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Argon blowing method of ladle turret and steel ladle argon blowing turret in continuous casting mode

A technology of turret table and ladle, which is applied in casting equipment, casting melt containers, manufacturing tools, etc., can solve the problems of maintaining the continuity of steelmaking production, improving the oxidation of molten steel, and high consumption of metal materials, so as to ensure the continuity of production, Effects of cost reduction and quality assurance

Active Publication Date: 2018-11-16
德龙钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, the soft blowing time is guaranteed to improve the quality of molten steel (the longer the argon blowing time under a reasonable soft blowing argon gas flow condition, the removal of inclusions in the steel is about complete), after the blowing of the next furnace of molten steel is completed , the last furnace of molten steel has not yet left the station, causing production problems in subsequent tapping and other ladles
Due to the limitation of the argon blowing time of the argon station, the argon blowing process of the argon station usually adopts a combination of hard blowing and soft blowing, which requires a higher tapping temperature of the converter to ensure that the temperature before the argon meets the requirements of the argon blowing time. The steel temperature has caused the disadvantages of increased oxidation of molten steel and high consumption of metal materials
Therefore, in order to improve the quality of molten steel, adopting a longer argon blowing time and maintaining the continuity of steelmaking production have become a pair of insoluble contradictions

Method used

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  • Argon blowing method of ladle turret and steel ladle argon blowing turret in continuous casting mode
  • Argon blowing method of ladle turret and steel ladle argon blowing turret in continuous casting mode
  • Argon blowing method of ladle turret and steel ladle argon blowing turret in continuous casting mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]The target steel grade is cold-rolled base material Q195, furnace number: 81-03033, molten iron temperature 1366°C, molten iron composition: C: 4.59%, Si: 0.36%; Mn: 0.33%; S: 0.023%; P: 0.102%, the oxygen supply time is 13 minutes and 32 seconds. Steel core aluminum and silicon-manganese alloy are used for tapping and alloying (the Al purity in the steel core aluminum is >99%, and the Al content is 70%; the Mn content of the silicon-manganese alloy is 66%).

[0032] The temperature measurement at the end point of the converter molten steel is 1629°C, and the sampling composition at the end point is: C: 0.042%, Mn: 0.10%, S: 0.016%, P: 0.015%. The end point composition and temperature are suitable. Once the steel is poured out, 350Kg of steel core aluminum and 230Kg of silicon-manganese alloy are added through the high-level feed bin when the steel is tapped for 1 / 2. When the steel is tapped, the ladle is turned on with argon gas throughout the process, and the atmosphe...

Embodiment 2

[0036] The target steel type is cold rolling base material Q195L, furnace number: 82-03093, molten iron temperature 1385°C, molten iron composition: C: 4.55%, Si: 0.34%; Mn: 0.32%; S: 0.020%; P: 0.115%, the oxygen supply time is 13 minutes and 16 seconds. Steel core aluminum and silicon-manganese alloy are used for tapping and alloying (the Al purity in the steel core aluminum is >99%, and the Al content is 70%; the Mn content of the silicon-manganese alloy is 66%).

[0037] The temperature measurement at the end point of the converter molten steel is 1628°C, and the sampling composition at the end point: C: 0.041%, Mn: 0.09%, S: 0.015%, P: 0.017%. The end point composition and temperature are suitable. Once the steel is poured out, 1 / 2 of the steel is tapped, and 365Kg of steel core aluminum and 240Kg of silicon-manganese alloy are added through the high-level feed bin. When the steel is tapped, the ladle is turned on with argon gas throughout the process, and the atmosphere...

Embodiment 3

[0042] Taking cold-rolled base material SPHC as the target steel type, furnace number: 81-03196, molten iron temperature 1380°C, molten iron composition: C: 4.57%, Si: 0.36%; Mn: 0.30%; S: 0.021%; P: 0.105%, the oxygen supply time is 12 minutes and 57 seconds. Steel core aluminum and medium carbon ferromanganese alloy are used for tapping and alloying (the Al purity in the steel core aluminum is >99%, and the Al content is 70%; the medium carbon ferromanganese Mn content is 74%).

[0043] The temperature measurement at the end point of the converter molten steel is 1625°C, and the sampling composition at the end point is: C: 0.038%, Mn: 0.08%, S: 0.017%, P: 0.015%. The end point composition and temperature are suitable. Once the steel is poured out, 386Kg of steel core aluminum and 270Kg of medium carbon ferromanganese are added through the high-level feed bin when the steel is tapped for 1 / 2. When the steel is tapped, the ladle is turned on with argon gas throughout the proc...

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Abstract

The invention provides an argon blowing method of a ladle turret and a steel ladle argon blowing turret in continuous casting mode. The method comprises the following steps that a, molten steel tapping is carried out, specifically the molten steel tapping temperature of the converter procedure is controlled between 1620 DEG C and 1630 DEG C; b, argon station on oxygen feeding aluminium wire is carried out, specifically a steel ladle is moved to an argon station, the argon front temperature of molten steel is controlled between 1600 DEG C and 1610 DEG C; c, argon station stirring is carried out, specifically the molten steel is stirred for 3-4 min in the argon station after the molten steel on oxygen and feeding wire, the outgoing temperature of the molten steel is controlled between 1595 DEG C and 1600 DEG C; and d, steel ladle argon blowing is carried out, specifically the steel ladle is lifted and conveyed to a continuous casting machine steel ladle argon blowing turret, argon gas isput into a blowpipe of the steel ladle bottom, argon gas argon blowing is open, and the soft argon blowing time is controlled between 15 min and 20 min. The process of the steel ladle argon blowing is moved to the continuous casting turret for implementation, the contradictory problem that the molten steel argon blowing time and the production rhythm is solved. While the production continuity isensured, the purity degree of the molten steel and the yielding rate of alloy are improved, and it is ensured that the quality of the purity degree of the molten steel is met.

Description

technical field [0001] The invention relates to a steelmaking technology, in particular to a method for controlling argon blowing at the bottom of a ladle on a rotary table in a continuous casting mode. Background technique [0002] At present, in the steelmaking production process, the slag washing process has gradually replaced the refining process as the most convenient means of refining to obtain clean steel. In order to ensure the purity, uniformity of temperature and composition of the molten steel directly on the slag washing, when performing this process, the molten steel starts to blow argon after adjusting the composition and temperature. Generally, the argon blowing time of the molten steel at the argon station should be controlled between 10-12min, otherwise There will be an impact on production continuity. In some cases, the soft blowing time is guaranteed to improve the quality of molten steel (the longer the argon blowing time under a reasonable soft blowing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117B22D41/13C21C7/06C21C7/068C22C38/02C22C38/04C22C38/06C21C7/00
CPCB22D11/117B22D41/13C21C7/0006C21C7/0056C21C7/06C21C7/068C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 李兴才霍立桥田宝生胥俊超徐子谦马军强屈芙渠赵伟锋武献民刘建刚王鹏
Owner 德龙钢铁有限公司
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