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Steel ladle magnesium-containing deoxidizing slag

A technology of waste slag and content, applied in the field of steel containing magnesium deoxidized slag, can solve the problems of affecting the smelting yield of final product performance, limitation, weak deoxidization ability, etc.

Inactive Publication Date: 2011-05-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some limitations are also obvious, such as using silicon as a deoxidizer, its deoxidation ability is very weak, and the deoxidation product is acidic, which affects the sulfur capacity of slag; rare earth and barium as deoxidizers have cost and environmental problems, calcium is a better Reductant, but because its activity is too strong, it must be made into an alloy, and the price is much higher than that of aluminum and magnesium, and its practical application is limited
[0010] Therefore, the existing technology has been unable to solve the steel grades with relatively low aluminum content and relatively narrow content, which may easily cause problems such as missing aluminum components or low purity in the smelting process, affecting the smelting yield and the performance of the final product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Deoxidation of ladle top slag when smelting high-temperature boiler steel pipes in a 120-ton electric furnace.

[0032] The main composition characteristics of high temperature boiler steel pipe are as follows:

[0033] C: 0.10wt%, Si: <0.5wt%, Mn: <0.7wt%, Cr: 11.2wt%, Mo: 0.5wt%,

[0034] Ni: 0.5wt%, W: 2.0wt%, Al: 0.0010-0.005wt%, target Al 0.0030wt%.

[0035] The smelting adopts the electric furnace-ladle refining-round billet continuous casting process.

[0036] The composition analysis of top slag during electric furnace tapping is CaO: 48wt%, SiO 2 : 14wt%, FeO: 14wt%, MnO: 2.6wt%, Al 2 o 3 : 0.8wt%, MgO: 9.2wt%.

[0037] According to visual estimation, the thickness of the ladle top slag layer is 40-60mm, and the estimated weight is about 600 kg.

[0038] The composition of the deoxidized slag used is: Mg: 28wt%, Al: 8wt%, CaO: 36wt%, SiO 2 : 13wt%, MgO: 4wt%, and the rest are impurities or impurities.

[0039] The calculated amount needed to be added is...

Embodiment 2

[0043] Deoxidation of ladle top slag during 300-ton converter smelting structural steel thick plate steel grades.

[0044] The main components and characteristics of the structural steel plate are as follows:

[0045] C: 0.090wt%, Si: 0.25wt%, Mn: <1.61wt%, Cr: <0.2wt%, Cu: 0.2wt%,

[0046] Ni: 0.2wt%, Nb: 0.030wt%, Ti: 0.015wt%, Al: 0.0060-0.0100wt%, target Al 0.0080wt%.

[0047] The smelting adopts converter-ladle refining-slab continuous casting process.

[0048] The component analysis of converter slag during tapping is CaO: 52wt%, SiO 2 : 16wt%, FeO: 17wt%, MnO: 4wt%, Al 2 o 3 : 2wt%, MgO: 7wt%.

[0049] According to visual estimation, the thickness of the ladle top slag layer is 60-80mm, and the estimated weight is about 1500 kg.

[0050] The composition of the deoxidized slag used is: Mg: 14wt%, Al: 2wt%, CaO: 58wt%, SiO 2 : 5wt%, MgO: 4wt%, Al 2 o 3 : 12wt%, and the rest are impurities or impurities.

[0051] The calculated addition amount is 820 kg of deoxid...

Embodiment 3

[0055] Deoxidation of ladle top slag during 300-ton converter smelting structural steel thick plate steel grades.

[0056] The main components and characteristics of the structural steel plate are as follows:

[0057] C: 0.05wt%, Si: 0.21wt%, Mn: 0.85wt%, Cr: <0.2wt%, Cu: 0.4wt%,

[0058] Ni: 0.4wt%, Nb: 0.035wt%, Ti: 0.008wt%, Al: 0.0030-0.0080wt%, target Al: 0.0050wt%.

[0059] The smelting adopts converter-ladle refining-slab continuous casting process.

[0060] The component analysis of converter slag during tapping is CaO: 46wt%, SiO 2 : 18wt%, FeO: 21wt%, MnO: 3wt%, Al 2 o 3 : 6wt%, MgO: 4wt%.

[0061] According to visual estimation, the thickness of the ladle top slag layer is 100mm, and the estimated weight is about 2000kg.

[0062] The composition of the deoxidized slag used is: Mg: 37wt%, CaO: 27wt%, SiO 2 : 6wt%, MgO: 6wt%, Al 2 o 3 : 12wt%, and the rest are impurities or impurities.

[0063] The calculated addition amount is 480 kg of deoxidized slag, and...

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Abstract

The invention discloses steel ladle magnesium-containing deoxidizing slag which is characterized by comprising the following chemical compositions by weight percent: 10-40% of Mg, 30-60% of CaO, 12-30% of SiO2 and Al2O3, more than 0 and less than or equal to 10% of MgO, 0-5% of C and the balance of impurities, wherein the sum of the contents of Mg and CaO is no less than 60wt% of the total weight. According to the invention, the problems of the prior art that for the steel grade with lower aluminium silicate and narrow content range of aluminium silicate, such as on the condition that the target aluminium content of the finished steel is 0.0100wt% or less than 0.0100wt% and the tolerance is only 0.0020-0.0080wt%, the aluminum components can not satisfy the demand in the smelting process or the degree of purity is low so as to affect the yield of smelting and the performances of the final product, can be solved. Therefore, the invention has good popularizing prospect and application prospect.

Description

technical field [0001] The invention relates to a post-furnace deoxidation slag, in particular to a steel containing magnesium deoxidation slag. Background technique [0002] Aluminum is an alloying element widely used in iron and steel materials, and it is also an important deoxidizing element. When aluminum is used as an alloying element, it has numerous metallurgical effects depending on the steel grade. The most common effect of aluminum is grain refinement, and because it significantly increases the toughness of steel and slightly increases the strength of steel, a typical example is hot-rolled sheet. Secondly, aluminum can also improve the oxidation resistance and corrosion resistance of steel. The combination of aluminum, chromium and silicon can significantly improve the high-temperature peeling performance and high-temperature corrosion resistance of steel. For example, about 0.03wt% is generally added to some high-temperature boiler steel pipes (weight percent, t...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C7/06
CPCY02P10/20
Inventor 郑庆马志刚
Owner BAOSHAN IRON & STEEL CO LTD
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