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

A technology of electroslag remelting and hollow ingot, which is applied in the field of pre-melted slag, can solve the problems of ingot-pulling electroslag remelting, poor high-temperature toughness, easy slag leakage or steel leakage, etc., and achieve good removal of inclusions ability, high temperature plasticity, and the effect of reducing slag leakage and steel breakout

Active Publication Date: 2014-11-26
NORTHEASTERN UNIV LIAONING
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AI Technical Summary

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

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Effect test

Embodiment 1

[0027] Using fluorite, lime, industrial alumina, fused magnesia, silica and sodium carbonate as raw materials, the prepared raw materials are mixed and melted in a three-phase electric arc furnace. Refined for 30 minutes; then cast into a cast iron pan with a bottom thickness of 100mm, and then cooled and solidified to room temperature for 4 hours, crushed by a crusher and screened out the part with a particle size of 1~10mm to obtain the electroslag used for ingot extraction The low-polluting and energy-saving pre-melting slag of hollow ingots is remelted and packaged into a 20kg bag, which is used for power supply to a slag furnace; the composition of the above-mentioned pre-melting slag is Al by weight percentage. 2 O 3 15%, CaO37%, SiO 2 14%, MgO1%, Na 2 O3%, the balance is CaF 2 and inevitable impurities; binary basicity CaO / SiO 2 is 2.64, the melting temperature is 1250~1270℃, and the resistivity at 1600℃ is 0.512Ω·cm; the temperature-viscosity curve is as follows f...

Embodiment 2

[0032] Using fluorite, lime, industrial alumina, fused magnesia and silica as raw materials, the prepared raw materials are mixed and then melted in a three-phase electric arc furnace. ; Then cast into a cast iron pan with a bottom thickness of 100mm, and then cooled and solidified to room temperature for 4.5 hours, crushed by a crusher and screened out the part with a particle size of 1~10mm, and obtained for ingot-drawing electroslag remelting. Take the low-polluting and energy-saving pre-melting slag of the hollow ingot, package it into a 20kg bag, and use it to power the slag furnace; the composition of the above-mentioned pre-melting slag is Al by weight percentage 2 O 3 20%, CaO35%, SiO 2 10%, MgO3%, the balance is CaF 2 and inevitable impurities; binary basicity CaO / SiO 2 is 3.5, the melting temperature is 1270~1280℃, and the resistivity at 1600℃ is 0.569Ω·cm; the temperature-viscosity curve is as follows figure 1 It can be seen from the figure that when the tempera...

Embodiment 3

[0036] Using fluorite, lime, industrial alumina, fused magnesia and silica as raw materials to prepare low-polluting and energy-saving pre-melting slag for producing hollow ingots by ingot-drawing electroslag remelting, the method is the same as that in Example 2, and its components are Weight percent is Al 2 O 3 19%, CaO36%, SiO 2 12%, MgO3%, the balance is CaF 2 and inevitable impurities; binary basicity CaO / SiO 2 is 3, the melting temperature is 1260~1280℃, and the resistivity at 1600℃ is 0.603Ω·cm;

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

[0038] During electroslag remelting, the amount of pre-melting 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 control of the melting furnace used is when extracting hollow ingots The pulling speed of the hollow ingot is 5~6 ...

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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-melting slag used for producing hollow ingots, in particular to a low-pollution and energy-saving slag system used for producing hollow ingots by ingot extraction type electroslag remelting. Background technique [0002] With the rapid development of nuclear power, thermal power, hydropower, petrochemical and other industries, the size requirements for large cylindrical forgings are getting higher and higher, and the quality requirements are getting higher and higher; 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 is complicated and the yield of forging materials is low, resulting in a lot of material waste. The large ingot-drawing electroslag remelting furnace can directly remelt hollow steel ingots with different diameters and lengths up to 6000mm or even longer, which ...

Claims

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Application Information

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Patent Type & Authority Patents(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 LIAONING
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