CN115449700A - Method for improving low-carbon gear steel strip-shaped structure based on oxide metallurgy and low-carbon gear steel - Google Patents
Method for improving low-carbon gear steel strip-shaped structure based on oxide metallurgy and low-carbon gear steel Download PDFInfo
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- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a method for improving a low-carbon gear steel strip structure based on oxide metallurgy and low carbonThe method for improving the banded structure of the low-carbon gear steel based on oxide metallurgy comprises the following processes: modification and regulation of impurities in the smelting process: adding an inclusion modifier when LF is discharged, modifying and modifying to obtain a product with the size of 0.5-3.0 μm and the number density of 80-200/mm 2 Dispersed oxide of (a); controlling rolling and cooling in the rolling process: after heating and heat preservation, the continuous casting billet is respectively rolled and deformed at 1100-1130 ℃ and 920-960 ℃, and then is cooled to room temperature at the speed of 1.0-3.0 ℃/s. The invention obtains the oxide capable of inducing the nucleation of the ferrite in the crystal through the modification and modification treatment in the refining process, controls rolling and cooling in the rolling process, plays the metallurgical role of the oxide of inclusions, promotes the nucleation and growth of the ferrite in the crystal in the cooling process, refines the crystal grains, and effectively inhibits the formation of the ferrite in the grain boundary so as to achieve the aim of improving the banded structure.
Description
Technical Field
The invention belongs to the field of steel smelting production, and particularly relates to a method for improving a low-carbon gear steel strip structure based on oxide metallurgy and low-carbon gear steel.
Background
The low-carbon gear steel is one of key materials with higher use requirements in engineering machinery such as automobiles, railways and the like, and is a manufacturing material of a core component for ensuring safety. The banded structure is a common harmful structure in low-carbon gear steel, generally refers to a ferrite/pearlite band formed under the condition of hot rolling and slow cooling, and the existence of the banded structure can not only deteriorate the transverse toughness and plasticity of steel and cause anisotropy of mechanical properties of the steel, but also influence the heat treatment deformation uniformity of subsequently processed parts, and can cause the scrapping of the gear processed parts in serious cases. Therefore, the banded structure is a harmful structure which is urgently expected to be avoided in the current low-carbon gear steel production process.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for improving the banded structure of low-carbon gear steel based on oxide metallurgy and the low-carbon gear steel.
The technical scheme adopted by the invention is as follows:
a method for improving a low-carbon gear steel band-shaped structure based on oxide metallurgy comprises the following steps:
modification and control of impurities in the smelting process, continuous casting and rolling and cooling control in the rolling process;
wherein, the modification and control of the inclusions in the smelting process are to add an inclusion modifier when LF refining is out of the station, and the inclusion modifier adopts Re-based modifier, zr-Ti-based modifier or Mg-based modifier to modify and deteriorate to obtain dispersed oxides;
when controlled rolling and controlled cooling are carried out in the rolling process, heating the continuous casting billet to 1000-1250 ℃, and preserving heat for 2-3 h; then cooling to 1100-1130 ℃ to carry out first-stage rolling, wherein the rolling deformation of the first-stage rolling is 30-40%, and the deformation rate is 0.1-1.0/s; then cooling to 920-960 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 30-50%, and the deformation rate is 0.01-0.1/s; after the second stage of rolling deformation, cooling to room temperature, wherein the cooling rate is controlled to be 1.0-3.0 ℃/s.
Preferably, when the inclusion modifier is a Re-based modifier, the Re content of the Re-based modifier is 15 to 30 percent and the addition amount of the Re-based modifier is 1.0 to 2.0kg/t in percentage by mass.
Preferably, when the inclusion modifier is a Zr-Ti-based modifier, the Zr content in the Zr-Ti-based modifier is 30 to 50 percent, the Ti content is 15 to 20 percent and the addition amount of the Zr-Ti-based modifier is 0.5 to 2.0kg/t in percentage by mass.
Preferably, when the inclusion modifier is Mg-based modifier, the Mg content in the Mg-based modifier is 10-20% by mass percent, and the addition amount of the Mg-based modifier is 1.0-3.0 kg/t.
Preferably, the size of the dispersed oxide is 0.5-3.0 mu m, and the number density of the dispersed oxide is 80-200/mm 2 。
Preferably, the rolling temperature drop of the first stage is controlled to be 70-100 ℃, the rolling temperature drop of the second stage is controlled to be 40-60 ℃, and the temperature of the casting blank is not less than 860 ℃ after the rolling deformation of the second stage.
