CN113481429A - High-strength bluing bundled steel with tensile strength greater than 980MPa and manufacturing method thereof - Google Patents

High-strength bluing bundled steel with tensile strength greater than 980MPa and manufacturing method thereof Download PDF

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Publication number
CN113481429A
CN113481429A CN202110646603.9A CN202110646603A CN113481429A CN 113481429 A CN113481429 A CN 113481429A CN 202110646603 A CN202110646603 A CN 202110646603A CN 113481429 A CN113481429 A CN 113481429A
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steel
strength
bluing
rolling
equal
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汤亨强
汪建威
俞波
杨平
王占业
李进
吴浩
裴东扬
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Maanshan Iron and Steel Co Ltd
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Maanshan Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236Cold rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium

Abstract

The invention discloses high-strength bluing bundled strip steel with tensile strength of more than 980MPa and a manufacturing method thereof, and relates to the technical field of bundled strip steel. The bundling strip steel comprises the following main chemical components in percentage by weight: c: 0.18-0.23%, Si is less than or equal to 0.03%, Mn: 0.60-0.90%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, B: 0.003-0.005%, Alt: 0.020-0.050%, N less than or equal to 0.004%, and the balance of Fe and inevitable impurities; then the high-strength binding belt with the tensile strength of more than 980MPa and the elongation of more than 10 percent is produced through the working procedures of hot rolling, four-frame full six-roller cold continuous rolling, tempering, bluing and the like; the induction heater is used for heating the steel coil before rolling so as to improve the rolling reduction rate of acid and improve the strength of the binding belt raw material; the oil content in the emulsion is reduced to be within 6 percent, so that open fire in a subsequent tempering furnace is avoided.

Description

High-strength bluing bundled steel with tensile strength greater than 980MPa and manufacturing method thereof
Technical Field
The invention relates to the technical field of strapping steel, in particular to high-strength bluing strapping steel with tensile strength of more than 980MPa and a manufacturing method thereof.
Background
Steel strapping is often referred to as a strapping steel used for industrial product packaging, and is currently mainly used for packaging finished or semi-finished products such as steel, nonferrous metals, cotton, wool and the like, wherein the steel is the most applied industry. Therefore, the binding band must have the characteristics of high strength, good toughness, firmness and the like, is not easy to be unpacked in the transportation, loading and unloading processes, and may encounter severe environment in the outdoor transportation and storage processes, so that the binding band must also have certain corrosion resistance. At present, the 980 MPa-grade binding belt is mainly used for high-strength steel products, the annual demand exceeds 10 ten thousand tons, and the proportion of high-strength steel is continuously improved along with the continuous development of the steel industry in China, so that the steel for the high-strength binding belt has wide market prospect.
Through searching, if the application number is: 201210232927.9, application date is: 7/6/2012, and the application publication date is: a chinese patent, 10 months and 10 days 2012, discloses a method for producing a high-strength bluing binder, which comprises the following chemical components in percentage by weight: c: 0.15 to 0.25%, Mn: 1.5-2.2%, Si: less than or equal to 0.05 percent, P: less than or equal to 0.025 percent, S: less than or equal to 0.02 percent, Als: 0.01 to 0.08 percent. The raw material of the high-strength tensile strapping tape is obtained by adopting 9-10 times of reduction, although the process is simple and the pollution is small, the content of Mn element in the steel is high, and the production cost is higher and the economical efficiency is poor by adopting push-pull type acid washing and multi-time rolling. If the application number is as follows: 201510302169.7, filing date: the application publication date is that the product is shown in 2015 at 6 and 5 days: 2017, Chinese patent 1, month and 4, discloses binding strip steel for cold-rolled coils with tensile strength of 980MPa and a manufacturing method thereof, wherein the binding strip steel comprises the following chemical components in percentage by weight: c: 0.30-0.38%, Si: 0.15-0.30%, Mn: 0.55-0.75%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, and Cr: 0.10-0.20%, Alt: 0.01-0.04%, and the balance Fe. The steel grade has high C element content, is not beneficial to welding, has high Si element content, is easy to fall off after bluing, and has poor corrosion resistance. For another example, the application numbers are: 201810394049.8, filing date: 27 th 4 month in 2018, and application publication date is: chinese patent of 2018, 9 and 25, discloses a hot-rolled strip steel for TKDC (TKDC) bundling and a production method thereof, wherein the hot-rolled strip steel comprises the following chemical components in percentage by weight: c: 0.18 to 0.20%, Mn: 1.20-1.30%, S is less than or equal to 0.015%, P is less than or equal to 0.025%, Si: 0.1-0.20%, Als is more than or equal to 0.025%, Ti: 0.015-0.025 percent of the total weight of the alloy, less than or equal to 0.0050 percent of N, and the balance of iron and inevitable impurities. The steel grade adopts a four-section type cooling method to obtain the steel material for the high-strength binding belt, has extremely high requirement on the precision of equipment, has high control difficulty in the large-scale production process, has high Si element content, and is not beneficial to the later bluing treatment.