Fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology for mold slag and carbon steel, applied in the field of iron and steel smelting and continuous casting, can solve the problems of weak control ability of mold slag heat transfer, increased probability of viscous breakout, long incubation time, etc., to solve the problem of fluorine pollution and reduce treatment costs. , the effect of excellent crystallization performance
Active Publication Date: 2015-05-13
CENT SOUTH UNIV
View PDF6 Cites 15 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0006] The main problems faced in the non-fluoridation process of medium-carbon mold flux are: 1. How to ensure the stability of the viscosity-temperature characteristics under high temperature conditions after the mold flux is free of fluoride; 2. How to precipitate under the condition of fluorine-free Close crystals to ensure effective control of heat transfer during solidification
The results show that after adding titanium, the mold flux will precipitate CaOSiO 2 TiO 2 Mineral phase, the incubation time of this mineral phase is very long at high temperature, the crystallization ability is much lower than that of commercial fluorine-containing slag, and the ability of mold slag to control heat transfer is weak
At the same time, the addition of Ti is easy to form TiN and Ti(C,N) at high temperature, and the probability of viscous breakout is greatly increased
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
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0028] Ingredients: binary alkalinity CaO / SiO 2 1.18, CaO 40%, SiO 2 34%, Al 2 o 3 3%, MgO 2%, Na 2 O 9%, Li 2 O 3%, B 2 o 3 8%, ZrO 2 1%.
[0029] Preparation process: Weigh the above-mentioned mold slag raw materials according to the target components, and perform mechanical stirring to make the components evenly mixed, and then use an intermediate frequency induction furnace to heat and melt the mixed samples to remove volatiles and gas substances, and form complex Solid solution, the molten slag is poured into water and quenched to obtain a glassy mold slag block, and the mold slag block is mechanically crushed and ground to obtain the required mold slag powder.
[0030] For the main physical properties of mold flux, see Table 1 .
Embodiment 2
[0032] Ingredients: binary alkalinity CaO / SiO2 is 1.25, CaO 40%, SiO 2 32%, Al 2 o 3 5%, MgO 2%, Na 2 O 9%, Li 2 O 1%, B 2 o 3 9%, ZrO 2 2%.
[0033] Preparation process: with embodiment 1.
[0034] For the main physical properties of mold flux, see Table 1 .
Embodiment 3
[0036] Ingredients: binary alkalinity CaO / SiO2 is 1.27, CaO 42%, SiO 2 33%, Al 2 o 3 3%, MgO 2%, Na 2 O 10%, Li 2 O 1%, B 2 o 3 7%, ZrO 2 2%.
[0037] Preparation process: with embodiment 1.
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
Property
Measurement
Unit
melting point
aaaaa
aaaaa
viscosity
aaaaa
aaaaa
Login to view more
Abstract
The invention discloses a fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel. The mould flux is composed of, by mass, 35%-45% of CaO, 30%-35% of SiO2, 2%-5% of Al2O3, 1%-3% of MgO, 6%-10% of B2O3, 10%-15% of (Na2O+Li2O) and 1%-3% of ZrO2, wherein the ratio of (Na2O+Li2O+ZrO2) to B2O3 is greater than or equal to 1.3 and smaller than or equal to 2. The fluoride-free mould flux is excellent in crystallization property, the crystallized phase is calcium borate silicate, and meanwhile ZrO2 is added so as to facilitate precipitation of the calcium borate silicate, refine grains of the calcium borate silicate and enhance the stability of the calcium borate silicate. The mould flux contains no fluoride, solves the problem of fluorine pollution in the continuous casting process, and can greatly reduce treatment cost of continuous casting cooling water and the corrosion speed of a casting machine.
Description
technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to the preparation and stabilization technology of fluorine-free protective slag for continuous casting of zirconium-containing medium carbon steel and a new type of lance spar crystal mineral phase replacement. Background technique [0002] Continuous casting technology is one of the key technologies to optimize the modern iron and steel industry. The continuous casting mold mold slag plays an important role in the continuous casting process, such as heat insulation, preventing secondary oxidation of molten steel, absorbing non-metallic inclusions, lubricating the billet shell, and controlling heat transfer. Among them, the lubrication and heat transfer functions are the most important, which play an extremely important role in improving the surface quality of the slab and ensuring the smooth progress of the continuous casting process. At present, the prop...
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
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more