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Technique for outside-stove refining dephosphorization

A process method and an out-of-furnace refining technology, applied in the field of out-of-furnace refining desulfurization, can solve problems such as unfavorable lime powder desulfurization effect, achieve strong desulfurization ability, improve utilization rate, and scientific and reasonable preparation

Active Publication Date: 2008-12-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result is not conducive to the desulfurization effect of lime powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Transport the steel from the converter to the CAS-OB station for refining, temperature measurement and sampling, deoxidation and alloying, and deoxidation treatment by adding aluminum to reach α [O] ≤0.0003%, move out. Adjust the position of the RH descending pipe and the feeding pipe so that they are on the opposite side of the feeding pipe, transport the ladle to the RH station, measure the temperature and take samples, the actual temperature of the molten steel during the refining process is 5-25°C higher than that required for general refining , Vacuumize, adjust ingredients, net circulation. When the vacuum degree of the RH vacuum chamber is 66.7-500Pa, put the composite sphere from the RH alloy silo, the diameter of the composite sphere is 10-60mm, the amount of the composite sphere is 0.5-3.5kg / t, and the single addition is 50- 130kg, the interval between two additions is 0-5 minutes, after the composite sphere is put in, the cycle is 0.1-15 minutes, the vacuum ...

Embodiment 2

[0021] Transport the steel from the converter to the LF station for refining, temperature measurement and sampling, deoxidation and alloying, and the molten steel is deoxidized by adding aluminum to reach α [O] ≤0.0003%. Adjust the position of the RH descending pipe and the feeding pipe so that they are on the opposite side of the feeding pipe, transport the ladle to the RH station, measure the temperature and take samples, the actual temperature of the molten steel during the refining process is 5-25°C higher than that required for general refining , Vacuumize, adjust ingredients, net circulation. When the vacuum degree of the RH vacuum chamber is 66.7-500Pa, put the composite sphere from the RH alloy silo, the diameter of the composite sphere is 10-60mm, the amount of the composite sphere is 0.5-3.5kg / t, and the single addition is 50- 130kg, the interval between two additions is 0 to 5 minutes, and the cycle is 0.1 to 15 minutes after the composite sphere is put in, and it ...

Embodiment 3

[0024] Adjust the position of the RH descending pipe and the feeding pipe so that they are on the opposite side of the feeding pipe. Transport the ladle to the RH station, measure temperature and take samples. The actual temperature of molten steel in the refining process is 5-25°C higher than that required for general refining. Vacuumize, deoxidize and alloy, and use aluminum for deoxidation treatment to reach α [O] ≤0.0003%, net circulation. When the vacuum degree of the RH vacuum chamber is 66.7-500Pa, put the composite sphere from the RH alloy silo, the diameter of the composite sphere is 10-60mm, the amount of the composite sphere is 0.5-3.5kg / t, and the single addition is 50- 130kg, the interval between two additions is 0 to 5 minutes, and the cycle is 0.1 to 15 minutes after the composite sphere is put in; the vacuum is broken, and the casting is carried out on the machine, and the continuous casting adopts the whole process of protective pouring.

[0025]For the prepa...

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Abstract

The invention relates to an external refining process for various microalloy steel and special steel, in particular to a process method for external refining desulphurization, which is the preferred process method for desulphurization during the refining processes of various microalloy steel or special steel. The process comprises the following steps of: a. deoxidation: molten steel is firstly subjected to deoxidation treatment to realize that alpha[O] is less than or equal to 0.0003 percent; b. the adjustment of a RH station: the positions of a RH descending tube and a blanking tube are adjusted to ensure that the RH descending tube is positioned at the opposite side of the blanking tube; c. the adding of compound spheres: after a ladle is transported to the RH station, the compound spheres are added into the molten steel at the RH station after temperature measurement sampling, vacuum pumping, clean recycle and refining are finished; and d. continuous casting: the continuous casting adopts the whole-process protection. Proven by application, the process has strong desulphurization ability with a desulphurization rate between 60 and 90 percent, can realize the refining desulphurization of the molten steel until the content of sulfur is lower than 0.0010 percent, greatly improves the purity of the molten steel, and reduces smelting cost.

Description

technical field [0001] The present invention relates to an out-of-furnace refining process for various microalloy steels and special steels, in particular to an out-of-furnace refining desulfurization process, which is the preferred process for desulfurization in the refining process of various microalloy steels or special steels . Background technique [0002] Generally speaking, except for individual steel types such as free-cutting steel, sulfur is a harmful element in steel, which forms sulfide inclusions in steel and reduces the ductility and toughness of steel, especially impact toughness. When sulfur exists in the form of iron sulfide, it will cause hot embrittlement. At the same time, the corrosion resistance of steel with high sulfur content will be greatly reduced, which is also unfavorable to the welding performance of steel. Sulfide stress corrosion cracking (SSCC) can occur in austenitic stainless steel through pitting corrosion, and the source of pitting corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
CPCY02P10/20
Inventor 唐复平王晓峰刘万山孟劲松任子平李德刚陈本文王仁贵张军王文仲李镇张晓军孙群栗红
Owner ANGANG STEEL CO LTD
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