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the defects of the prior art, the invention provides high-strength bluing bundled strip steel with tensile strength of more than 980MPa and a manufacturing method thereof, which are used for producing the high-strength banding with tensile strength of more than 980MPa and elongation of more than 10 percent by accurately controlling components in the steel and through the working procedures of hot rolling, four-frame full six-roller cold continuous rolling, tempering bluing and the like.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a high-strength bluing bundle strip steel with tensile strength of more than 980MPa level comprises the following main chemical components in percentage by weight: c: 0.18-0.23%, Si is less than or equal to 0.03%, Mn: 0.60-0.90%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, B: 0.003-0.005%, Alt: 0.020-0.050%, N less than or equal to 0.004%, and the balance of Fe and inevitable impurities. The tensile property of the binding belt can be effectively improved by improving the element C, and the control C is as follows: 0.17% -0.23% to avoid the elongation of the binding band from gradually decreasing along with the increase of the content of C, and in addition, the influence on the weldability of the binding band can be effectively reduced; the content of Si element in steel is reduced to obtain better bluing effect; the Mn content is controlled to be 0.60-0.90 percent so as to improve the hardenability of the binding belt in the cooling process, ensure better plastic toughness and ensure the welding seam performance; al is used as a main deoxidizer, and meanwhile, aluminum also has a certain effect on grain refinement, and the range of the aluminum is controlled to be 0.020-0.050% so as to effectively avoid the influence on the hot working performance, the welding performance and the cutting processing performance of the steel; the trace B element can effectively improve the hardenability of the strapping steel and effectively improve the strength of the strapping steel, and the B element is controlled to be 0.003-0.005 percent to prevent the strength of the steel from being reduced; the N element is easy to react with B in the steel, so that the effect of improving the hardenability of the B element is weakened, and therefore, the content of N is controlled within the range of less than or equal to 0.004 percent.
A manufacturing method of high-strength bluing bundled steel strip with tensile strength more than 980MPa is characterized by comprising the following steps:
step one, smelting: adopting a front slag skimming procedure and a rear slag skimming procedure in the molten iron pretreatment process, and adjusting the content of S element to reduce harmful elements in molten steel;
step two, continuous casting: the control target of the tundish temperature is 15-30 ℃ above the liquidus temperature;
step three, hot continuous rolling: the heating temperature is controlled to be 1210-1250 ℃, so that the steel billet is fully austenitized, and the compound is fully dissolved; the finishing temperature is controlled to be 860-890 ℃ so as to ensure that the finishing temperature is controlled to be above austenite, avoid the phenomenon of mixed crystals caused by rolling in a two-phase region and obtain fine grain structures;
step four, controlling cooling: cooling the steel coil to 560-600 ℃ at a cooling speed of more than 35 ℃/s by controlling the flow rate of cooling water so as to obtain a bainite structure with excellent tensile property, and also reducing the tendency of crystal grains to grow at high temperature so as to obtain a fine structure;
step five, cold rolling: four-stand full six-roller cold continuous rolling is adopted, the total rolling reduction rate of the cold rolling is controlled to be 60% -75%, compared with a traditional five-stand rolling mill, the four-stand rolling mill has fewer stands, and the rolling cost can be reduced; the large reduction ratio can improve the distortion energy of crystal grains in the steel and reduce the recrystallization temperature so as to improve the tensile strength of the binding belt;
step six, tempering and bluing: and (3) dividing the steel coil into strips, and then carrying out tempering and bluing treatment, wherein the tempering temperature is controlled to be 480-580 ℃ and the tempering time is 60-180 s, and the temperature and the time can ensure that the plastic toughness of the steel strip is improved to a certain extent and a bluing coating with excellent corrosion resistance is obtained.
