Method for controlling residual aluminum in electroslag remelting steel

A control method and residual aluminum technology, which are applied in the field of electroslag remelting, can solve the problems of easy occurrence of aluminum increase in metal molten pool, difficult control of electroslag steel and aluminum, poor quality of electroslag steel, etc., so as to achieve good product quality and improve quality. , the effect of increasing power consumption

Inactive Publication Date: 2012-11-28
ZHEJIANG ELECTROSLAG NUCLEAR MATERIAL
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the poor stability of the remelting slag system in the existing electroslag remelting technology, the metal molten pool is prone to increase aluminum during the remelting process, the residual aluminum in the electroslag steel is difficult to control, and the quality of the electroslag steel is poor. Provides a method for controlling the residual aluminum in the electroslag steel with good stability of the heavy slag system, the metal molten pool is not easy to increase aluminum, the residual aluminum in the electroslag steel is easy to control, and the electroslag steel has good quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention is a re -melting 10 -ton steam turbine rotor electric slag steel ingot (30cr2ni4mov).The aluminum content in the self -consuming electrode is 0.005%.The composition of heavy slag system is: CAO 32%, al 2 O 3 12%, MNO 0.3%, CAF 2 20%, al 2 (SIO 3 Cure 3 35.7%, the CAO uses active metallurgical lime, of which S content ≤0.01%, CAO purity ≥96%, Al 2 O 3 Using Bai Gangyu, the purity of MNO ≥98%, CAF 2 Use fluorite.The slag material is cleaned, the residue depth is 230mm, the self-consuming electrode diameter is 500mm. During the melting process, the residue temperature is 1600 ~ 1680 ° C, and the Mn-CA alloy is used as a desertent (Mn-CA alloy from commercially available).KG / ton electric slag steel, the deoxida is continuously and uniformly added in the mechanical method, and the FEO content in the heavy slag is controlled within the range of 0.3 ~ 0.4%.The AL content in electric slag steel is 0.005 ~ 0.007%, the O content is 18 ~ 20ppm, the H content is 4...

Embodiment 2

[0019] The invention of the invention has a 15 -ton nuclear power slag steel ingot (00CR17NI14MO2).The self -consuming electrode is high -aluminum self -consuming electrode, of which the aluminum content is 0.04%.The composition of heavy slag system is: CAO 28%, al 2 O 3 10%, MNO 0.2%, CAF 2 15%, the balance is Al 2 (SIO 3 Cure 3 The CAO uses active metallurgical lime, of which the S content ≤0.01%, CAO purity ≥96%, Al 2 O 3 Use aluminum oxygen powder, the purity of MNO ≥98%, CAF 2 Use fluorite.The slag material is cleaned, the residue depth is 250mm, the self-consuming electrode diameter is 620mm. During the melting process, the residue temperature is 1600 ~ 1680 ° C, and the Mn-CA alloy is used as a deoxidant (MN-CA alloy from being commercially available). The amount is 1kg of 1kgThe / ton electric slag steel, the dehydration agent is continuously and uniformly added, and the FEO content in the heavy slag is controlled within 0.3 ~ 0.4%.The AL content in electric slag steel is ...

Embodiment 3

[0021] Use the invention to melt 40 tons of rolling steel (70CR3MO) electric slag ingots. It uses 10 self -consuming electrodes, which weighs 4.2 tons each, and the diameter of the self -consuming electrode is 500mm.The range of AL is between 0.005 ~ 0.05%, and the composition of heavy slag systems is: CAO 35%, AL 2 O 3 13%, MNO 0.35%, CAF 2 18%, the balance is al 2 (SIO 3 Cure 3 The CAO uses active metallurgical lime, of which the S content ≤0.01%, CAO purity ≥96%, Al 2 O 3 Using Bai Gangyu, the purity of MNO ≥98%, CAF 2Use fluorite.The slag material is clear, the depth of the residue is 300mm, and the residue temperature during the melting process is 1700 ~ 1750 ° C.It accounts for one -half of the melting period, and the dosage is 1.0kg / electric slag steel. The dehydration agent is continuously and uniformly added by mechanical methods. The FEO content in the heavy residue is controlled within 0.3 ~ 0.5%.The AL content in electric slag steel is 0.007 ~ 0.008%, the O content is...

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Abstract

The invention relates to the electroslag remelting technology, in particular to a method for controlling residual aluminum in electroslag remelting steel, and aims to overcome the disadvantages of the prior electroslag remelting technology, such as poor stability of remelting slag system, poor efficiency in controlling aluminum increase in metal melting pond in remelting process, high difficulty in controlling residual aluminum in electroslag remelting steel, and poor quality of electroslag remelting steel. The control method is realized by the electroslag remelting process in the existing electroslag furnace, wherein the remelting slag consists of, by weight, CaO 28% to 40%, Al2O3 10% to 15%, MnO 0.2% to 0.5%, CaF2 15% to 25%, and the balance of Al2(SiO3)3. In the remelting process, the content of FeO in the remelting slag is controlled to be not larger than 0.5% by deoxidization. The method provided by the invention is effective in controlling aluminum increase in the metal melting pond, and easy in controlling residual aluminum in the electroslag remelting steel, and has the advantages of high stability of the remelting slag system and high quality of electroslag remelting steel.

Description

Technical field [0001] The present invention involves a method of re -melting of electric slag, especially the control method that involves a dregs steel residual aluminum. Background technique [0002] The adverse effects of aluminum on the intensity and fracture toughness make the turbine rotor rotor steel, thermal strong steel and high -temperature alloy strictly restricted aluminum content, and generally do not allow more than 0.010%.As a kind of residual element in metal materials, aluminum content exceeds 0.010%, mostly about 0.035%.Using general electric residue remodeling technology, when the residual aluminum consumption in the self -consuming electrode is low, even if the aluminum -containing oxygen is not added during the melting process, at least 20%of AL2O3 in the slag, the metal melting pond also increased increaseAluminum, even in the case of large amounts of active elements such as silicon and manganese; when the aluminum consumption in the self -consuming electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor 向大林辜荣如
Owner ZHEJIANG ELECTROSLAG NUCLEAR MATERIAL
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