CN110004269B - Production method of aluminum-free medium-high carbon steel - Google Patents

Production method of aluminum-free medium-high carbon steel Download PDF

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Publication number
CN110004269B
CN110004269B CN201910398173.6A CN201910398173A CN110004269B CN 110004269 B CN110004269 B CN 110004269B CN 201910398173 A CN201910398173 A CN 201910398173A CN 110004269 B CN110004269 B CN 110004269B
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steel
carbon
slag
deoxidizer
silicon
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CN110004269A (en
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梅雪辉
吴春杰
臧绍双
李德军
周福鼎
王小善
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/36Processes yielding slags of special composition
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/064Dephosphorising; Desulfurising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting

Abstract

The invention relates to a production method of aluminum-free medium-high carbon steel, wherein the carbon content of the aluminum-free medium-high carbon steel is not less than 0.35 percent by mass, and the production method comprises the following steps: desulfurizing molten iron, and tapping steel with carbon left in the converter without adding a silicon deoxidizer; adding slag and carbon deoxidizer after molten steel enters an LF furnace treatment position; heating the electrode, and deoxidizing the carbide slag at high temperature by using lime, a carbon deoxidizer and an electric arc. The advantages are that: the invention controls SiO in the top slag of molten steel by not adding silicon deoxidizer in the converter2The content is not more than 10% of the total slag amount, and the fluorite is completely replaced by bauxite or a slagging material taking the bauxite as the main component, so that the melting temperature of the top slag is lower, and the slagging is facilitated. The steel grade such as heavy rail steel, cord steel and the like is favorably improved in quality because fluorite is not used and the oxidation of silicon is reduced.