According to the further technical scheme, in the fifth step, heating before rolling is adopted, and before the steel coil enters the rolling mill, the steel coil raw material is heated to 70-80 ℃ by using the induction heater so as to effectively improve the biting capability of the rolling mill and reduce the strength of the steel coil in the rolling process, so that a higher acid rolling reduction rate is obtained, and the strength of the bundling belt raw material is further improved.
In the fifth step, the oil content in the emulsion is reduced to be within 6% in the rolling process so as to reduce the oil content on the surface of the steel strip; and the reduction of production safety factor caused by open fire in a subsequent tempering furnace and the fluctuation of the temperature of the plate surface and the performance caused by the fluctuation can be avoided.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention relates to a high-strength bluing bundled steel strip with tensile strength of more than 980MPa and a manufacturing method thereof, which precisely controls C in the steel: 0.18-0.23%, Si is less than or equal to 0.03%, Mn: 0.60-0.90%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, B: 0.003-0.005%, Alt: 0.020-0.050 percent of the total weight of the steel, less than or equal to 0.004 percent of the total weight of N, and the balance of Fe, inevitable impurities and other components, and the high-strength binding band with the tensile strength of more than 980MPa and the elongation of more than 10 percent is produced through the working procedures of hot rolling, four-stand full six-roller cold continuous rolling, tempering, bluing and the like;
(2) according to the high-strength bluing bundled strip steel with the tensile strength of more than 980MPa and the manufacturing method thereof, the heating temperature is controlled to be 1210-1250 ℃ during hot continuous rolling, so that the steel billet is fully austenitized, and the compound is fully dissolved; the finishing temperature is controlled to be 860-890 ℃ so as to ensure that the finishing temperature is controlled to be above austenite, avoid the phenomenon of mixed crystals caused by rolling in a two-phase region and obtain fine grain structures;
(3) according to the high-strength bluing bundled steel strip with the tensile strength of more than 980MPa and the manufacturing method thereof, during cooling, the steel coil is cooled to 560-600 ℃ at the cooling speed of more than 35 ℃/s by controlling the flow rate of cooling water so as to obtain a bainite structure with excellent tensile property, and the tendency of crystal grains to grow at high temperature can be reduced so as to obtain a fine structure;
(4) according to the high-strength bluing bundle strip steel with the tensile strength of more than 980MPa and the manufacturing method thereof, the four-stand full six-roller cold continuous rolling is adopted, the total rolling reduction rate of the cold rolling is controlled to be 60-75%, the number of stands is small compared with that of a traditional five-stand rolling mill, and the rolling cost can be reduced; the large reduction ratio can improve the distortion energy of crystal grains in the steel and reduce the recrystallization temperature so as to improve the tensile strength of the binding belt;
(5) according to the high-strength bluing bundled steel strip with the tensile strength of more than 980MPa and the manufacturing method thereof, the steel coil is subjected to tempering and bluing after being stripped, the tempering temperature is controlled to be 480-580 ℃, the time is 60-180 s, the temperature and the time can ensure that the plastic toughness of the steel strip is improved to a certain extent, and a bluing coating with excellent corrosion resistance is obtained;
(6) according to the high-strength bluing bundled steel strip with the tensile strength higher than 980MPa and the manufacturing method thereof, before a steel coil enters a rolling mill, heating before rolling is adopted, and the steel coil raw material is heated to 70-80 ℃ by using an induction heater, so that the biting capability of the rolling mill is effectively improved, the strength of the steel coil in the rolling process is reduced, a higher acid rolling reduction rate is obtained, and the strength of the bundled steel strip raw material is further improved;
(7) according to the high-strength bluing bundle strip steel with the tensile strength of more than 980MPa and the manufacturing method thereof, the oil content in the emulsion is reduced to be within 6% in the rolling process so as to reduce the oil content on the surface of the strip steel; and the reduction of production safety factor caused by open fire in a subsequent tempering furnace and the fluctuation of the temperature of the plate surface and the performance caused by the fluctuation can be avoided.
Detailed Description
For a further understanding of the present invention, the following detailed description is provided.
