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Medium carbon steel casting powder for H-section steel continuous casting

A technology of mold slag and H-shaped steel, which is applied in the field of steelmaking and continuous casting, can solve the problems of many mold slag accidents, which have not been found, and the surface quality of the slab is difficult to control, so as to achieve good surface quality of the slab and avoid longitudinal cracks on the surface of the slab , The effect of the thermal image is normal

Inactive Publication Date: 2013-03-27
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production status of H-beam medium-carbon billet continuous casting machine is: no effective mold slag technology solution has been found for the H-beam continuous casting process, resulting in many accidents in the H-beam continuous casting machine due to mismatching mold slag, and the surface of the billet Difficult to control quality

Method used

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  • Medium carbon steel casting powder for H-section steel continuous casting
  • Medium carbon steel casting powder for H-section steel continuous casting
  • Medium carbon steel casting powder for H-section steel continuous casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Crumble raw materials such as limestone, quartz sand, waste glass and fluorite into particles of 0.1-1 mm, and then mix them with powdery raw materials such as soda ash according to the chemical composition requirements described in Example 1 (see the table below) to form agglomerates , drying, melting in the shaft furnace with coke as fuel, and use as a semi-finished product after condensation and crushing. When the premelt slag is discharged from the furnace, a large flow of water is used to flush the slag for forced cooling to obtain a glassy phase premelt. Different proportions of graphite and carbon black are used for composite carbon matching, and together with the above-mentioned premelted materials, the finished mold powder is made through water milling, spray granulation, screening, cooling, testing, and packaging. The physical and chemical properties of the finished mold powder are shown in the table below.

[0022]

Embodiment 2

[0024] Limestone, quartz sand, waste glass, fluorite and other materials are broken into 0.1-1mm particles, and then mixed with powdery raw materials such as soda ash according to the chemical composition requirements described in Example 2 (see the table below) to form agglomerates , drying, melting in the shaft furnace with coke as fuel, and use as a semi-finished product after condensation and crushing. When the premelt slag is released from the furnace, a large flow of water is used to flush the slag and force cooling to obtain a glassy phase premelt. Different proportions of graphite and carbon black are used for composite carbon matching, and the above premelted materials are taken through water milling, spray granulation, screening, cooling, testing, and packaging to make finished mold powder. The physical and chemical properties of the finished mold powder are shown in the table below.

[0025]

Embodiment 3

[0027] Limestone, quartz sand, waste glass, fluorite and other materials are broken into 0.1-1mm particles, and then mixed with powdery raw materials such as soda ash according to the chemical composition requirements described in Example 3 (see the table below) to form agglomerates , drying, melting in the shaft furnace with coke as fuel, and use as a semi-finished product after condensation and crushing. When the premelt slag is released from the furnace, a large flow of water is used to flush the slag and force cooling to obtain a glassy phase premelt. Different proportions of graphite and carbon black are used for composite carbon matching, and the above premelted materials are taken through water milling, spray granulation, screening, cooling, testing, and packaging to make finished mold powder. The physical and chemical properties of the finished mold powder are shown in the table below.

[0028]

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Abstract

The invention relates to medium carbon steel casting powder for H-section steel continuous casting, belonging to the technical field of steelmaking and continuous casting. The medium carbon steel casting powder comprises the following components in percentage by weight: 33-39 percent of CaO, 35-39 percent of SiO2, 4-7 percent of Al2O3, 0-3 percent of MgO, 5-9 percent of F<->, 10-12 percent of Na2O, and balance of composite carbon which comprises 7 percent of graphite and 1-2.5 percent of carbon black, wherein the CaO and the SiO2 are used as base materials; and the Na2O, the MgO, the Al2O3 and the F<-> are used as flux. A preparation process comprises two steps, i.e. the step of producing pre-molten materials and the step of producing finished product casting powder. The prepared casting powder has physical properties that the melting point is 1080-1096DEG C, the viscosity at 1300DEG C is 0.17-0.35Pa.s and the melting speed is 30-40s. The thickness of the molten flux layer of the casting powder is 10-13mm. According to the requirement of carbon steel on the casting powder during production of an H-section steel continuous casting machine, the flux film control goals of lower melting temperature, lower viscosity, proper melting speed and higher thermal resistance are realized, and the situation that the surface of a casting blank is longitudinally cracked because the temperature gradient of the cross section of the casting blank is too large is avoided. The medium carbon steel casting powder has a better using effect than the using effect of domestic and foreign similar products, and can fully meet the process requirement on the carbon steel during H-section steel continuous casting.

Description

technical field [0001] The invention relates to medium-carbon steel mold slag for continuous casting of H-shaped steel, and belongs to the technical field of steelmaking and continuous casting. Specifically relates to a medium-carbon steel mold slag for continuous casting of H-shaped steel and a preparation method thereof Background technique [0002] In the process of continuous pouring of molten steel, mold slag is added on the surface of molten steel in the crystallizer, and its functions can be summarized as five points: 1) Insulation and heat preservation of exposed molten steel; 2) Prevention of secondary oxidation of molten steel; 3) Absorption and floating to molten steel Surface inclusions; 4) Fill the liquid slag film between the mold wall and the slab shell to play a lubricating role; 5) Control the heat transfer from the slab to the mold. Among the five functions of the above-mentioned mold flux, the lubrication and control of heat transfer between the mold and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 朱立光许莹韩毅华
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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