The invention also provides the low-carbon gear steel which is processed by the method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy.
Preferably, the low-carbon gear steel comprises the following components in percentage by mass: 0.18 to 0.22 percent of C, 0.20 to 0.33 percent of Si, 0.75 to 0.85 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 0.45 to 0.55 percent of Cr, 0.55 to 0.68 percent of Ni, 0.2 to 0.3 percent of Mo, 0.010 to 0.015 percent of Al, less than or equal to 0.0020 percent of T.O, 0.0020 to 0.0035 percent of N, and the balance of Fe.
The invention has the following beneficial effects:
according to the invention, the oxides capable of inducing fine dispersion distribution of the intragranular ferrite are obtained through the inclusion modification treatment in the refining process, the metallurgical effect of the oxides of the inclusions is exerted through controlled rolling and controlled cooling in the rolling process, the nucleation and growth of the intragranular ferrite in the cooling process are promoted, the crystal grains are refined, the formation of the ferrite at the grain boundary is effectively inhibited, the in-situ control of the banded structure is realized in the hot rolling and cooling process, and the formation of the banded structure is effectively avoided.
Drawings
FIG. 1 is a microstructure diagram of a low carbon gear steel rolled by a traditional smelting process;
FIG. 2 is a microstructure of a low carbon gear steel after rolling according to the working process of example 1 of the present invention;
FIG. 3 is a microstructure of a low carbon gear steel after rolling by the processing technique of example 2 of the present invention;
FIG. 4 is a microstructure of a low carbon gear steel after rolling by the processing technique of example 3 of the present invention.
FIG. 5 is a microstructure of a low carbon gear steel after rolling according to the working process of example 4 of the present invention.
FIG. 6 is a microstructure of a low carbon gear steel after rolling according to the processing method of example 5 of the present invention.
FIG. 7 is a microstructure of a low carbon gear steel after rolling by the process of example 6 of the present invention.
FIG. 8 is a microstructure of a low carbon gear steel after rolling according to the working process of example 7 of the present invention.
FIG. 9 is a microstructure of a low carbon gear steel after rolling by the process of example 8 of the present invention.
FIG. 10 is a microstructure of a low carbon gear steel after rolling according to the working process of example 9 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the inclusion modification control is to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxide, wherein the size of the fine dispersed oxide is 0.5-3.0 mu m, and the number density of the oxide is 80-200/mm 2 (ii) a The inclusion modifier is one of Re base, zr-Ti base and Mg base; when the inclusion modifier adopts Re-based modifier, the Re content in the Re-based modifier is 15-30 percent by mass percent, and the addition amount of the Re-based modifier is 1.0-2.0 kg/t. When the inclusion modifier is a Zr-Ti-based modifier, the Zr content in the Zr-Ti-based modifier is 30-50 percent, the Ti content is 15-20 percent and the addition amount of the Zr-Ti-based modifier is 0.5-2.0 kg/t by mass percent. When the inclusion modifier is Mg-based modifier, the Mg content in the Mg-based modifier is 10-20% by mass percent, and the addition amount of the Mg-based modifier is 1.0-3.0 kg/t.
The rolling process is controlled by rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 2-3 h at 1200-1250 ℃ by a heating furnace, then is cooled to 1100-1130 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 30-40%, the deformation rate is 0.1-1.0/s, and the rolling temperature drop of the first stage is controlled at 70-100 ℃; then cooling to 920-960 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 30-50%, the deformation rate is 0.01-0.1/s, and the rolling temperature drop of the second-stage rolling is controlled at 40-60 ℃; after the second stage of rolling deformation, the temperature of the casting blank is not less than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 1.0-3.0 ℃/s.
The invention obtains the oxide capable of inducing the nucleation of the ferrite in the crystal through the modification and modification treatment in the refining process, controls rolling and cooling in the rolling process, plays the metallurgical role of the oxide of inclusions, promotes the nucleation and growth of the ferrite in the crystal in the cooling process, refines the crystal grains, and effectively inhibits the formation of the ferrite in the grain boundary so as to achieve the aim of improving the banded structure.
The method is suitable for processing the low-carbon gear steel, and the low-carbon gear steel comprises the following main chemical components in percentage by mass: 0.18 to 0.22 percent of C, 0.20 to 0.33 percent of Si, 0.75 to 0.85 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 0.45 to 0.55 percent of Cr, 0.55 to 0.68 percent of Ni, 0.2 to 0.3 percent of Mo, 0.010 to 0.015 percent of Al, less than or equal to 0.0020 percent of T.O, 0.0020 to 0.0035 percent of N, and the balance of Fe.
