A kind of high manganese high aluminum steel mold powder containing ferric oxide and its application
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A technology of ferric oxide and mold slag, applied in the field of iron and steel smelting and continuous casting, can solve the problems of deterioration of lubrication and control of heat transfer, achieve good physical and chemical properties, ensure fluidity, and inhibit the effect of slag-steel reaction
Active Publication Date: 2019-11-01
CENT SOUTH UNIV
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The mold flux can effectively inhibit the slag-steel reaction and reduce the probability of slag entrainment, but the mold flux is added flux (Na 2 O. Li 2 O, F - ) content is too small, which will lead to high melting point of mold slag, thin slag layer of mold slag on molten steel surface, liquid slag cannot smoothly flow into the gap between billet and mold wall, thus deteriorating lubrication and important functions such as controlling heat transfer
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Embodiment 1
[0036] Ingredients: CaO 27.92%, Al 2 O 3 24.78%, SiO 2 11.6%, Na 2 O 9.2%, Li 2 O 3.6%, MnO 3.2%, BaO 6.8%, F ‐ 9.6% Fe 2 O 3 3.3%, (CaO+BaO) / Al 2 O 3 is 1.405, Fe 2 O 3 / SiO 2 is 0.284.
[0037] Preparation process: Weigh the above-mentioned mold slag raw materials according to the target components, perform mechanical stirring to make the components evenly mixed, and then use an intermediate frequency induction furnace to heat and melt the mixed samples to remove volatiles and gaseous substances, and complex complexes are formed between the components. Solid solution, pour the molten slag into water to quench to obtain a glassy mold slag block, and mechanically crush and grind the mold slag block to obtain the desired mold slag powder.
[0038] The main physical properties of the mold powder are shown in Table 1.
Embodiment 2
[0040] Ingredients: CaO 27.13%, Al 2 O 3 24.06%, SiO 2 11.81%, Na 2 O 9.1%, Li 2 O 3.9%, MnO 3.3%, BaO 6.7%, F ‐ 9.3% Fe 2 O 3 4.7%, (CaO+BaO) / Al 2 O 3 is 1.406, Fe 2 O 3 / SiO 2 is 0.398.
[0041] Preparation process: same as Example 1.
[0042] The main physical properties of the mold powder are shown in Table 1.
Embodiment 3
[0044] Ingredients: CaO 26.58%, Al 2 O 3 23.7%, SiO 2 11.22%, Na 2 O 9.2%, Li 2 O 3.7%, MnO 3.9%, BaO 6.6%, F ‐ 9.2% Fe 2 O 3 5.9%, (CaO+BaO) / Al 2 O 3 is 1.400, Fe 2 O 3 / SiO 2 is 0.526.
[0045] Preparation process: same as Example 1.
[0046] The main physical properties of the mold powder are shown in Table 1.
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Abstract
The invention discloses high manganese and high aluminous steel continuous casting covering slag containing ferric oxide and application thereof. The covering slag comprises, by mass, 22%-32% of CaO, 19%-29% of Al2O3, 10%-16% of SiO2, 2%-8% of MnO, 6%-12% of Na2O, 2%-6% of Li2O, 4%-12% of BaO, 7%-13% of F, 2%-10% of Fe2O3, 1.3%-2.3% of (CaO+BaO) / Al2O3 and 0.2%-0.9% of Fe2O3 / SiO2. By adding a proper amount of the Fe2O3 in a controlled mode, the covering slag with the low viscosity and good crystallization property is obtained. The covering slag is applied to the high manganese and high aluminous steel slab continuous casting production process, the slag-steel reaction happening in the continuous casting process can be effectively restrained, the crystallization property and lubricating property of the covering slag in the continuous casting process are changed to be more stable, the effect that the high manganese and high aluminous steel continuous casting process can be executed smoothly is guaranteed, and the surface quality of a poured high manganese and high aluminous steel casting blank is excellent.
Description
technical field [0001] The invention belongs to the field of iron and steel smelting and continuous casting, and relates to a mold powder for continuous casting of high-manganese and high-alumina steel with good physical and chemical properties and small slag-steel reaction degree. Background technique [0002] With the development of the automobile industry and energy industry, Al is added to steel as an alloying element, and steels with high aluminum content have become a research hotspot, such as TRIP steel and TWIP steel, which are a new generation of advanced high-strength steels and are widely used in the automotive industry; Due to the active chemical properties of Al at high temperature, the Al in the high-alumina molten steel will interact with the SiO in the mold slag. 2 wait for the reducing substances to undergo a redox reaction, SiO 2 The large consumption of slag will cause the alkalinity of the mold residue (CaO / SiO 2 ) increased sharply, while the Al in the...
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