Description

Production method of aluminum-free medium-high carbon steel
Technical Field
The invention belongs to the technology of steelmaking continuous casting refining treatment, and particularly relates to a production method of aluminum-free medium-high carbon steel.
Background
The production process of the aluminum-free medium-high carbon steel mainly adopts a converter-LF furnace-continuous casting machine process. The liquidus temperature of the non-aluminum medium-high carbon steel grade is low, and slag of the LF furnace is difficult to melt. Wherein, the slagging agent of the LF furnace mainly adopts fluorite, and the slagging agent is difficult to adopt other slagging agents, has large dosage and low alkalinity of top slag, and is not beneficial to desulfurization. Causing huge fluorite consumption of steel plants. Although fluorite has good slag melting effect, fluorite pollutes the environment, harms the human health and is a non-renewable resource.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for producing aluminum-free medium-high carbon steel, which cancels the use of fluorite by controlling the oxidation of silicon in molten steel, adopts bauxite or slag melting materials taking the bauxite as the main component to completely replace the fluorite, ensures that the melting temperature of top slag is lower, and does not influence the slag melting of an LF furnace. Is beneficial to realizing the green and environment-friendly production of steel and protecting the limited fluorite resource.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a production method of aluminum-free medium-high carbon steel comprises the following steps of:
1) making steel
a, desulfurizing molten iron, wherein S in the desulfurized molten iron is less than 0.020%;
b, remaining carbon in the converter for tapping, wherein the mass percent of the carbon content at the end point is controlled according to the mass percent of more than or equal to 0.05 percent and less than or equal to-0.06 percent of the carbon upper limit of a finished product;
c, no silicon deoxidizer is added into the converter; the clearance of the molten steel tank is controlled to be 400mm-600 mm;
2) refining
a, after molten steel enters an LF furnace treatment position, firstly adding a first batch of slag material to dilute the oxidability of top slag in a molten steel tank, and then adding a carbon deoxidizer;
b, heating the electrode, namely performing deoxidation by using the lime, a carbon deoxidizer and the high temperature of the electric arc to generate carbide slag, adding two batches of slag materials in the heating process, wherein the weight ratio of the lime to the slag melting agent in the two batches of slag materials is controlled to be 2: 1-3: 1; controlling the amount of the slag charge of the second batch to be 0-6 kg/ton steel;
c, after the temperature is raised, adding a deoxidizing agent for final deoxidation, desulfurization, taking a process sample, alloying according to the process sample, finally adjusting the components, and casting on a machine.
The slag melting agent in the step 2) is bauxite or a slag melting material taking bauxite as a main component; the carbon deoxidizer is a coke carburant or a petroleum coke carburant.
The first batch of slag charge and the adding amount of the slag charge are 4-5 kg of lime per ton of steel and 2-2.5 kg of slag melting agent per ton of steel; the addition amount of the carbon deoxidizer is as follows: the amount of molten steel is x (the upper limit of finished carbon-the carbon content in molten steel is-0.03%)/the carbon deoxidizer carbon content.
The deoxidizer in the step 2) c is ferrosilicon; adding the first batch of ferrosilicon after temperature rise: the molten steel amount is multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon-iron content.
Compared with the prior art, the invention has the beneficial effects that:
the invention controls the molten steel top slag without adding silicon deoxidizer in the converterSiO of (2)2The content is not more than 10% of the total slag amount, the use of fluorite is cancelled, and bauxite or a slagging material taking the bauxite as a main component is used for completely replacing the fluorite, so that the melting temperature of top slag is lower, and the slagging is facilitated. The steel grade such as heavy rail steel, cord steel and the like is favorably improved in quality because fluorite is not used and the oxidation of silicon is reduced. Reduce the environmental pollution caused by using fluorite and protect the limited fluorite resource. The present invention utilizes the existing production equipment to add carbon deoxidizer, lime and bauxite into molten steel, and utilizes the carbon deoxidizer, lime and electrode to raise the temperature to make carbide slag and deoxidize. The proportion of lime of the first batch of slag material of the LF furnace and the slag melting agent is controlled, so that the manufactured carbide slag has good submerged arc. The electrode temperature rise efficiency can be improved. And an electrode heating mode is adopted, and the heating rate of the LF furnace is increased from 3-5 ℃/min to 4-6 ℃/min.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A production method of aluminum-free medium-high carbon steel comprises the following steps of:
1) making steel
a, desulfurizing molten iron, wherein S in the desulfurized molten iron is less than 0.020%;
b, remaining carbon in the converter for tapping, wherein the mass percent of the carbon content at the end point is controlled according to the mass percent of more than or equal to 0.05 percent and less than or equal to-0.06 percent of the carbon upper limit of a finished product;
c, no silicon deoxidizer is added into the converter; the clearance of the molten steel tank is controlled to be 300mm-600 mm;
2) refining
a, after molten steel enters an LF furnace treatment position, firstly adding a first batch of slag material to dilute the oxidability of top slag in a molten steel tank, and then adding a carbon deoxidizer;
b, heating the electrode for 5-10 minutes, performing high-temperature acetylene sludge deoxidation by using lime, a carbon deoxidizer and an electric arc, adding two batches of slag materials in the heating process, and controlling the weight ratio of the lime to the slag melting agent in the two batches of slag materials to be 2: 1-3: 1; controlling the amount of the slag charge of the second batch to be 0-6 kg/ton steel;
c, after the temperature is raised, adding a deoxidizing agent for final deoxidation, desulfurization, taking a process sample, alloying according to the process sample, finally adjusting the components, and casting on a machine.
The slag melting agent in the step 2) is bauxite or a slag melting material taking bauxite as a main component; the carbon deoxidizer is a coke carburant or a petroleum coke carburant.
