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Mold powder for continuous casting mold of automobile sheet steel, its preparation method and application

A continuous casting crystallizer and mold slag technology, which is applied in the field of continuous casting and pouring steel, can solve the problems of limited research on ultra-low carbon steel, achieve good lubrication and heat transfer effects, prevent slab carburization, and prevent slab surface clamping Slag effect

Active Publication Date: 2021-05-04
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Many patents and papers have done a lot of research on billet carburization, but research on slag inclusion on the surface of billet is relatively more on low-carbon steel, but very limited on ultra-low carbon steel

Method used

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  • Mold powder for continuous casting mold of automobile sheet steel, its preparation method and application

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preparation example Construction

[0026] The embodiment of the present invention also provides a method for preparing mold flux for automobile sheet steel continuous casting molds. The prepared mold flux conforms to the above chemical composition by adjusting the composition of raw materials, including: mixing the raw materials of mold flux, pre- Melt and dry.

[0027] It should be noted that the preparation method of mold flux can adopt the existing conventional preparation method, which can be roughly summarized as follows: the raw materials are divided into base materials (wollastonite, calcite, fluorite, bauxite, magnesia) and fine materials, First mix the base material in proportion and enter the pre-melting furnace for pre-melting, then grind the base material into powder, and then mix with fine material, paste, granulate, and dry. The preparation methods provided in the following examples of the present invention all adopt this method, and details are not repeated.

Embodiment 1

[0030]This embodiment provides a mold flux for continuous casting molds of automobile sheet steel, whose raw materials include fluorite, white alkali, imported carbon black, domestic carbon black, earthy graphite, sodium fluorosilicate, wollastonite, clay , borax, red iron oxide, calcite, magnesia, bauxite, cryolite, dextrin (adhesive), polycarboxylate water reducer, sodium stearate dispersant, its weight percentage is 10.4% respectively , 0%, 1.0%, 1.0%, 0.5%, 1.0%, 67.5%, 3.5%, 1.0%, 1.0%, 0.5%, 5.8%, 1.3%, 3.0%, 1.5%, 0.5%, 0.5%.

[0031] The chemical composition percentage of the mold flux is CaO 36.3%, SiO 2 38.93%, MgO 6.41%, Fe 2 o 3 0.95%, Al 2 o 3 2.31%, Na 2 O 1.75%, F - 6.63%, B 2 o 3 0.37%, C 2.36%. Because some raw materials are lost by heating, the total content is less than 100%.

[0032] The physical index of the mold flux is binary basicity (CaO / SiO 2 ) 0.93, melting temperature 1225°C, viscosity at 1300°C 0.336Pa·s, surface tension 0.47N / m. The...

Embodiment 2

[0034] This embodiment provides a mold flux for continuous casting molds of automobile sheet steel, whose raw materials include fluorite, white alkali, imported carbon black, domestic carbon black, earthy graphite, sodium fluorosilicate, wollastonite, clay , borax, red iron oxide, calcite, magnesia, bauxite, cryolite, sodium carboxymethylcellulose (binder), polycarboxylate water reducer, sodium stearate dispersant, its weight percentage 10%, 0.5%, 0.5%, 1.0%, 0.3%, 0.5%, 66.5%, 4%, 0%, 1.5%, 1.5%, 6.5%, 2.0%, 3.2%, 0.7%, 0.8%, 0.5%.

[0035] The percentage of chemical composition in mold flux is CaO 36.1%, SiO 2 38.0%, MgO 7.06%, Fe 2 o 3 1.65%, Al 2 o 3 3.0%, Na 2 O 1.18%, F - 6.33%, B 2 o 3 0%, C 1.72%.

[0036] The physical index of mold flux is binary alkalinity (CaO / SiO 2 ) 0.95, melting temperature 1241°C, viscosity 0.37Pa·s at 1300°C, surface tension 0.51N / m.

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Abstract

The invention discloses mold slag used in continuous casting crystallizers for automobile sheet steel, a preparation method and application thereof, and relates to the technical field of continuous casting steel casting. Mold powders for automotive sheet steel continuous casting molds include CaO 36‑42%, SiO 2 37‑43%, MgO 5‑8%, Al 2 o 3 2-5%, Fe 2 o 3 0.5‑3%, Na 2 O 0.5‑2%, F ‑ 4.5-8%, C 1.5-3%. The preparation method of the mold slag used in the continuous casting crystallizer of automobile sheet steel is to make the prepared mold slag conform to the above chemical composition by adjusting the composition of raw materials, including: mixing the raw materials of the above mold slag, pre-melting and drying. The inventor adjusts the chemical composition of the mold flux and adopts a chemical composition of high magnesium and low sodium so that all the parameters of the mold flux meet the process requirements, which can prevent the carbonization of the slab and the slag inclusion on the surface of the slab.

Description

technical field [0001] The invention relates to the technical field of continuous casting and pouring steel, and in particular to mold slag used in continuous casting crystallizers for automobile sheet steel, its preparation method and application. Background technique [0002] Automotive sheet steel is referred to as IF steel, also known as interstitial atom-free steel, which is to add a certain amount of Ti and Nb to ultra-low carbon steel to completely fix the carbon and nitrogen atoms in the steel into carbon and nitrogen compounds, so that there are no interstitial atoms in the steel. Existence, clean steel, the steel has excellent ductility. [0003] In the 1960s, due to the application of vacuum deoxidation metallurgy technology, IF steel effectively reduced the content of C, N, and S in steel, and only a small amount of Ti and Nb was added to obtain ultra-deep drawing steel with excellent performance, which made IF steel develop rapidly. In 1994, the output of IF st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 陈永彦李晓阳秦教武徐金岩李冬冬王希彬任义
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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