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Low-cost high-conductivity electrode flat steel and smelting method thereof

A high-conductivity, electrode flat steel technology, applied in the direction of improving process efficiency, can solve problems such as restricting development and unable to reduce production costs, and achieve the effects of improving purity, reducing crystal defects, and reducing production costs

Active Publication Date: 2019-08-30
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrode flat steel materials commonly used at this stage include Q195 steel, Q215 steel and Q235 steel, etc. Their conductivity restricts the further reduction of the production cost of electrolytic aluminum; there is also high-conductivity electrode flat steel added with expensive rare earth elements, although the resistance The high price of rare earth metals cannot reduce the production cost
These kinds of materials restrict their further development in terms of electrical conductivity or production cost, and the existing technology cannot solve the above technical problems

Method used

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  • Low-cost high-conductivity electrode flat steel and smelting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The low-cost and high-conductivity flat steel described in this embodiment contains 0.004% by weight of C, 0.05% of Si, 0.14% of Mn, 0.02% of P, 0.01% of S, and the rest is Fe.

[0033] Embodiment 1 smelting method comprises the steps:

[0034] (1) Mix hot-charged molten iron with scrap steel to obtain initial molten steel. The initial molten steel is mixed with hot charging molten iron and scrap steel in proportion, and the weight of scrap steel does not exceed 15% of the total amount added. Before the initial molten steel enters the converter, the content of Si is 0.04%, the content of P is 0.01%, the content of S is 0.05%, and the temperature of the molten steel is 1500°C.

[0035] (2) The molten steel in step (1) is transferred to the converter through the mixed iron furnace and smelted at 1655 ° C for 30 minutes; when tapping, the synthetic slag accounting for 0.3% of the mass of the molten steel at the time of tapping is slag washed, and the synthetic slag The c...

Embodiment 2

[0040] The low-cost and high-conductivity flat steel described in this embodiment contains 0.005% by weight of C, 0.03% of Si, 0.1% of Mn, 0.015% of P, 0.009% of S, and the rest is Fe.

[0041]The smelting method of embodiment 2 comprises the steps:

[0042] (1) Mix hot-charged molten iron with scrap steel to obtain initial molten steel. The initial molten steel is mixed with hot charging molten iron and scrap steel in proportion, and the weight of scrap steel does not exceed 15% of the total amount added. Before the initial molten steel enters the converter, the content of Si is 0.03%, the content of P is 0.008%, the content of S is 0.05%, and the temperature of the molten steel is 1450°C.

[0043] (2) The molten steel in step (1) is transferred to the converter through the mixed iron furnace and smelted at 1660 ° C for 32 minutes; when tapping, add synthetic slag accounting for 0.4% of the mass of the molten steel at the time of tapping for slag washing, and the synthetic s...

Embodiment 3

[0048] The low-cost and high-conductivity flat steel described in this embodiment contains 0.005% by weight of C, 0.05% of Si, 0.12% of Mn, 0.02% of P, 0.008% of S, and the rest is Fe.

[0049] The smelting method of embodiment 3 comprises the steps:

[0050] (1) Mix hot-charged molten iron with scrap steel to obtain initial molten steel. The initial molten steel is mixed with hot charging molten iron and scrap steel in proportion, and the weight of scrap steel does not exceed 15% of the total amount added. Before the initial molten steel enters the converter, the content of Si is 0.02%, the content of P is 0.008%, the content of S is 0.05%, and the temperature of the molten steel is 1600°C.

[0051] (2) The molten steel in step (1) is transferred to the converter through the mixing furnace and smelted at 1665°C for 34 minutes; when tapping, add synthetic slag accounting for 0.35% of the mass of the molten steel at the time of tapping for slag washing, and the synthetic slag ...

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Abstract

The invention belongs to the field of electrode flat steel for aluminum electrolysis industry, and discloses low-cost high-conductivity electrode flat steel and a smelting method thereof. The low-costhigh-conductivity electrode flat steel contains, by weight: less than or equal 0. 005% of C, less than or equal 0.05% of Si, less than or equal 0.15% of Mn, less than or equal 0.02% of P, less than or equal 0.01% of S, and the balance Fe. The smelting method comprises the following steps: converter smelting, LF refining, RH refining of molten steel, and rolling forming. The electrode flat steel has lower cost and higher conductivity, and the resistivity delta is less than or equal to 12*10<-8> omega.m (20 DEG C). The low-cost and high-conductivity flat steel is used as a cathode material of aluminum electrolysis process, and can greatly save electric energy in the production process, greatly reduce production cost of aluminum electrolysis, and achieve the optimum combination of low cost and high performance. The smelting method can accurately control content of each component in the flat steel, and reduce crystal defects under the premise of satisfying mechanical properties and processing performance; electric resistance is reduced to the greatest extent; and electrical conductivity is improved.

Description

technical field [0001] The invention relates to the field of electrode flat steel used in the electrolytic aluminum industry, in particular to a low-cost high-conductivity electrode flat steel and a smelting method thereof. Background technique [0002] Electrode flat steel is a consumable material used in electrolytic aluminum plants for cathode conductive rods. With the development of the electrolytic aluminum industry, the market demand for electrode flat steel is also increasing. The electrode flat steel materials commonly used at this stage include Q195 steel, Q215 steel and Q235 steel, etc. Their conductivity restricts the further reduction of the production cost of electrolytic aluminum; there is also high-conductivity electrode flat steel added with expensive rare earth elements, although the resistance The rate is reduced, and the expensive price of rare earth metals cannot reduce production costs. These kinds of materials restrict their further development in term...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C33/06C21C7/10C21D8/06
CPCC21C7/10C21D8/065C22C33/06C22C38/002C22C38/004C22C38/02C22C38/04Y02P10/20
Inventor 刘鹏唐兴昌
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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