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Method for smelting medium-high alloy low-phosphorous steel through electric furnace with high molten iron proportion

An electric furnace smelting and low-phosphorus steel technology, which is applied in the field of iron and steel metallurgy, can solve the problems of long production cycle, difficult dephosphorization, and difficulty in achieving rapid dephosphorization, and achieve the effect of efficient dephosphorization and reduced steelmaking costs

Active Publication Date: 2017-03-29
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The conventional electric furnace production process either has a long production cycle or is difficult to dephosphorize, making it difficult to achieve the purpose of rapid dephosphorization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present invention uses following steelmaking equipment and smelting steel types:

[0031] A Siemens VAI ultra-high power electric arc furnace with a nominal capacity of 120 tons is used, with 4 furnace wall oxygen lances, the smelted steel is H13, and its main components are C: 0.32-0.45%, Si: 0.80-1.20%, Mn: 0.20-0.60%, Cr: 4.75-5.50%, P: ≤0.013%, Mo: 1.10-1.75%, V: 0.80-1.20%.

[0032] Add 1.5t of lime into the furnace before feeding, unscrew the furnace cover and start adding 35t of scrap steel, then screw in the furnace cover, start power transmission, and drive the molten iron truck into the furnace door at the same time, start mixing 85.3t of molten iron into the furnace, and The multifunctional cluster oxygen lance is adjusted to the burner mode, at this time, the oxygen flow rate is 360Nm 3 / h, the gas flow rate is 300Nm 3 / h, power off after 1 minute of power supply, adjust the multi-functional cluster oxygen gun to execute the refining hypoxic mode, and ...

Embodiment 2

[0036] The present invention uses following steelmaking equipment and smelting steel types:

[0037]A Siemens VAI ultra-high power electric arc furnace with a nominal capacity of 120 tons is used, with 4 furnace wall oxygen lances, the smelted steel is 70Cr3NiMo, and its main components are C: 0.58-0.70%, Si: 0.40-0.70%, Mn: 0.40-0.70%, Cr: 3.0-3.40%, P: ≤0.012%, Mo: 0.60-0.80%, Ni: 0.50-1.00, V: 0.05-0.15%.

[0038] Add 1.45t of lime into the furnace before feeding, unscrew the furnace cover and start adding 41.2t of scrap steel, then screw in the furnace cover, start power transmission, and drive the molten iron car into the furnace door at the same time, start mixing 79.6t of molten iron into the furnace, and Adjust the multifunctional cluster oxygen lance to the burner mode, at this time, the oxygen flow rate is 380Nm 3 / h, the gas flow rate is 320Nm 3 / h, power off after 1 minute of power supply, adjust the multi-functional cluster oxygen gun to execute the refining hyp...

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Abstract

The invention discloses a method for smelting medium-high alloy low-phosphorous steel through an electric furnace with a high molten iron proportion. Through strictly control over oxygen blowing, power transmission and feeding processes during smelting of the electric furnace, the purposes of efficient smelting, energy saving and consumption reducing are achieved. The method includes the detailed steps that the proportion of molten iron entering the furnace is controlled to be 60-80%, steel scraps are added into the furnace at a time through a basket, the molten iron enters from a door of the furnace through a molten iron adding trolley during power transmission, the flow of a multifunctional bundling oxygen lance is reasonably adjusted, power supply time is dynamically controlled, lime is supplemented into the furnace in batches in combination with an automatic feeding system, and therefore molten steel rapidly meets the requirements for components and temperature needed by a steel grade. Compared with a common electric furnace technology, the time consumed for adding the molten iron is shortened, and the smelting efficiency of the electric furnace is improved; the power supply time of the electric furnace is quite short, and therefore the energy consumption of steel smelting is lowered; during smelting of the electric furnace, efficient dephosphorizing and decarbonizing are achieved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a method for smelting medium-high alloy low-phosphorus steel (alloy content ≥ 5wt%) in an electric furnace under the condition of high molten iron ratio. Background technique [0002] The electric furnace all-scrap smelting process needs to be energized throughout the process to melt the scrap and heat up for decarburization, which consumes a lot of electric energy and takes a long time to smelt. Due to the shortage of steel scrap resources in China, the price remains high, and the chemical composition in scrap steel is difficult to monitor and harmful elements are difficult to remove. It is very difficult to smelt high value-added products from all scrap steel. [0003] With the intensification of competition in the metallurgical industry at home and abroad, in order to reduce production consumption and improve production efficiency, domestic electric furnace...

Claims

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Application Information

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IPC IPC(8): C21C5/52
CPCC21C5/52Y02P10/20
Inventor 刘兵戈文英李金浩袁淑君吕安明谷岩
Owner SHANDONG IRON & STEEL CO LTD
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