Mold powder for continuous casting of high aluminium-titanium-rare earth steel
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A technology of continuous casting mold slag and rare earth, which is applied in the field of iron and steel smelting to meet production needs and stabilize metallurgical properties
Active Publication Date: 2009-12-30
BAOSHAN IRON & STEEL CO LTD
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[0011] The purpose of the present invention is to improve the performance of the mold flux by providing a continuous casting mold flux for high-aluminum titanium rare earth steel, which can adapt to the continuous casting requirements of steel types such as Al, Ti, and rare earth, and fully guarantee the thickness of the liquid slag layer, Lubrication and consumption, to avoid surface defects such as slag inclusions and cracks in the casting slab, or steel breakout accidents caused by excessive drawing resistance, effectively ensuring the smooth operation of the continuous casting process and the surface quality of the slab, thereby producing high-quality slabs Qualified billet
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Embodiment 1
[0025] Mold flux for continuous casting of molten steel with Al, Ti and rare earth content of 0.01%, calculated basicity value R=0.917-0.333×0.01=0.91, chemical composition of mold flux: CaO: 30%, SiO 2 : 33%, Al 2 o 3 : 7%, MgO: 4%, F: 4%, Na 2 O: 5%, Li 2 O: 4%, MnO: 8%, C: 4%, and the rest are trace impurities brought by the raw materials. After the slag-steel reaction is balanced, the mold flux has a viscosity of 0.2Pa.s at 1300°C and a melting point of 1020°C.
Embodiment 2
[0027] Mold flux for continuous casting of molten steel with Al, Ti and rare earth content of 0.5%, calculated value of basicity R=0.917-0.333×0.5=0.75, chemical composition of mold flux: CaO: 30%, SiO 2 : 40%, Al 2 o 3: 5%, MgO: 2.5%, F: 5%, Na 2 O: 7%, Li 2 O: 1.5%, MnO: 2%, B 2 o 3 : 4%, C: 2%, and the rest are trace impurities brought by the raw materials. After the slag-steel reaction is balanced, the mold slag has a viscosity of 0.3Pa.s at 1300°C and a melting point of 1070°C.
Embodiment 3
[0029] Mold flux for continuous casting of molten steel with Al, Ti and rare earth content of 1.2%, calculated value of basicity R=0.917-0.333×1.2=0.52, chemical composition of mold flux: CaO: 22%, SiO 2 : 44%, F: 7%, Na 2 O: 8%, Li 2 O: 2%, MnO: 5%, B 2 o 3 : 7%, C: 1.2%, and the rest are trace impurities brought by the raw materials. After the slag-steel reaction is balanced, the mold slag has a viscosity of 0.45Pa.s at 1300°C and a melting point of 1110°C.
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Abstract
The invention discloses a mold powder for continuous casting of high aluminium-titanium-rare earth steel, which comprises the following compositions in percentage by weight: 20 to 40 percent of CaO, 30 to 50 percent of SiO2, 3 to 8 percent of F, 5 to 9 percent of Na2O, 0 to 5 percent of Li, 0.5 to 5 percent of C, less than 8 percent of Al2O3, less than 5 percent of MgO and the balance of inevitable impurities; and the alkalinity range of CaO/SiO2 is R+/-0.05, wherein R is alkalinity and is equal to between 0.917 and 0.333M; and M is the sum of mass percent of Al, Ti and rare earth elements in molten steel. The mold powder improves the performance, can meet the requirement of the continuous casting of steel types such as Al, Ti, rare earth and the like, fully guarantees the thickness, lubrication and consumption of a melt cinder layer, avoids causing surface defects of casting blanks such as cinder inclusion, cracks and the like or causing steel leakage due to too big withdrawal resistance, and effectively guarantees smooth continuous casting process and the surface quality of the casting blanks so as to produce high-quality casting blanks.
Description
technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a mold slag for continuous casting. Background technique [0002] Continuous casting mold flux is a powdery or small granular steelmaking auxiliary material used to cover the surface of molten steel in the mold of a continuous casting machine. It has multiple functions such as thermal insulation, preventing oxidation of molten steel, absorbing inclusions, lubricating and controlling heat transfer, etc. It is the last technological element in the steelmaking process to control the quality of the final product - the billet. In order to ensure these five functions of the mold slag, when the mold slag covers the surface of the molten steel, a liquid slag layer of a certain thickness must be formed between the molten steel and the solid mold slag, so as to effectively prevent the entry of air and accommodate more foreign inclusions, and Sufficient liquid slag is provided betwee...
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