Example 1
The high-strength bluing bundled strip steel with the tensile strength higher than 980MPa and the high-strength bluing bundled strip steel with the tensile strength higher than 980MPa in the embodiment have the following main chemical components in percentage by weight: c: 0.18-0.23%, Si is less than or equal to 0.03%, Mn: 0.60-0.90%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, B: 0.003-0.005%, Alt: 0.020-0.050%, N less than or equal to 0.004%, and the balance of Fe and inevitable impurities.
The function of the alloy elements of the steel grade in the invention is mainly based on the following principle:
1) carbon (C): as the most economical reinforcing element, the tensile strength of the band can be effectively improved by increasing the C element, but the elongation of the band gradually decreases as the C element increases, and the influence on the weldability of the band is extremely significant, so that the C: 0.17% -0.23%;
2) silicon (Si): si is also a common strengthening element, but when the content of Si is too high, the iron scale on the surface of the steel plate is not easy to remove, and the later bluing treatment is influenced, so that the corrosion resistance is poor, therefore, the content of Si in the steel is less than or equal to 0.030 percent, and a better bluing effect is obtained by reducing the content of Si in the steel;
3) manganese (Mn): mn, as a strengthening element, not only effectively improves the strength of the strap, but also improves the hardenability of the strap during cooling. In addition, Mn can also reduce the austenite → ferrite phase transition temperature, enlarge the hot working temperature range and is beneficial to refining the ferrite grain size; but the Mn content is too high, which is unfavorable for plasticity and toughness and has certain influence on welding seam performance, and the Mn control range is 0.60-0.90 percent by comprehensive consideration;
4) phosphorus (P): the diffusion speed of P in gamma-Fe and alpha-Fe is low, segregation is easy to form, and the welding performance of the steel plate is not good, so that the content of P is reduced as much as possible in the steelmaking process, and the P is ensured to be less than or equal to 0.018%;
5) sulfur (S): the S element is a harmful element in the battery case steel, so that the steel generates hot brittleness, the ductility and the toughness of the steel are reduced, and cracks are easily caused during rolling. Further, S is also disadvantageous in welding performance and lowers corrosion resistance. Therefore, the content of S in the steel is controlled to be less than or equal to 0.012 percent as much as possible;
6) aluminum (Al): al is used as a main deoxidizer, and meanwhile, aluminum also has a certain effect on grain refinement. The defect of aluminum is that the hot working performance, the welding performance and the cutting processing performance of steel are influenced, and the content of Al is controlled within the range of 0.020-0.050 percent;
7) boron (B): the trace B element can effectively improve the hardenability of the strapping steel and the strength of the strapping steel, but when the B element exceeds 0.005 percent, the strength of the steel is reduced, so the B element in the steel is controlled to be 0.003 to 0.005 percent;
8) nitrogen (N): the N element is easy to react with B in the steel, so that the effect of improving the hardenability of the B element is weakened. Therefore, the invention controls the N content in the range of [ N ] less than or equal to 0.004%.
Example 2
The basic structure of the manufacturing method of the high-strength bluing bundled steel strip with the tensile strength of more than 980MPa is the same as that of the embodiment 1, and the difference and the improvement are that the manufacturing method comprises the following steps:
step one, smelting: adopting a front slag skimming procedure and a rear slag skimming procedure in the molten iron pretreatment process, and adjusting the content of S element to reduce harmful elements in molten steel;
step two, continuous casting: the control target of the tundish temperature is 15-30 ℃ above the liquidus temperature;
step three, hot continuous rolling: the heating temperature is controlled to be 1210-1250 ℃, so that the steel billet is fully austenitized, and the compound is fully dissolved; the finishing temperature is controlled to be 860-890 ℃ so as to ensure that the finishing temperature is controlled to be above austenite, avoid the phenomenon of mixed crystals caused by rolling in a two-phase region and obtain fine grain structures;
step four, controlling cooling: cooling the steel coil to 560-600 ℃ at a cooling speed of more than 35 ℃/s by controlling the flow rate of cooling water so as to obtain a bainite structure with excellent tensile property, and also reducing the tendency of crystal grains to grow at high temperature so as to obtain a fine structure;
step five, cold rolling: four-stand full six-roller cold continuous rolling is adopted, the total rolling reduction rate of the cold rolling is controlled to be 60% -75%, compared with a traditional five-stand rolling mill, the four-stand rolling mill has fewer stands, and the rolling cost can be reduced; the large reduction ratio can improve the distortion energy of crystal grains in the steel and reduce the recrystallization temperature so as to improve the tensile strength of the binding belt;
step six, tempering and bluing: and (3) dividing the steel coil into strips, and then carrying out tempering and bluing treatment, wherein the tempering temperature is controlled to be 480-580 ℃ and the tempering time is 60-180 s, and the temperature and the time can ensure that the plastic toughness of the steel strip is improved to a certain extent and a bluing coating with excellent corrosion resistance is obtained.
