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Continuously-cast mold powder for cold-rolled sheet steel and production method thereof

A technology of continuous casting mold slag and cold-rolled thin plate, which is applied in the field of steelmaking mold slag, which can solve the problems of changing the physical properties of mold slag, reduce the possibility of subsurface inclusions of steel plates, improve non-wetting properties, and reduce entanglement in molten steel The effect of the probability

Active Publication Date: 2014-10-22
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution increases the viscosity by adding high melting point substances, but adding high melting point substances will change the physical properties of mold flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6 and comparative example 1-2

[0047] Follow the steps below to manufacture mold flux for continuous casting of cold-rolled sheet steel:

[0048] (1) Grind the raw materials required for mold flux into fine powder and mix them evenly. The raw materials include but not limited to: limestone, quartz, wollastonite, magnesia, bauxite, fluorite, cryolite, glass, barium carbonate , soda ash, manganese carbonate, pigment manganese, lithium carbonate, lithium concentrate and titanium ore:

[0049] (2) Premelt to form a solid solution to obtain a faster and more uniform premelt;

[0050] (3) Cool and crush the premelt material, and grind it into premelt material fine powder with a particle size of less than 0.075mm;

[0051] (4) Use raw material fine powder to fine-tune according to the composition deviation, and add an appropriate amount of carbonaceous materials (such as carbon black or graphite), in which the proportion of premelt fine powder to mold flux is ≥50wt%, and control the chemical components of mold fl...

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Abstract

The invention discloses a continuously-cast mold powder for cold-rolled sheet steel. Chemical composition of the continuously-cast mold powder includes, by mass, Na2O 3-8%, MgO 3-12%, A12O3 3-12%, Li2O < / =3%, F <=5%, MnO < / =15%, BaO < / =8%, TiO2 < / =8%, C 1-3% and the balance of CaO, SiO2 and inevitable impurity and CaO / SiO2 0.8-1.3. The invention further discloses a production method of the continuously-cast mold powder. After fusion of the mold powder, surface tension of the mold powder reaches 450-550mN / m, and accordingly non-invasion between slags and liquid steel is greatly improved, and the mold powder is difficulty torn and involved in the liquid steel and can rapidly float even being involved in the liquid steel. Thus probability that the mold powder is caught by the liquid steel to form subsurface inclusion is greatly reduced, steel quality defect caused in the following cold rolling step is avoided, and yield of steel products is improved.

Description

technical field [0001] The invention relates to a slag material, in particular to a mold slag for steelmaking. Background technique [0002] The thickness of the finished steel products such as automobile plates and silicon steel is generally less than 1mm, which belongs to a kind of cold-rolled thin plate steel. The steel defects produced in the cold rolling process of thin plate steel are mainly due to the inclusion of mold slag, Al 2 o 3 caused by inclusions and air bubbles. Among them, mold slag inclusions account for more than 60% of such steel defects. [0003] Continuous casting mold slag is a powdery or small granular auxiliary material for steelmaking. It covers the surface of molten steel in the crystallizer of the continuous casting machine during the solidification process of molten steel. Under the high temperature of molten steel, the mold slag forms a solid-liquid mixture. The layer next to the molten steel is the molten layer to prevent secondary oxidatio...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 张晨蔡得祥梅峰施春月
Owner BAOSHAN IRON & STEEL CO LTD
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