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Gas protection process for feeding alloy wire into molten steel and its equipment

A gas protection device and gas protection technology are applied in the alloying of molten steel in iron and steel plants, the refining process and its devices, which can solve the problems of increased inclusions, low alloy recovery rate, and oxidation of molten steel.

Inactive Publication Date: 2005-06-15
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used wire feeding machine is to use the pinch roller to drive the alloy wire, and feed the alloy wire into the ladle through the wire tube. Since there is no anti-oxidation means, the alloy wire will be oxidized on the surface of the molten steel or even above the molten steel surface, causing the alloy The recovery rate is low, the liquid steel surface fluctuates and exposes, resulting in the oxidation of molten steel and the increase of inclusions
Some steel mills use the ladle to cover and seal for protection, but due to the large investment, complicated operation, and often poor sealing effect, it has not been widely used

Method used

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  • Gas protection process for feeding alloy wire into molten steel and its equipment
  • Gas protection process for feeding alloy wire into molten steel and its equipment

Examples

Experimental program
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Embodiment Construction

[0007] The alloy wire (7) enters the molten steel (1) through the conduit (3), (4) along the direction of the arrow, and the protective gas is filled into the conduit (3), (4) from the gas supply pipe (5) and the through hole (6). , and rush out from the wire conduits (3), (4) to form a protected area (2) to protect a section of the alloy wire (7) and molten steel (1). The conduit (4) is lifted or lowered by the lifting arm (8). The included angle α is an acute angle, so as to reduce the shielding gas rushing out from the wire inlet end of the conduit (3). According to the user's intention, the wire conduit (4) can be made into a bell mouth shape.

[0008] The process and device proposed by the invention can reduce the degree of oxidation of alloy wires, especially easily oxidized alloy wires such as calcium, magnesium, titanium, aluminum and their composites, and improve the metallurgical effect.

[0009] In the production of steel types such as 45, 08Al, Q345D, 16MnR, AH36...

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Abstract

The gas protection process and its device for the alloying and refining of the molten steel feeding line in the iron and steel plant adopt the method of blowing protective gas into the wire conduit of the ladle wire feeding machine to form a specific gas protection area around the alloy wire and the liquid surface of the ladle. It can prevent the alloy and molten steel from being oxidized by the air, improve the recovery rate of the alloy, prevent the liquid surface from churning, purify the molten steel, and improve product quality.

Description

technical field [0001] The invention relates to an alloying and refining process of molten steel in a steel plant and a device thereof, in particular to a gas shielding process for alloying and refining molten steel using a wire feeder and a device thereof. Background technique [0002] Wire feeders are commonly used in iron and steel plants to alloy and refine molten steel for the purpose of adjusting the composition of molten steel, deoxidizing, and purifying molten steel. At present, the commonly used wire feeding machine uses pinch rollers to drive the alloy wire, and feeds the alloy wire into the ladle through the wire tube. Since there is no anti-oxidation means, the alloy wire will be oxidized on the surface of the molten steel or even on the surface of the molten steel, causing the alloy The low recovery rate and the fluctuation and exposure of the liquid steel surface cause the oxidation of the molten steel and the increase of inclusions. Some steel mills use the l...

Claims

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Application Information

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IPC IPC(8): C21C7/04C22C33/04
Inventor 苗钊周兰聚
Owner SHANDONG IRON & STEEL CO LTD
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