A Molding Slag Effectively Controlling Depression Defects on Narrow Faces of Peritic Steel Thick Slabs

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

Active Publication Date: 2011-12-07
SHOUGANG CORPORATION
View PDF0 Cites 0 Cited by
  • 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 is easy to deteriorate the lubrication of the billet shell and cause the billet shell to stick to breakout

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
viscosityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a mold slag that can effectively control the concave defect of the narrow surface of a peritectic steel thick slab. The weight percentages of the constituent elements of the mold flux are: CaO: 38.02%-40.1%, SiO2: 28.8-30.02%, CaF2: 9.9-10.5%, Na2O: 9.06-9.5%, MgO: 1.55-1.93%, AL2O3: 1.5 ~1.93%, Li2O: 0.01~0.037%, MnO: 0.035~0.053%. The mold flux has good lubricity and spreadability; it has a high melting speed and can replenish the rapid consumption of liquid slag in time; it has a high alkalinity and has a strong ability to absorb inclusions; it has a suitable viscosity and a reasonable crystallization temperature. Plays an important role in uniform slowness. When casting peritectic steel thick-gauge slabs, this mold powder is used to greatly reduce the slag-entrapment defects caused by the fluctuation of the crystallizer liquid level, the heat transfer uniformity is greatly improved, and the surface quality of the slab 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap