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A kind of mold slag for continuous casting mold for high temperature alloy steel and its manufacturing method
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A technology for continuous casting mold and high temperature alloy steel, which is applied in the field of steelmaking and continuous casting, can solve the problems of difficult control of heat transfer, difficulty in crystallization of mold slag, etc., so as to reduce the generation of rare earth oxides, improve heat preservation and flow Performance, uniform heat transfer effect
Active Publication Date: 2016-07-20
JIANGSU BINXIN STEEL GRP
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If the alkalinity is too low, it will be difficult to crystallize the mold slag, and it is not easy to control the heat transfer
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[0018] A mold slag for continuous casting molds for high-temperature alloy steel, which is obtained by crushing, mixing, pulping, and granulating the following raw materials: premelt, modified fly ash, attapulgite, industrial soda ash, lithium carbonate, coke , Calcium carbonate powder, the composition of the mold powder contains by weight percentage: SiO 2 32.3~37.8%, CaO31.0~40.0%, Al 2 o 3 3.0~6.0%, Li 2 O3.5~3.5%, Na 2 O5.5~9.5%, F5.5~8.5%, TC4.5~6.5%, 0.42 o 3 ≤2.2%, the rest is K 2 O≤2%, MnO≤1% and other trace components; the physical and chemical performance parameters of the mold flux are: the hemispherical point melting temperature is 1094-1150°C, the viscosity at 1250°C is 0.18-0.28Pa·s, the crystallization temperature The temperature is 820~1000℃, and the solidification temperature is 930~1000℃; the modified fly ash in the raw material is prepared by placing the burned fly ash in 20-25% sulfuric acid and 16-24% hydrogen oxidation successively. In the sodium so...
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Abstract
The invention discloses continuous casting crystallizer covering slag for high-temperature alloy steel. The continuous casting crystallizer covering slag is prepared by crushing, mixing, pulping and pelleting premelting materials, modified coal ash, attapulgite, industrial sodium carbonate, lithium carbonate, coke and calcium carbonate powder. The continuous casting crystallizer covering slag consists of, in weight percentage, 32.3-37.8% of SiO2, 31.0-40.0% of CaO, 3.0-6.0% of Al2O3, 3.5-3.5% of Li2O, 5.5-9.5% of Na2O, 5.5-8.5% of F, 4.5-6.5% of TC, Fe2O3 larger than 0.4% and smaller than or equal to 2.2%, and the balance K2O smaller than or equal to 2%, MnO smaller than or equal to 1% and other microcomponents; binary basicity CaO / SiO2 of the covering slag is controlled in a range between 1.07 and 1.15; and physical and chemical property parameters of the covering slag include that hemisphere point melting temperature ranges from 1094 DEG C to 1150 DEG C, the viscosity ranges from 0.18Pa*s to 0.28Pa*s at the temperature lower than 1250 DEG C, crystallization temperature ranges from 820 DEG C to 1000 DEG C, and solidification temperature ranges from 930 DEG C to 1000 DEG C. The coal ash is modified, the dispersibility of the coal ash is improved, the superficial area of the coal ash is increased, heat insulation and flowing properties are further improved, and nano ore powder further has effects of purifying molten steel and absorbing impurities in the molten steel.
Description
technical field [0001] The invention relates to a mold mold slag for continuous casting of molten steel, in particular to a mold mold slag for continuous casting of high-temperature alloy steel and a preparation method thereof, belonging to the technical field of steelmaking and continuous casting. technical background [0002] High-temperature alloy steel (including 09CuPRE, 09CuPCrNi and other steel types) contains crack-sensitive elements such as Cu, Ti, Cr and Ni, and defects such as cracks and slag pits are prone to occur on the surface of the slab during continuous casting. In the continuous casting process, the use of mold powder in the mold is an indispensable means to control the surface quality of the continuous casting slab and ensure the smooth operation of the continuous casting. The main functions of the mold powder are as follows: 1. Lubricate between the mold and the slab; 2. Absorb the inclusions floating up from the molten steel; 3. Prevent the secondary ox...
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