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Plasma submerged arc heating device for steel ingot risers of 5-600 tons

A technology of submerged arc heating and plasma, which is applied in the field of steel ingot preparation, can solve the problems of small riser heat capacity, unsmooth feeding channel, and large impact of metal liquid surface, etc., and achieves reduced cutting volume, improved utilization rate, and convenient transportation. cheap effect

Active Publication Date: 2014-03-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the preparation process of steel ingots, there are often serious shrinkage porosity problems. The main reason is that the heat capacity of the riser is small, the feeding channel is not smooth, and the molten metal at the riser cannot successfully complete the feeding task.
Some effects can be achieved by increasing the volume of the riser, increasing the thermal insulation covering agent and using supplementary delivery, but these methods all waste materials and greatly increase the manufacturing cost of steel ingots, which is not conducive to energy saving and consumption reduction.
Using traditional plasma heating equipment for heating, there are unfavorable factors such as slow arc starting, high energy consumption, high noise, large impact on the metal liquid surface, and impact on the accuracy of surrounding measuring instruments.

Method used

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  • Plasma submerged arc heating device for steel ingot risers of 5-600 tons
  • Plasma submerged arc heating device for steel ingot risers of 5-600 tons
  • Plasma submerged arc heating device for steel ingot risers of 5-600 tons

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Such as figure 2 As shown, the plasma submerged arc heating device with the riser of the large steel ingot was used for trial production of 5.6 tons of large steel ingots, the material was 42CrMo, the filling time was 19min, and the pouring temperature was 1530°C. Prepare steel ingot molds, risers and gating systems according to the process regulations, and simultaneously smelt molten steel, and the temperature of molten steel is controlled at a low superheat. Before pouring, clean the ingot cavity and prepare the insulation covering agent. use The small sprue flow steel brick is poured, and the molten steel flow rate is controlled at the same time. The pouring method is slow pouring at the beginning, fast pouring in the middle section, forging of the riser and slow pouring. After the molten steel is poured, the riser is heated immediately, and after heating for 10 minutes, the heating is stopped, and the thermal insulation covering agent is added. Finally, take of...

Embodiment 2

[0056] Such as figure 2 As shown, the plasma submerged arc heating device with the riser of the large steel ingot is used for trial production of 5.5 tons of large steel ingots, the material is 42CrMo, the filling time is 18min, and the pouring temperature is 1550°C. Prepare steel ingot molds, risers and gating systems according to the process regulations, and simultaneously smelt molten steel, and the temperature of molten steel is controlled at a low superheat. Before pouring, clean the ingot cavity and prepare the insulation covering agent. use The small sprue flow steel brick is poured, and the molten steel flow rate is controlled at the same time. The pouring method is slow pouring at the beginning, fast pouring in the middle section, forging of the riser and slow pouring. After the molten steel is poured, the riser is heated immediately, and after 20 minutes of heating, the heating is stopped and the thermal insulation covering agent is added. Finally, take off the i...

Embodiment 3

[0058] Such as figure 2 As shown, the plasma submerged arc heating device with the riser of the large steel ingot was used for trial production of 5.8 tons of large steel ingots, the material was 42CrMo, the filling time was 20min, and the pouring temperature was 1580°C. Prepare steel ingot molds, risers and gating systems according to the process regulations, and simultaneously smelt molten steel, and the temperature of molten steel is controlled at a low superheat. Before pouring, clean the ingot cavity and prepare the insulation covering agent. use The small sprue flow steel brick is poured, and the molten steel flow rate is controlled at the same time. The pouring method is slow pouring at the beginning, fast pouring in the middle section, forging of the riser and slow pouring. After the pouring of molten steel is completed, the riser is heated immediately, and after heating for 30 minutes, the heating is stopped and the thermal insulation covering agent is added. Fin...

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Abstract

The invention relates to plasma heating equipment for steel ingot risers, in particular to a plasma submerged arc heating device for steel ingot risers of 5-600 tons. Special plasma equipment is used for heating and preserving heat of steel ingot risers of 5-600 tons, is suitable for heating and preserving heat of steel ingots of different sizes and risers made of other materials, and can be used for smelting nonferrous metal alloys. The plasma submerged arc heating device comprises assemblies such as a direct-current power supply cabinet, a control box, a plasma submerged arc heating gun and the like, wherein the plasma submerged arc heating gun has a three-layer structure; a gas channel is formed between an outer layer and a middle layer; a water cooling channel is formed between the middle layer and an inner layer; the front end of the middle layer is provided with a cathode electrode; the outer layer has a segmental combined structure; a steel structure is arranged behind the outer layer; and the front end of the outer layer has a refractory material structure. The plasma submerged arc heating device belongs to submerged arc heating, contributes to overcoming the defects of the conventional plasma heating equipment, has the characteristics of low energy consumption, low noise, quick arc starting, small influences on peripheral measuring instruments and the like, and is suitable for riser heating of steel ingots.

Description

technical field [0001] The invention relates to the field of steel ingot preparation, specifically a plasma submerged arc heating device for steel ingot risers of 5 tons to 600 tons. It is a plasma heating device for steel ingot risers. The steel ingot riser is used for heating and heat preservation. It is suitable for heating and heat preservation of steel ingots of different sizes and risers of other materials, and can also be used for smelting non-ferrous metal alloys. Background technique [0002] During the preparation of steel ingots, there are often serious shrinkage porosity problems. The main reason is that the heat capacity of the riser is small, the feeding channel is not smooth, and the molten metal at the riser cannot successfully complete the feeding task. Some effects can be achieved by enlarging the volume of the riser, increasing the thermal insulation covering agent and using supplementary delivery, but these processes all waste materials and greatly increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/10
Inventor 夏立军李殿中王雪东康秀红傅排先刘宏伟李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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