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Tundish covering agent for pure steel, and its making method

A manufacturing method and covering agent technology, applied in the direction of improving process efficiency, etc., can solve problems such as high melting point, unfavorable production of pure steel, and difficulty in forming a slag layer

Inactive Publication Date: 2003-12-17
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as Germany B.Bergmann, British H.Wdtkinson et al.'s research has shown this point; although patent US6174347B1, US6179895B1 is also a kind of high alkalinity tundish covering agent, it is not pre-melted hollow particles, but utilizes The slag refined in the ladle metallurgical furnace (Ladle Metallgy Furnace) is processed into a covering agent; in addition, under the condition of using the same mineral raw materials, the refined slag contains more impurities such as sulfur and iron oxide than the directly used mineral raw materials The slag obtained by pre-melting treatment is high, which is not conducive to the production of high-quality steel types, such as high-grade ultra-low sulfur steel, etc.
Although the patent CN1280892A is also a covering agent for hollow particles, it is not pre-melted or high-basic, but magnesia; this type of covering agent has a high melting point, and it is difficult to form an effective coating on the surface of molten steel. Slag layer, the effect of isolating air is poor, which is not conducive to the production of pure steel

Method used

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Embodiment Construction

[0034] (1) The present invention is a pre-melted high-basic (micro) carbon-free granular tundish covering agent. It is composed of premelted slag (clinker) and part of unpremelted material (raw meal), and its basicity R≥5.0. Clinker is the main component of the covering agent of the present invention, and raw meal is mainly used for component adjustment. Calculated by weight percentage, clinker accounts for 69-98.8%, raw material accounts for 0.1-30%; binder accounts for 1.0-5.0%, and its alkalinity R≥5.0.

[0035] Slaked lime 32.0~66.0%

[0036] The mixed raw materials are mainly: calcium carbonate, bauxite, magnesia and quartz sand, all or one or a combination of several of them. The dosages of different types of raw materials are (according to the total weight percentage of the tundish covering agent): 0.1-15% of calcium carbonate, 0-14% of bauxite, 0-12% of magnesia, and 0-4% of quartz sand; The total amount of raw meal is 0.1-30%.

[0037]The pre-melted basic...

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Abstract

A granular or spherical hollow covering agent of tundish for high-purity steel is prepared from the prefused grog chosen from hydrated lime, calcium carbonate, quartz sand, etc. the raw material including calcium carbonate, bauxite and quartz sand, and the adhesive through prefusing the powdered grog, mixing with raw material, grinding, stirring, adding additive and shaping. Its preparing process is also disclosed. Its advantages are no reaction on molten steel, and high quality of steel.

Description

technical field [0001] The invention relates to an auxiliary material for steelmaking continuous casting and a manufacturing method thereof, in particular to a pre-melted high-alkalinity carbon-free tundish covering agent for pure steel and a manufacturing method thereof. Background technique [0002] The tundish covering agent is a synthetic auxiliary material added to the tundish to cover the surface of molten steel during the continuous casting of molten steel. It has the following functions: [0003] (1) Heat insulation and heat preservation to reduce heat loss on the liquid steel surface; [0004] (2) Isolate the air to prevent secondary oxidation of molten steel; [0005] (3) Dissolving non-metallic inclusions floating to the surface of molten steel to purify molten steel. [0006] As people's requirements for the quality of molten steel are getting higher and higher, the tundish is the last refractory container before molten steel enters the mold, and its influence...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCY02P10/20
Inventor 陈荣欢王妍朱祖民朱立新
Owner BAOSHAN IRON & STEEL CO LTD
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