CN115433882A - High-tensile-strength low-density cold-rolled thin steel strip based on sub-rapid solidification and rolling process and manufacturing method thereof - Google Patents
High-tensile-strength low-density cold-rolled thin steel strip based on sub-rapid solidification and rolling process and manufacturing method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D2211/001—Austenite
Abstract
The invention discloses a high tensile strength low density cold rolling thin steel strip based on a sub-rapid solidification and rolling process and a manufacturing method thereof, wherein the low density cold rolling thin steel strip comprises the following chemical components in percentage by mass: c: 0.6-1.5%, mn 16-25%, al:6% -12%, V is 0.01% -0.2%, zr: 0.01-0.5%, si 0.01-0.5%, cu:0.01% -2%, ni:0.05 to 2 percent, and the balance of Fe and impurity elements. According to the manufacturing method, complex processes such as slab heating, multi-pass repeated hot rolling and the like are omitted in the hot rolling stage, the production flow is shorter, the process cost is low, and the energy consumption and carbon emission of production are greatly reduced; the low-density cold-rolled thin steel strip manufactured by the method has the yield strength of more than 1550MPa, the tensile strength of more than 1800MPa and the elongation of more than 10 percent.
Description
Technical Field
The invention belongs to the technical field of steel production, and particularly relates to a high-tensile-strength low-density cold-rolled thin steel strip based on a sub-rapid solidification and rolling process and a manufacturing method thereof.
Background
Compared with the traditional common high-strength steel, the advanced high-strength steel has the greatest advantages of ensuring the mechanical property, reducing the thickness and weight of the plate construction, having good formability, anti-collision concavity, anti-fatigue property and higher work hardening rate, and showing good application prospects in various industries. Fe-Mn-C-Al series low-density steel appeared in the last century, and with the progress of research, the particularity of the low-density steel was gradually excavated. First, the density of the steel grade is lower than that of other steel grades, and studies have shown that the density of the steel can be reduced by 1.3% for every 1% increase in Al, and the fault energy can be significantly increased by 9-11 mJ/m for every 1wt% increase in Al 2 . The work hardening mechanism of the low-density steel is not limited to the transformation induced plasticity and twin crystal induced plasticity strengthening, micro-strip induced plasticity and shear band induction of the high-manganese steelThe plastic and dynamic slip band refining and other work hardening mechanisms can also be used for strengthening low-density steel, and meanwhile, the dispersion distribution of the nano-scale second phase kappa' carbide can pin and refine crystal grains, and the comprehensive mechanical properties of the steel can be further strengthened through microalloying of Nb, V and Ti, such as yield strength, tensile strength, elongation after fracture and the like. In view of the above characteristics, low density steel is widely used in the fields of automobile and ship manufacturing industries, and energy consumption and exhaust emission can be reduced by reducing weight.
Heretofore, a balance of three major indexes of "lightweight, strength, toughness" of a metal material has been sought. However, strength and toughness are always mutually exclusive, and it is difficult to obtain high strength while ensuring good plasticity, so that a low-density steel plate having high strength while ensuring high plasticity is demanded. At present, the research on Fe-Mn-C-Al series low-density, high-strength and high-plasticity steel is mainly prepared by the traditional production processes of hot rolling, annealing after hot rolling, pickling, cold rolling and annealing after cold rolling, and the method has the disadvantages of complex process, higher energy consumption and environmental pollution, higher cost and higher development difficulty.
