Special continuous casting crystallizer casting powder for carbon steel in ESP

A continuous casting mold and mold slag technology, applied in the field of steelmaking, can solve the problems of poor thermal insulation, slag addition, subcutaneous bubbles, etc.

Active Publication Date: 2018-04-20
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be applied to ESP, because the heat preservation effect is not good, and the surface vibration marks of the obtained slab are relatively large, and there are still quality problems such as slag addition and subcutaneous air bubbles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A special continuous casting mold powder for medium carbon steel in ESP, which includes the following components, fluorite, wollastonite, lithium limestone, lithium carbonate, manganese carbonate, sodium fluorosilicate, white alkali, bauxite, refractory Powder, clinker, carbon black, earthy graphite, binder, water reducer, the weight percentages are 13.6%, 41.5%, 2.0%, 1.0%, 2.0%, 3.0%, 12.0%, 7.3%, 2.0%, 3.0%, 2.0%, 1.0%, 1.5%, 1.0%.

[0022] The chemical composition percentage in the mold flux is 31.15% CaO, SiO 2 26.17%, MgO 7.37%, Al 2 o 3 4.54%, Na 2 O 7.88%, F - 7.72%, MnO 2 1.48%, Li 2 O 0.51%, C 2.78%. The physical index binary alkalinity (CaO / SiO2 ) 1.19. The melting temperature is 1025°C, and the viscosity at 1300°C is 0.12Pa·s.

Embodiment 2

[0024] A special continuous casting mold powder for medium carbon steel in ESP, which includes the following components, fluorite, wollastonite, lithium limestone, lithium carbonate, manganese carbonate, sodium fluorosilicate, white alkali, bauxite, refractory Powder, clinker, carbon black, earthy graphite, binder, water reducer, the weight percentages are 14.4%, 34.2%, 3.8%, 1.0%, 4.0%, 3.0%, 11.5%, 4.6%, 2.0%, 3.50%, 2.0%, 2.0%, 2.0%, 0.5%.

[0025] The chemical composition percentage in the mold flux is CaO 29.46%, SiO 2 23.97%, MgO 6.95%, Al 2 o 3 5.53%, Na 2 O 7.6%, F - 8.07%, MnO 2 2.97%, Li 2 O 0.64%, C 2.98%. The physical index binary alkalinity (CaO / SiO 2 ) 1.23. The melting temperature is 1066°C, and the viscosity at 1300°C is 0.103Pa•s.

Embodiment 3

[0027] A special continuous casting mold powder for medium carbon steel in ESP, which includes the following components, fluorite, wollastonite, lithium limestone, lithium carbonate, manganese carbonate, sodium fluorosilicate, white alkali, bauxite, refractory Powder, clinker, carbon black, earthy graphite, binder, water reducer, the weight percentages are 14.4%, 34.2%, 3.8%, 1.0%, 4.0%, 3.0%, 11.5%, 4.6%, 2.0%, 3.50%, 2.0%, 2.0%, 2.0%, 0.5%.

[0028] The chemical composition percentage in the mold flux is 32.1% CaO, SiO 2 25.63%, MgO 6.63%, Al 2 o 3 3.85%, Na 2 O 6.35%, F - 9.4%, MnO 2 2.6%, Li 2 O 0.67%, C 3.2%. The physical index binary alkalinity (CaO / SiO 2 ) 1.25. The melting temperature is 1076°C, and the viscosity at 1300°C is 0.089Pa·s.

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Abstract

The invention belongs to the technical field of steel making, and particularly relates to special continuous casting crystallizer casting powder for carbon steel in ESP. The special continuous castingcrystallizer casting powder for carbon steel in ESP comprises the following chemical components in percentages by mass: 29%-33% of CaO, 23%-27% of SiO2, 6.5%-8% of MgO, 3.5%-6% of of Al2O3, 6%-8% ofNa2O, 7.5%-9.5% of F<->, 1%-3% of MnO2, 0.4%-0.7% of Li2O and 2.5%-4.0% of C. The slagging speed is high, uniform slagging is implemented, the thickness of a slag film is suitable, consumption is moderate, and quality defects on the surface of a casting blank can be prevented.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to mold slag specially used for continuous casting molds for ESP medium carbon steel. Background technique [0002] Since 2008, the overcapacity of domestic iron and steel, coupled with the continuous strengthening of anti-dumping measures against Chinese steel exports in the international market, has made it difficult for most domestic steel mills to operate. Measures such as varieties of steel to improve operations. [0003] At present, the production method generally adopted by most domestic steel mills is to cast high-quality micro-alloy molten steel with continuous casting machines, and then cool the slab for secondary heating and rolling. This scheme is generally feasible, but higher cost. This requires a large amount of alloying elements due to the additional cooling. Over the years, many casting and rolling workshops have been built, but their traditional ...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 李晓阳彭会志陈永彦梁冠东庞天敏王岩
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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