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Continuous casting ladle bottom argon blowing control method for smelting heavy rail steel

A control method, the technology of bottom argon blowing, is applied in the field of steelmaking and continuous casting, which can solve the problems of difficult operation, high requirements for ladles, and high equipment investment costs, and achieve the effects of simple control, broad application prospects, and stable effects

Pending Publication Date: 2021-11-19
HANDAN IRON & STEEL GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In production practice, the longer argon blowing time at the bottom of the ladle seriously affects the production efficiency of smelting heavy rail steel, which does not meet the requirements of high-efficiency steelmaking production, but the insufficient argon blowing time at the bottom of the ladle will affect the removal effect of inclusions
[0005] Chinese patent 202010726677.9 discloses a soft blowing method and control device for blowing argon at the bottom of the continuous casting ladle turret. Before soft blowing in this patent, it is necessary to select the air blowing brick at the bottom of the ladle according to the inclusion requirements, and the air brick The type determines the argon flow value of manual soft blowing; this method has too high requirements for the ladle used for bottom blowing argon, which is not conducive to the turnover of the ladle in production, and the air permeability of the same ladle is different with different ages; the soft blowing control method in the pouring process It is cumbersome, difficult to operate, and the cost of equipment investment is high

Method used

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  • Continuous casting ladle bottom argon blowing control method for smelting heavy rail steel

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The smelted steel is U71MnG heavy rail steel. The weight of the molten steel after the converter furnace is 142t. After the high vacuum treatment of the molten steel, the flow rate of the argon blowing at the bottom of the ladle is increased after the RH is broken, and the bottom blowing of the ladle is recorded when the slag on the molten steel surface in the ladle breaks The maximum argon gas flow rate is 150NL / min, and then the ladle is transferred to the continuous casting ladle rotary table to be poured at the pouring position; when the previous furnace of molten steel is poured, turn the ladle rotary table to turn the ladle to the steel pouring position, and the ladle Before pouring, the flow rate of argon blowing is controlled to 150NL / min. After observing that the liquid level of the ladle does not fluctuate, cover the ladle, and the ladle begins to pour steel. The speed of ladle pouring steel is 2.63t / min. According to the ladle pouring time, every interval is 3m...

Embodiment 2

[0026] The smelted steel is U71MnG heavy rail steel. The weight of the molten steel after the converter furnace is 140t. After the high vacuum treatment of the molten steel, the flow rate of the argon blowing at the bottom of the ladle is increased after the RH is broken, and the bottom blowing of the ladle is recorded when the slag on the molten steel surface in the ladle breaks The maximum argon gas flow rate is 70NL / min, and then the ladle is transferred to the continuous casting ladle rotary table to be poured. Before pouring, the flow rate of argon blowing is controlled to 70NL / min. After observing that the liquid level of the ladle does not fluctuate, cover the ladle, and the ladle begins to pour steel. The speed of ladle pouring steel is 2.92t / min. Reduce the flow rate of argon blowing once by 10NL / min. The specific flow control of argon gas is shown in Table 1 below. After blowing argon for 15 minutes, close the flow valve of argon gas blowing at the bottom of the ladle...

Embodiment 3

[0029] The smelted steel type is U71MnG heavy rail steel. The weight of the molten steel after the converter is 145t. After the high vacuum treatment of the molten steel, the flow rate of the argon blowing at the bottom of the ladle is increased after the RH is broken, and the bottom blowing of the ladle is recorded when the slag on the molten steel surface in the ladle breaks The maximum argon gas flow rate is 90NL / min, and then the ladle is transferred to the continuous casting ladle rotary table to be poured. Before pouring, control the argon blowing flow rate to 90NL / min. After observing that the liquid level of the ladle does not fluctuate, cover the ladle, and the ladle begins to pour steel. The ladle pouring speed is 2.75t / min. According to the ladle pouring time, every interval is 3min Reduce the flow rate of argon blowing once by 7NL / min. The specific argon flow control is shown in Table 1 below. After blowing argon for 12 minutes, close the flow valve of argon blowing...

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Abstract

The invention relates to a continuous casting ladle bottom argon blowing control method for smelting heavy rail steel. The control method comprises the working procedures of converter smelting, LF refining, RH refining and bloom continuous casting, and the improvement lies in that the maximum flow value of ladle bottom argon blowing is determined according to the surface state of ladle slag after RH refining vacuum breaking, then a ladle is turned to a to-be-cast position of a continuous casting ladle turret for standing, and steel ladle bottom argon blowing is carried out in the steel casting process of the continuous casting steel ladle. The control method has the advantages that by shortening the ladle bottom argon blowing treatment time after RH vacuum breaking, high-efficiency steelmaking production is achieved, 10-18 min can be saved for smelting each furnace of steel, the low argon blowing operation process of the continuous casting ladle is easy and convenient to control, the effect is stable, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to a method for controlling argon blowing at the bottom of a continuous casting ladle for smelting heavy rail steel. Background technique [0002] At present, when the steel for heavy rail is produced in the metallurgical industry, the conventional steelmaking process is molten iron desulfurization pretreatment → converter smelting → LF refining → RH high vacuum treatment + ladle low argon blowing → continuous casting protection casting, the overall smelting cycle is long, and it is difficult to meet the current requirements. Requirements for high-efficiency steelmaking production. [0003] After the high vacuum treatment in the RH process of steelmaking, argon blowing at the bottom of the ladle is usually required for 10 to 18 minutes. The argon blowing process at the bottom of the ladle can strengthen the stirring of the molten pool and accelerate the c...

Claims

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Application Information

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IPC IPC(8): B22D11/117B22D11/18B22D11/113
CPCB22D11/117B22D11/18B22D11/113
Inventor 苗招亮李钧正郭朝军汪鹏侯钢铁韩志杰陈立珂
Owner HANDAN IRON & STEEL GROUP
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