Aluminate series non-Newtonian continuous casting crystallizer casting powder and preparation method thereof

A continuous casting mold and mold flux technology is applied in the field of aluminate non-Newtonian continuous casting mold mold flux and its preparation. Inconsistent viscosity requirements, improved billet lubrication, and reduced slag entrainment

Active Publication Date: 2021-05-07
NORTHEASTERN UNIV
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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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  • Aluminate series non-Newtonian continuous casting crystallizer casting powder and preparation method thereof
  • Aluminate series non-Newtonian continuous casting crystallizer casting powder and preparation method thereof
  • Aluminate series non-Newtonian continuous casting crystallizer casting powder and preparation method thereof

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 aluminate series non-Newtonian continuous casting crystallizer casting powder and a preparation method thereof. The casting powder comprises the components of, by mass, 30-65 parts of CaO, 20-50 parts of Al2O3, 0-15 parts of B2O, 0-10 parts of Li2O and 2-8 parts of C, wherein the raw materials with the granularity smaller than 0.074 mm account for 75% or above, and the mass ratio of CaO to Al2O3 in the casting powder is 1.0-1.5. The viscosity of the casting powder is reduced by 0.03-0.26 Pa.s when the shearing rate is increased from 24.4 s <-1 > to 60.9 s <-1 > at the temperature of 1200-1400 DEG C. The casting powder effectively meets different requirements of a retention area and a lubrication area of a crystallizer on the viscosity of the casting powder, the aluminate series casting powder keeps high viscosity in the retention area, a slag entrapment phenomenon is reduced, the viscosity of the aluminate series casting powder is reduced in the lubrication area, lubrication of a casting blank is improved, smooth operation of a high-aluminum steel continuous casting process is guaranteed, and the quality of the continuous casting blank is improved.

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 Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 亓捷刘承军刘昊姜茂发
Owner NORTHEASTERN UNIV
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