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Smelting method of electrode bar base metal and application of electrode bar base metal in electroslag remelting G20Cr2Ni4E steel

A smelting method, electroslag remelting technology, applied in the smelting of electrode rod base material, the application field of electroslag remelting G20Cr2Ni4E steel, can solve the problem of poor deoxidation effect of LF refining, incomplete floating of inclusions, and inclusion of oxidation system Problems such as excessive materials, to achieve the effect of improving the cleanliness level and finished product quality, improving the production process and technology, and improving metallurgical efficiency

Active Publication Date: 2022-02-01
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the existence of the G20Cr2Ni4E carburized bearing steel electroslag remelting electrode rod base material in the prior art, which has a high P content after tapping from the electric furnace, poor LF refining deoxidation effect, high oxygen content in molten steel, and deoxidation. High cost, incomplete floating of inclusions in the VD vacuum degassing stage, many oxidized inclusions in molten steel, and oxidation of molten steel due to air pollution in the pouring stage, resulting in the cleanliness of G20Cr2Ni4E carburized bearing steel in the subsequent electroslag remelting smelting Not high and there are defects, provide a method for smelting electrode rod base material and the application of the electrode rod base material in electroslag remelted G20Cr2Ni4E steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Electric furnace smelting: scrap iron, pig iron and ferroalloy are batched and then melted by electricity. Among them, the maximum size of scrap iron is 500mm, and the unit weight is 1000kg. The content of P in pig iron is 0.15% by mass, and the content of S is 0.03% by mass After the melting pool is formed in the furnace, start to blow oxygen to help the melting and control the P content in the molten steel in the early stage of oxidation 钢液 Carburizer carbon powder, 3kg / t 钢液 Al block, 17.5kg / t 钢液 Lime and 2.5kg / t 钢液 dolomite;

[0051] (2) LF Furnace Refining: Flow the molten steel smelted in the electric furnace into the LF furnace and control the temperature of the molten steel entering the LF furnace to ≥1540°C, and then follow the 3m / t 钢液 The standard is to feed Al wire into the molten steel, refine it under the condition of argon, and add 1kg / t in batches during the refining process 钢液 Steel slag (a mixture of alumina and calcium oxide) and 1kg / t 钢液 For C ...

Embodiment 2

[0056] (1) Electric furnace smelting: scrap iron, pig iron and ferroalloy are batched and then melted by electricity. Among them, the maximum size of scrap iron is 500mm, and the unit weight is 1000kg. The content of P in pig iron is 0.15% by mass, and the content of S is 0.03% by mass ,; After the molten pool is formed in the furnace, start blowing oxygen to help and control the P content in the molten steel in the early stage of oxidation to 钢液 Carburizer carbon powder, 3.25kg / t 钢液 Al block, 17.5kg / t 钢液 Lime and 2.5kg / t 钢液 dolomite;

[0057] (2) LF Furnace Refining: Flow the molten steel smelted in the electric furnace into the LF furnace and control the temperature of the molten steel entering the LF furnace to ≥1540°C, and then follow the 3.25m / t 钢液 The standard is to feed Al wire into the molten steel, refine it under the condition of argon, and add 1kg / t in batches during the refining process 钢液 Steel slag (a mixture of alumina and calcium oxide) and 1kg / t 钢液 For pow...

Embodiment 3

[0062] (1) Electric furnace smelting: scrap iron, pig iron and ferroalloy are batched and then melted by electricity. Among them, the maximum size of scrap iron is 500mm, and the unit weight is 1000kg. The content of P in pig iron is 0.15% by mass, and the content of S is 0.03% by mass ,; After the molten pool is formed in the furnace, start blowing oxygen to help the melting and control the P content in the molten steel in the early stage of oxidation to 钢液 Carburizer carbon powder, 3.25kg / t 钢液 Al block, 17.5kg / t 钢液 Lime and 2.5kg / t 钢液 dolomite;

[0063] (2) LF furnace refining: pour the molten steel smelted in the electric furnace into the LF furnace and control the temperature of the molten steel entering the LF furnace to ≥1540°C, and then follow the 3.125m / t 钢液 The standard is to feed Al wire into the molten steel, refine it under the condition of argon, and add 1kg / t in batches during the refining process 钢液Steel slag (a mixture of alumina and calcium oxide) and 1kg / t...

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Abstract

The invention relates to the technical field of ferrous metallurgy, and discloses a smelting method of an electrode bar base material and application of the electrode bar base material in electroslag remelting G20Cr2Ni4E steel. The method comprises the following steps: (1) electric furnace smelting: burdening, then performing power transmission melting to form a molten pool in a furnace, performing oxygen blowing fluxing, controlling the P content in molten steel in the early stage of oxidation to be less than 0.1% by mass, and controlling the C content in the molten steel to be 0.6-1% by mass when electric furnace smelting is finished; (2) LF furnace refining: feeding an Al wire according to 3-3.25 m / t of molten steel; (3) VD furnace refining: performing large-flow argon blowing for 15 min or longer, enabling the argon flow of large-flow argon blowing to be larger than or equal to 120 L / min, reducing the argon blowing flow to 20-40 L / min 1-2 min before vacuum breaking, and performing static argon blowing for 10 min or longer; and (4) pouring, wherein the argon pressure is controlled to be 0.2-0.5 MPa. Ab electrode bar smelted by the method is low in oxygen content and low in oxide inclusion content.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for smelting an electrode rod base material and the application of the electrode rod base material in electroslag remelted G20Cr2Ni4E steel. Background technique [0002] High-quality carburized bearing steel has excellent comprehensive mechanical properties such as impact resistance, good wear resistance, and contact fatigue resistance. The industrial field plays an irreplaceable role. Due to the current domestic smelting, there are many limitations of gas and impurity elements, and the difficulty of stable control of alloy elements. It is urgent to improve the problems of high oxygen content and excessive inclusions in the whole process of smelting electroslag carburized bearing steel. Therefore, high Quality carburized bearing steel cleaning control technology research can not only be applied to improve the smelting level of special steel enterprise...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/52C21C7/00C21C7/10C22B9/18C22C38/02C22C38/04C22C38/42
CPCC22C33/04C21C5/52C21C7/0056C21C7/10C22B9/18C22C38/02C22C38/04C22C38/42Y02P10/20
Inventor 尹仕伟张军
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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