A kind of aluminate non-Newtonian continuous casting mold powder and its preparation method

A continuous casting mold and mold powder technology, which is applied in the field of aluminate non-Newtonian continuous casting mold mold powder and its preparation, can solve the problems of crystallizer system alarm phenomenon, high viscosity, and inability to take into account matching, and achieve a solution Inconsistent viscosity requirements, improved billet lubrication, and reduced slag entrainment

Active Publication Date: 2022-02-15
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aluminate mold flux has relatively high viscosity, and the lubricity under the crystallizer needs to be improved, which leads to frequent alarms in the crystallizer system during the industrial trial production process.
[0004] At present, aiming at the prevention of slag entrainment and the improvement of lubrication effect in the crystallizer, scientific research workers have carried out related experiments by adjusting the benchmark composition of mold flux and the type of flux, but none of them can effectively take into account the effect of slag entrainment prevention and improvement of lubrication effect
In addition, excessively adjusting the reference composition and flux will easily aggravate the deterioration of the performance of mold flux
[0005] In summary, the traditional silicate-based mold flux can no longer meet the continuous casting requirements of a series of high-alloy steels represented by high-aluminum steel.
The design and development of new aluminate-based mold flux provides strong support for solving the above problems. However, the existing aluminate-based mold flux still has problems such as slag entrainment prevention and casting slab lubrication.

Method used

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  • A kind of aluminate non-Newtonian continuous casting mold powder and its preparation method
  • A kind of aluminate non-Newtonian continuous casting mold powder and its preparation method
  • A kind of aluminate non-Newtonian continuous casting mold powder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Composition of aluminate non-Newtonian continuous casting mold flux, by mass parts CaO 46.36 parts, Al 2 o 3 38.64 parts, Li 2 O 10 parts, B 2 o 3 0 copies. The slag is equipped with carbonaceous material as a melting rate regulating component, and the carbonaceous material accounts for 5 parts, wherein the carbonaceous material is graphite.

[0051] The preparation method is:

[0052] The corresponding slag is prepared according to the chemical composition mass parts of the above-mentioned aluminate non-Newtonian continuous casting mold flux composition, wherein, Li 2 10 parts of O is based on the added raw material as Li 2 CO 3 Carry out, mix evenly and heat to 1500±10°C for high temperature pre-melting. After the slag sample is completely melted, it is water-quenched and then dried to obtain a pre-melted slag material. Grind and sieve the premelted material to make the particle size less than 0.074mm, then add the pre-prepared carbonaceous material, mix th...

Embodiment 2

[0057] The composition of aluminate non-Newtonian continuous casting mold flux contains 42 parts by mass of CaO, Al 2 o 3 35 parts, Li 2 O 10 parts, B 2 o 3 10 servings. The slag is equipped with carbonaceous material, which is a melting rate regulating component, and the carbonaceous material accounts for 3 parts. The carbonaceous material is graphite. The preparation method is the same as in Example 1.

[0058] The shear rate of the aluminate non-Newtonian continuous casting mold powder at 1200°C was measured by the rotating cylinder method controlled by a high-precision rheometer from 24.4s to 24.4s -1 increased to 36.6s -1 When the viscosity decreases, the shear thinning rate is 1.04%; the shear rate is changed from 36.6s -1 increased to 48.7s -1 When the viscosity decreases, the shear thinning rate is 0.73%; the shear rate is changed from 48.7s -1 increased to 60.9s -1 When the viscosity decreases, the shear thinning rate is 0.33%. Viscosity as a function of...

Embodiment 3

[0062] The composition of aluminate non-Newtonian continuous casting mold flux contains 43.2 parts by mass of CaO, Al 2 o 3 28.8 parts, Li 2 O 5 parts, B 2 o 3 15 servings. The slag is equipped with carbonaceous material, which is a melting rate regulating component, and the carbonaceous material accounts for 8%. The carbonaceous material is graphite. The preparation method is the same as in Example 1.

[0063] Aluminate-based non-Newtonian continuous casting mold flux at 1200°C, the shear rate is changed from 24.4s -1 increased to 36.6s -1 When the viscosity decreases, the shear thinning rate is 0.10%; the shear rate is changed from 36.6s -1 increased to 48.7s -1 When the viscosity decreases, the shear thinning rate is 0.13%; the shear rate is changed from 48.7s -1 increased to 60.9s -1 When the viscosity decreases, the shear thinning rate is 0.08%. Its viscosity varies with the shear rate as shown in Figure 5 As shown, in this case, when the mold powder slag ...

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Abstract

The invention relates to an aluminate-based non-Newtonian continuous casting mold mold flux and a preparation method thereof. The mold flux components are calculated in parts by mass, including CaO: 30-65 parts, Al2O3: 20-50 parts, B2O: 0-15 parts Parts, Li2O: 0-10 parts and C: 2-8 parts, raw material particle size below 0.074mm accounts for more than 75%; mold flux CaO and Al 2 o 3 The mass ratio is 1.0 to 1.5. The mold flux at 1200℃~1400℃, the shear rate is 24.4s ‑1 increased to 60.9s ‑1 , the viscosity decreases by 0.03-0.26Pa·s. The mold flux of the present invention effectively satisfies the different requirements for the viscosity of the mold flux in the stagnation area and the lubricating area of ​​the crystallizer, not only keeps the aluminate-based mold flux in the stagnation area to maintain a higher viscosity, reduces the phenomenon of slag entrainment, but also makes it The lubricated area reduces the viscosity and improves the lubrication of the casting slab, which is beneficial to ensure the smooth running of the high aluminum steel continuous casting process and improve the quality of the continuous casting slab.

Description

technical field [0001] The invention relates to an aluminate non-Newtonian continuous casting mold mold slag and a preparation method thereof, belonging to the technical field of steelmaking. Background technique [0002] Aluminum is added to steel as an important alloying element, and high-aluminum content steel grades with excellent performance are formed through corresponding rolling processes to realize different uses of high-aluminum steel grades. For example, adding about 0.5% to 1.8% Al to TRIP steel can stabilize the content of retained austenite and increase the aggregation degree of carbon in retained austenite, which is conducive to the formation of a certain amount of bainite and ferrite in the steel matrix. And the multiphase structure of retained austenite is widely used in the field of automobile industry. Adding about 1.5% to 2.5% Al to the non-magnetic steel can avoid the eddy current heat loss caused by the leakage magnetic field in the steel. It is widely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 亓捷刘承军刘昊姜茂发
Owner NORTHEASTERN UNIV LIAONING
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