Protective slag for ultralow carbon steel continuous casting

A technology for continuous casting of mold slag and ultra-low carbon steel, which is applied in the field of mold slag and can solve the problems of hindering mold slag and increasing the viscosity of mold slag.

Inactive Publication Date: 2007-02-14
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the interaction characteristics of these carbides with the mold slag base material, such as the strong wettability of SiC solid particles and slag, it is easy to increase the viscosity of the mold slag, which hinders the normal development of other metallurgical properties of the mold slag

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  • Protective slag for ultralow carbon steel continuous casting
  • Protective slag for ultralow carbon steel continuous casting
  • Protective slag for ultralow carbon steel continuous casting

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Embodiment Construction

[0017] An ultra-low carbon steel continuous casting mold flux. The components (% by weight) of the mold flux are: 0.5-1.6 carbonaceous material, 2-8 metal melting rate regulator, 2-7 MgO, 6-12 Na 2 O, F from 2 to 8 - , Al of 2 to 7 2 o 3 , 3~8 MnO, 1~3 Fe 2 o 3 , and the rest are CaO and SiO 2 ; Among them, CaO / SiO 2 0.75 to 1.05.

[0018] In the mold flux of the present invention, CaO and SiO 2 As the base material, the basicity of mold flux is controlled by their ratio.

[0019] When casting ultra-low carbon electrical steel with high [Si] content, due to the weak heat transfer capacity of the slab shell, in order to avoid steel breakout accidents, the alkalinity of mold slag CaO / SiO 2 Taking 0.75~0.85 can ensure that the slag film is a glass body and has good lubricating properties for the casting slab;

[0020] When casting [Ti] or [Nb]-free stamping steel, the basicity CaO / SiO 2 0.85-1.05, which is beneficial for the mold slag to absorb the Al at the mold steel...

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Abstract

The ultra-low carbon steel protecting slag for continuous casting consists of carbon material 0.5-1.6 wt%, metal smelting speed regulator 2-8 wt%, MgO 2-7 wt%, Na2O 6-12 wt%, F- 2-8 wt%, Al2O3 2-7 wt%, MnO 3-8 wt%, Fe2O3 1-3 wt%, except CaO and SiO2, where the weight ratio CaO/SiO2 is 0.75-1.05. The metal smelting speed regulator is one of Ca-Si alloy, Ca-Ba-Si alloy, Mn-Si alloy and Fe-Mn alloy or any composition of them. The ultra low carbon steel protecting slag is used for continuous casting, and has synergistic metallurgical functions and no carburization of the continuous cast billet.

Description

technical field [0001] The invention relates to a mold flux for a steelmaking continuous casting crystallizer, in particular to a mold flux for continuous casting of ultra-low carbon steel whose carbon content is less than or equal to 50ppm. Background technique [0002] The continuous casting mold slag, which is uniformly mixed with the base material, flux and melting speed adjustment material, by chemical or mechanical methods, mainly plays a role in the continuous casting process: to protect the molten steel surface of the mold from air oxidation; to protect the molten steel surface Heat insulation and heat preservation; absorption of floating inclusions in molten steel; acting as a lubricant in the casting process; controlling the heat transfer from the casting slab to the mold. Among them, the base material (mainly containing CaO, SiO 2 、Al 2 o 3 ) and flux (Na 2 O, F - , B 2 o 3 , Li 2 O) Mainly adjust the melting temperature, viscosity, absorption of inclusion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 王谦谢兵迟景灏
Owner CHONGQING UNIV
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