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Steel-smelting alterant for molten steel refining

A technology of modifier and molten steel, which is applied to blast furnace parts, furnaces, blast furnace details, etc., and can solve problems such as steel instability and steel ingot cracks

Inactive Publication Date: 2006-07-26
谢廷声
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of its active elements, rare earth metals make the processed steel unstable, and sometimes cause many complicated factors such as steel ingot cracks, and are basically not used in steelmaking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The molten steel refining modifier of the present invention is produced by a carbon reduction method in a 3200KVA submerged arc furnace. Table 1 is the set chemical composition (wt%).

[0020] element

Si

Ba

RE

Fe

weight%

50

20

5

margin

[0021] The raw material batch composition of producing 1 ton of molten steel refining modifier of the present invention is shown in Table 2:

[0022] name

Silica

barite

Rare earth concentrate

limestone

steel shavings

coke

quantity

900

300

200

100

100

1500

[0023] The main ingredients contained in the above raw materials:

[0024] 1. Weight percent of rare earth concentrate used: REO 50.06%, Nb 2 O 3 0.75%, MgO 5.05%, CaO 7.05%, Al 2 O 3 6.22%, TiO 2 7.86% etc. 2. Weight % of barite: BaSO 4 6%, SrSO 4 13% etc. 3. Silica wt%: SiO 2 98% etc.

[0025] The chemical composition (w...

Embodiment 2

[0028] The molten steel refining modifier of the present invention is produced by a carbon reduction method in a 3200KVA submerged arc furnace. Table 4 is the set chemical composition (wt%).

[0029] element

Si

Mn

Ba

RE

Al

Fe

quality%

35

15

10

10

10

margin

[0030] The raw material ratio of producing 1 ton of molten steel refining modifier of the present invention is shown in Table 5: kg

[0031] name

Silica

manganese ore

Rare earth concentrate

barite

Bauxite

limestone

steel shavings

coke

quantity

630

460

400

150

200

200

100

1200

[0032] The above raw materials contain main elements: manganese ore contains MnO 2 33%, bauxite containing Al 2 O 3 62%, other raw materials are the same as in Example 1.

[0033] The chemical composition (weight %) of the molten steel re...

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PUM

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Abstract

The invention discloses a composition alloy smelling method in mining heater in carbothermic method, which is characterized by the following: using alkaline earth alloy and rare earth alloy as raw material; adopting purified alterant of steel-smelting molten steel to deoxidize, sulfur removal and dispel harmful substance; making shape of non-metallic inclusion of steel balling, size smaller and adequate distribution. The method improves the mass of steel, which reduces steel-smelting cost by using the invention.

Description

technical field [0001] The invention relates to a molten steel refining modifier for steelmaking, which is a novel multi-component composite ferroalloy prepared by carbon-thermal smelting of alkaline earth metal raw materials and rare earth metal raw materials. Background technique [0002] The output of the iron and steel industry is growing very rapidly, and it is very important to improve the quality of steel. At present, in order to improve the quality of steel, out-of-furnace refining technology is mainly used, but it is limited due to the high cost. Therefore, it is very important and necessary to solve the problem of refining and deterioration of steel. Rare earth metals and alkaline earth metals have strong chemical affinity for oxygen, sulfur and other harmful impurities in steel, and can change non-metallic inclusions in steel, which can greatly improve the quality of steel. Not widely used in steel. Alkaline earth metals such as silicon calcium are used for des...

Claims

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Application Information

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IPC IPC(8): C21B7/00C22C33/04
Inventor 谢廷声
Owner 谢廷声
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