Example 1
The low-carbon gear steel comprises the following components in percentage by mass:
c:0.18%, si:0.33%, mn:0.65%, P:0.01%, S:0.007%, cr:0.55%, ni:0.59%, mo:0.25%, al:0.015%, T.O:0.0016%, N:0.0027 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the inclusion modification and regulation is to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 80/mm 2 (ii) a The inclusion modifier is Re-base, the Re content in the Re-base modifier is 15 percent by mass percent, and the addition amount of the Re-base modifier is 2.0kg/t。
The rolling process is controlled by rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 3 hours at 1200 ℃ through a heating furnace, then is cooled to 1100 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 30%, the deformation rate is 0.1/s, and the rolling temperature drop of the first stage is controlled at 70 ℃; then cooling to 920 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 50%, the deformation rate is 0.1/s, and the rolling temperature drop of the second stage is controlled at 40 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 1.0 ℃/s.
Example 2
The low-carbon gear steel comprises the following components in percentage by mass:
c:0.18%, si:0.33%, mn:0.65%, P:0.01%, S:0.007%, cr:0.55%, ni:0.59%, mo:0.25%, al:0.015%, T.O:0.0016%, N:0.0027 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and control of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 200/mm 2 (ii) a The inclusion modifier is Re base, the Re content in the Re base modifier is 30 percent by mass percent, and the addition amount of the Re base modifier is 1.0kg/t.
The rolling process is controlled rolling and cooling, the smelted and continuously cast continuous casting billet is subjected to heat preservation for 3 hours at 1200 ℃ through a heating furnace, then is cooled to 1100 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 30%, the deformation rate is 0.1/s, and the rolling temperature drop of the first stage is controlled at 70 ℃; then cooling to 920 ℃ for second stage rolling, wherein the rolling deformation of the second stage rolling is 50%, the deformation rate is 0.1/s, and the rolling temperature drop of the second stage is controlled at 40 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 1.0 ℃/s.
Example 3
The low-carbon gear steel comprises the following components in percentage by mass:
c:0.18%, si:0.33%, mn:0.65%, P:0.01%, S:0.007%, cr:0.55%, ni:0.59%, mo:0.25%, al:0.015%, T.O:0.0016%, N:0.0027 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and regulation of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 140/mm 2 (ii) a The inclusion modifier is Re base, the Re content in the Re base modifier is 24 percent, and the addition amount of the Re base modifier is 1.5kg/t.
The rolling process is controlled by rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 3 hours at 1200 ℃ through a heating furnace, then is cooled to 1100 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 30%, the deformation rate is 0.1/s, and the rolling temperature drop of the first stage is controlled at 70 ℃; then cooling to 920 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 50%, the deformation rate is 0.1/s, and the rolling temperature drop of the second stage is controlled at 40 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 1.0 ℃/s.
Example 4
The low-carbon gear steel comprises the following components in percentage by mass: c:0.20%, si:0.20%, mn:0.75%, P:0.008%, S:0.005%, cr:0.45%, ni:0.68%, mo:0.3%, al:0.013%, t.o:0.0018%, N:0.0035 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and control of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 80/mm 2 (ii) a The inclusion modifier is Zr-Ti based, and in mass percent, the Zr content in the Zr-Ti based modifier is 30 percent, the Ti content in the Zr-Ti based modifier is 20 percent, and the addition amount of the Zr-Ti based modifier is 0.5kg/t.
The rolling process is controlled rolling and cooling, the smelted and continuously cast continuous casting billet is subjected to heat preservation for 2 hours at 1250 ℃ through a heating furnace, then is cooled to 1130 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 40%, the deformation rate is 1/s, and the rolling temperature drop of the first stage is controlled at 100 ℃; then cooling to 960 ℃ for second stage rolling, wherein the rolling deformation of the second stage rolling is 30%, the deformation rate is 0.01/s, and the rolling temperature drop of the second stage is controlled at 60 ℃; after the second stage rolling deformation, the temperature of the casting blank is more than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 3 ℃/s.
Example 5
The low-carbon gear steel comprises the following components in percentage by mass: c:0.20%, si:0.20%, mn:0.75%, P:0.008%, S:0.005%, cr:0.45%, ni:0.68%, mo:0.3%, al:0.013%, t.o:0.0018%, N:0.0035 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and control of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 140/mm 2 (ii) a The inclusion modifier is Zr-Ti base and is calculated by mass percentThe Zr content in the Zr-Ti-based modifier is 50 percent, the Ti content is 15 percent, and the adding amount of the Zr-Ti-based modifier is 2.0kg/t.
