Mold powder capable of effectively controlling peritectic steel thick slab narrow face depression defect

A technology for controlling cladding and mold slag, which is applied in the field of steelmaking-continuous casting, and can solve problems such as easy-to-deteriorate billet shell lubrication, billet shell bonded breakout, and high alkalinity of mold slag

Active Publication Date: 2010-06-30
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alkalinity of the mold slag is too high, resulting in high crystallization temperature, which

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0009] When a domestic factory was pouring a 320mm thick slab, a large area of ​​depressions and transverse cracks appeared on the narrow surface of the slab, and there have been no reports at home and abroad.

[0010] The ingredients used are: CaO: 38.05%, SiO 2 : 30.01%, CaF 2 : 10.2%, Na 2 O: 9.43%, MgO: 1.88%, Al 2 o 3 : 1.67%, Li 2 O: 0.035%, MnO: 0.042%, C: 8.5%, S: 0.183% mold flux cast a peritectic steel slab, the cross-sectional size is 1800mm × 320mm, the mold immersion nozzle insertion depth is 150mm, and the nozzle angle is 15℃ , with a casting speed of 0.7m / min, the heat flux density of the mold copper plate was tested and compared with the mold powder used originally. After the new slag is used, due to the change of the flow field of the mold, the mold slag is fully melted, the liquid slag layer penetrates into the slab and the mold evenly, and the heat flow of the inner and outer arcs of the mold is reduced to varying degrees, which has great influence on t...

example 2

[0013] When a factory was pouring a 250mm thick slab, the narrow surface of the slab often had depressions and transverse cracks on the narrow surface.

[0014] The ingredients used are: CaO: 38.02%, SiO 2 : 28.8%, CaF 2 : 9.9%, Na 2 O: 9.06%, MgO: 1.55%, Al 2 o 3 : 1.5%, Li 2 O: 0.01%, MnO: 0.035%, C: 8.2%, S: 1.1%, and the rest are impurities to cast a peritectic steel slab, the section size is 2000mm×250mm, the mold immersion nozzle insertion depth is 130mm, the nozzle The angle is 15°C and the casting speed is 0.9m / min. After using new slag, the narrow surface depression and transverse crack defects basically disappear, and the quality of the slab is good.

example 3

[0016] When a factory was pouring a 250mm thick slab, the narrow surface of the slab often had depressions and transverse cracks on the narrow surface.

[0017] The ingredients used are: CaO: 40.1%, SiO 2 : 30.02%, CaF 2 : 10.5%, Na 2 O: 9.5%, MgO: 1.93%, Al 2 o 3 : 1.93%, Li 2 O: 0.037%, MnO: 0.053%, C: 5.02%, and the rest are impurities to cast a peritectic steel slab, the cross-sectional size is 2400mm×250mm, the mold immersion nozzle insertion depth is 120mm, and the nozzle angle is 13°C. The casting speed is 0.85m / min. After using new slag, the narrow surface depressions and transverse crack defects basically disappear, and the billet quality is good.

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Abstract

The invention relates to a mold powder capable of effectively controlling peritectic steel thick slab narrow face depression defect. The mold powder comprises the following elements by weight percent: 38.02 to 40.1 percent of Cao, 28.8 to 30.02 percent of SiO2, 9.9 to 10.5 percent of CaF2, 9.06 to 9.5 percent of Na2O, 1.55 to 1.93 percent of MgO, 1.5 to 1.93 percent of AL203, 0.01 to 0.037 percent of Li2O and 0.035 to 0.053 percent of MnO. The mold powder has good lubricating property and spreadability. Because of the high melting speed, the invention can complement the quick consumption of liquid slag in time; because of the high alkalinity, the invention has strong absorbing and mixing capability; and because of the proper viscosity and the reasonable crystallization temperature, the invention plays an important role in uniformity. When the mold powder is applied to the casting of peritectic steel thick slab, the slag entrapment defect caused by crystallizer liquid level fluctuation is reduced greatly, the heat transmission uniformity is improved greatly and the surface quality of casting blank is good.

Description

technical field [0001] The invention belongs to the technical field of steelmaking-continuous casting, and in particular provides a new type of mold flux that can effectively control the concave defects of the narrow surface of the thick slab of peritectic steel, effectively controls the uniformity of the heat flow of the crystallizer, and is suitable for high-efficiency and stable thick-gauge slabs. The billet continuous casting process ensures the quality of the billet. Background technique [0002] When C in continuous casting peritectic steel is 0.08-0.18%, peritectic reaction occurs during the solidification process. When C is in 0.10%, the conversion rate between the δ phase and γ phase of the primary shell near the meniscus at high temperature is 100%, with This irregular shrinkage is mainly concentrated in the range of 100mm below the meniscus of the mold, so the gap between the primary shell and the hot surface of the mold is the largest, and the heat flow of the mo...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 刘洋王文军吕延春李占军姜中行王海宝朱志远王玉龙李景光危耀环杨国伟关春阳
Owner SHOUGANG CORPORATION
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