The prior patent document CN111235484B discloses a preparation method of high-strength high-hardness low-density steel, which is characterized in that the alloy steel comprises the following chemical components in percentage by weight: 0.7-1.8%, mn 25-34%, al 8-12%, si 0.3-0.9%, cr 0.3-1.2%, V:0.1-0.7 percent of Ti, 0.1-0.8 percent of Ti and 0.7-1.3 percent of Mo, and the tensile strength can reach 950-1127MPa and the hardness can reach 62-68HRC after hot forging, water toughening, hot rolling and solution treatment and cold rolling and aging treatment. Patent document CN104711494A discloses a high-strength high-plasticity NiAl-strengthened low-density steel, which is characterized in that the alloy steel comprises the following chemical components in percentage by weight: 0.5-1.5%, mn 10-30%, al 5-12%, ni:5-15%, tensile strength of above 1350MPa, and elongation of above 10%. Patent document CN108779528B discloses an austenitic steel strip with high ductility, low density and high strength, characterized in that the chemical composition of the alloy steel is C:0.65-0.9%, mn 5.0-20%, al 5.5-11%, si more than 0 and less than or equal to 0.15%, cu more than 0 and less than or equal to 0.34%, cr more than 0 and less than or equal to 00.14 percent of the steel, and simultaneously adding one or more than one microalloy elements of V, ti, nb, V, zr and the like, wherein the tensile strength of the steel is more than or equal to 800MPa, the elongation is more than or equal to 25 percent, and the density is less than or equal to 7.3kg/m 3 。
The manufacturing methods of the steel products disclosed in the patent documents all adopt the traditional continuous rolling process, the process flow is long, the energy consumption is high, the number of units and equipment is large, the capital construction cost is high, the comprehensive production cost is high, and due to the high alloy elements, segregation is easy to generate in the casting process, the rolling force in the rolling process is large, cracks are easy to form in both hot rolling and cold rolling, the development difficulty is large, and the development difficulty for thin steel strips with high tensile strength and high elongation is larger.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a low-density cold-rolled thin steel strip with high tensile strength based on a sub-rapid solidification and rolling process and a manufacturing method thereof, the manufacturing method omits the complicated processes of heating a plate blank, repeatedly hot rolling multiple times and the like in the hot rolling stage, only carries out cold rolling after the sub-rapid solidification and the hot rolling with 20-50% of reduction of a single time, has shorter production flow, low process cost and greatly reduced energy consumption and carbon emission of production; in the casting stage, because the thickness of the cast strip is thin and the solidification speed is high, no obvious central P segregation strip and strip-shaped MnS inclusion strip exist in the thin strip steel, the high toughness is shown, and the subsequent cold deformation processing is facilitated; the low-density cold-rolled thin steel strip manufactured by the method has the yield strength of more than 1550MPa, the tensile strength of more than 1800MPa and the elongation of more than 10 percent.
In order to achieve the purpose, the technical scheme of the invention is to design a low-density cold-rolled thin steel strip with high tensile strength based on a sub-rapid solidification and rolling process, which comprises the following chemical components in percentage by mass: c: 0.6-1.5%, mn 16-25%, al:6% -12%, V is 0.01% -0.2%, zr: 0.01-0.5%, si 0.01-0.5%, cu:0.01% -2%, ni:0.05 to 2 percent of the total weight of the alloy, and the balance of Fe and impurity elements.
The preferable technical proposal is that the chemical components and the mass percentage of the impurity elements meet P less than or equal to 0.06 percent, S less than or equal to 0.002 percent and N less than or equal to 0.003 percent.
Correspondingly, the invention also discloses a manufacturing method of the high-tensile-strength low-density cold-rolled thin steel strip based on the sub-rapid solidification and rolling process, which comprises the following steps:
s1: smelting according to the chemical components and the mass percentage to prepare molten steel;
s2: the molten steel prepared in the step S1 is subjected to sub-rapid solidification to prepare a casting belt;
s3: carrying out one-time hot rolling on the cast strip prepared in the step S2 to prepare a thin steel strip;
s4: cooling the thin steel strip prepared in the step S3 to 600-800 ℃ by an aerosol cooling system;
s5: carrying out solution treatment on the thin steel strip prepared in the step S4 at the temperature of 900-1150 ℃ for 1-3 h, then carrying out cold rolling with the reduction of 20-50%, carrying out aging treatment at the temperature of 650-850 ℃ for 10-12 h, and then carrying out air cooling;
wherein the low-density cold-rolled thin steel strip produced by the production method has a yield strength of 1550MPa or more and a tensile strength of 1800MPa or more.
The preferable technical scheme is that in the step S2, the specific operations are as follows: and (3) solidifying the molten steel prepared in the step (S1) into a casting belt by a single-rod melt rotation method, wherein the thickness of the casting belt is 1.4-2.5 mm.
In a preferable technical scheme, in the step S3, the one-pass hot rolling reduction is 20 to 50%, the thickness of the thin steel strip is 0.8 to 1.9mm, and the width of the thin steel strip is 60 to 150mm in the step S3.
