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Composite steel ladle free of calcium treatment process

A technology of composite steel and processing technology, which is applied in the direction of manufacturing tools, metal processing equipment, casting melt containers, etc., can solve the problems of unstable calcium wire yield, prolong smelting cycle, increase cost and environmental protection, and achieve the elimination of magnesium The formation of aluminum spinel inclusions, the increase in the number of continuous furnaces, and the effect of good resistance to chemical erosion

Active Publication Date: 2022-07-15
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current calcium treatment process has many problems such as unstable calcium line yield, prolonged smelting cycle, increased cost and environmental protection.

Method used

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  • Composite steel ladle free of calcium treatment process
  • Composite steel ladle free of calcium treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: 260t ladle:

[0022] (1) The total thickness of the cladding working layer is 170mm, and the thickness of the cladding-wall magnesia-free brick 7 is 100mm, and its composition is Al 2 O 3 98.4%, the balance of impurities; its performance index is the apparent porosity of 7%, and the compressive strength at room temperature is 125MPa;

[0023] (2) The working layer 8 of the bottom of the package is built with magnesia-free bricks at the bottom of the package, and its composition is Al 2 O 3 94.3%, C3.6%, the balance of impurities, its performance indicators are the apparent porosity of 8%, and the compressive strength of 85MPa;

[0024] (3) When the cladding wall-free magnesia bricks 7 in the cladding working layer and the cladding-bottom magnesia-free bricks in the cladding working layer 8 are built, refractory mud is used for masonry, and its chemical composition mass percentage is: Al 2 O 3 92.1%, SiO 2 3.2%, C3.5%; the remaining impurities, the perf...

Embodiment 2

[0028] Example 2: 100t ladle:

[0029] (1) The total thickness of the cladding working layer is 190mm, and the thickness of the cladding wall without magnesia brick 7 is 90mm, and its composition is Al 2 O 3 90.4%, C8.5%, the remainder impurities; its performance index is 5% apparent porosity, and the normal temperature compressive strength is 85MPa;

[0030] (2) The working layer 8 of the bottom of the package is built with magnesia-free bricks at the bottom of the package, and its composition is Al 2 O 3 90.7%, C 8.3%, the balance of impurities, its performance index is 8% apparent porosity, and compressive strength is 89MPa;

[0031] (3) When the cladding wall-free magnesia bricks 7 in the cladding working layer and the cladding bottom magnesia-free bricks in the cladding working layer 8 are built, the refractory mud is used for masonry, and its chemical composition mass percentage is: Al 2 O 3 90%, SiO 2 4%, C4.5%; the remaining impurities, the performance index is...

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Abstract

The invention relates to a composite steel ladle free of a calcium treatment process, and belongs to the technical field of steelmaking production equipment in the metallurgical industry. According to the technical scheme, a ladle wall working layer is formed by building aluminum-magnesia carbon bricks (6) and ladle wall magnesium-free bricks (7), and the ladle wall magnesium-free bricks comprise the following chemical components in percentage by mass: greater than or equal to 90% of Al2O3, less than or equal to 5% of SiO2 and less than or equal to 5% of C; the performance indexes are as follows: the apparent porosity is less than or equal to 10%, and the compressive strength is more than or equal to 80MPa; the ladle bottom working layer (8) is formed by building ladle bottom magnesium-free bricks, and the ladle bottom magnesium-free bricks comprise the following chemical components in percentage by mass: greater than or equal to 90% of Al2O3, less than or equal to 5% of SiO2 and less than or equal to 5% of C; the performance indexes are as follows: the apparent porosity is less than or equal to 10%, and the compressive strength is more than or equal to 80MPa. The aluminum magnesia carbon brick has the beneficial effects that the mutual reaction between Al in molten steel and MgO in the aluminum magnesia carbon brick can be effectively blocked, the cleanliness of the molten steel is improved, and the castability of the molten steel is ensured.

Description

technical field [0001] The invention relates to a composite ladle with a calcium-free treatment process, belonging to the technical field of steelmaking production equipment in the metallurgical industry. Background technique [0002] The aluminum-magnesium-carbon brick ladle is a commonly used ladle for steel casting. During the molten steel smelting process, Al in the molten steel will form high melting point magnesia-aluminum spinel inclusions with MgO in the ladle brick and slag. Nodules gather at the flow, causing the stopper rod to rise, affecting the casting stability, and causing the casting to be interrupted in severe cases. Therefore, calcium treatment process is often used to solve the problem of pourability of molten steel. However, the current calcium treatment process has many problems such as unstable calcium wire yield, prolonged smelting cycle, increased cost and environmental protection. Therefore, some steel mills have begun to adopt calcium-free treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/00B22D41/02C04B35/10C04B35/66
CPCB22D41/00B22D41/02C04B35/66C04B35/10C04B2235/3418C04B2235/422C04B2235/96Y02P10/20
Inventor 李金波周丹张涛高福彬何璞巩彦坤李巍
Owner HANDAN IRON & STEEL GROUP
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