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A technology of mold slag and form, applied in the field of new mold slag, can solve problems such as poor lubrication performance of mold slag, slag-steel reaction, and increased driving force of slag-steel reaction
Inactive Publication Date: 2015-03-25
CENT SOUTH UNIV
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Problems solved by technology
Although the C / A=0.8-1.2 series mold flux can significantly reduce the slag-steel reaction, but there are problems of abnormal melting of the mold flux and poor lubrication performance. The main reason is that in the theoretical low melting point region, the crystal phase produced is a small primary crystal plane and extremely unstable C 12 A 7 , while CA 2 , CA, C 3 A will precipitate during the crystallization process of the mold flux, which will strengthen the crystallization performance, thus resulting in poor lubrication performance of the mold flux
The C / A=3.0-4.0 series of mold flux can improve the lubrication performance of the mold flux, reduce surface depressions and longitudinal cracks, but relatively low Al 2 o 3 The content will increase the driving force of the slag-steel reaction and make the slag-steel reaction more serious
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Embodiment 1
[0046] A high-aluminum steel continuous casting mold powder, the composition of which is: CaO: 30%, Al 2 o 3 : 21%, SiO 2 : 15.3%, MgO: 2.3%, Na 2 O: 11%, Li 2 O: 6%, F - : 5%, BaO: 4%, MnO: 2.4%, C: 3%, the CaO+BaO and Al of the mold flux 2 o 3 The mass ratio (C / A) is 1.6, the viscosity at 1300°C is 0.14Pa·s, the melting point is 1044°C, and the crystallization rate is 59.1%. The mold flux designed in this embodiment is used for continuous casting of high-alumina steel with a mass percentage of Mn of 23% and a mass percentage of Al of 2.5%. .
Embodiment 2
[0048] A high-aluminum steel continuous casting mold powder, the composition of which is composed of: CaO: 31%, Al 2 o 3 : 35%, SiO 2 : 7%, MgO: 2.3%, Na 2 O: 5.7%, Li 2 O: 3%, F - : 7%, BaO: 4%, MnO: 3.0%, C: 2%, the CaO+BaO and Al of the mold flux 2 o 3 The mass ratio (C / A) is 1.1, the viscosity at 1300°C is 0.34Pa·s, the melting point is 1106°C, and the crystallization rate is 67.8%. The mold flux designed in this embodiment is used for continuous casting of high-alumina steel with a mass percentage of Mn of 25% and a mass percentage of Al of 2.5%. .
Embodiment 3
[0050] A high-aluminum steel continuous casting mold powder, the composition of which is composed of: CaO: 25%, Al 2 o 3 : 24%, SiO 2 : 12%, MgO: 4.2%, Na 2 O: 8.8%, Li 2 O: 6%, F - : 7.6%, BaO: 6%, MnO: 2.4%, C: 4%, the CaO+BaO and Al of the mold flux 2 o 3 The mass ratio (C / A) is 1.3, the viscosity at 1300°C is 0.18Pa·s, the melting point is 1089°C, and the crystallization rate is 24.6%. The mold flux designed in this embodiment is used for continuous casting of high-alumina steel with a mass percentage of Mn of 21.5% and a mass percentage of Al of 1.5%, and the probability of longitudinal cracks and inclusions in the obtained slab is lower than 0.42%. .
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Abstract
The invention belongs to the technical field of casting powder for continuous casting of iron and steel and relates to novel casting powder and application thereof. The casting powder is made of, by weight, 25-45% of CaO, 15-35% of Al2O3, 27-18% of SiO, 2-5% of MgO, 4-11% of Na2O4, 2-7% of Li2O, 5-12% of F, 3-15% of BaO, 1-3% of MnO and 1-7% of C. The novel casting powder has the advantages of low melting point, low viscosity, moderate crystallizing rate and the like and is especially applicable to continuous casting of high-aluminum steel with C mass percentages being 0.14-0.20%, Al mass percentages being 1.5-2.5% and Mn mass percentages being 21.5-25.0%. The novel casting powder applicable to continuous casting production of high-aluminum steel plates can effectively reduce metal slag reactivity so as to slow down performance deterioration of the casting powder due to metal slag reaction, metal slag interface tension is improved to prevent slag entrapment, excellent lubrication and heat transfer performances of the casting powder are guaranteed, slow cooling of crescent faces is realized, and high-aluminum steel slabs excellent in surface quality can be made by casting.
Description
technical field [0001] The invention relates to a novel mold flux and its application, and belongs to the technical field of iron and steel continuous casting mold flux. Background technique [0002] With the development of the automobile industry and the energy industry, steel types with high aluminum content have become research hotspots. Typical high-aluminum steel types include: Al-TRIP steel, non-magnetic steel, electrical steel, E2 steel, etc., which are used in steel production. an important species. Due to its special properties, steel with high aluminum content has a wide range of uses in various industrial fields. For example, 38CrMoAl has an aluminum content as high as 0.7-1.2%, and it has been widely used in aviation industry, conventional weapons and machinery manufacturing; E2 series high aluminum steel The Al content in the steel is as high as 1.5-2.0%, and interacts with other elements. The steel has good corrosion resistance and is widely used in the chemic...
Claims
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Application Information
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