In a preferable technical scheme, in the step S3, the hot rolling outlet temperature is 850-1050 ℃.
Further preferably, the low-density cold-rolled thin steel strip manufactured by the above manufacturing method has a metallographic structure of austenite and a precipitated phase, a thickness of 0.5 to 1.0mm, an elongation of 10% or more, and a density of 6.5 to 7.2g/cm 3 。
The invention has the advantages and beneficial effects that:
1. the process of developing the low-density steel by using the traditional production process is complex and has great difficulty, the manufacturing method of the invention can reduce the production difficulty of the low-density steel by producing the hot rolled steel strip through the sub-rapid solidification and one-pass hot rolling process and then cold rolling, and related production process reports are not seen before.
2. The hot rolling stage in the manufacturing method of the invention omits the complex processes of slab heating, multi-pass repeated hot rolling and the like, and only carries out cold rolling after the sub-rapid solidification and the single-pass hot rolling with 20-50% of reduction, thus having shorter production flow, low process cost and greatly reduced energy consumption and carbon emission of production.
3. In the casting stage of the low-density cold-rolled thin steel strip, as the cast strip is thin and the solidification speed is high, no obvious central P segregation strip and long MnS inclusion strip exist in the thin steel strip, the low-density cold-rolled thin steel strip has high toughness and is beneficial to the subsequent cold deformation processing.
4. In the traditional hot rolling process, alloying elements are precipitated in the slab cooling process, and the utilization rate of the alloying elements is reduced because the re-dissolution of the alloying elements is insufficient when the slab is reheated; in the sub-rapid solidification process of the manufacturing method, the cast strip is directly hot-rolled, and the added alloy elements mainly exist in a solid solution state, so that the alloy utilization rate can be improved.
5. The low-density cold-rolled thin steel strip has a metallographic structure of austenite and a precipitated phase, and has excellent high tensile property: the yield strength is more than 1550MPa, the tensile strength is more than 1800MPa, and the elongation is more than 10%.
Detailed Description
The following examples are provided to further illustrate embodiments of the present invention. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The method for manufacturing the high-tensile-strength low-density cold-rolled thin steel strip based on the sub-rapid solidification and rolling process comprises the following steps of:
s1: the material comprises the following chemical components in percentage by mass: c:1.1%, mn:21%, al:9.8%, V:0.15%, si 0.5%, ni:1.5%, zr:0.15%, cu:1.5%, P:0.06%, S:0.002%, N:0.003 percent of the total weight of the molten steel, and the balance of Fe and inevitable impurity elements, and smelting to prepare molten steel with qualified components;
s2: casting the molten steel qualified in the step S1 into a casting belt with the thickness of 1.9mm by a single-rod melt rotation method, wherein the temperature of the molten steel is about 1500 ℃;
s3: the casting strip prepared in the step S2 is subjected to one-time hot rolling, the pressing amount is 40%, and a thin steel strip is prepared, wherein the temperature of the thin steel strip after hot rolling is 950 ℃;
s4: carrying out aerial fog cooling on the thin steel strip prepared in the step S3 to 730 ℃;
s5: carrying out solution treatment on the thin steel strip prepared in the step S4 at the temperature of 1000 ℃ for 1.5h, then carrying out cold rolling with the reduction of 40%, carrying out aging treatment at the temperature of 650 ℃ for 10h, and then carrying out air cooling;
the low-density cold-rolled thin steel strip manufactured by the manufacturing method has the width of 60mm, the thickness of 0.75mm and the density of 6.8g/cm 3 The yield strength is 1570MPa, the tensile strength is 1800MPa, and the elongation is 16%.