In the fifth embodiment, in the rolling process, the oil content in the emulsion is reduced to be less than 6% so as to reduce the oil content on the surface of the steel strip; and the reduction of production safety factor caused by open fire in a subsequent tempering furnace and the fluctuation of the temperature of the plate surface and the performance caused by the fluctuation can be avoided.
Further, in the fifth step, heating before rolling is adopted, and before the steel coil enters the rolling mill, the steel coil raw material is heated to 70-80 ℃ by using the induction heater so as to effectively improve the biting capacity of the rolling mill and reduce the strength of the steel coil in the rolling process, so that higher acid rolling reduction rate is obtained, and the strength of the bundling belt raw material is further improved.
In this example, the chemical components of molten steel are shown in table 1, and the balance is Fe and inevitable impurity elements.
TABLE 1 chemical composition, wt.%
Figure RE-GDA0003216681860000051
All production processes were trial-processed as in table 2, and the hot rolled coils of examples 1, 2, 3 and comparative example 1 were rolled to 3.0mm, and the thickness specification of the finished product was 0.9 mm. Since the comparative example does not adopt the induction heating process, the rolling from 3.0mm to 0.9mm can be carried out after the single-stand rolling mill repeatedly rolls for 9 times. And the comparative example has a higher bluing bubble rate and a poorer effect than the examples after bluing.
TABLE 2 production Process
Figure RE-GDA0003216681860000061
The mechanical property values of the final product are shown in Table 3, the strength of the example can reach 980MPa, and the elongation is more than 10%, but the elongation of the comparative example is obviously lower than that of the example although the strength of the comparative example reaches 980 MPa.
TABLE 3 mechanical Properties
Figure RE-GDA0003216681860000062
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (4)

1. The utility model provides a tensile strength is greater than 980MPa level high strength bluing bundle belted steel which characterized in that: the main chemical components of the binding band by weight percentage are as follows: c: 0.18-0.23%, Si is less than or equal to 0.03%, Mn: 0.60-0.90%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, B: 0.003-0.005%, Alt: 0.020-0.050%, N less than or equal to 0.004%, and the balance of Fe and inevitable impurities.
2. A manufacturing method of high-strength bluing bundled steel strip with tensile strength more than 980MPa is characterized by comprising the following steps:
step one, smelting: adopting a front slag skimming procedure and a rear slag skimming procedure in the molten iron pretreatment process, and adjusting the content of an S element;
step two, continuous casting: the control target of the tundish temperature is 15-30 ℃ above the liquidus temperature;
step three, hot continuous rolling: the heating temperature is controlled to be 1210-1250 ℃, and the finishing temperature is controlled to be 860-890 ℃;
step four, controlling cooling: cooling the steel coil to 560-600 ℃ at a cooling speed of more than 35 ℃/s by controlling the flow rate of cooling water;
step five, cold rolling: four-frame full six-roller cold continuous rolling is adopted, and the total cold rolling reduction is controlled to be 60-75%;
step six, tempering and bluing: and (3) dividing the steel coil into strips, and then carrying out tempering and bluing treatment, wherein the tempering temperature is controlled to be 480-580 ℃ and the tempering time is 60-180 seconds.
3. The manufacturing method of the high-strength bluing bundle strip steel with the tensile strength of more than 980MPa level according to claim 2, characterized in that: and fifthly, heating before rolling, and heating the steel coil raw material to 70-80 ℃ by using an induction heater before the steel coil enters a rolling mill.
4. The manufacturing method of the high-strength bluing bundle strip steel with the tensile strength of more than 980MPa level according to claim 2, characterized in that: and step five, reducing the oil content in the emulsion to be within 6% in the rolling process.
CN202110646603.9A 2021-06-10 2021-06-10 High-strength bluing bundled steel with tensile strength greater than 980MPa and manufacturing method thereof Pending CN113481429A (en)

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