CN110343937A - A kind of smelting process for the polar region steel controlling field trash - Google Patents

A kind of smelting process for the polar region steel controlling field trash Download PDF

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Publication number
CN110343937A
CN110343937A CN201910633355.7A CN201910633355A CN110343937A CN 110343937 A CN110343937 A CN 110343937A CN 201910633355 A CN201910633355 A CN 201910633355A CN 110343937 A CN110343937 A CN 110343937A
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steel
alloy
field trash
polar region
content
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CN201910633355.7A
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CN110343937B (en
Inventor
李明
李强
李权辉
靳星
范益
周贺贺
尹雨群
潘路影
赵柏杰
楚觉非
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to CN201910633355.7A priority Critical patent/CN110343937B/en
Publication of CN110343937A publication Critical patent/CN110343937A/en
Priority to KR1020217043397A priority patent/KR102609009B1/en
Priority to PCT/CN2020/096959 priority patent/WO2021008299A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The present invention provides a kind of smelting process of polar region steel for controlling field trash, and this method forms on the Zr-Ti composite oxides nuclear particle for the tiny distribution that solidification stages can be previously formed and grow MnS by Zr-Ti deoxidation Aldecor.Therefore, the MnS of formation is covered on tiny spherical oxide, and disperse is uniformly distributed in steel, and this arrangement enhances the toughness of steel.Meanwhile occurring the area Liao Pinmeng around MnS, the formation of acicular ferrite can be promoted, the toughness of steel is further increased by refined crystalline strengthening.In addition, a large amount of tiny, even dispersion distribution oxides, are conducive to the even tissue of steel, intensity improves.Compared with traditional Al deoxidation, the ductility and toughness of steel plate is accordingly improved, and corrosion electric current density is lower than 6mA/cm2, corrosion activity field trash reduces half, reduces the local corrosion speed of steel plate, to guarantee the service life of steel plate, meets the requirement of polar region 36kg grades of steel.

