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Pre-melting type crystallizer casting powder for rare earth stainless steel and preparation method of pre-melting type crystallizer casting powder

A technology of mold mold slag and stainless steel, applied in the field of metallurgy, to achieve good heat insulation effect, light stack specific gravity, and reduce heat transfer speed

Pending Publication Date: 2022-07-08
JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent number is CN104550797A, a low-reactivity mold powder for rare earth steel continuous casting, which uses CaO-Al 2 o 3 The mold powder of the system; the patent number is CN111331093B, a kind of mold powder for rare earth microalloyed reinforced steel crystallizer and its preparation and application method, which is applied to the microalloyed steel bar, but not applied to stainless steel; the patent number is CN113804828A, a kind of rare earth research The method of interaction between molten steel and mold slag is just a research method, and does not involve the invention of specific mold slag for rare earth stainless steel

Method used

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  • Pre-melting type crystallizer casting powder for rare earth stainless steel and preparation method of pre-melting type crystallizer casting powder
  • Pre-melting type crystallizer casting powder for rare earth stainless steel and preparation method of pre-melting type crystallizer casting powder
  • Pre-melting type crystallizer casting powder for rare earth stainless steel and preparation method of pre-melting type crystallizer casting powder

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Experimental program
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Effect test

Embodiment 1

[0023] The present embodiment provides a pre-melting mold mold powder for rare earth stainless steel. According to the characteristics of rare earth stainless steel continuous casting, the pre-melting mold mold mold powder has (1) relatively high oxidation resistance; (2) relatively good The ability to dissolve and absorb rare earth inclusions, lower the viscosity of mold slag; (3) lower solidification temperature and crystallization rate, thereby improving the lubrication of mold slag; (4) appropriate melting speed can control the thickness of the slag layer, Thin slag layer will shorten the reaction time between slag and rare earth; (5) high basicity can improve the ability and speed of mold slag to dissolve, absorb inclusions, and control heat transfer. 2 It reacts with rare earth to increase the basicity of slag, and the basicity of mold slag is not easy to be too high. The appropriate basicity should be 0.95 to 1.05; (7) Select the appropriate flux, carbonaceous material ...

Embodiment 2

[0028] The present embodiment provides a pre-melting mold mold powder for rare earth stainless steel, which comprises 48.6 parts of pre-melted calcium silicate with a particle size of 200 mesh or more, 8.1 parts of blast furnace water slag, 5.6 parts of albite, 2.8 parts of quartz powder, Lithium carbonate 0.7 parts, soda ash 10.4 parts, sodium fluoride 2.3 parts, fluorite 12.3 parts, borax 2.0 parts, strontium carbonate 2.0 parts, sodium silicate 1.0 parts, metal silicon 1.5 parts, calcined alpha alumina 0.9 parts, mixed carbon 1.8 parts , plus binder and water, through batching, pulping, spray granulation, screening, cooling, testing, and packaging, the pre-melting mold mold powder for rare earth stainless steel is obtained.

[0029] Table 3 Physical and chemical indicators of embodiment 2

[0030] .

Embodiment 3

[0032] The present embodiment provides a pre-melted mold slag for rare earth stainless steel, comprising 50.8 parts of pre-melted calcium silicate with a particle size of 200 mesh or more, 6.8 parts of blast furnace water slag, 6.7 parts of albite, 2.5 parts of quartz powder, 1.0 parts of lithium carbonate, 10.0 parts of soda ash, 3.0 parts of sodium fluoride, 11.5 parts of fluorite, 1.5 parts of borax, 1.5 parts of strontium carbonate, 0.9 parts of sodium silicate, 1.0 parts of metallic silicon, 1.0 parts of calcined alpha alumina, 1.8 parts of mixed carbon , plus binder and water, through batching, pulping, spray granulation, screening, cooling, testing, and packaging, the pre-melting mold mold powder for rare earth stainless steel is obtained.

[0033] Table 4 Physical and chemical indicators of embodiment 3

[0034] .

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Abstract

The invention discloses pre-melting type crystallizer casting powder for rare earth stainless steel and a preparation method, and relates to the technical field of metallurgy, hollow particles for spray granulation comprise the following chemical components in percentage by mass: 29.6%-33.6% of CaO, 29.6%-33.6% of SiO2, 0.4%-3.4% of MgO, 5.1%-8.1% of Al2O3, 9.8%-13.8% of Na2O + K2O, 6.4%-10.4% of F, 0.1%-1.1% of Li2O, 0.6%-1.6% of B2O3, 0.4%-2.4% of SrO, 1.2%-2.2% of solid C and the balance of inevitable impurities, the melting point is 1027-1077 DEG C, and the viscosity at 1300 DEG C is 0.14-0.24 Pa.S. The invention further discloses a preparation method of The prepared casting powder is hollow particles and is light in bulk specific weight, and spreadability is improved; the hollow sphere particles subjected to spray granulation can form a heat insulation layer, so that the outward heat transfer speed of molten steel can be effectively reduced, and the heat insulation effect is good.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a premelting type mold powder for rare earth stainless steel and a preparation method. Background technique [0002] The austenitic heat-resistant stainless steel represented by 253MA contains a small amount of rare earth metals in addition to the alloy elements chromium and nickel, which significantly improves its oxidation resistance and high temperature corrosion resistance, and has higher strength at high temperatures. Good formability, widely used in the manufacture of various heat-resistant components. [0003] Table 1 252MA chemical composition (%) [0004] [0005] Rare earths are added into molten steel by adding them into the ladle, and feeding the wire at the nozzle of the crystallizer. After the process of adding rare earth to the ladle, the structure and properties of the steel are significantly improved. The rare earth has a good effect of deoxidizing, desul...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111Y02P10/20
Inventor 冯为民王丁丁单以钢侴宏晔尹玉服黄健
Owner JIANGSU JIANAI HIGH TEMPERATURE MATERIAL
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