The first batch of slag charge and the adding amount thereof in the step 2) are 4-5 kg of lime per ton of steel and 2-2.5 kg of slag melting agent per ton of steel; the addition amount of the carbon deoxidizer is as follows: the amount of molten steel is x (the upper limit of finished carbon-the carbon content in molten steel is-0.03%)/the carbon deoxidizer carbon content.
The deoxidizer c in the step 2) is ferrosilicon; adding the first batch of ferrosilicon after temperature rise: the molten steel amount is multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon-iron content.
Example one
A production method of aluminum-free medium-high carbon steel is provided, wherein the mass percentage of the upper limit of the carbon content of the medium-high carbon steel is 0.35%, and the production method comprises the following steps:
1. steel-making process
1) Desulfurizing the molten iron, wherein the S content in the desulfurized molten iron is 0.015 percent;
2) the end point carbon content of the converter is 0.15 percent;
3) the converter does not add silicon deoxidizer; the clearance of the molten steel tank is 400 mm;
2. refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4 kg/ton of steel white ash and 2 kg/ton of steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is multiplied by the amount of the molten steel (the upper carbon limit of a finished product-the carbon content in the molten steel is-0.03%)/the carbon deoxidizer carbon content.
2) Heating the electrode for 9 minutes, and blowing argon: 200L/min.
3) After the temperature is raised, the adding amount of the first batch of ferrosilicon is the molten steel amount multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon content of the ferrosilicon.
4) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
5) After molten steel is alloyed, feeding a silicon-calcium wire of 1.5 m/ton steel, and blowing argon for 3 minutes to machine.
Example two
A production method of aluminum-free medium-high carbon steel is provided, wherein the mass percentage of the upper limit of the carbon content of the medium-high carbon steel is 0.50%, and the production method comprises the following steps:
1. steel-making process
1) Desulfurizing the molten iron, wherein S in the desulfurized molten iron is 0.018%;
2) the end point carbon content of the converter is 0.25 percent;
3) the converter does not add silicon deoxidizer; the clearance of the molten steel tank is 600 mm;
2. refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4.5 kg/ton steel white ash and 2.5 kg/ton steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (finished carbon upper limit-carbon content in molten steel-0.03%)/carbon deoxidizer carbon content; .
2) Heating the electrode for 8 minutes, and blowing argon: 300L/min.
3) After the temperature is raised, the adding amount of the first batch of ferrosilicon is the molten steel amount multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon content of the ferrosilicon.
4) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
5) After molten steel is alloyed, feeding a 1 m/ton steel silicon-calcium wire, and blowing argon for 3 minutes to machine.
EXAMPLE III
A production method of aluminum-free medium-high carbon steel is provided, wherein the mass percentage of the upper limit of the carbon content of the medium-high carbon steel is 0.60%, and the production method comprises the following steps:
1. steel-making process
1) Desulfurizing molten iron, wherein S in the desulfurized molten iron is 0.017 percent;
2) the end point carbon content of the converter is 0.40 percent;
3) the converter does not add silicon deoxidizer; the clearance of the molten steel tank is 600 mm;
2. refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4.7 kg/ton steel white ash and 2.3 kg/ton steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (finished carbon upper limit-carbon content in molten steel-0.03%)/carbon deoxidizer carbon content; .
2) Heating the electrode for 10 minutes, and blowing argon: 260L/min.
3) After the temperature is raised, the adding amount of the first batch of ferrosilicon is the molten steel amount multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon content of the ferrosilicon.
4) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
5) After molten steel is alloyed, feeding a 1 m/ton steel silicon-calcium wire, and blowing argon for 3 minutes to machine.
Example four
A production method of aluminum-free medium-high carbon steel is provided, wherein the mass percentage of the upper limit of the carbon content of the medium-high carbon steel is 0.75%, and the production method comprises the following steps:
1. steel-making process
1) Desulfurizing the molten iron, wherein S in the desulfurized molten iron is 0.019%;
2) the end point carbon content of the converter is 0.50 percent;
3) the converter does not add silicon deoxidizer; the clearance of the molten steel tank is 500 mm;
2. refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (5 kg/ton of steel white ash and 2.5 kg/ton of steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (the upper limit of finished carbon-the carbon content in the molten steel is-0.03%)/the carbon deoxidizer carbon content; .
2) Heating the electrode for 9 minutes, and blowing argon: 280L/min.
3) After the temperature is raised, the adding amount of the first batch of ferrosilicon is the molten steel amount multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon content of the ferrosilicon.
4) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
5) After molten steel is alloyed, feeding a 1 m/ton steel silicon-calcium wire, and blowing argon for 3 minutes to machine.
EXAMPLE five
A production method of aluminum-free medium-high carbon steel is provided, wherein the mass percentage of the upper limit of the carbon content of the medium-high carbon steel is 0.85%, and the production method comprises the following steps:
1. steel-making process
1) Desulfurizing the molten iron, wherein S in the desulfurized molten iron is 0.016%;
2) the end point carbon content of the converter is 0.60 percent;
3) the converter does not add silicon deoxidizer; the clearance of the molten steel tank is 550 mm;
2. refining procedure
1) After molten steel enters an LF furnace treatment position, adding slag (4.9 kg/ton steel white ash and 2.2 kg/ton steel bauxite), and after the slag is completely melted, adding a carbon deoxidizer, wherein the adding amount of the carbon deoxidizer is x (finished carbon upper limit-carbon content in molten steel-0.03%)/carbon deoxidizer carbon content; .
2) Heating the electrode for 7 minutes, and blowing argon: 270L/min.
3) After the temperature is raised, the adding amount of the first batch of ferrosilicon is the molten steel amount multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon content of the ferrosilicon.
4) And (3) timely sticking and taking the slag sample, and when the slag sample changes color and is light green or transparent glass slag, taking the process sample and finally adjusting the components according to the process sample.
5) After molten steel is alloyed, feeding a silicon-calcium wire of 1.6 m/ton steel, and blowing argon for 3 minutes.