Description

A kind of smelting process for the polar region steel controlling field trash
Technical field
The invention belongs to steelmaking technical fields, and in particular to a kind of smelting process for the polar region steel for controlling field trash.
Background technique
Polar region ice breaker service condition is severe, it is desirable that steel plate has high tough, high anti-corrosion, high abrasion, the easily spies such as welding Point.Especially there is high requirement in terms of seawater corrosion resistance, this just needs extremely harsh field trash, precipitate, tissue and microcosmic The control measure such as defect and ability.Steel inclusion Dispersed precipitate breaks in ice breaker external skin and changes in the inside and surface of steel Later, become the main spot corrosion source in severe Service Environment.The key of steel grade base material and welding point seawater corrosion resistance is The control technology of corrosion activity field trash in steel.Steel plate local corrosion speed depends on corrosion activity nonmetallic inclusion in steel and contains It measures, corrosion activity field trash is lower than 2/mm in steel2The local corrosion speed that can effectively reduce steel plate, to guarantee steel plate Service life.
Summary of the invention
Goal of the invention: in order to overcome the drawbacks of the prior art, the present invention provides a kind of polar region steel of control field trash Smelting process, the smelting process can effectively control the corrosion activity field trash in steel, reduce the local corrosion speed of steel plate, To guarantee the service life of steel plate, meet the requirement of polar region 36kg grades of steel.
Technical solution: a kind of smelting process for the polar region steel controlling field trash of the present invention, the work of smelting molten steel Skill route includes KR molten iron pretreatment → BOF top and bottom combined blown converter → LF refining furnace → RH refining furnace；
Step includes:
(1) select molten iron in non-ferrous metal mass percentage content Sn≤0.010%, Pb≤0.005%, As≤ It is manufactured experimently when 0.020, Sb≤0.010, Zn≤0.010；Molten iron pretreatment guarantees that, into furnace molten iron S≤0.0020%, bits are taken off Except 90% or more；
(2) it is manufactured experimently under bottom-blowing of converter and the good situation of the working of a furnace, converter carries out multiple slag making using active lime Operation, terminal P, S are controlled below 0.008%；Free oxygen control tap in 400-600ppm, the quality hundred of aim carbon Divide and controls than content in 0.04-0.06%；
(3) converter tapping ferrosilicon and micro-carbon ferromanganese or ferrosilicon and manganese carry out preliminary deoxidation and alloying；
(4) to after LF refining furnace, [O] content of steel grade is measured and records, controlling and keeping steel oxygen content in water is 20- 60ppm；Then low aluminium Fe-Ti alloy is added and Fe-Zr alloy carries out component controlling；
(5) low aluminium Fe-Ti alloy and Fe-Zr alloy refine 3min or more after carrying out component controlling；It measures and records [O] content in steel, as there are the free oxygen of 10ppm or more, then the Si-Ca-Ba alloy that 10-20kg is added is supplemented in steel Deoxidation；
(6) de- S technological operation is then carried out, in de- S technical process, forbids adding aluminum steel；After the completion of de- S technique, according to Al line is added in target component；
(7) RH refining furnace carries out inclusion removal and degassing process, vacuum chamber oxygen blast, blowing oxygen quantity 50m3, vacuum degree≤ Retention time >=20min under the conditions of 5.0mbar；After the completion of RH degassing process, before outbound 3min, according to target component into Row Calcium treatment.
Wherein, in converter steelmaking process, the operation of pure iron water or selection is selected to meet the requirements with non-ferrous component Steel scrap is used as furnace charge.
In the step (3), when carrying out preliminary component controlling, Si matches ferrosilicon by 0.10-0.18%, and Mn is pressed 0.93-0.98% matches micro-carbon ferromanganese or manganese metal.
In the step (4), controlling and keeping steel oxygen content in water is that method used by 20-60ppm is: working as steel Oxygen content in water is greater than 60ppm, and ferrosilicon is added according to estimation and carries out deoxidation, until the oxygen content in molten steel is in 20-60ppm.
In the step (4), low aluminium Fe-Ti alloy is added and Fe-Zr alloy amounts to 10-70kg and carries out deoxidation and alloy Change.
In the step (4), low aluminium Fe-Ti alloy and Fe-Zr alloy are added together, and the additional amount of the two is according to target Ingredient and alloy content are converted, and wherein the conversion factor of Zr content is 60%.
In the step (6), in sulfur removal technology process, it is uniformly sprinkled into appropriate Al powder in the top of the slag, is diffused deoxidation； When adding Al powder, argon gas stirs mode control by quiet.