Example 2
The method for manufacturing the low-density cold-rolled thin steel strip with high tensile strength based on the sub-rapid solidification and rolling process comprises the following steps:
s1: the material comprises the following chemical components in percentage by mass: c:1.2%, mn:22%, al:10.2%, V:0.15%, zr:0.15%, cu:1.5%, si 0.3%, ni:1.5%, P:0.06%, S:0.002%, N:0.003 percent of the total weight of the molten steel, and the balance of Fe and inevitable impurity elements, and smelting and preparing the molten steel with qualified components;
s2: casting the qualified molten steel smelted in the step S1 into a casting belt with the thickness of 1.9mm by a single-rod melt rotation method, wherein the temperature of the molten steel is about 1540 ℃;
s3: preparing the casting belt prepared in the step S2 into a thin steel belt by performing one-time hot rolling with the pressing amount of 40%, wherein the temperature of the thin steel belt after hot rolling is 1000 ℃;
s4: carrying out aerial fog cooling on the thin steel strip prepared in the step S3 to 710 ℃;
s5: carrying out solution treatment on the thin steel strip prepared in the step S4 at 1050 ℃ for 2h, then carrying out cold rolling with the reduction of 40%, carrying out aging treatment at 750 ℃ for 11h, and then carrying out air cooling;
the low-density cold-rolled thin steel strip manufactured by the manufacturing method has the width of 80mm, the thickness of 0.70mm and the density of 6.8g/cm 3 The yield strength is 1590MPa, the tensile strength is 1827MPa, and the elongation is 16%.
Example 3
The method for manufacturing the high-tensile-strength low-density cold-rolled thin steel strip based on the sub-rapid solidification and rolling process comprises the following steps of:
s1: the material comprises the following chemical components in percentage by mass: c:1.2%, mn:22%, al:10.2%, V:0.15%, si 0.5%, ni:2.0%, zr:0.15%, cu:1.5%, P:0.06%, S:0.002%, N:0.003 percent of the total weight of the molten steel, and the balance of Fe and inevitable impurity elements, and smelting to prepare molten steel with qualified components;
s2: casting the molten steel qualified in the step S1 into a casting strip with the thickness of 1.9mm by a single-rod melt rotation method, wherein the casting and rolling speed is 85m/min, and the temperature of the molten steel is about 1555 ℃;
s3: preparing the cast strip prepared in the step S2 into a thin steel strip by performing one-time hot rolling with the pressing amount of 45%, wherein the temperature of the thin steel strip after hot rolling is 870 ℃;
s4: cooling the thin steel strip prepared in the step S3 to 860 ℃ through aerial fog;
s5: carrying out solution treatment on the thin steel strip prepared in the step S4 at 1050 ℃ for 2.0h, then carrying out cold rolling with the reduction of 40%, carrying out aging treatment at 700 ℃ for 11h, and then carrying out air cooling;
the low-density cold-rolled thin steel strip manufactured by the manufacturing method has the width of 70mm, the thickness of 0.65mm and the density of 6.8g/cm 3 The yield strength was 1610MPa, the tensile strength was 1842MPa, and the elongation was 15%.
Example 4
The method for manufacturing the low-density cold-rolled thin steel strip with high tensile strength based on the sub-rapid solidification and rolling process comprises the following steps:
s1: the material comprises the following chemical components in percentage by mass: c:1.2%, mn:22%, al:10.2%, V:0.15%, si 0.5%, ni:2.0%, zr:0.15%, cu:1.5%, P:0.06%, S:0.002%, N:0.003 percent of the total weight of the molten steel, and the balance of Fe and inevitable impurity elements, and smelting and preparing the molten steel with qualified components;
s2: casting the molten steel qualified in the step S1 into a casting strip with the thickness of 1.9mm by a single-rod melt rotation method, wherein the casting and rolling speed is 75m/min, and the temperature of the molten steel is about 1550 ℃;
s3: the cast strip prepared in the step S2 is subjected to one-time hot rolling, the pressing amount of the cast strip is 45 percent, and the temperature of the thin steel strip after hot rolling is 950 ℃;
s4: carrying out aerial fog cooling on the thin steel strip prepared in the step S3 to 750 ℃;
s5: carrying out solution treatment on the thin steel strip prepared in the step S4 at the temperature of 1100 ℃ for 2.0h, then carrying out cold rolling with the reduction of 45%, carrying out aging treatment at the temperature of 700 ℃ for 11h, and then carrying out air cooling;
the low-density cold-rolled thin steel strip manufactured by the manufacturing method has the width of 60mm, the thickness of 0.60mm and the density of 6.8g/cm 3 The yield strength was 1620MPa, the tensile strength was 1860MPa, and the elongation was 15%.
