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Nozzle coating for continuous casting of rare earth steel and preparation method of nozzle coating

A coating and rare earth technology, which is applied in the field of rare earth steel continuous casting nozzle coating and its preparation, can solve the problems of nozzle nodulation and blockage, achieve the effect of improving utilization efficiency and reducing foreign inclusions

Active Publication Date: 2022-07-08
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, aiming at the deficiencies in the prior art, the present invention aims to provide a nozzle coating for rare earth steel continuous casting and its preparation method, so as to solve the problem of nozzle nodules and blockage in the current rare earth steel continuous casting process

Method used

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  • Nozzle coating for continuous casting of rare earth steel and preparation method of nozzle coating
  • Nozzle coating for continuous casting of rare earth steel and preparation method of nozzle coating
  • Nozzle coating for continuous casting of rare earth steel and preparation method of nozzle coating

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preparation example Construction

[0060] On the other hand, the present invention provides the preparation method of the above coating, the preparation method comprises the steps:

[0061] Step 1. Grind the alumina material, the magnesia material, the cerium oxide material and / or the lanthanum oxide material, and the binder into powders of less than 200 mesh (<0.075mm) respectively;

[0062] Step 2. Mix the above materials evenly in proportion;

[0063] Step 3, drying the above-mentioned mixed materials for later use.

[0064] Specifically, in step 1, according to the mass percentage content, Al in the alumina material 2 O 3 ≥98%, such as industrial alumina; MgO ≥98% in magnesia materials, such as magnesia; CeO in cerium oxide materials 2 ≥99%; La in lanthanum oxide material 2 O 3 ≥99%; the binder is the binder used for refractory gunning materials, and the binder is powdered organic matter, such as natural organic matter: dextrin, starch, etc.; synthetic organic matter: phenolic resin, epoxy resin, etc. ...

Embodiment 1

[0088] The steel produced is wear-resistant steel NM400, and the production process is converter → LF furnace → RH furnace → continuous casting. The target composition is: C0.19-0.21%; Si 0.55-0.65%; Mn 1.45-1.60%; P≤0.015%; S≤0.005%; Cr 0.35-0.45%; Ti 0.01-0.02%; Ce 0.005%; La 0.005%.

[0089] The raw materials used are industrial alumina, magnesia, cerium oxide, lanthanum oxide and dextrin. The chemical composition of industrial alumina is Al 2 O 3 It accounts for 98.5%; the chemical composition of magnesia is MgO, accounting for 99%; cerium oxide and lanthanum oxide are pure reagents, and the content of rare earth oxides is 99%. Starch acts as a binder. The specific composition is: industrial alumina 59%, magnesia 26%, cerium oxide 5%, lanthanum oxide 5%, dextrin 5%.

[0090] Preparation method of powder:

[0091] Step 1. Grind industrial alumina, magnesia, cerium oxide, lanthanum oxide and dextrin into powders below 200 meshes respectively;

[0092] Step 2, mix the ...

Embodiment 2

[0101] The steel produced is wear-resistant steel NM400, and the production process is converter → LF furnace → RH furnace → continuous casting. The target composition is: C0.19-0.21%; Si 0.55-0.65%; Mn 1.45-1.60%; P≤0.015%; S≤0.005%; Cr 0.35-0.45%; Ti 0.01-0.02%; Ce 0.005%; La 0.005%.

[0102] The raw materials used are industrial alumina, magnesia, cerium oxide, lanthanum oxide and starch. The chemical composition of industrial alumina is Al 2 O 3 It accounts for 99%; the chemical composition of magnesia is MgO, accounting for 98.5%; cerium oxide and lanthanum oxide are pure reagents, and the content of rare earth oxides is 99%. Starch acts as a binder. The specific composition is: industrial alumina 65%, magnesia 29%, cerium oxide 1.5%, lanthanum oxide 1.5%, starch 3%.

[0103] Preparation method of powder:

[0104] Step 1. Grind industrial alumina, magnesia, cerium oxide, lanthanum oxide and starch into powders below 200 meshes respectively;

[0105] Step 2, mix the...

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Abstract

The invention discloses a nozzle coating for continuous casting of rare earth steel and a preparation method of the nozzle coating, belongs to the technical field of refractory materials, and solves the problem that a nozzle is nodulated and blocked in the current continuous casting process of the rare earth steel. The invention relates to a nozzle coating for continuous casting of rare earth steel, which comprises the following components: magnesium aluminum oxide and rare earth oxide, and the mass ratio of the magnesium aluminum oxide to the rare earth oxide is 83.3-94: 1.98-10; the magnesium-aluminum oxide is MgO.Al2O3 or takes MgO.Al2O3 as a main component, and contains a trace amount of MgO; the rare earth steel is steel containing rare earth cerium and / or lanthanum, and the type of the rare earth oxide is the same as that of rare earth in the rare earth steel. The nozzle coating can reduce nodulation of the submersed nozzle in the rare earth steel continuous casting process, so that the replacement frequency of the submersed nozzle is averagely reduced by more than 50%, and smooth operation of rare earth steel continuous casting is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and particularly relates to a rare earth steel continuous casting nozzle coating and a preparation method thereof. Background technique [0002] Rare earth has the functions of purification, metamorphic inclusions, microalloying, grain refinement and dispersion strengthening in steel, and has the title of "industrial monosodium glutamate". Important issues for the application of elements in steel. [0003] Nozzle nodule is due to the chemical reaction and sintering reaction of rare earth elements in the steel and oxides in the refractory material of the nozzle during continuous casting, such as magnesia, alumina, silicon dioxide, etc., which erodes the inner wall of the nozzle and causes the inner wall of the nozzle to be rough and further react. The generated rare earth oxides, sulfides, etc., as well as the inclusions in the molten steel are continuously attached and accumulated o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/08C09D7/61C09D7/65B22D41/54
CPCC09D1/00C09D5/08C09D7/61C09D7/65B22D41/54Y02P10/20
Inventor 吴伟智建国赵博
Owner CENT IRON & STEEL RES INST
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