The utility model has the advantages that in the smelting process, by Zr-Ti deoxidation Aldecor, solidification stages can first shape At tiny distribution Zr-Ti composite oxides nuclear particle on formed and growth MnS.Therefore, the MnS of formation is to be covered on carefully On small spherical oxide, and disperse is uniformly distributed in steel, and such structure improves steel toughness.Meanwhile MnS is It is formed on Zr-Ti oxide, the area Liao Pinmeng around occurs, the formation of acicular ferrite can be promoted, to pass through refined crystalline strengthening Further increase the toughness of steel.In addition, a large amount of tiny, even dispersion distribution oxides, are conducive to the even tissue of steel, by force Degree improves.Compared with traditional Al deoxidation, the ductility and toughness of Zr-Ti deoxidation steel plate is accordingly improved, and corrosion current is close Degree is lower than 6mA/cm2, corrosion activity field trash reduces half, can reduce the local corrosion speed of steel plate, to guarantee steel The service life of plate meets the requirement of polar region 36kg grades of steel.
Detailed description of the invention
Fig. 1 is field trash shape appearance figure；
Fig. 2 is inclusion size distribution figure；
Fig. 3 is embodiment composition of inclusions energy spectrum analysis figure.
Specific embodiment
In the following, being done further in detail by taking a kind of special deck of boat using method of the present invention production as an example to the present invention It describes in detail bright.
The process flow for producing the special deck of boat includes KR molten iron pretreatment → BOF top and bottom combined blown converter → LF refining furnace → RH refining furnace → conticaster.
Specific steps are as follows:
(1) the non-ferrous metal Sn, Pb, As in molten iron are selected, Bi, Sb are tried when the mass percentage content of Zn is told somebody what one's real intentions are System, wherein Sn≤0.010%, Pb≤0.005%, As≤0.020, Sb≤0.010, Zn≤0.010；Molten iron pretreatment guarantees Enter furnace molten iron S≤0.0020%, bits remove 90% or more.
(2) in order to reduce the various impurity elements in raw material, select the operation of pure iron water, or selection with non-ferrous metal at The high-quality steel scrap met the requirements is divided to be used as furnace charge.It is manufactured experimently under bottom-blowing of converter and the good situation of the working of a furnace, converter uses Active lime carries out multiple slag making operation, and terminal P, S are controlled below 0.008%；Free oxygen control tap in 400- The mass percentage content of 600ppm, aim carbon are controlled in 0.04-0.06%.
(3) converter tapping ferrosilicon and micro-carbon ferromanganese or ferrosilicon and manganese carry out preliminary deoxidation and alloying；Si is pressed 0.10-0.18% matches ferrosilicon, and Mn matches micro-carbon ferromanganese or manganese metal by 0.93-0.98%.And material containing Al is not used to carry out Deoxidation and alloying.
(4) to after LF refining furnace, [O] content of steel grade is measured and recorded with quick Determining oxygen probe, controls and keeps molten steel Middle oxygen content is 20-60ppm, when steel oxygen content in water is greater than 60ppm, according to estimation addition ferrosilicon progress deoxidation, until molten steel In oxygen content in 20-60ppm.Then low aluminium Fe-Ti alloy is added and Fe-Zr alloy 10-70kg carries out deoxidation and alloy Change；Low aluminium Fe-Ti alloy and Fe-Zr alloy are added together, and the additional amount of the two is rolled over according to target component and alloy content It calculates, wherein the conversion factor of Zr content is 60%.
(5) low aluminium Fe-Ti alloy and Fe-Zr alloy refine 3min or more after carrying out component controlling；Oxygen is determined with quick Probe measures and records [O] content in steel, as there are the free oxygen of 10ppm or more, then the Si-Ca- of 10-20kg being added in steel Ba alloy carries out supplement deoxidation.
(6) de- S technological operation is then carried out, in de- S technical process, forbids adding aluminum steel, can be uniformly sprinkled into the top of the slag Appropriate Al powder, is diffused deoxidation；When adding Al powder, argon gas stirs mode control by quiet.
After the completion of de- S technique, Al line is added according to target component.
(7) RH refining furnace carries out inclusion removal and degassing process, vacuum chamber oxygen blast, blowing oxygen quantity 50m3, vacuum degree≤ Retention time >=20min under the conditions of 5.0mbar；After the completion of RH degassing process, before outbound 3min, according to target component into Row Calcium treatment.
Steel plate impact property is seen, after process improving, steel plate impact property is obviously improved, -120 degree steel plate impact >=200J, Steel plate average tensile strength 605Mpa, surplus capacity is larger, and steel plate tension requires 490-620Mpa, and tensile strength is close to the upper limit.
Fig. 1-3,1.87/mm of corrosion activity field trash in steel are combined together2, average current density 5.78mA/ cm2, the local corrosion speed of steel plate is effectively reduced, to guarantee the service life of steel plate.

