Multifunctional composite refining agent for steel-smelting

A compound refining agent and alloy technology, which is used in the refining agent for steelmaking and the field of refining molten steel when the converter process smelts high-quality molten steel, can solve the inconvenience of production operation and management, the single function of the refining agent, and it is difficult to play a large role, etc. problem, to achieve the effect of avoiding secondary oxidation and low cost

Inactive Publication Date: 2008-05-14
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process reduces the FeO in the ladle slag, the S content in the finished steel reaches 0.005%-0.0012% (0.009% on average), and the T[O] content reaches 15×10 -6 ~34×10 -6 (average 24×10 -6 ) level, but submerged arc slag and refining agent are required to be used together during production, which is extremely inconvenient

Method used

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  • Multifunctional composite refining agent for steel-smelting

Examples

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Effect test

Embodiment 1

[0023] The preparation of embodiment 1 refining agent of the present invention

[0024] Raw material: (by weight percentage)

[0025] CaO: 30%, CaC 2 : 5%, SiC: 10%, Na 2 CO 3 : 5%, CaCO 3 : 15%, C: 10%, CaF 2 : 15%, BaCaSi: 10%.

[0026]Preparation method: Crush various raw materials to 2-8mm respectively, weigh each raw material according to the proportion, put the weighed raw materials into a type mixing mixer, stir and mix for 20-30 minutes, and then pack into 20kg / bag Double-layer woven bag lined with plastic film. It should be protected from moisture and fire during transportation and storage.

[0027] ∑CaO / ∑SiO of the above-mentioned compound refining agent for steelmaking 2 It is 3.5, and its melting point is 1390°C.

[0028] The method of adding the compound refining agent for steelmaking is as follows: 2-4 kg / t steel of refining agent is added to the ladle during the tapping process of the converter, and 1-5 kg / t steel of the refining agent is added into the...

Embodiment 2

[0029] The preparation of embodiment 2 refining agent of the present invention

[0030] Raw material: (by weight percentage)

[0031] CaO: 40%, CaC 2 : 10%, SiC: 10%, Na 2 CO 3 : 10%, CaCO 3 : 8%, C: 5%, CaF 2 : 15%, BaCaSi: 2%.

[0032] The preparation method is the same as in Example 1.

[0033] ∑CaO / ∑SiO of the above-mentioned compound refining agent for steelmaking 2 It is 4.0, and its melting point is 1360°C.

[0034] The method of adding the compound refining agent for steelmaking is as follows: 2-4 kg / t steel of refining agent is added to the ladle during the tapping process of the converter, and 1-5 kg / t steel of the refining agent is added into the ladle during the refining process of the LF furnace.

Embodiment 3

[0035] Embodiment 3 Preparation of refining agent of the present invention

[0036] Raw material: (by weight percentage)

[0037] CaO: 52%, CaC 2 : 5%, SiC: 8%, Na 2 CO 3 : 12%, CaCO 3 : 5%, C: 5%, CaF 2 : 9%, BaCaSi: 4%.

[0038] The preparation method is the same as in Example 1.

[0039] ∑CaO / ∑SiO of the above-mentioned compound refining agent for steelmaking 2 It is 5.5, and its melting point is 1370°C.

[0040] The method of adding the compound refining agent for steelmaking is as follows: 2-4 kg / t steel of refining agent is added to the ladle during the tapping process of the converter, and 1-5 kg / t steel of the refining agent is added into the ladle during the refining process of the LF furnace.

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Abstract

The invention provides a multi-functional refining agent which can effectively control inclusion in steel. The refining agent consists of CaO, CaC2, SiC, Na2CO3, C, CaF2 and BaCaSi alloy, wherein the weight percentage of the refining agent is: 30-60 percent of the CaO: 5-15 percent of the CaC2: 5-15 percent of the SiC: 5-15 percent of the Na2CO3: 5-15 percent of the CaCO3: 5-15 percent of the CaF2: 2-10 percent of the BaCaSi: 2-10 percent of the C; the melting point is less than or equal to 1400 DEG C. The refining agent has the functions of wiping off the inclusion in the steel, expanding foam for submerged arc and removing sulfur. After being matched with the complex refining agent, the T(O) in finished steel is declined to the range of 5 multiplied by 10<-6> to 15 multiplied by 10<-6>, and the evaluation grade of the inclusion of B, C and D class is less than 1.0 grade with good sulfur removal effect as well.

Description

technical field [0001] The invention relates to a refining agent for steelmaking, which belongs to the field of refining molten steel outside a furnace, in particular to refining molten steel when high-quality molten steel is smelted by a converter process. Background technique [0002] Because the oxygen blowing operation in the furnace during converter steelmaking will cause a large amount of Fe in molten steel to be oxidized into FeO, which will lead to a substantial increase in FeO in converter slag, and a large amount of converter slag will inevitably be brought into the ladle during converter steelmaking , and finally make the FeO of ladle slag in a higher range. Ladle slag with high FeO content has the ability to transfer oxygen to molten steel again, increasing the total oxygen content of molten steel and deteriorating the quality of molten steel. At the same time, in the deoxidation alloying of medium and high carbon steel, a large amount of Si-containing alloys su...

Claims

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Application Information

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IPC IPC(8): C21C7/04C21C7/06C21C7/064
Inventor 曾建华李桂军陈永杨素波黎光正
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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