Preparation and use method of a nickel-based rare earth magnesium master alloy for alloying molten steel

An intermediate alloy and rare earth magnesium technology, applied in the field of metallurgy, can solve the problems of poor deep desulfurization effect, low yield, high density of rare earth inclusions, etc., and achieve the effects of prolonging residence time, avoiding direct contact, and improving yield

Active Publication Date: 2021-11-30
NORTHEASTERN UNIV LIAONING +1
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of high density of rare earth inclusions, difficulty in floating and discharging, and poor deep desulfurization effect and low yield of magnesium in molten steel, the invention provides a nickel-based rare earth magnesium master alloy for alloying molten steel The method of preparation and use of nickel, rare earth and magnesium is used to make an alloy, and the alloying treatment is carried out through a specific device to give full play to the respective advantages and complementary shortcomings of rare earth and magnesium, so as to further improve the cleanliness level of molten steel and improve industrialization. The recovery rate of magnesium element in the application process

Method used

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  • Preparation and use method of a nickel-based rare earth magnesium master alloy for alloying molten steel
  • Preparation and use method of a nickel-based rare earth magnesium master alloy for alloying molten steel
  • Preparation and use method of a nickel-based rare earth magnesium master alloy for alloying molten steel

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Experimental program
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Effect test

Embodiment 1

[0042] The preparation method of the nickel-based rare earth magnesium master alloy for molten steel alloying is as follows:

[0043] Nickel, rare earth and magnesium are put into the crucible in the vacuum induction furnace, and the amount of nickel accounts for 60%, rare earth accounts for 30%, and magnesium accounts for 10% according to the mass percentage in all materials; the rare earth is lanthanum;

[0044] Start the vacuum induction furnace to heat up, and before the material in the crucible starts to melt, evacuate the vacuum induction furnace to keep the vacuum below 3Pa;

[0045] When the material in the crucible starts to melt, stop vacuuming, and let argon flow into the vacuum induction furnace until the pressure is 50000Pa;

[0046] When the material in the crucible is completely melted, keep it warm for 3 to 5 minutes, then pour it, and obtain a nickel-based rare earth-magnesium master alloy for molten steel alloying after cooling, with a rare earth yield of 97%...

Embodiment 2

[0053] Preparation method is with embodiment 1, and difference is:

[0054] (1) nickel accounts for 50% by mass percentage in all materials, rare earth accounts for 35%, and magnesium accounts for 15%; Rare earth is cerium;

[0055] (2) Infuse argon until the pressure is 60000Pa;

[0056] (3) When the material in the crucible is completely melted, keep it warm for 3 to 5 minutes, then cast it, and obtain a nickel-based rare earth-magnesium master alloy for alloying molten steel after cooling, with a rare earth yield of 95% and a magnesium yield of 70%;

[0057] Using method is the same as embodiment 1, and difference is:

[0058] (1) The addition of magnesium and rare earth in the block alloy is 0.1% of the total mass of molten steel, and keeps for 4min;

[0059] (2) The soft blowing time is 20min; the rare earth yield is 26.5%, and the magnesium yield is 18.8%;

[0060] (3) The mass fraction of O in molten steel before adding block alloy is 0.0018%, the mass fraction of S ...

Embodiment 3

[0062] Preparation method is with embodiment 1, and difference is:

[0063] (1) nickel accounts for 40% by mass percentage in the whole material, rare earth accounts for 40%, and magnesium accounts for 20%; Rare earth is lanthanum and cerium of equal quality;

[0064] (2) Infuse argon until the pressure is 70000Pa;

[0065] (3) When the material in the crucible is completely melted, keep it warm for 3 to 5 minutes, then cast it, and obtain a nickel-based rare earth-magnesium master alloy for alloying molten steel after cooling, with a rare earth yield of 96% and a magnesium yield of 68%;

[0066] Using method is the same as embodiment 1, and difference is:

[0067] (1) The addition of magnesium and rare earth in the bulk alloy is 0.15% of the total mass of the molten steel, and keeps for 5 minutes;

[0068] (2) The soft blowing time is 18min; the rare earth yield is 29.3%, and the magnesium yield is 16.1%;

[0069] (3) The mass fraction of O in molten steel before the addit...

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Abstract

A method for preparing and using a nickel-based rare earth-magnesium master alloy for molten steel alloying. The preparation method is as follows: (1) putting nickel, rare earth and magnesium into a crucible in a vacuum induction furnace; (2) starting the vacuum induction furnace to carry out Raise the temperature and evacuate to below 3Pa before the material melts; (3) Stop vacuuming when the material melts and inject argon; (4) The material is completely melted and heat-preserved and poured. The method of use is: (1) The intermediate alloy is crushed; (2) The block alloy is placed in the press-in device, and the press-in device is fixed with the heavy lump; (3) After the molten steel has completed the refining and degassing process, the heavy lump is lifted Lifting and falling to press block alloy into molten steel; (4) Soft blowing and pouring. The preparation method of the present invention can increase the average density of the master alloy, is beneficial to prolong the residence time of the master alloy in molten steel, and contributes to a more sufficient reaction of rare earth and magnesium, and the method of use avoids the direct contact between the master alloy and slag and air The contact improves the yield of nickel-based rare earth-magnesium master alloy.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing and using a nickel-based rare earth magnesium master alloy for alloying molten steel. Background technique [0002] Rare earth and magnesium are important microalloying elements in steel, which can not only purify molten steel, modify inclusions, but also improve the structure and performance; however, there are the following problems in separate rare earth treatment or magnesium treatment: (1) when added alone For rare earth, although rare earth has strong thermodynamic binding ability with oxygen and sulfur, the density of rare earth inclusions generated in steel is relatively high, which is close to the density of molten steel, and it is difficult to float up and discharge, which is not conducive to impurity elements such as oxygen and sulfur in steel. (2) When magnesium is added alone, although the density of magnesium-containing inclusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00C22C33/06
CPCC22C33/06C22C35/00
Inventor 姜周华董君伟杨帆耿鑫田家龙姜骁箐
Owner NORTHEASTERN UNIV LIAONING
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