of the above-mentioned wollastonite, expanded perlite and industrial soda ash is: greater than 0.25 mm and less than 0.9%, less than 0.044 mm and not less than 57%; the particle size of floating beads is 100% less than 0.36 mm.

[0037] In this example, the physical properties of mold flux are: melting temperature is 1312°C; viscosity (1400°C Pa.s) is 1.7; bulk density is 0.39g / cm 3 .

[0038] The effect of using mold flux is: good melting performance, no carburization, and excellent surface quality of billets.

Embodiment 2

[0040] The formula of carbon-free mold flux for steelmaking mold casting is: containing CaO, SiO 2 and a small amount of Al 2 o 3 The wollastonite is the basic slag material, the addition amount is 50wt%; it contains SiO 2 、Al 2 o 3 The floating beads, the addition amount is 15wt%; contains SiO 2 、Al 2 o 3 The added amount of expanded perlite is 25wt%; industrial soda ash is added in an amount of 10wt%.

[0041] The particle size control of the above-mentioned wollastonite, expanded perlite and industrial soda ash is: greater than 0.25 mm and less than 0.8%, less than 0.044 mm and not less than 56%; the particle size of floating beads is 100% less than 0.35 mm.

[0042] In this example, the physical properties of mold flux are: melting temperature is 1310°C; viscosity (1400°CPa.s) is 1.6; bulk density is 0.31g / cm 3 .

[0043] The effect of using mold flux is: good melting performance, no carburization, and excellent surface quality of billets.

Embodiment 3

[0045] The formula of carbon-free mold flux for steelmaking mold casting is: containing CaO, SiO 2 and a small amount of Al 2 o 3 The wollastonite is the basic slag material, the addition amount is 68wt%; it contains SiO 2 、Al 2 o 3 The floating beads, the addition amount is 9wt%; contains SiO 2 、Al 2 o 3 The added amount of expanded perlite is 18wt%; industrial soda ash is added in an amount of 5wt%.

[0046] The particle size control of the above-mentioned wollastonite, expanded perlite and industrial soda ash is: greater than 0.25 mm and less than 0.85%, less than 0.044 mm and not less than 62%; the particle size of floating beads is 100% less than 0.34 mm.

[0047] In this example, the physical properties of mold flux are: melting temperature is 1340°C; viscosity (1400°C Pa.s) is 1.3; bulk density is 0.37g / cm 3 .

[0048] The effect of using mold flux is: good melting performance, no carburization, and excellent surface quality of billets.

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Abstract

The invention provides a carbon-free protective slag for steel-making mould casting, the percentage by weight compositions of components in the invention are as follows: 50 to 70 percent of e basic slag charge containing CaO, SiO2 and little Al2O3, 5 to 20 percent of hollow microsphere containing SiO2 and Al2O3, 10 to 25 percent of expanded perlite containing SiO2 and Al2O3, 5 to 15 percent of calcined soda for industrial purpose. The protective slag of the invention has fewer kinds of raw materials, good melting performance, good spreadability, low volume weight, good heat-insulating property, and can effectively avoid adding carbon to ingot steel.

Description

technical field [0001] The invention relates to the field of auxiliary materials for steelmaking ingots, in particular to a carbon-free mold slag for steelmaking mold casting. Background technique [0002] In the process of steelmaking and ingot casting, when injecting killed steel, the mold slag is usually placed or hung 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, It floats on the surface of the molten steel, because the melting point of the mold slag is much lower than the temperature of the molten steel, so a layer of liquid slag is formed on the surface of the molten steel, the molten steel continuously enters the ingot mold, the liquid steel level continues to rise, and the mold slag continues to melt, so that in the ingot A layer of mold slag film is formed between the solidified shell and the mold wall of the steel ingot, and until t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/18B22D1/00
Inventor 朱祖民蔡得祥张晨陈荣欢
Owner BAOSHAN IRON & STEEL CO LTD
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