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Continuous casting method for high-titanium steel slab

A steel slab and continuous casting technology, applied in the field of metallurgy, can solve problems such as nozzle blockage, achieve the effect of avoiding oxidation and reducing secondary inclusions

Active Publication Date: 2020-08-04
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is: the existing high-titanium steel slab continuous casting method cannot avoid the problem of nozzle blockage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 carries out continuous casting to high titanium steel slab with the method of the present invention

[0040] Steel containing 0.1% titanium is produced, and the billet size is 1200mm×200mm.

[0041] (1) Air curtain retaining wall is used in the tundish, and the argon flow rate of the air curtain retaining wall is 10L / min; the liquid surface of the tundish is protected by argon gas, and the argon flow rate at the long nozzle and each stopper position is 20L / min to maintain positive pressure . From the ladle to the tundish, from the tundish to the crystallizer, a protective casing is used to protect the pouring process, and the protective casing is baked for 4 hours in advance; from the start of pouring to the stable casting speed, the liquid level of the crystallizer needs to be protected by argon gas, and the flow rate is 10L / min.

[0042] (2) The N content in the steel is 25ppm, cast at a high superheat (40°C), the pouring temperature is 1580°C, and the...

Embodiment 2

[0045] Embodiment 2 carries out continuous casting to high titanium steel slab with the method of the present invention

[0046] Steel containing 0.8% titanium is produced, and the billet size is 1400mm×230mm.

[0047] (1) The tundish adopts an air curtain retaining wall, and the argon gas flow rate of the air curtain retaining wall is 20L / min; the liquid surface of the tundish is protected by argon gas, and the argon gas flow rate at the long nozzle and each stopper position is 30L / min to maintain positive pressure . From the ladle to the tundish, from the tundish to the crystallizer, a protective sleeve is used to protect the pouring process, and the protective sleeve is baked for 5 hours in advance; during the period from the start of pouring to the stable casting speed, the liquid level of the crystallizer needs to be protected by argon gas, and the flow rate is 20L / min.

[0048] (2) The N content in the steel is 28ppm, cast at high superheat (50°C), the pouring tempera...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a continuous casting method for a high-titanium steel slab. In order to solve the problem that an existing continuous casting method for high-titanium steel cannot avoid nozzle clogging, the continuous casting method for the high-titanium steel slab is provided. The method includes the following steps that a, agas curtain barricade is adopted in a tundish, argon protection is adopted for a liquid surface, protected casting with protective sleeves is adopted in the whole process from a steel ladle to the tundish and from the tundish to a crystallizer, and before a first furnace starts casting and ladle changing is performed, a steel tube is connected to a long nozzle; b, when the N content in steel is less than or equal to 30 ppm, a high-superheat casting process is adopted, wherein the pulling rate is less than or equal to 1.1 m / min; and c, a technology of dynamic soft reduction at the final stageof solidification is adopted, and a secondary cooling system of strong cooling in the terminal area of solidification is adopted for secondary cooling. The method can reduce secondary inclusions by 30-50% and avoid the massive generation of TiN in the tundish, so that the problem of nozzle clogging is avoided, and the number of continuous casting heats is increased to be greater than 2. The methodachieves continuous casting of the high-titanium steel on the premise of ensuring the quality of the cast slab and has great significance.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-titanium steel slab continuous casting method. Background technique [0002] High-titanium steel (Ti greater than 0.1%) has the characteristics of high strength, high toughness, and high wear resistance due to the precipitation of TiC, and has wide application prospects. However, the continuous casting production of high-titanium steel is currently a difficult problem at home and abroad. On the one hand, high-titanium steel is easy to liquidate the high-melting point compound TiN, which adheres to the inner wall of the nozzle during continuous casting. Usually, the nozzle will be blocked after one furnace is produced and continuous casting cannot be continued. In addition, during continuous casting, titanium in steel is easy to react with mold slag to form TiO 2 , and then deteriorate the physical properties of the mold flux, including melting point, viscos...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D11/18B22D11/22
CPCB22D11/16B22D11/18B22D11/225
Inventor 谢鑫曾建华王谦周明佳
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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