Claims (4)

1. The production method of the aluminum-free medium-high carbon steel is characterized in that the carbon content of the aluminum-free medium-high carbon steel is not less than 0.35% by mass, and the method comprises the following steps:
1) making steel
a, desulfurizing molten iron, wherein S in the desulfurized molten iron is less than 0.020%;
b, remaining carbon in the converter for tapping, wherein the mass percent of the carbon content at the end point is controlled according to the mass percent of more than or equal to 0.05 percent and less than or equal to-0.06 percent of the carbon upper limit of a finished product;
c, no silicon deoxidizer is added into the converter; the clearance of the molten steel tank is controlled to be 400mm-600 mm;
2) refining
a, after molten steel enters an LF furnace treatment position, firstly adding a first batch of slag material to dilute the oxidability of top slag in a molten steel tank, and then adding a carbon deoxidizer;
by controlling the oxidation of silicon in the molten steel, the use of fluorite is cancelled, and bauxite or a slagging material taking bauxite as a main component is adopted to completely replace fluorite, so that the melting temperature of top slag is lower, and the slagging of the LF furnace is not influenced;
the carbon deoxidizer is a coke carburant or a petroleum coke carburant;
b, heating the electrode, namely performing deoxidation by using the lime, a carbon deoxidizer and the high temperature of the electric arc to generate carbide slag, adding two batches of slag materials in the heating process, wherein the weight ratio of the lime to the slag melting agent in the two batches of slag materials is controlled to be 2: 1-3: 1; controlling the amount of the slag charge of the second batch to be 0-6 kg/ton steel;
c, after the temperature is raised, adding a deoxidizing agent for final deoxidation, desulfurization, taking a process sample, alloying according to the process sample, finally adjusting the components, and casting on a machine.
2. The method for producing the aluminum-free medium-high carbon steel as claimed in claim 1, wherein the slag melting agent in the step 2) is bauxite or a slag melting material with bauxite as a main component.
3. The method for producing the aluminum-free medium-high carbon steel according to claim 1, wherein the first batch of slag in the step 2) a is added with 4-5 kg of lime per ton of steel and 2-2.5 kg of slag melting agent per ton of steel; the addition amount of the carbon deoxidizer is as follows: the amount of molten steel is x (the upper limit of finished carbon-the carbon content in molten steel is-0.03%)/the carbon deoxidizer carbon content.
4. The method for producing the aluminum-free medium-high carbon steel as claimed in claim 1, wherein the deoxidizer of the step 2) c is ferrosilicon; adding the first batch of ferrosilicon after temperature rise: the molten steel amount is multiplied by (the upper limit of finished product silicon-the silicon content in the molten steel)/the silicon-iron content.
CN201910398173.6A 2019-05-14 2019-05-14 Production method of aluminum-free medium-high carbon steel Active CN110004269B (en)

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