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Mold slag for continuous casting of high titanium alloy welding wire steel and preparation method thereof

A technology of titanium alloy and mold slag, which is applied in the field of iron and steel smelting and continuous casting, can solve the problems of poor surface quality of slab, high scrap rate, viscosity of mold slag, and rising melting point, so as to prolong the service life of equipment and prevent steel Oxidation, Lubricating Effects of Steel Oxidation

Inactive Publication Date: 2016-01-20
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]The continuous casting technology has been highly valued by the metallurgical industry for its high efficiency, energy saving, high quality, easy automation and intelligence, and many other advantages. Mold slag has also been developed accordingly, and has become an indispensable metallurgical auxiliary material; for high-titanium alloy welding wire steel, the control range of Ti is generally required to be 0.10-0.25%, the droplet is refined during welding, the arc is stable, and the spatter However, this kind of high-titanium alloy welding wire steel has special requirements for mold slag during continuous casting. The steel contains high titanium content, and titanium is a strong deoxidizer that is easy to oxidize. It is easy to oxidize to form substances with high melting point such as TiO2, which will cause denaturation of the mold flux, sharply increase the viscosity and melting point of the mold flux, deteriorate the crystallization performance of the mold flux, and easily become flocculent or agglomerated, rich in Collected on the surface of the slab, the slab is prone to slag inclusions, sticky slag, scarring and slag pits, and the surface quality of the slab is poor, resulting in high scrap rates and high cleaning costs in the later stage. The mold slag in the prior art basically uses carbon However, at the continuous casting temperature, carbon cannot be oxidized prior to Ti. Therefore, the carbon in mold slag cannot reduce and control the oxidation of Ti in high-titanium alloy steel. In addition, the existing mold slag has high alkalinity, The stable range of melting performance is narrow. Once Ti is oxidized, it is easy to cause the glass performance of mold slag to disappear, and the lubricating effect and anti-oxidation effect are sharply reduced or disappeared. Mold flux for continuous casting mold with properties to control Ti oxidation

Method used

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  • Mold slag for continuous casting of high titanium alloy welding wire steel and preparation method thereof
  • Mold slag for continuous casting of high titanium alloy welding wire steel and preparation method thereof
  • Mold slag for continuous casting of high titanium alloy welding wire steel and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Lime (CaO), silica (SiO 2 ), boric anhydride (B 2 o 3 ), lithium oxide (Li 2 O), calcium carbide (CaC 2 ) as raw materials, lime, silica, boric anhydride, and lithium oxide should be fully dried and dehydrated at 200 ° C, ground into fine powder, weighed ingredients, pre-melted at 1300 ° C, cooled and ground in a mill to pass 200 mesh Sieve (particle size less than 0.074mm), make hollow particles in the spray granulation tower, which is the semi-finished product of the mold powder, crush and sieve the calcium carbide powder to 100 mesh, and mix it in according to the mass fraction to obtain the finished mold powder. The particle size range is 0.1-0.4mm.

[0023] The composition analysis results of the prepared mold flux are as follows (mass percentage):

[0024] CaO44%, SiO 2 48%, B 2 o 3 3%, Li 2 O2%, CaC 2 2%, the balance is impurities, of which S0.02%, P0.02%.

[0025] The main physical and chemical performance indicators of this embodiment are shown in Ta...

Embodiment 2

[0027] Lime (CaO), silica (SiO 2 ), boric anhydride (B 2 o 3 ), lithium oxide (Li 2 O), calcium carbide (CaC 2 ) as raw materials, lime, silica, boric anhydride, and lithium oxide should be fully dried and dehydrated at 200 ° C, ground into fine powder, weighed ingredients, pre-melted at 1300 ° C, cooled and ground in a mill to pass 200 mesh Sieve (particle size less than 0.074mm), make hollow particles in the spray granulation tower, which is the semi-finished product of the mold powder, crush and sieve the calcium carbide powder to 100 mesh, and mix it in according to the mass fraction to obtain the finished mold powder. The particle size range is 0.1-0.4mm.

[0028] The composition analysis results of the prepared mold flux are as follows (mass percentage):

[0029] CaO50%, SiO 2 40%, B 2 o 3 2%, Li 2 O2%, CaC 2 5%, the balance is impurities, of which S0.02%, P0.02%.

[0030] The main physical and chemical performance indicators of this embodiment are shown in Ta...

Embodiment 3

[0032] Lime (CaO), silica (SiO 2 ), boric anhydride (B 2 o 3 ), lithium oxide (Li 2 O), calcium carbide (CaC 2 ) as raw materials, lime, silica, boric anhydride, and lithium oxide should be fully dried and dehydrated at 200 ° C, ground into fine powder, weighed ingredients, pre-melted at 1300 ° C, cooled and ground in a mill to pass 200 mesh Sieve (particle size less than 0.074mm), make hollow particles in the spray granulation tower, which is the semi-finished product of the mold powder, crush and sieve the calcium carbide powder to 100 mesh, and mix it in according to the mass fraction to obtain the finished mold powder. The particle size range is 0.1-0.4mm.

[0033] The composition analysis results of the prepared mold flux are as follows (mass percentage):

[0034] CaO35%, SiO 2 50%, B 2 o 3 1%, Li 2 O3%, CaC 2 10%, the balance is impurities, of which S0.02%, P0.02%.

[0035] The main physical and chemical performance indicators of this embodiment are shown in Tab...

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Abstract

The invention belongs to the technical field of iron and steel smelting and continuous casting production, and particularly relates to a mold powder for continuous casting of steel for high titanium alloy welding wire and a preparation method thereof. The components are calculated as: CaO? 30-50%, SiO2? 40-60%, B2O3? 2-5%, Li2O? 2-5%, CaC2? 2-10%, unavoidable impurities? 0-2%, S≤0.03% in impurities, P≤0.03%. The mold slag of the present invention has a lower melting temperature, low alkalinity, good lubrication and anti-oxidation effects of glass slag, especially good anti-oxidation and gas absorption effects of steel, and is especially suitable for high-titanium alloy welding wire steel Continuous casting can effectively prevent the oxidation of Ti and other alloy elements in high-titanium alloy steel, and can effectively prevent the influence of titanium oxide produced after Ti oxidation on the deterioration of mold slag performance and use effect, and prevent mold slag crusting in the mold, which is obvious Improve the lubrication effect and improve the quality of the slab.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting and continuous casting production, and in particular relates to a mold powder for continuous casting of steel for high titanium alloy welding wire and a preparation method thereof. Background technique [0002] The continuous casting technology has been highly valued by the metallurgical industry for its advantages of high efficiency, energy saving, high quality, easy automation and intelligence, etc., and the matching continuous casting mold powder has also been developed accordingly, and has become an indispensable Metallurgical auxiliary materials; for high-titanium alloy welding wire steel, the control range of Ti is generally required to be 0.10-0.25%, the droplet is refined during welding, the arc is stable, the spatter is reduced, and the welding performance is good; however, this high-titanium alloy welding wire Steel has special requirements for mold slag during continuous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 李桂荣王宏明
Owner JIANGSU UNIV