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Special continuous casting crystallizer protection slag for bloom type easy-cutting steel and preparation method thereof as well as bloom type easy-cutting steel continuous casting method

A technology for continuous casting mold and free-cutting steel, applied in the field of steelmaking, can solve the problems of large slag bars, scarring, and thick iron oxide scale on the molten steel surface, and achieve a suitable thickness of the liquid slag layer, moderate consumption of liquid slag, The effect of solving billet cracks

Active Publication Date: 2019-07-23
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a continuous casting crystallizer protective slag specially used for free-cutting steel for blooms, which aims to improve the existing easy-cutting steel continuous casting, which is easy to produce large slag bars on the liquid steel surface and thick iron oxide scale on the surface of the slab. , or defects such as rough surface, cracks, slag grooves, scarring, and depressions

Method used

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preparation example Construction

[0026] The preparation method of mold flux for continuous casting mold for bloom free-cutting steel provided by the present invention comprises: making the mold flux preparation raw material into hollow spherical mold flux, the raw material of mold flux includes main ingredients, and the main ingredients include: Wollastonite, carbonless soot, glass powder, fluorite, clinker, white alkali, carbon black, earthy graphite, clay, lithium carbonate, borax, calcite, magnesia, and bauxite.

[0027] Using these main materials and making reasonable preparations, after firing according to the conventional method of preparing mold flux, it can be prepared with a chemical composition of 27-32% CaO, 40-43% SiO 2 , 1-4% MgO, 3.5-6% Al 2 o 3 , 1~4%Na 2 O, 0.77~4%F ﹣ , 0.19~1%Li 2 O, 0.25-1.47% B 2 o 3 And 8-14% C, may also include some unavoidable impurities of hollow spherical mold flux, and the various materials selected are conventional and easily available materials.

[0028] Afte...

Embodiment 1

[0038] This embodiment provides a method for preparing mold flux for continuous casting molds for free-cutting blooms, which includes preparing mold flux raw materials into hollow spherical mold fluxes. The preparation raw materials are calculated in parts by weight: 47 parts of wollastonite, 13 parts of carbonless soot, 6 parts of glass powder, 6 parts of fluorite, 1.5 parts of clinker, 2.2 parts of white alkali, 2 parts of carbon black, and 8.5 parts of earthy graphite 4.2 parts of clay, 1.8 parts of lithium carbonate, 2 parts of borax, 0.5 parts of calcite, 0.5 parts of magnesia, 2.0 parts of bauxite, 2 parts of binder and 0.8 parts of water reducer.

[0039] The chemical composition of the mold flux prepared as mold flux is: CaO 27.52%, SiO 2 41.69%, MgO 1.43%, Al 2 o 3 4.1%, Na 2 O 2.1%, F - 2.6%, Li 2 O 0.75%, 0.98% B 2 o 3 , C 9.6%, and the balance is unavoidable impurities.

[0040] The physical indicators of the obtained mold flux are: binary basicity (CaO / S...

Embodiment 2

[0042] This embodiment provides a method for preparing mold flux for continuous casting molds for free-cutting blooms, which includes preparing mold flux raw materials into hollow spherical mold fluxes. The preparation raw materials are calculated in parts by weight: 46 parts of wollastonite, 12.5 parts of carbon-free soot, 6 parts of glass powder, 7 parts of fluorite, 1.9 parts of clinker, 2.5 parts of white alkali, 2 parts of carbon black, and 8 parts of earthy graphite 3.8 parts of clay, 2 parts of lithium carbonate, 1.5 parts of borax, 1 part of calcite, 1 part of magnesia, 2.0 parts of bauxite, 2 parts of binder and 0.8 parts of water reducer.

[0043] The chemical composition of the mold flux prepared as mold flux is: CaO 28.51%, SiO 2 41.35%, MgO 1.83%, Al 2 o 3 4.2%, Na 2 O 2.3%, F - 3.1%, Li 2 O 0.85%, 0.74% B 2 o 3 , C 9.2%, and the balance is unavoidable impurities.

[0044] The physical index binary alkalinity (CaO / SiO 2 ) 0.69, melting temperature 1237°...

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Abstract

The invention relates to the technical field of steelmaking, and provides a special continuous casting crystallizer protection slag for bloom type easy-cutting steel. The protection slag comprises thefollowing components of, by weight, 27%-32% of CaO, 40%-43% of SiO2, 1%-4% of MgO, 3.5%-6% of Al2O3, 1%-4% of Na2O, 0.77%-4% of F-, 0.19%-1% of Li2O, 0.25%-1.47% of B2O3 and 8%-14% of C. The protection slag can solve the problems that the molten steel surface is prone to generate large slag strips, and the surface of a casting blank is not smooth in the continuous casting process of the easy-cutting steel. The invention further provides a method for preparing the protection slag by taking wollastonite, carbon-free soot, glass powder, fluorite, clinker, white alkali, carbon black, amorphous graphite, clay, lithium carbonate, borax, calcite, magnesia and bauxite as raw materials. The invention further provides a bloom type easy-cutting steel continuous casting method using the protection slag in the continuous casting process. The casting blank prepared by using the method is good in quality.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a mold powder for continuous casting of free-cutting billet steel, a preparation method thereof, and a continuous casting method for free-cutting billet steel. Background technique [0002] At present, with the overcapacity in the country and the low profits generated by most steel mills producing low-end ordinary steel, the production of various steels is a major trend. Among them, the free-cutting steel produced by blooms is a relatively profitable one. product. [0003] And with the development of modern industry towards automation, high-speed and precision processing, steel is required to have good cutting process performance and improve production efficiency to adapt to mass production. Therefore, it is necessary to use more steel materials that improve and improve the cutting performance, so as to facilitate the processing of automatic cutting machine tools. Free-cutt...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 马帅梁冠东屈党军杜振宇陈永艳徐金岩彭会志王希彬
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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