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A kind of csp thin slab alloy peritectic steel special continuous casting mold powder and its application

A continuous casting mold and thin slab technology, which is applied in the field of steelmaking accessories, can solve the problems of grain boundary embrittlement, aggravate the surface quality defects of the casting billet, reduce the quality of the casting billet, etc. Heat transfer reduction effect

Active Publication Date: 2021-08-27
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of mold flux with high basicity, high melting point and low viscosity does not bring smooth casting speed at 5-7m / min, especially the addition of Nb, Ti, Mo, Cr and other alloying elements to improve the hardness of peritectic steel. High-strength steel increases the precipitation of fine carbon, nitrogen, and carbonitride along the austenite grain boundary, causing grain boundary embrittlement, aggravating the occurrence of surface longitudinal cracks, and quality defects on the surface of the slab, which reduces the quality of the slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a special continuous casting mold mold powder for CSP thin slab alloy peritectic steel, the raw materials of which are composed of the following materials: fluorite, clinker, white alkali, first carbon black, second carbon black, graphite, fluorine Sodium chloride, wollastonite, albite, lithium carbonate, borax, calcite, magnesia, bauxite, cryolite, dextrin, calcium lignosulfonate and sodium dodecylbenzenesulfonate. The weight percentages of each of the above substances are respectively 7.0%, 5.0%, 11.0%, 3.0%, 3.2%, 1.0%, 1.0%, 34.5%, 11.8%, 1.0%, 3.0%, 6.0%, 2.0%, 2.0% %, 6.0%, 1.5%, 0.5% and 0.5%.

[0055] Among them, the carbon content of the first carbon black is 99.5%, and the oil absorption value is 113g / cm 3 , the iodine absorption value is 136g / kg; the content of the second carbon black is 98.3%, and the oil absorption value is 42g / cm 3 , The iodine absorption value is 61g / kg.

[0056] After the above-mentioned raw materials are grou...

Embodiment 2

[0061] This embodiment provides a special continuous casting mold mold powder for CSP thin slab alloy peritectic steel, the raw materials of which are composed of the following materials: fluorite, clinker, white alkali, first carbon black, second carbon black, graphite, fluorine Sodium chloride, wollastonite, albite, lithium carbonate, borax, calcite, magnesia, bauxite, cryolite, dextrin, calcium lignosulfonate and sodium dodecylbenzenesulfonate. The weight percentages of the above-mentioned substances are respectively 5.5%, 2.5%, 6.5%, 1.5%, 4.0%, 2.0%, 1.0%, 43.5%, 10.0%, 0.5%, 5.0%, 4.8%, 1.1%, 1.6% %, 8.0%, 1.5%, 0.5% and 0.5%.

[0062] Among them, the carbon content of the first carbon black is 99.3%, and the oil absorption value is 116g / cm 3 , the iodine absorption value is 137g / kg; the content of the second carbon black is 98.8%, and the oil absorption value is 38g / cm 3 , The iodine absorption value is 58g / kg.

[0063] After the above-mentioned raw materials are gro...

Embodiment 3

[0067] This embodiment provides a special continuous casting mold mold powder for CSP thin slab alloy peritectic steel, the raw materials of which are composed of the following materials: fluorite, clinker, white alkali, first carbon black, second carbon black, graphite, fluorine Sodium chloride, wollastonite, albite, lithium carbonate, borax, calcite, magnesia, bauxite, cryolite, dextrin, calcium lignosulfonate and sodium dodecylbenzenesulfonate. The weight percentages of the above-mentioned substances are respectively 7.3%, 5.5%, 11.7%, 3.0%, 2.5%, 2.5%, 1.5%, 33.0%, 10.0%, 1.5%, 3.5%, 5.2%, 2.5%, 2.8% %, 5.0%, 1.5%, 0.5% and 0.5%.

[0068] Among them, the carbon content of the first carbon black is 99.5%, and the oil absorption value is 115g / cm 3 , the iodine absorption value is 141g / kg; the content of the second carbon black is 98.3%, and the oil absorption value is 39g / cm 3 , The iodine absorption value is 65g / kg.

[0069] After the above-mentioned raw materials are gr...

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Abstract

The invention discloses a special continuous casting crystallizer mold slag for CSP thin slab alloy peritectic steel and an application thereof, belonging to the technical field of steelmaking auxiliary materials. In terms of mass percentage, its chemical composition includes 20‑30% CaO, 20‑30% SiO 2 , 1.5‑5.0% MgO, 3.5‑6.0% Al 2 o 3 , 8.0‑13.5% Na 2 O, 5.5‑8.0% F ‑ , 2.0‑4.0% B 2 o 3 , no more than 1.0% Li 2 O, 5.5‑8.5% C and 0.34‑0.48% Fe 2 o 3 . It is suitable for continuous casting of peritectic steel with a casting speed of 5-7m / min, and the selection of raw materials and design of performance indicators are reasonable, the effect of lubrication and heat transfer is good, and the thickness of liquid slag layer is uniform and moderate, which can ensure the peritectic steel of CSP thin slab alloy The continuous casting process runs smoothly, preventing surface quality defects of the slab and obtaining good slab quality.

Description

technical field [0001] The invention relates to the technical field of steelmaking auxiliary materials, in particular to a special continuous casting mold mold slag for CSP thin slab alloy peritectic steel and its application. Background technique [0002] Peritectic steel series, especially the continuous casting production of peritectic steel with relatively high alloy content, due to the characteristics of the steel itself, it is not only unfavorable to the smooth casting during the casting process, but also easy to cause defects in the surface quality of the slab. The casting of quasi-steel and the surface quality of slabs have become recognized technical problems in the industry. At present, the casting of this type of steel is mainly concentrated in conventional slabs, medium and thick plates, etc. In the field of peritectic steel mold flux technology, people's general understanding is: high alkalinity, high melting point, low viscosity, including continuous casting o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 陈永彦李晓阳杜振宇马帅王岩李冬冬王希彬任义
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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