Example 5
The method for manufacturing the high-tensile-strength low-density cold-rolled thin steel strip based on the sub-rapid solidification and rolling process comprises the following steps of:
s1: the material comprises the following chemical components in percentage by mass: c:1.0%, mn:21%, al:10.5%, V:0.2%, si 0.5%, ni:1.5%, zr:0.20%, cu:1.5%, P:0.06%, S:0.002%, N:0.003 percent of the total weight of the molten steel, and the balance of Fe and inevitable impurity elements, and smelting and preparing the molten steel with qualified components;
s2: casting the molten steel qualified in the step S1 into a casting belt with the thickness of 1.9mm by a single-rod melt rotation method, wherein the casting and rolling speed is 75m/min, and the temperature of the molten steel is about 1500 ℃;
s3: preparing the casting belt prepared in the step S2 into a thin steel belt through one-time hot rolling with the pressing amount of 45%, wherein the temperature of the thin steel belt after hot rolling is 950 ℃;
s4: carrying out aerial fog cooling on the thin steel strip prepared in the step S3 to 730 ℃;
s5: carrying out solution treatment on the thin steel strip prepared in the step S4 at the temperature of 1100 ℃ for 3.0h, then carrying out cold rolling with the reduction of 50%, carrying out aging treatment at the temperature of 800 ℃ for 10h, and then carrying out air cooling;
the low-density cold-rolled thin steel strip manufactured by the manufacturing method has the width of 80mm, the thickness of 0.55mm and the density of 6.8g/cm 3 The yield strength is 1650MPa, the tensile strength is 1878MPa, and the elongation is 14%.
The metallographic structures of the low-density cold-rolled thin steel strips prepared in test examples 1 to 5 were all austenite and precipitated phases.
According to the manufacturing method, complex processes such as slab heating, multi-pass repeated hot rolling and the like are omitted in the hot rolling stage, cold rolling is carried out only after sub-rapid solidification and single-pass 20-50% reduction hot rolling, the production flow is shorter, the process cost is low, and the energy consumption and carbon emission of production are greatly reduced; in the casting stage, because the thickness of the cast strip is thin and the solidification speed is high, no obvious central P segregation strip and strip-shaped MnS inclusion strip exist in the thin strip steel, the high toughness is shown, and the subsequent cold deformation processing is facilitated; the low-density cold-rolled thin steel strip manufactured by the method has the yield strength of more than 1550MPa, the tensile strength of more than 1800MPa and the elongation of more than 10 percent.
The effects of each element in the high-strength, high-plasticity and low-density steel are as follows:
c: the C element mainly forms kappa '-carbide with Mn and Al elements to form precipitation strengthening and dispersion strengthening and improve the strength of steel, and the C is an austenite forming element and can promote the formation of austenite and reduce the density of the steel at the same time, but the excessive content of the C can form excessive kappa' -carbide and adversely affect the elongation of the alloy.
Mn is an austenite forming element and can promote the formation of austenite, the strong plasticity of steel is very favorable, mn can form kappa' -carbide with C and Al, the strong plasticity of steel is further improved through precipitation strengthening and dispersion strengthening, the density of Mn is slightly lower than that of Fe, the density of steel cannot be increased, and meanwhile, mn is cheaper, but excessive addition of Mn can cause the steel to precipitate a large amount of beta-Mn phases in the aging process, and the phases are hard phases and can greatly reduce the plasticity of steel, so that the content of Mn is controlled within a range, and the content of the Mn-based steel is 16-25%.
Al element can greatly reduce the density of steel, and can form kappa' -carbide with C and Mn elements, and the strong plasticity of the steel is further improved through precipitation strengthening and dispersion strengthening effects, but the cost of the steel is increased due to the excessively high Al content, so that the Al content is controlled within a range, and the content of the invention is 6-12%.
V element effectively improves the strength and toughness of steel by forming carbonitride in the steel grade, more V element can be dissolved under the condition of sub-rapid solidification, better precipitation in the later period is facilitated, and the precipitation strengthening effect is better played, the cost is increased by adding V, and cracks are generated on a steel strip by precipitating V on a grain boundary, so that the concentration of V is controlled to be 0.01-0.2%.
Zr element can remove N element in steel and inhibit AlN from forming. Under the condition of sub-rapid solidification, zr can better play a role in refining grains. However, zr is relatively expensive and increases the cost of steel. Therefore, the content of Zr element is controlled between 0.01 percent and 0.5 percent.