The rolling process is controlled by rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 2 hours at 1250 ℃ by a heating furnace, then is cooled to 1130 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 40%, the deformation rate is 1/s, and the rolling temperature drop of the first stage is controlled at 100 ℃; then cooling to 960 ℃ for second stage rolling, wherein the rolling deformation of the second stage rolling is 30%, the deformation rate is 0.01/s, and the rolling temperature drop of the second stage is controlled at 60 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 3 ℃/s.
Example 6
The low-carbon gear steel comprises the following components in percentage by mass: c:0.20%, si:0.20%, mn:0.75%, P:0.008%, S:0.005%, cr:0.45%, ni:0.68%, mo:0.3%, al:0.013%, t.o:0.0018%, N:0.0035 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and control of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 200/mm 2 (ii) a The inclusion modifier is Zr-Ti based, and the mass percent of the inclusion modifier is that the Zr content in the Zr-Ti based modifier is 40 percent, the Ti content in the Zr-Ti based modifier is 17 percent, and the adding amount of the Zr-Ti based modifier is 1.2kg/t.
The rolling process is controlled by rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 2 hours at 1250 ℃ by a heating furnace, then is cooled to 1130 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 40%, the deformation rate is 1/s, and the rolling temperature drop of the first stage is controlled at 100 ℃; then cooling to 960 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 30%, the deformation rate is 0.01/s, and the rolling temperature drop of the second stage is controlled at 60 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 3 ℃/s.
Example 7
The low-carbon gear steel comprises the following components in percentage by mass: c:0.22%, si:0.26%, mn:0.85%, P:0.009%, S:0.01%, cr:0.52%, ni:0.55%, mo:0.2%, al:0.01%, T.O:0.0019%, N:0.0020 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and control of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 80/mm 2 (ii) a The inclusion modifier is Mg-based, and the Mg content in the Mg-based modifier is 10% by mass percent, and the addition amount of the Mg-based modifier is 1.0kg/t.
The rolling process is controlled rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 2.5 hours at 1225 ℃ through a heating furnace, then is cooled to 1115 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 35%, the deformation rate is 0.5/s, and the rolling temperature drop of the first stage is controlled at 85 ℃; then cooling to 940 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 40%, the deformation rate is 0.05/s, and the rolling temperature drop of the second-stage rolling is controlled at 50 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 2 ℃/s.
Example 8
The low-carbon gear steel comprises the following components in percentage by mass: c:0.22%, si:0.26%, mn:0.85%, P:0.009%, S:0.01%, cr:0.52%, ni:0.55%, mo:0.2%, al:0.01%, T.O:0.0019%, N:0.0020 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and regulation of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 140/mm 2 (ii) a The inclusion modifier is Mg-based, and the Mg content in the Mg-based modifier is 20% by mass percent, and the addition amount of the Mg-based modifier is 3.0kg/t.
The rolling process is controlled rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 2.5 hours at 1225 ℃ through a heating furnace, then is cooled to 1115 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 35%, the deformation rate is 0.5/s, and the rolling temperature drop of the first stage is controlled at 85 ℃; then cooling to 940 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 40%, the deformation rate is 0.05/s, and the rolling temperature drop of the second-stage rolling is controlled at 50 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 2 ℃/s.
Example 9
The low-carbon gear steel comprises the following components in percentage by mass: c:0.22%, si:0.26%, mn:0.85%, P:0.009%, S:0.01%, cr:0.52%, ni:0.55%, mo:0.2%, al:0.01%, T.O:0.0019%, N:0.0020 percent and the balance of Fe.
The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy comprises the following steps of:
modifying and controlling impurities in the smelting process, and controlling rolling and cooling in the rolling process;
the modification and control of the inclusions are to add an inclusion modifier when LF refining is out of the station, modify and modify to obtain fine dispersed oxides, wherein the size of the fine dispersed oxides is 0.5-3.0 mu m, and the number density of the oxides is 200/mm 2 (ii) a The inclusion modifier is Mg baseThe Mg content of the Mg-based modifier is 15 percent by mass, and the addition amount of the Mg-based modifier is 2kg/t.