Claims (7)

1. a kind of smelting process for the polar region steel for controlling field trash, which is characterized in that the process route of smelting molten steel includes KR Molten iron pretreatment → BOF top and bottom combined blown converter → LF refining furnace → RH refining furnace；
Step includes:
(1) mass percentage content Sn≤0.010% of the non-ferrous metal in molten iron is selected, Pb≤0.005%, As≤0.020, It is manufactured experimently when Sb≤0.010, Zn≤0.010；Molten iron pretreatment guarantees that, into furnace molten iron S≤0.0020%, bits remove 90% More than；
(2) it is manufactured experimently under bottom-blowing of converter and the good situation of the working of a furnace, converter carries out multiple slag making operation using active lime, Terminal P, S are controlled below 0.008%；Free oxygen control tap in 400-600ppm, the mass percent of aim carbon contains Amount control is in 0.04-0.06%；
(3) converter tapping ferrosilicon and micro-carbon ferromanganese or ferrosilicon and manganese carry out preliminary deoxidation and alloying；
(4) to after LF refining furnace, [O] content of steel grade is measured and records, controlling and keeping steel oxygen content in water is 20-60ppm； Then low aluminium Fe-Ti alloy is added and Fe-Zr alloy carries out component controlling；
(5) low aluminium Fe-Ti alloy and Fe-Zr alloy refine 3min or more after carrying out component controlling；It measures and records in steel [O] content, as there are the free oxygen of 10ppm or more, then the Si-Ca-Ba alloy that 10-20kg is added carries out supplement deoxidation in steel；
(6) de- S technological operation is then carried out, in de- S technical process, forbids adding aluminum steel；After the completion of de- S technique, according to target Al line is added in ingredient；
(7) RH refining furnace carries out inclusion removal and degassing process, vacuum chamber oxygen blast, blowing oxygen quantity 50m3, vacuum degree≤5.0mbar Under the conditions of retention time >=20min；After the completion of RH degassing process, before outbound 3min, Calcium treatment is carried out according to target component.
2. the smelting process of the polar region steel of control field trash according to claim 1, which is characterized in that in converter smelting In the process, pure iron water is selected to operate or select the steel scrap met the requirements using non-ferrous component as entering furnace charge.
3. the smelting process of the polar region steel of control field trash according to claim 1, which is characterized in that in the step (3) in, when carrying out preliminary component controlling, Si matches ferrosilicon by 0.10-0.18%, and Mn matches micro- carbon manganese by 0.93-0.98% Iron or manganese metal.
4. the smelting process of the polar region steel of control field trash according to claim 1, which is characterized in that in the step (4) in, control and keep steel oxygen content in water be 20-60ppm used by method be: when steel oxygen content in water be greater than 60ppm, Ferrosilicon is added according to estimation and carries out deoxidation, until the oxygen content in molten steel is in 20-60ppm.
5. the smelting process of the polar region steel of control field trash according to claim 4, which is characterized in that the step (4) in, low aluminium Fe-Ti alloy is added and Fe-Zr alloy amounts to 10-70kg and carries out component controlling.
6. the smelting process of the polar region steel of control field trash according to claim 5, which is characterized in that the step (4) in, low aluminium Fe-Ti alloy and Fe-Zr alloy are added together, and the additional amount of the two is carried out according to target component and alloy content Conversion, wherein the conversion factor of Zr content is 60%.
7. the smelting process of the polar region steel of control field trash according to claim 1, which is characterized in that the step (6) in, in sulfur removal technology process, it is uniformly sprinkled into appropriate Al powder in the top of the slag, is diffused deoxidation；When adding Al powder, argon gas is by quiet Stir mode control.
CN201910633355.7A 2019-07-12 2019-07-12 Smelting method of steel for polar region for controlling inclusions Active CN110343937B (en)

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CN201910633355.7A CN110343937B (en) 2019-07-12 2019-07-12 Smelting method of steel for polar region for controlling inclusions
KR1020217043397A KR102609009B1 (en) 2019-07-12 2020-06-19 Polar steel smelting method to control inclusions
PCT/CN2020/096959 WO2021008299A1 (en) 2019-07-12 2020-06-19 Polar steel smelting process controlling inclusions

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CN111455257A (en) * 2020-04-29 2020-07-28 南京钢铁股份有限公司 Control method of steel inclusion for railway bogie
CN111519094A (en) * 2020-04-29 2020-08-11 南京钢铁股份有限公司 Steel for railway bogie and preparation method thereof
CN115011863A (en) * 2022-07-12 2022-09-06 攀钢集团攀枝花钢铁研究院有限公司 Control method for A-type inclusions of rail steel
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