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A method for alloying and uniform molten steel composition in converter tapping

A technology of molten steel composition and steel alloy, applied in the manufacture of converters, etc., can solve problems such as uneven composition of molten steel and loss of its own dynamic conditions

Active Publication Date: 2016-01-20
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can solve the problem that in the traditional method, the molten steel enters the ladle after tapping from the converter and loses its own dynamic conditions, and the composition of the molten steel is uneven, thereby improving the quality of the steel.

Method used

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  • A method for alloying and uniform molten steel composition in converter tapping
  • A method for alloying and uniform molten steel composition in converter tapping
  • A method for alloying and uniform molten steel composition in converter tapping

Examples

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Embodiment 1

[0034] This embodiment is used for refining Q235B type steel, whose standard carbon content is 0.12-0.20% by weight, silicon content is 0.15-0.30% by weight, and manganese content is 0.30-0.70% by weight.

[0035] 140t of semi-steel (its composition is: 3.60% by weight C, 0.032% by weight of Mn, 0.03% by weight of V, 0.010% by weight of S, 0.077% by weight of P, and the balance is Fe) was blended into a 120t converter furnace, and then passed through oxygen The gun blows oxygen into it, and the oxygen supply intensity is 2.86-3.79Nm 3 / t·min. Based on the total amount of oxygen blown in, when the oxygen blowing amount is 21% (the time is about 3 minutes after the start of oxygen blowing, and the total oxygen blowing time is 14 minutes), add the first batch of slagging agents (including composite slagging The agent composition is mainly 50% by weight of SiO 2and 15% by weight of CaO, the composition of the lime slagging agent is mainly 86% by weight of CaO) 4200kg (composite ...

Embodiment 2

[0039] This embodiment is used for refining HRB400 type steel, whose standard carbon content is 0.19-0.25% by weight, silicon content is 0.50-0.80% by weight, manganese content is 1.30-1.60% by weight, and vanadium content is 0.04-0.12% by weight.

[0040] According to the method of embodiment 1, molten steel is produced, and the molten steel obtained after blowing is tapped into a ladle, and the total tapping time is 4-7 minutes. When the tapping amount accounted for 20% by weight of the total tapping amount, 160kg of pitch coke was added, and when the tapping amount accounted for 30% by weight of the total tapping amount, the addition of pitch coke was completed. 1-2 minutes from the completion of adding pitch coke, when the tapping amount accounted for 55% by weight of the total tapping amount, Si-Mn alloy 2700kg, Si-Ca-Ba alloy 300kg, Fe-Si alloy 340kg, V-Fe 95kg of the alloy is added to the ladle, and when the tapping amount accounts for 80% by weight of the total tapping...

Embodiment 3

[0043] This embodiment is used for refining B-shaped steel, whose standard carbon content is 0.17-0.23% by weight, silicon content is 0.17-0.37% by weight, and manganese content is 0.35-0.65% by weight.

[0044] According to the method of embodiment 1, molten steel is produced, and the molten steel obtained after blowing is tapped into a ladle, and the total tapping time is 4-7 minutes. When the tapping amount accounted for 19% by weight of the total tapping amount, 160kg of quasi-graphite was added, and when the tapping amount accounted for 29% by weight of the total tapping amount, the addition of quasi-graphite was completed. Add 1-2 minutes from graphite-like, when tapping amount accounts for 52% by weight of total tapping amount, Si-Mn alloy 570kg, Si-Ca-Ba alloy 300kg, Fe-Si alloy 60kg are added ladle, in When the tapping amount accounts for 75% by weight of the total tapping amount, the addition of the alloy is completed. After adding graphite, when the molten steel in...

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Abstract

The invention relates to a method for converter steel tapping alloying molten steel component evening. The method includes that in the process of steel tapping, alloy and carburant are added into molten steel. The alloy is alloying alloy. The method for the converter steel tapping alloying molten steel evening is characterized in that the alloying alloy is added after the carburant is added. According to the method, the problems that in a traditional method, after a converter is tapped, the molten steel enters a steel ladle to lose the self dynamic condition, and molten steel components are not even are solved, so that steel quality is improved.

Description

technical field [0001] The invention relates to a method for alloying and uniform molten steel composition in converter tapping. Background technique [0002] At present, the steelmaking process in the iron and steel metallurgy industry generally adopts hot metal desulfurization-converter (electric furnace) steelmaking-LF\RH\VD refining-continuous casting. The use of converter steelmaking accounted for about 77%. The steelmaking converter is to mix desulfurized molten iron into the steelmaking converter, and use oxygen with a purity of 99.99% to blow oxygen to the molten iron. The oxygen blowing time is determined according to the oxygen flow rate, and the time is 12-18 minutes. Magnesia lime, slagging agent and other materials to remove impurities (such as P, S) and other elements in molten steel. According to the different uses of the steel, different deoxidizing materials and alloy materials are added during the tapping process, so that the alloy materials are evenly di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30
Inventor 杜利华喻林徐涛龚洪君谭继云熊开伟
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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