The rolling process is controlled by rolling and cooling, the smelted and continuously cast continuous casting slab is subjected to heat preservation for 2.5 hours at 1225 ℃ by a heating furnace, then is cooled to 1115 ℃ for first-stage rolling, the rolling deformation of the first-stage rolling is 35%, the deformation rate is 0.5/s, and the rolling temperature drop of the first stage is controlled at 85 ℃; then cooling to 940 ℃ for second-stage rolling, wherein the rolling deformation of the second-stage rolling is 40%, the deformation rate is 0.05/s, and the rolling temperature drop of the second-stage rolling is controlled at 50 ℃; after the second stage of rolling deformation, the temperature of the casting blank is higher than 860 ℃, and then the casting blank is cooled to room temperature, wherein the cooling rate is controlled to be 2 ℃/s.
FIG. 1 is a microstructure diagram of a low-carbon gear steel rolled by a conventional smelting process, and FIGS. 2 to 10 are microstructure diagrams of a low-carbon gear steel rolled by a smelting process according to examples 1 to 9 of the present invention; obviously, the low-carbon gear steel strip-shaped structure rolled by the smelting process is improved, and the steel does not have an obvious strip-shaped structure and is replaced by uniformly distributed ferrite and pearlite structures.
The technical idea of the present invention is described in the above technical solutions, and the protection scope of the present invention is not limited thereto, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention belong to the protection scope of the technical solutions of the present invention.
Claims (8)
1. A method for improving a low-carbon gear steel band-shaped structure based on oxide metallurgy is characterized by comprising the following steps:
modification and control of impurities in the smelting process, continuous casting and rolling and cooling control in the rolling process;
wherein, the modification and control of the inclusions in the smelting process are to add an inclusion modifier when LF refining is out of the station, and the inclusion modifier adopts Re-based modifier, zr-Ti-based modifier or Mg-based modifier to modify and deteriorate to obtain dispersed oxides;
when controlled rolling and controlled cooling are carried out in the rolling process, heating the continuous casting billet to 1200-1250 ℃, and preserving heat for 2-3 h; then cooling to 1100-1130 ℃ to carry out first-stage rolling, wherein the rolling deformation of the first-stage rolling is 30% -40%, and the deformation rate is 0.1-1.0/s; then cooling to 920-960 ℃ for second stage rolling, wherein the rolling deformation of the second stage rolling is 30-50%, and the deformation rate is 0.01-0.1/s; after the second stage of rolling deformation, cooling to room temperature, wherein the cooling rate is controlled to be 1.0-3.0 ℃/s.
2. The method for improving the ribbon structure of the low carbon gear steel based on the oxide metallurgy is characterized in that when the Re-based modifier is adopted as the inclusion modifier, the Re content in the Re-based modifier is 15-30% by mass percent, and the addition amount of the Re-based modifier is 1.0-2.0 kg/t.
3. The method for improving the banded structure of low carbon gear steel based on oxide metallurgy according to claim 1, wherein when the Zr-Ti based modifier is used as the inclusion modifier, the Zr content in the Zr-Ti based modifier is 30 to 50 percent, the Ti content in the Zr-Ti based modifier is 15 to 20 percent, and the Zr-Ti based modifier is added in an amount of 0.5 to 2.0kg/t in percentage by mass.
4. The method for improving the banded structure of the low carbon gear steel based on the oxide metallurgy is characterized in that when the inclusion modifier is a Mg-based modifier, the Mg content of the Mg-based modifier is 10 to 20 percent by mass percent, and the addition amount of the Mg-based modifier is 1.0 to 3.0kg/t.
5. The method for improving the banded structure of low carbon gear steel based on oxide metallurgy according to claim 1, wherein the size of the dispersed oxide is 0.5-3.0 microns, and the number density of the dispersed oxide is 80-200/mm 2 。
6. The method for improving the banded structure of the low-carbon gear steel based on the oxide metallurgy is characterized in that the rolling temperature drop of the first stage is controlled to be 70-100 ℃, the rolling temperature drop of the second stage is controlled to be 40-60 ℃, and the temperature of a casting blank is not less than 860 ℃ after the rolling deformation of the second stage.
7. A low carbon gear steel according to claim 1, wherein the low carbon gear steel is processed by the method for improving the banded structure of low carbon gear steel based on oxide metallurgy according to any one of claims 1 to 6.
8. The low carbon gear steel of claim 1, wherein the low carbon gear steel comprises, in mass percent: 0.18 to 0.22 percent of C, 0.20 to 0.33 percent of Si, 0.75 to 0.85 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 0.45 to 0.55 percent of Cr, 0.55 to 0.68 percent of Ni, 0.2 to 0.3 percent of Mo, 0.010 to 0.015 percent of Al, less than or equal to 0.0020 percent of T.O, 0.0020 to 0.0035 percent of N, and the balance of Fe.
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