Iron and steel metallurgical compound refining agent

A compound refining agent and iron and steel metallurgy technology, applied in the field of metallurgical refining agents, to achieve the effect of improving kinetics, low equipment investment, and improving mechanical properties

Inactive Publication Date: 2009-09-02
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to use CaSi and CaF for medium frequency induction furnaces for small and medium enterprises 2 , BaO and other powders are reasonably proportioned, and on this basis, an appropriate amount of rare earth elements are added to make a new type of rare earth compound refining agent with a thickness of 0.8 to 3.0mm. There is no clear description in the literature within the above retrieval range.

Method used

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  • Iron and steel metallurgical compound refining agent
  • Iron and steel metallurgical compound refining agent
  • Iron and steel metallurgical compound refining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the raw material weight percentage of refining agent:

[0028] CaO 40%, BaO 20%, CaF 2 10%, MgO 10%, NaAIF 6 5%, NaSiF 6 10%, rare earth 5%.

[0029] The preparation process includes:

[0030] (1) Crushing: Use a crusher to break each raw material into 10-30mm particles;

[0031] (2) Mixing: the crushed raw materials are evenly mixed in a ball mill;

[0032] (3) Sieving: use a 100-mesh sieve to sieve the uniformly mixed raw materials, and control the powder particle size at 0.2-2.0mm;

[0033] (4) Drying: Put the sieved raw materials into an oven and bake to remove moisture. The baking temperature is 80-120°C. The baking time is controlled according to the degree of moisture volatilization. Generally, it is based on experience and visual inspection that no water vapor escapes. allow.

[0034] A 2T intermediate frequency induction furnace is used to smelt 200 series stainless steel, the addition amount is 0.8% of the weight of molten steel, and the ...

Embodiment 2

[0040] Embodiment 2: the raw material weight percentage of refining agent:

[0041]CaO 20%, BaO 30%, CaF 2 15%, MgO 17%, NaAIF 6 5%, NaSiF 6 10%, rare earth 3%. The preparation process is the same as in Example 1.

[0042] Use a steel strip with a thickness of 0.35mm to wrap it into a cored wire of ￠10mm. The weight of the core agent is 120g / m. Smelt ordinary carbon steel in a 500Kg intermediate frequency induction furnace. The core wire is fed into the ladle, and the core wire is added according to 0.5% of the weight of the molten steel. The results are shown in Table 2:

[0043] Table 2 Adding refining agent, wire feeding process test results in ladle

[0044]

Embodiment 3

[0045] Embodiment 3: the raw material weight percent of refining agent:

[0046] CaO 40%, BaO 30%, CaF 2 20%, MgO 8%, other 2%.

[0047] (Note: The other 2% can be NaAIF 6 , NaSiF 6 , any combination or single component of the three raw materials of rare earth).

[0048] The preparation process is the same as in Example 1.

[0049] This scheme smelts ordinary carbon steel in a 1T intermediate frequency induction furnace, and the position where the refining agent powder is added is figure 1 Adding position at ladle B, the test results are shown in Table 3:

[0050] Table 3 Adding refining agent test results

[0051]

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Abstract

The invention is a composite refining agent for iron and steel metallurgy. The raw material weight percentage of the refining agent is: CaO 20-60%, BaO 16-30%, CaF 26-20%, MgO 6-18%, NaAIF 60-6%, NaSiF 60-16% , Rare earth 0-6%. The refining agent is obtained by crushing, mixing, sieving and drying. In order to improve the dephosphorization effect of the refining agent, BaO was used to partially replace CaO, and a certain proportion of rare earth was added to improve the dephosphorization effect of the intermediate frequency furnace; according to the production requirements, the addition amount and the addition process were adjusted to control the kinetic and thermodynamic conditions of the smelting process , so that the refining agent can fully react with the molten steel under controlled conditions to achieve desulfurization, dephosphorization, and improve the shape of inclusions. It is suitable for desulfurization and dephosphorization of ordinary carbon steel, low carbon steel and ultra-low carbon steel.

Description

technical field [0001] The invention relates to a metallurgical refining agent, in particular to an iron and steel metallurgical composite refining agent which achieves deoxidation, desulfurization and dephosphorization during refining molten steel so as to improve the purity of steel. Background technique [0002] In recent years, domestic and foreign research on improving the performance of metallurgical products has increasingly emphasized the control of gases and non-metallic inclusions in molten steel. Studies have shown that the improvement of the purity of molten steel will directly improve the mechanical properties of castings, especially the toughness. Sweden has developed a steel barrel spraying refining method, using inert gas or carrier, powdered refining agent (Ca-Si, CaC 2 , CaO) is sprayed into the molten steel through a spray gun inserted into the molten steel. This method has a good ability to desulfurize, degas and eliminate inclusions. The required equipm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C22C33/04
Inventor 陈巍袁书强张贵才李亚哲刘燕林
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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