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Technological process for secondary refining desulphurization

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

Active Publication Date: 2012-08-29
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

[0024] Transport the steel from the converter to the LF station for refining, temperature measurement and sampling, deoxidation and alloying, and deoxidation treatment by adding aluminum to reach α [O] ≤0.0003%, after the deoxidation is finished, feed the cored wire; stop argon blowing and stirring during the wire feeding process, feed the wire at a speed of 180-350m / min, feed the amount at 50-800m / t, and stand still for 0.1-10min after feeding the wire. Then blow lightly with argon, the flow rate of argon is 50-280Nl / min, the time of weak argon blowing is 0.1-5min, and it is carried out, poured on the machine, and the continuous casting adopts the whole process of protection pouring.

[0025] For the preparation of the cored wire, firstly, the low-melting point pre-melted slag is prepared according to the ratio of CaO 40kg, Al 2 o 3 35kg, SiO 2 10kg, MgO 10kg, CaF 2 Put 5kg into a mixer for uniform mixing, then melt and cool in a magnesia crucible, then crush and roll a...

Embodiment 2

[0027] Transport the steel from the converter to the RH station for refining, temperature measurement and sampling, deoxidation and alloying, and deoxidation treatment by adding aluminum to reach α [O] ≤0.0003%, feed the cored wire after deoxidation, the wire feeding position is on the side of the RH downcomer, the feeding speed is 180-350m / min, the feeding amount is 50-800m / t, and the RH cycle time after feeding the wire is 3 to 10 minutes, break the vacuum after the cycle is over, move it out immediately, and pour it directly on the machine, and the continuous casting adopts the whole process of protective pouring.

[0028] For the preparation of cored wire, first take CaO 10kg, Al 2 o 3 50kg, SiO 2 5kg, MgO 5kg, CaF 2 30kg prepares low-melting point pre-melting slag, its method is the same as embodiment 1; Get its particle diameter again according to formula ratio and be that the prepared low-melting point pre-melting slag 1kg of 1nm~3.5mm, magnesium oxide 98kg, magne...

Embodiment 3

[0030] 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%, feed the cored wire after deoxidation, the wire feeding speed is 200~340m / min, the feeding amount is 50~800m / t, the bottom blowing argon gas is stirred after the wire feeding, and the argon gas stirring intensity is 0~0.004 m 3 / (min·t), the argon blowing time is 0.1~6min, it is moved out, and poured directly on the machine, and the continuous casting adopts the whole process of protective pouring.

[0031] For the preparation of cored wire, first take 70kg of CaO, Al 2 o3 15kg, SiO 2 3kg, MgO2kg, CaF 2 10kg prepares low-melting point pre-melted slag, its method is the same as embodiment 1; Get its particle diameter again and be the mixture 30kg ( The ratio of the two is not strictly required), 10kg of the mixture of calcium oxide and magnesium oxide (the ra...

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Abstract

The invention relates to an external refining technique used for various micro-alloyed steel and special steel, in particular to a technical method used for the external refining desulfurization, which is preferred in the refining desulfurization process of various micro-alloyed steel or the special steel. The technique comprises the following: a. a step of deoxidizing, in which the molten steel is deoxidized to realize that alpha [O] is less than or equal to 0.0003 percent; b. a step of feeding a core-spun yarn, in which the molten steel is refined at the position of LF, RH, VD or CAS-OB, the yarn feeding technique is adopted to feed the core-spun yarn into the molten steel at the positions; and c. a step of continuous casting, in which the continuous casting process is cast protectivelyin the whole process. The a technique shows that the technique has strong decarbolizing ability and the desulfurization degree between 60 and 90 percent by application, realizes that the molten steelis refined and decrabolized to the extent that the content of sulfur is lower than 0.0010 percent, greatly improves the degree of purity and lowers the smelting cost.

Description

technical field [0001] The present invention relates to an out-of-furnace refining process for various micro-alloy steels and special steels, especially a process for out-of-furnace refining desulfurization, which is the first choice for desulfurization in the refining process of various micro-alloy steels or special steels process method. 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 pitti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
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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