A method for improving the recovery rate of magnesium element in molten steel

A technology of magnesium element and recovery rate, applied in the field of metallurgy, can solve problems such as the inability to effectively increase the magnesium content of molten steel, reduce the original input amount of alloy, and violent tumbling of molten steel, and achieve grain refinement, improve wear resistance, and mesh The effect of carbide reduction

Active Publication Date: 2019-03-12
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After being added to the molten steel, violent reactions will occur, and the safety of the operation is low. The molten steel rolls violently and even splashes and explodes.
Therefore, using the metal magnesium currently on the market will inevitably reduce the original input amount of the alloy, and it is also impossible to effectively increase the magnesium content in the molten steel

Method used

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  • A method for improving the recovery rate of magnesium element in molten steel
  • A method for improving the recovery rate of magnesium element in molten steel
  • A method for improving the recovery rate of magnesium element in molten steel

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for improving the yield of magnesium element in molten steel comprises the following steps:

[0031] a. First, iron powder and nickel powder are mixed with magnesium powder at a ratio of 1:4, and die-cast into small blocks, in which magnesium accounts for 6% of the alloy.

[0032] b. Put the smelting raw materials into the MgO crucible of the pressurized induction furnace, the raw materials include industrial pure iron, industrial silicon, metal manganese, metal chromium, metal molybdenum and ferrovanadium;

[0033] c. Start the external air extraction system to vacuum the system, and control the vacuum degree within 10Pa;

[0034] d. After all the smelting raw materials are melted, argon gas is introduced, pressurized to 0.5MPa, and then the pre-treated Fe-Ni-Mg alloy in a is added in batches from the feeding port of the silo, and each addition does not exceed 25g , the amount of Fe-Ni-Mg alloy added per ton of molten steel is 13kg;

[0035] e. After holding...

Embodiment 2

[0038] A method for improving the yield of magnesium element in molten steel comprises the following steps:

[0039] a. First, iron powder and nickel powder are mixed with magnesium powder at a ratio of 1:1, and die-cast into small pieces, in which magnesium accounts for 4% of the alloy.

[0040] b. Put the smelting raw materials into the MgO crucible of the pressurized induction furnace, the raw materials include industrial pure iron, industrial silicon, metal manganese, metal chromium, metal molybdenum and ferrovanadium;

[0041] c. Start the external pumping system, vacuum the system, control the vacuum within 10Pa, and then pass in argon to pressurize to 1.0MPa;

[0042] d. After the smelting raw materials are melted, argon gas is introduced, pressurized to 1.0MPa, and then the Fe-Ni-Mg alloy pre-treated in a is added in batches from the feeding port of the silo, each time adding no more than 25g, each The amount of Fe-Ni-Mg alloy added per ton of molten steel is 16kg;

...

Embodiment 3

[0046] A method for improving the yield of magnesium element in molten steel comprises the following steps:

[0047] a. Mix iron powder and nickel powder with magnesium powder at a ratio of 1:1, and die cast into small pieces, in which magnesium accounts for 4% of the alloy.

[0048] b. Put the smelting raw materials into the MgO crucible of the pressurized induction furnace, the raw materials include industrial pure iron, industrial silicon, metal manganese, metal chromium, metal molybdenum and ferrovanadium;

[0049] c. Start the external pumping system, vacuum the system, control the vacuum within 10Pa, and then pass in argon to pressurize to 2.0MPa;

[0050] d. After the smelting raw materials are melted, argon gas is introduced, and the pressure is increased to 2.0MPa, and then the pre-treated Fe-Ni-Mg alloy in a is added in batches from the feeding port of the silo, and each addition does not exceed 25g. The amount of Fe-Ni-Mg alloy added per ton of molten steel is 16kg...

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Abstract

The invention provides a method for increasing yield of magnesium elements in molten steel. The method comprises the following steps: firstly, a proper amount of iron powder is mixed with nickel powder and magnesium powder according to a certain ratio to save the cost, and is formed by die casting; then, smelting raw materials are fed in a pressing induction furnace, and the raw materials include industrial pure iron, industrial silicon, metal manganese, metal chromium, metal molybdenum and ferrovanadium; a system is vacuumized, and the vacuum degree is controlled within 10 Pa; after the smelting raw materials are molten, argon is introduced to press the system, and then, treated Fe-Ni-Mg alloys are fed in batches by a bin charging port; and finally, after the pressure is kept by 30-40 min, the pressure is reduced for discharge from a furnace. The method prominently increases the yield of magnesium in the molten steel, stably and effectively recovers magnesium from the molten steel, saves the cost, and is liable to operate. On the structure performance of the steel, the alloy structural steel after the magnesium treatment achieves such obvious optimizations as grain refining and netty carbide reduction, so that such performances as wear resistance, strength, toughness and fatigue life of the alloy structural steel are preferably improved under the condition of reducing the cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a high-magnesium alloy structural steel, in particular to a method for increasing the yield of magnesium element in molten steel. Background technique [0002] Magnesium has a significant effect on removing inclusions in molten steel, mainly because magnesium has a strong affinity with sulfur and oxygen, and it is easy to form inclusions containing magnesium, which helps to accelerate the floating of inclusions and improve the quality of steel. Secondly, magnesium can denature the inclusions and make the inclusions harmless; in addition, magnesium can also purify the grain boundaries, improve the grain boundary strength of steel, and thus improve the performance of steel. [0003] Because the vapor pressure of metal magnesium is very high, and the reaction of magnesium is very violent at the temperature of steelmaking, a better process for adding magnesium to steel has not been d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/10
CPCC21C7/0006C21C7/10
Inventor 李阳王亚峰姜周华徐光陈常勇吕剑波胡浩梁轶杰姚聪林
Owner NORTHEASTERN UNIV LIAONING
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