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Protective tube for molten steel tapping process

A technology for steel tapping process and protection pipe, which is applied in the field of iron and steel metallurgy and steelmaking, which can solve the problems such as difficult to realize the protection of molten steel, achieve good heat preservation effect, reduce the temperature of steel tapping, and avoid the effect of direct erosion

Pending Publication Date: 2018-06-05
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can prevent the molten steel from increasing nitrogen to a certain extent, it is difficult to protect the molten steel during the tapping process.

Method used

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  • Protective tube for molten steel tapping process
  • Protective tube for molten steel tapping process
  • Protective tube for molten steel tapping process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] combine figure 1 As shown, a protective tube used in the process of molten steel tapping of the present invention includes a protective sleeve 100 and a connecting member 200. The inner diameter of the protective sleeve 100 is larger than the diameter of the tapping port, so that the steel flow flows through There is a gap between the protective sleeve 100 and the inner wall of the protective sleeve 100; the connecting member 200 is used to connect with the steel tapping port, and the connecting member 200 is provided with an accommodating cavity 210, and the accommodating cavity 210 is used to be sleeved on the steel tapping port the exterior. Moreover, the accommodating cavity 210 is a cylindrical cavity, and the inner diameter of the cylindrical cavity is larger than the inner diameter of the inlet end 110 of the sleeve.

[0046] The casing inlet end 110 of the protective casing 100 in this embodiment is connected with the connecting member 200 to form a through pro...

Embodiment 2

[0051] The basic content of this embodiment is the same as that of Embodiment 1, the difference is that the outer casing 104, the heat insulation layer 102 and the refractory material layer 101 (eg figure 2 shown); the shell 104 is made of a steel structure with high mechanical strength, and the heat insulating layer 102 is made of heat insulating material, wherein the heat insulating material is glass fiber, asbestos, rock wool or silicic acid salt, or a combination of the above; the thermal insulation material of the thermal insulation layer 102 can effectively limit the heat of the molten steel in the protective sleeve 100 to dissipate heat to the outside of the protective sleeve 100, thereby reducing the temperature loss during the tapping process, thereby reducing the tapping. temperature, saving energy consumption in steelmaking. The refractory material layer 101 is disposed on the inner wall of the protective sleeve 100, and the refractory material layer 101 is made of...

Embodiment 3

[0053] The basic content of this embodiment is the same as that of Embodiment 2, except that a gap layer 103 (such as figure 2 shown), that is, a gap is set between the outer shell 104 and the heat insulating layer 102, and a gap layer 103 is formed. Layer 103 is filled with air. The void layer 103 between the casing 104 and the heat insulating layer 102 changes the heat transfer conditions of the protective sleeve 100, thereby limiting the heat transfer of molten steel in the protective sleeve 100 to the outside, and reducing the heat loss during the tapping process of the molten steel.

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Abstract

The invention discloses a protective tube for the molten steel tapping process and belongs to the technical field of steel metallurgy steelmaking. The protective tube comprises a protective sleeve anda connecting component, wherein the internal diameter of the protective sleeve is greater than the diameter of a steel tapping opening, so that a gap is reserved between steel flow and the inner wallof the protective sleeve when the steel flow flows through the protective sleeve; the connecting component is used for being connected with the steel tapping opening; the sleeve inlet end of the protective sleeve is connected with the connecting component and forms a penetrating protective tube; and the steel flow flows to the protective sleeve from the steel tapping opening via the connecting component. The protective tube establishes a closed steel flow passage to effectively isolate contact between molten steel and the air and protect the steel tapping process of molten steel, so that theadsorbing capacity of molten steel to harmful gas including nitrogen and hydrogen is greatly reduced, an excellent thermal insulation effect to molten steel is realized, heat loss of molten steel is effectively reduced, and temperature reduction of molten steel during the steel tapping process is reduced to further improve the quality of molten steel.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy and steelmaking, and more particularly, to a protection pipe used in the process of molten steel tapping. Background technique [0002] The principle of steelmaking is to remove excess carbon and other impurities contained in pig iron into gas or slag with oxygen or iron oxides under high temperature conditions. After the molten steel is smelted and tapped, the out-of-furnace refining and continuous casting process control the oxygen, nitrogen, hydrogen and temperature in the steel very strictly. However, there is almost nothing to protect the molten steel during the tapping process. During the tapping process, the molten steel is in direct contact with the air, resulting in a large amount of harmful gases such as nitrogen and hydrogen entering the molten steel, which deteriorates the performance of the steel, and provides a good solution for the subsequent refining and continuou...

Claims

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Application Information

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IPC IPC(8): B22D35/04C21C7/00
CPCC21C7/00B22D35/04
Inventor 张立强吴朝阳凌海涛彭世恒王海川袁保辉张月云胡佳佳唐浩朱鸿远冉波黄世芳夏世民
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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