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A rapid decarburization method of rh

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

Active Publication Date: 2016-03-02
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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  • A rapid decarburization method of rh

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The process of the RH rapid decarbonization method provided by the present invention is:

[0039] The converter end point control, the converter tapping end temperature is controlled at 1680℃; calculated by mass percentage, the converter tapping end C content is controlled at 0.030%, and the oxygen content is controlled at 558ppm by mass per million; the converter enters RH after tapping. For refining, the temperature of molten steel entering the station is controlled at 1623℃; to ensure that oxygen blowing is not required during the RH refining process; the lifting gas flow control during the refining process is: 0~3min after the start of vacuum, the lifting gas flow should be kept at 180m 3 / h; 3~9min after the start of vacuuming, the lifting gas flow is kept at 150m 3 / h; 9~16min after the start of vacuuming, the lifting gas flow rate is maintained at 210m 3 / h; 16min-breaking after the vacuuming starts, and the lifting gas flow rate is maintained at 150m 3 / h; 12 to 14 m...

Embodiment 2

[0042] The process of the RH rapid decarbonization method provided by the present invention is:

[0043] The converter end point control, the converter tapping end temperature is controlled at 1680℃; calculated by mass percentage, the converter tapping end point C content is controlled at 0.030%, by mass per million, the oxygen content is controlled at 606ppm; after the converter tapping, it enters RH For refining, the temperature of molten steel entering the station is controlled at 1620℃; to ensure that no oxygen blowing operation is required during the RH refining process; the lifting gas flow control during the refining process is: 0~3min after the start of vacuuming, and the lifting gas flow should be kept at 180m 3 / h; 3~9min after the start of vacuuming, the lifting gas flow is kept at 150m 3 / h; 9~16min after the start of vacuuming, the lifting gas flow rate is maintained at 210m 3 / h; 16min-breaking after the vacuuming starts, and the lifting gas flow rate is maintained at...

Embodiment 3

[0046] The process of the RH rapid decarbonization method provided by the present invention is:

[0047] The converter end point control, the converter tapping end temperature is controlled at 1700℃; calculated by mass percentage, the converter tapping end point C content is controlled at 0.035%, and the oxygen content is controlled at 558ppm by mass percentage; after the converter tapping, it enters RH For refining, the temperature of molten steel entering the station is controlled at 1623℃; to ensure that oxygen blowing is not required during the RH refining process; the lifting gas flow control during the refining process is: 0~3min after the start of vacuuming, and the lifting gas flow should be kept at 175m 3 / h; 3~9min after the start of vacuuming, the lifting gas flow rate is maintained at 145m 3 / h; 9~16min after the start of vacuuming, the lifting gas flow rate is maintained at 215m 3 / h; 16min-breaking after the vacuuming starts, and the lifting gas flow rate is maintaine...

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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 a RH rapid decarburization method. Background technique [0002] In recent decades, with the growth of market demand for clean steel, RH vacuum refining equipment has developed rapidly. On the one hand, the refining process has been continuously developed and improved to form modern RH refining processes and equipment; on the other hand, RH has been widely popularized worldwide. Become an indispensable refining equipment for the production of high-quality cold-rolled plates. [0003] The main characteristics of RH refining are: strong refining function, large processing capacity, short cycle, and high cleanliness of molten steel after processing. Regarding the deep decarburization process of ultra-low carbon steel, and making the C in the molten steel desorbed to 10×10 within 12 minutes -6 The following RH refining and rapid decarburization methods have not yet appeared. Summary o...

Claims

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Application Information

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Patent Type & Authority Patents(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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