Si, si can be deoxidized, the specific gravity of the steel can be reduced by the Si, more Si can be dissolved under the condition of sub-rapid solidification, the effect of solid solution strengthening is better achieved, the strength of the steel is improved, but the welding performance of the steel is reduced due to the fact that the content of Si is too high, and therefore the maximum content of Si is allowed to be 0.5%.
Cu can stabilize austenite, and Cu is cheaper than Ni, so that more Cu can be dissolved in the solution under the condition of sub-rapid solidification, the segregation of Cu is reduced, the cracking tendency is reduced, and the effect of solid solution strengthening is better achieved, but if the Cu content is too high, the cost is increased, and the cracking is easier in the rolling process, so the Cu concentration must be within 0.01-2%.
Ni can stabilize austenite and improve stacking fault energy, ni can improve corrosion resistance and oxidation resistance of steel by concentrating on the surface of the steel, can inhibit H absorption in a corrosion process, can dissolve more Ni elements under a sub-rapid solidification condition, and better achieves the effect of solid solution strengthening. Therefore, the addition content of Ni is within 0.05% -2%.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (7)
1. A low-density cold-rolled thin steel strip with high tensile strength based on a sub-rapid solidification and rolling process is characterized by comprising the following chemical components in percentage by mass: c: 0.6-1.5%, mn 16-25%, al: 6-12%, V0.01-0.2%, zr: 0.01-0.5%, si 0.01-0.5%, cu:0.01% -2%, ni:0.05 to 2 percent, and the balance of Fe and impurity elements.
2. The thin, low-density, cold-rolled steel strip with high tensile strength based on the sub-rapid solidification + rolling process according to claim 1, characterized in that the chemical composition and mass percentage of the impurity elements satisfy P.ltoreq.0.06%, S.ltoreq.0.002%, N.ltoreq.0.003%.
3. A method of manufacturing a high tensile strength low density cold rolled thin steel strip according to claim 1 or 2 based on a sub rapid solidification + rolling process comprising the steps of:
s1: smelting to prepare molten steel according to the chemical components and the mass percent of the alloy steel in the claim 1 or 2;
s2: the molten steel prepared in the step S1 is subjected to sub-rapid solidification to prepare a casting belt;
s3: carrying out one-time hot rolling on the cast strip prepared in the step S2 to prepare a thin steel strip;
s4: cooling the thin steel strip prepared in the step S3 to 600-800 ℃ by an aerosol cooling system;
s5: carrying out solution treatment on the thin steel strip prepared in the step S4 at the temperature of 900-1150 ℃ for 1-3 h, then carrying out cold rolling with the reduction of 20-50%, carrying out aging treatment at the temperature of 650-850 ℃ for 10-12 h, and then carrying out air cooling;
wherein the low-density cold-rolled thin steel strip produced by the production method has a yield strength of 1550MPa or more and a tensile strength of 1800MPa or more.
4. The method for manufacturing a high tensile strength low density cold rolled thin steel strip according to claim 3, wherein the step S2 comprises the following steps: and (3) solidifying the molten steel prepared in the step (S1) into a casting belt by a single-rod melt rotation method, wherein the thickness of the casting belt is 1.4-2.5 mm.
5. The method for manufacturing a low-density cold-rolled thin steel strip with high tensile strength according to the sub rapid solidification + rolling process of claim 3, wherein the hot rolling reduction in one pass in step S3 is 20% to 50%, the thin steel strip has a thickness of 0.8 to 1.9mm and a width of 60mm to 150mm.
6. The method for manufacturing a high tensile strength, low density, cold rolled thin steel strip according to claim 3 wherein the hot rolling finishing temperature in step S3 is 850 ℃ to 1050 ℃.
7. The method for manufacturing a low-density cold-rolled thin steel strip having a high tensile strength according to any one of claims 3 to 6, which is manufactured by the sub-rapid solidification + rolling process, wherein the low-density cold-rolled thin steel strip has a metallographic structure of austenite and a precipitated phase, a thickness of 0.5 to 1.0mm, an elongation of 10% or more, and a density of 6.5 to 7.2g/cm 3 。
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