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RH vacuum decarburization method

A vacuum decarburization and vacuum chamber technology, applied in the field of molten steel refining, can solve problems such as long production cycle, low production efficiency, and slow decarburization rate

Inactive Publication Date: 2020-04-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a method for RH vacuum decarburization to solve the problems of slow decarburization rate in the middle and later stages of RH decarburization in the prior art, resulting in long production cycle and low production efficiency

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1 provides a RH vacuum decarburization method, the smelted steel is common IF steel, and the finished product target C≤30ppm, the method includes,

[0061] S1, placing the ladle containing molten steel in the RH refining station, and evacuating the vacuum chamber; the mass fraction of C in the molten steel is 0.035%.

[0062] S2, once blowing Ar gas into the riser; when starting to blow an inert gas into the riser, the vacuum degree of the vacuum chamber is 58000Pa.

[0063] Further, the flow rate of Ar gas blown into once is 2500 L / min, and the time of Ar gas blown into once is 2 min.

[0064] S3, finish blowing Ar gas into the riser once; when finish blowing inert gas into the riser once, the vacuum degree of the vacuum chamber is 12000Pa.

[0065] S4, blowing Ar gas into the riser; the flow rate of the blowing Ar gas is 3500 L / min, and the time of blowing Ar gas is 3 min.

[0066] S5, finishing blowing Ar gas into the riser; when finishing blowing Ar gas...

Embodiment 2

[0077] Embodiment 2 provides a RH vacuum decarburization method, the smelted steel is common IF steel, and the finished product target C≤30ppm, the method includes,

[0078] S1, placing the ladle containing molten steel in the RH refining station, and evacuating the vacuum chamber; the mass fraction of C in the molten steel is 0.030%.

[0079] S2, once blowing Ar gas into the riser; when starting to blow an inert gas into the riser, the vacuum degree of the vacuum chamber is 60000Pa.

[0080] Further, the flow rate of the once blown Ar gas is 2000 L / min, and the time of the once blown Ar gas is 2.5 min.

[0081] S3, finish blowing Ar gas into the riser once; when finish blowing inert gas into the riser once, the vacuum degree of the vacuum chamber is 10000Pa.

[0082] S4, blowing Ar gas into the riser; the flow rate of the blowing Ar gas is 3000 L / min, and the time of blowing Ar gas is 2.5 min.

[0083] S5, finishing blowing Ar gas into the riser; when finishing blowing Ar g...

Embodiment 3

[0094] Embodiment 3 provides a RH vacuum decarburization method, the smelted steel is very low carbon IF steel, and the finished product target C≤13ppm, the method includes,

[0095] S1, placing the ladle containing molten steel in the RH refining station, and evacuating the vacuum chamber; the mass fraction of C in the molten steel is 0.038%.

[0096] S2, blowing Ar gas into the riser once; when starting to blow inert gas once into the riser, the vacuum degree of the vacuum chamber is 55000Pa.

[0097] Further, the flow rate of the Ar gas blown once is 3000 L / min, and the Ar gas blown time is 2 min.

[0098] S3, finish blowing Ar gas into the riser once; when finish blowing inert gas into the riser once, the vacuum degree of the vacuum chamber is 11000Pa.

[0099] S4, blowing Ar gas into the riser; the flow rate of the blowing Ar gas is 4000 L / min, and the blowing time of the Ar gas is 3 min.

[0100] S5, finishing blowing Ar gas into the riser; when finishing blowing Ar ga...

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Abstract

The invention discloses an RH vacuum decarburization method which comprises the following steps of placing a steel ladle containing molten steel at an RH refining station, and vacuumizing a vacuum chamber; blowing in inert gas into an ascending pipe; stopping blowing of the inert gas into the ascending pipe; blowing in CO2 gas into the ascending pipe, and meanwhile blowing in CO2 gas into the bottom of the steel ladle, wherein the flow rate of the CO2 gas blown into the ascending pipe is 1100-2600 L / min, and the flow rate of the CO2 gas blown into the bottom of the steel ladle is 100-1000 L / min; stopping blowing of the CO2 gas into the ascending pipe, and meanwhile, stopping blowing of the CO2 gas into the bottom of the steel ladle; blowing in the inert gas into the ascending pipe; stopping blowing of the inert gas into the ascending pipe, conducting vacuum breaking, and obtaining qualified molten steel. The RH vacuum decarburization method has the advantages of short decarburization time, high production efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of molten steel refining, in particular to an RH vacuum decarburization method. Background technique [0002] In the smelting process of ultra-low carbon steel, RH is an important refining equipment outside the furnace. The RH refining process is carried out under a low pressure and close to vacuum state, and the molten steel circulates in a close to vacuum state, which not only makes the inclusions in the steel easy to float up and remove, but also removes a large amount of carbon from the molten steel through the carbon-oxygen reaction. To achieve the purpose of smelting ultra-low carbon or extremely low carbon steel. RH refining usually uses inert gas as lifting gas, because inert gas has the characteristics of not chemically reacting with elements in molten steel and will not affect the quality of molten steel. However, for the middle and late stages of the decarburization process of ultra-low carbon s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068C21C7/06
CPCC21C7/06C21C7/068C21C7/10
Inventor 刘柏松李海波朱国森陈斌邓小旋邵肖静张宏艳季晨曦刘国梁罗衍昭董文亮尹娜
Owner SHOUGANG CORPORATION