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RH fast decarbonization method

A decarburization and rapid technology, applied in the field of steelmaking, to achieve the effect of efficient and rapid decarburization

Active Publication Date: 2014-10-15
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About the deep decarburization process of ultra-low carbon steel, and the decarburization of C in molten steel to 10×10 within 12 minutes -6 The following RH refining rapid decarburization research has not yet appeared

Method used

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  • RH fast decarbonization method

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Effect test

Embodiment 1

[0038] The flow process of the RH fast decarburization method provided by the invention is:

[0039] Control the end point of the converter, control the temperature at the end point of the converter tapping at 1680°C; calculate by mass percentage, control the C content at the end point of the converter tapping at 0.030%, and control the oxygen content at 558ppm in terms of mass percent; after tapping the converter, enter the RH For refining, the temperature of molten steel entering the station is controlled at 1623°C; to ensure that the RH refining process does not require oxygen blowing operation; the lifting gas flow control during the refining process is: 0 to 3 minutes after the start of vacuuming, the lifting gas flow should be kept at 180m 3 / h; 3 to 9 minutes after the start of vacuuming, the lifting gas flow rate is kept at 150m 3 / h; 9 to 16 minutes after the start of vacuuming, the lifting gas flow rate is kept at 210m 3 / h; 16 minutes after the start of vacuuming-b...

Embodiment 2

[0042] The flow process of the RH fast decarburization method provided by the invention is:

[0043] BOF end point control, the temperature of the BOF tapping end point is controlled at 1680°C; in terms of mass percentage, the C content at the BOF tapping end point is controlled at 0.030%, and in terms of mass percent per million, the oxygen content is controlled at 606ppm; after BOF tapping, enter the RH For refining, the temperature of molten steel entering the station is controlled at 1620°C; to ensure that the RH refining process does not require oxygen blowing operation; the lifting gas flow control during the refining process is: 0 to 3 minutes after the start of vacuuming, the lifting gas flow should be kept at 180m 3 / h; 3 to 9 minutes after the start of vacuuming, the lifting gas flow rate is kept at 150m 3 / h; 9 to 16 minutes after the start of vacuuming, the lifting gas flow rate is kept at 210m 3 / h; 16 minutes after the start of vacuuming-break the air, the lifti...

Embodiment 3

[0046]The flow process of the RH fast decarburization method provided by the invention is:

[0047] BOF end point control, control the temperature at the end point of BOF tapping at 1700°C; calculate by mass percentage, control the C content at 0.035% at the end point of BOF tapping, and control the oxygen content at 558ppm in terms of mass percent; after BOF tapping, enter RH For refining, the temperature of molten steel entering the station is controlled at 1623°C; to ensure that the RH refining process does not require oxygen blowing operation; the lifting gas flow control during the refining process is: 0~3 minutes after the start of vacuuming, the lifting gas flow should be kept at 175m 3 / h; 3 to 9 minutes after the start of vacuuming, the lifting gas flow rate is kept at 145m 3 / h; 9 to 16 minutes after the start of vacuuming, the lifting gas flow rate is kept at 215m 3 / h; 16 minutes after the start of vacuuming-break the air, the lifting gas flow rate is kept at 145m...

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Abstract

The invention relates to an RH fast decarbonization method. The method comprises the following steps: the terminal control of a converter is performed; the temperature of the steel tapping terminal of the converter is controlled within 1675-1705 DEG C; by the mass percentage, the C content at the steel tapping terminal of the converter is controlled within 0.02-0.045%; by the mass percentage, the oxygen content is controlled within 900 ppm; after the steel tapping of the converter is finished, the RH refining is performed; the inlet temperature of molten steel is controlled within 1610-1640 DEG C; an RH judges if the oxygen blowing decarbonization is needed according to the inlet conditions and the carbon-oxygen relation, if so, the oxygen blowing should be performed within 4 min at the beginning of the vacuumizing, and the oxygen blowing quantity is not greater than 150 m3; and the gas flow is increased in the refining process. The method is suitable for the deep decarbonization process of ultralow carbon steel, and can decarbonize the molten steel C below 10*10-6 within 12 min, so that the efficient and fast decarbonization is realized, the RH refining period is shortened, and the temperature drop in the refining process is reduced.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to an RH rapid decarburization method. Background technique [0002] In recent decades, with the growth of clean steel market demand, RH vacuum refining equipment has developed rapidly. On the one hand, the refining process has been continuously developed and improved, forming a modern RH refining process and equipment; on the other hand, RH has been widely popularized in the world. It has become an essential refining equipment for the production of high-quality cold-rolled plates. [0003] The main features of RH refining are: strong refining function, large processing capacity, short cycle, and high cleanliness of molten steel after treatment. About the deep decarburization process of ultra-low carbon steel, and the decarburization of C in molten steel to 10×10 within 12 minutes -6 The following RH refining rapid decarburization research has not yet appeared. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/068C21C7/10
Inventor 唐德池季晨曦崔阳朱国森田志红李永林李一丁赵长亮黄财德
Owner SHOUGANG CORPORATION
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