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Micro-carbon, low-silicon, low-phosphor and low-sulphur aluminum-magnesium-calcium-iron alloy used for smelting steel and deoxidizing

A ferroalloy, aluminum-magnesium technology, applied in the field of metallurgy, can solve the problems of reducing steel quality, emitting white smoke, and affecting the observation of molten steel conditions, etc., and achieves the effects of high operating rate, easy storage, and considerable social benefits

Inactive Publication Date: 2008-02-13
本溪冶炼集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies, the purpose of the present invention is to provide a micro-carbon, low-silicon, low-phosphorus, low-sulfur aluminum-magnesium-calcium-iron alloy for deoxidation in steelmaking, which solves the problem existing in the prior art in the process of deoxidation in steelmaking. White smoke appears, which affects the observation of the molten steel condition and reduces the quality of the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 (percentage by weight)

[0026] Al 50, Mg 1.5, Ca 5, C 0.018, Si 0.79, P 0.018, S 0.016, Fe balance.

[0027] Use the above alloy as the final deoxidizer for 09CuP steel, add alloys: Mn-Fe, Si-Fe, Si-Mn when the molten steel reaches 1 / 4 of the large tank, and finally add the final deoxidizer in the order of weak, medium, Strong, the final deoxidizer Al-Mg-Ca-Fe alloy is added at the end, and it must be added when the molten steel reaches 3 / 4 of the large tank. The slag must be kept out of the steel, and the steel mouth must be repaired to prevent the slag from entering the large tank and affecting the deoxidation effect. This deoxidizer has a large specificity, good deoxidation effect, high operation rate, low cost and good steel quality.

Embodiment 09

[0028] The chemical composition of the finished product of 09CuP steel type in this embodiment is:

[0029] C (wt%)

Si(wt%)

Mn(wt%)

P (wt%)

S (wt%)

Ca(wt%)

Fe(wt%)

Oxygen content in steel

1.0

0.31

0.45

0.08

0.021

0.30

margin

29.6ppm

[0030] Steel properties:

[0031]

grain size

Yield strength (kg / mm 2 )

tensile strength

(kg / mm 2 )

Elongation (%)

180° cold bending strength

8.5-9.5 level

27

41

27

d=a

[0032] The thickness of 09CuP steel plate is 2.5mm, and the amount of deoxidizer added is 0.7kg / t.

[0033] In the above table, d represents the diameter of the bending center, and a represents the thickness of the sample.

Embodiment 2

[0035] Difference with embodiment 1 is: (percentage by weight)

[0036] Al 30, Mg 0.1, Ca 5, C 0.011, Si 0.90, P 0.010, S 0.017, Fe balance

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PUM

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Abstract

The invention discloses an aluminum magnesium calcium ferroalloy with micro-carbon, low silicon, low phosphorus and low sulfur used in steelmaking deoxidization, which is characterized in that the weight percent of the invention is 10 to 98 Al, 0.1 to 5 Mg and 0.5 to 65 Ca; C is no more than 0.02; Si is no more than1.0; P is no more than 0.02; S is less than 0.02 and the rest is Fe. The invention is to provide the aluminum magnesium calcium in ferro with micro-carbon, low silicon, low phosphorus and low sulfur used in steelmaking deoxidization to solve the problem existing in prior art that white smoke bursts during the process of steelmaking deoxidization, which affects observation of liquid steel and lowers the steel quality.

Description

technical field [0001] The invention relates to a ferroalloy for steelmaking in the field of metallurgy, in particular to a micro-carbon, low-silicon, low-phosphorus and low-sulfur aluminum-magnesium-calcium-iron alloy for steelmaking. Background technique [0002] Calcium-silicon and silicon-aluminum-iron alloys are used as final deoxidizers for steelmaking, and their effects have been recognized. The composite deoxidizers for steelmaking that have appeared in recent years generally contain silicon. Although such silicon-containing deoxidizers have better deoxidizing effects, However, it is used for smelting steels that require good toughness. When the silicon content in the steel is high, the toughness of the steel will be reduced. There are many low-carbon, low-silicon, low-phosphorus, and low-sulfur steels that are urgently needed in the market. The smelting rate of such steels is very low due to the influence of deoxidizers, and the company's profits suffer a lot. To s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 李兴有
Owner 本溪冶炼集团有限公司
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