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Low-pollution energy conservation slag system used for manufacturing hollow ingot by remelting electroslag in ingot drawing way

A technology for electroslag remelting and hollow ingot, which is applied in the field of pre-melting slag, can solve the problems of unsuitable ingot extraction electroslag remelting, easy occurrence of slag leakage or steel leakage, poor high temperature toughness, etc., and achieves good removal of inclusions. capacity, reduction of slag leakage and steel leakage, the effect of high temperature plasticity

Active Publication Date: 2013-10-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Traditional electroslag remelting slag system, such as 70%CaF 2 +30%Al 2 o 3 (ANF-6), 60%CaF 2 +20%CaO+20%Al 2 o 3 and 40% CaF 2 +30%CaO+30%Al 2 o 3 etc., because the above-mentioned slag crystallizes during the cooling and cooling process, its high-temperature toughness is very poor due to crystallization; in addition, its viscosity will suddenly increase with the decrease of temperature near the melting temperature, so it is called "short slag", and When ingot-pulling electroslag remelting is used to produce hollow steel ingots, due to the increase in the frictional surface area, the friction force of the ingots is greatly increased, and the slag skin cannot play a sufficient lubricating role in the ingot-pulling process. When the ingot-pulling speed is too fast, it is easy to The phenomenon of slag leakage or steel leakage occurs, and the traditional slag system is not suitable for the process conditions of ingot-pulling electroslag remelting

Method used

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  • Low-pollution energy conservation slag system used for manufacturing hollow ingot by remelting electroslag in ingot drawing way
  • Low-pollution energy conservation slag system used for manufacturing hollow ingot by remelting electroslag in ingot drawing way
  • Low-pollution energy conservation slag system used for manufacturing hollow ingot by remelting electroslag in ingot drawing way

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Fluorite, lime, industrial alumina, fused magnesia, silica and sodium carbonate are used as raw materials. The prepared raw materials are mixed and melted in a three-phase electric arc furnace. The materials are all melted and stirred evenly. Refined for 30 minutes; then poured into a cast iron plate with a bottom thickness of 100mm, cooled and solidified to room temperature for 4 hours, crushed with a crusher and sieved out the part with a particle size of 1~10mm, and obtained the electroslag for ingot pumping The low-pollution and energy-saving pre-melted slag of the hollow ingot is remelted, packed into a 20kg bag, and used in a power slag furnace; the composition of the above-mentioned pre-melted slag is Al by weight percentage 2 o 3 15%, CaO37%, SiO 2 14%, MgO1%, Na 2 O3%, the balance is CaF 2 And unavoidable impurities; binary alkalinity CaO / SiO 2 is 2.64, the melting temperature is 1250~1270°C, and the resistivity at 1600°C is 0.512Ω·cm; its temperature-visco...

Embodiment 2

[0032] Fluorite, lime, industrial alumina, fused magnesia and silica are used as raw materials. The prepared raw materials are mixed and melted in a three-phase electric arc furnace. After all the materials are melted, they are stirred evenly and refined at 1550~1580°C for 30 minutes. then poured into a cast iron plate with a thickness of 100mm at the bottom, cooled and solidified to room temperature for 4.5 hours, crushed by a crusher and sieved out the part with a particle size of 1-10mm, and obtained the ingot-type electroslag remelting Get the low-pollution and energy-saving pre-melted slag of the hollow ingot, pack it into a bag of 20kg, and use it in a power slag furnace; the composition of the above-mentioned pre-melted slag is Al by weight percentage 2 o 3 20%, CaO35%, SiO 2 10%, MgO3%, the balance is CaF 2 And unavoidable impurities; binary alkalinity CaO / SiO 2 is 3.5, the melting temperature is 1270~1280°C, and the resistivity at 1600°C is 0.569Ω·cm; its temperatu...

Embodiment 3

[0036] Fluorite, lime, industrial alumina, fused magnesia and silica are used as raw materials to prepare low-pollution and energy-saving pre-melted slag for hollow ingots produced by electroslag remelting. The method is the same as in Example 2, and its composition is as follows % by weight is Al 2 o 3 19%, CaO36%, SiO 2 12%, MgO3%, the balance is CaF 2 And unavoidable impurities; binary alkalinity CaO / SiO 2 is 3, the melting temperature is 1260~1280°C, and the resistivity at 1600°C is 0.603Ω·cm;

[0037] Adopt above-mentioned premelting slag electroslag remelting high-pressure boiler steel P91, method is the same as embodiment 1, difference is:

[0038] During electroslag remelting, the amount of pre-melted slag is 300~350kg / furnace steel, the voltage is 72~76V, the current is 20~22kA, and the melting rate is 1000~1100kg / h. The casting speed is 5~6 mm / min; the size of the produced hollow ingot is Φ900 / Φ500mm, the inner and outer surfaces of the hollow ingot are of good ...

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Abstract

The invention provides a low-pollution energy conservation slag system used for manufacturing a hollow ingot by remelting electroslag in an ingot drawing way. The low-pollution energy conservation slag system comprises the following components in percentage by weight: 15 to 25% of Al2O3, 30 to 40% of CaO3, 8 to 14% of SiO2, 1 to 3% of MgO, 0 to 3% of Na2O, and the balance of CaF2 and inevitable impurities; and the binary basicity of CaO / SiO is 2.5 to 5.0. According to the slag system, components of the slag system are optimized, therefore, relevant performances of the slag system can be further improved, the requirement of a process for producing the hollow ingot by remelting the electroslag is met, and the stability of chemical components of a steel element in the remelting process, high capability of removing inclusion, low environmental pollution and low electricity consumption can be ensured, and as a result, the energy conservation and emission reduction effects are realized.

Description

technical field [0001] The invention relates to a pre-melted slag for producing a hollow ingot, in particular to a low-pollution and energy-saving slag system used for producing a hollow ingot by ingot-pulling electroslag remelting. Background technique [0002] With the rapid development of nuclear power, thermal power, hydropower, petrochemical and other industries, the requirements for the size and quality of large cylindrical forgings are getting larger and higher; for thick-walled pipes, especially for medium and large diameter seamless thick The demand for wall pipes and extra-thick wall pipes is also increasing. Traditionally, these hollow forgings are usually obtained by punching and reaming ordinary steel ingots. However, this method has complicated procedures and a low yield of forging materials, resulting in a large amount of material waste. The large-scale ingot pumping electroslag remelting furnace can directly remelt hollow steel ingots with different diameter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C21C7/076B22D7/04
CPCY02P10/20
Inventor 姜周华陈旭刘福斌臧喜民
Owner NORTHEASTERN UNIV
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