A low-cost high-conductivity electrode flat steel and its smelting method

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 effect of improving conductivity, increasing production difficulty and cost

Active Publication Date: 2021-06-08
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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  • A low-cost high-conductivity electrode flat steel and its smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The low-cost 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 compo...

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 used in the electrolytic aluminum industry, and discloses a low-cost high-conductivity electrode flat steel and a smelting method thereof. The low-cost high-conductivity flat steel contains: C≤0.005% by weight percentage , Si≤0.05%, Mn≤0.15%, P≤0.02%, S≤0.01%, and the rest is Fe. The smelting method includes: smelting molten steel in a converter, LF refining, RH refining, and then rolling and forming; the electrode flat steel of the present invention has relatively low cost and high conductivity, and the resistivity δ≤12×10 ‑8 Ω·m (20°C), the low-cost and high-conductivity flat steel described in the present invention is used as the cathode material of electrolytic aluminum, which can greatly save electric energy in the production process of electrolytic aluminum, and greatly reduce the production cost of electrolytic aluminum. And achieved the best combination of low cost and high performance. The smelting method of the invention can accurately control the content of each component in the flat steel, reduce crystal defects, reduce resistance to the greatest extent, and improve conductivity under the premise of satisfying mechanical properties and processing properties.

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