Unlock instant, AI-driven research and patent intelligence for your innovation.
Mold Mold Flux for Improving the Service Life of Submerged Nozzle
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 mold flux and immersion technology, which is applied in the field of continuous casting, can solve problems such as poor results, and achieve the effects of improving continuous casting production efficiency, reducing fluorine content, and improving the life of immersion nozzles
Active Publication Date: 2020-12-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
View PDF5 Cites 0 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
However, it is still not effective in solving the erosion of the slag line at the nozzle. It is necessary to simultaneously improve the physical and chemical indicators of mold slag while adopting the above methods
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
Embodiment 1
[0024] This embodiment is in 220×220mm 2 It is carried out on a four-strand billet continuous casting machine, using a straight-through submerged nozzle, and the material of the slag line of the nozzle is ZrO 2 -C, the wall thickness is 25mm, and the mass percentage of the finished product of continuous casting steel is as follows:
[0025] C≤0.018, Si 0.20-0.40, Mn 0.30-0.50, P≤0.035, S≤0.010, Cr 12.10-12.50, Ni≤0.60, N≤0.018, and the balance of iron.
[0026] Select the mold powder with the following physical and chemical indicators:
[0027] CaO 32%, SiO 2 37.2%, MgO 1.7%, Al 2 o 3 8.3%, Fe 2 o 3 0.2%, T·C 4.2%, ∑RO+RO 2 6.5%, melting point is 1100℃, alkalinity (CaO / SiO 2 )0.86, F - 2.6%, viscosity (1300°C) 0.60 Pa·s, moisture 0.2%.
[0028] Using the above indicators of mold mold powder, the average amount of molten steel per furnace is 83t, the casting time is 52min, 10 heats of steel are continuously cast, the residual wall thickness of the nozzle slag line...
Embodiment 2
[0030] This embodiment is carried out on a four-strand round billet continuous casting machine with a diameter of 230mm, using a straight-through submerged nozzle, and the material of the slag line of the nozzle is ZrO 2 -C, the wall thickness is 23mm, and the mass percentage of the finished product of continuous casting steel is as follows:
[0031] C≤0.025, Si 0.20-0.40, Mn 0.30-0.50, P≤0.030, S≤0.010, Cr 16.60-17.50, Ni≤0.15, N≤0.025, and the balance of iron.
[0032] Select the mold powder with the following physical and chemical indicators:
[0033] CaO 36%, SiO 2 36%, MgO 0.9%, Al 2 o 3 6.7%, Fe 2 o 3 0.9%, T·C 5.0%, ∑RO+RO 2 8.1%, melting point is 1150℃, alkalinity (CaO / SiO 2 )1.0, F - 4.2%, viscosity (1300°C) 0.40 Pa·s, moisture 0.3%.
[0034] In this example, the average amount of molten steel per furnace is 85t, the casting time is 55min, 10 furnaces are continuously cast, the residual wall thickness at the submerged nozzle slag line is 10mm, the erosion...
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
viscosity
aaaaa
aaaaa
Login to View More
Abstract
The invention discloses crystallizer protecting slag prolonging the service life of a submerged nozzle. The binary basicity (CaO / SiO2) of the crystallizer protecting slag is 0.86-1.0, the content of F<-> is 2.6-4.2%, and the viscosity under 1300 DEG C is 0.40-0.60 Pa.s. According to the crystallizer protecting slag prolonging the service life of the submerged nozzle, during continuous casting of ferrite stainless steel, due to the fact that the binary basicity (CaO / SiO2) of the crystallizer protecting slag, the content of F<->, and the viscosity are controlled within preset ranges, the erosionrate of a submerged nozzle slag line can be lowered, the service life of the submerged nozzle is prolonged, continuous casting multi-furnace continuous casting is achieved, and the production efficiency of continuous casting is improved; meanwhile, the problem that due to hole penetrating and breaking of the nozzle slag line portion, the molten steel quality is affected is solved; and besides, the content of fluorine in the crystallizer protecting slag can also be lowered, and pollution caused by fluoride to the atmosphere is reduced.
Description
technical field [0001] The invention relates to the technical field of continuous casting, in particular to a mold powder for improving the service life of a submerged nozzle. Background technique [0002] Because continuous casting has many advantages such as energy saving and consumption reduction, high production efficiency, mechanization and automatic operation, etc., when designing and producing various parts blanks, the continuous casting method is often preferred to make molten steel solidify and form. The submerged nozzle is located between the continuous casting tundish and the mold, which has the functions of preventing secondary oxidation and splashing of the molten steel, adjusting the flow field of the molten steel in the mold, and preventing the mold slag from being involved in the molten steel; the mold slag is placed on the surface of the molten steel in the mold , has the functions of thermal insulation, air isolation, lubricating casting slab, improving hea...
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