CN115595498A - Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate and preparation method thereof - Google Patents
Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 157
- 239000010959 steel Substances 0.000 title claims abstract description 157
- 239000002131 composite material Substances 0.000 title claims abstract description 76
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims description 81
- 238000001816 cooling Methods 0.000 claims description 56
- 238000010438 heat treatment Methods 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 45
- 238000010521 absorption reaction Methods 0.000 claims description 28
- 238000003723 Smelting Methods 0.000 claims description 25
- 229910000859 α-Fe Inorganic materials 0.000 claims description 20
- 229910000742 Microalloyed steel Inorganic materials 0.000 claims description 18
- 238000005098 hot rolling Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000004321 preservation Methods 0.000 claims description 12
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- PMTRSEDNJGMXLN-UHFFFAOYSA-N titanium zirconium Chemical compound [Ti].[Zr] PMTRSEDNJGMXLN-UHFFFAOYSA-N 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 238000005496 tempering Methods 0.000 description 9
- 238000010791 quenching Methods 0.000 description 8
- 230000000171 quenching effect Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000008602 contraction Effects 0.000 description 6
- 238000011031 large-scale manufacturing process Methods 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009865 steel metallurgy Methods 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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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
- 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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- 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
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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
- C22C38/12—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
- C22C—ALLOYS
- 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
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Abstract
The invention discloses a Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate and a preparation method thereof, belonging to the technical field of high-strength and high-toughness steel plates. The steel plate comprises the following chemical components in percentage by mass: c:0.02-0.05wt.%, si:0.20-0.30wt.%, mn:1.40-1.80wt.%, P.ltoreq.0.008 wt.%, S.ltoreq.0.008 wt.%, ti:0.08-0.20wt.%, mo:0.05-0.15wt.%, zr:0.01-0.07wt.%, the balance being Fe and unavoidable impurities. The steel plate disclosed by the invention has high strength, high toughness and low yield ratio, and is suitable for the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles and the like.
Description
Technical Field
The invention belongs to the technical field of high-strength and high-toughness steel plates, and relates to a Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate and a preparation method thereof.
Background
In the prior art, high-strength and high-toughness steel plates are generally obtained by accurately controlling the content of chemical elements in steel and by a high-cleanness steel metallurgy technology, a heat treatment strengthening technology, a low-cost high-performance microalloying technology, a controlled rolling and controlled cooling technology and the like.
The technology for accurately controlling the content of chemical elements in steel and the high-cleanness steel metallurgy technology obviously has high cost, large operation difficulty and complex process, and is not beneficial to industrial large-scale production and popularization.
The traditional high-strength and high-toughness steel plate is produced by a quenching and tempering heat treatment process (quenching and high-temperature tempering), and although the steel has good strength and toughness, the yield ratio of the steel is very high (> 0.96), so that the steel is not beneficial to application in certain fields.
In order to reduce the yield ratio of steel, quenching, two-phase zone secondary quenching and tempering processes are mostly adopted at present, but for high-toughness medium plates, the growth of crystal grains is promoted by prolonging the heating time, so that the performance of the steel is reduced. The additional quenching and tempering heat treatment also increases the manufacturing process and increases the manufacturing cost. Particularly, the hot rolled steel plate with the yield strength of 800MPa is required to be subjected to microalloying of Nb, ti, cu, ni, mo, B and the like, tempering treatment is required, and the relaxation time is required to be regulated and controlled in the prior art.
Although the low-cost high-performance microalloying technology and the controlled rolling and controlled cooling technology can respectively realize the grain refinement of the steel plate, the strength and the toughness cannot be well matched, and then the high-strength high-toughness steel plate can be obtained by matched heat treatment, so that the preparation process is complex and the cost is high.
For example: chinese patent CN 113046635A discloses a high-toughness corrosion-resistant steel for ocean engineering and a manufacturing method thereof, wherein microalloying elements comprise Cr, mo, ni, V and B, the obtained material needs to be subjected to a forging process and a heat treatment process, the performance can reach 800MPa, but the preparation process is complex, the cost is high, the operation difficulty is high, and the high-toughness corrosion-resistant steel is not beneficial to industrial large-scale production.
Chinese patent CN105603322A discloses a steel plate with ultra-low cost 800MPa grade high toughness and excellent weldability and a manufacturing method thereof, wherein microalloying elements comprise Cr, mo, nb, ni, V, ti, B, al and Ca, the microalloying elements comprise more alloying elements and higher cost, the obtained material needs to be tempered by a heat treatment process, the heat energy consumption and the cost are increased, the grain growth probability is increased, the 800MPa grade refers to tensile strength which is not equal to a hot-rolled steel plate without heat treatment with high strength of 800MPa grade, the yield strength is lower than 800MPa, and the elongation is lower although the low-temperature impact toughness is very high.
Chinese patent CN103131956A discloses a high strength and toughness steel plate with tensile strength of more than 800MPa and a manufacturing method thereof, wherein microalloying elements comprise Cr, mo, V, ti, al and B, more alloying elements are selected, the cost is higher, a heat treatment process of quenching and tempering is adopted to carry out heat treatment on a rolled steel plate, more heat energy is consumed, crystal grains grow up, the tensile strength of the rolled steel plate is more than or equal to 800MPa, the yield ratio is less than or equal to 0.92, and the yield strength of the rolled steel plate is not more than 800MPa although the low-temperature impact toughness is also high.
In summary, the 800MPa class hot rolled steel plate in the prior art needs to be tempered after hot rolling to improve tensile strength, yield strength and elongation, and obviously, if the tempering is not performed, the yield strength of the hot rolled steel plate cannot reach 800MPa class, so additional heat treatment is needed, and the production cost is increased; and other hot rolled steel plates need additional microalloying elements, so the preparation process is complex, the cost is high, the operation difficulty is high, and the industrial large-scale production and popularization are not facilitated.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, an 800MPa hot rolled steel plate needs an additional heat treatment process to correspondingly adjust a hot rolled tissue structure, so that the production cost is increased, and the operation difficulty is high; the cost of selecting the element components is high; the yield strength of the hot rolled steel plate with the thickness of 3-20mm without the heat treatment process is less than 800MPa, the low-temperature impact toughness is not matched with the yield strength, the tensile strength and the elongation, the production efficiency is low, and the method is not suitable for industrial production.
In order to solve the technical problems, the invention provides the following technical scheme:
a Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate comprises the following chemical components in percentage by mass: c:0.02-0.05wt.%, si:0.20-0.30wt.%, mn:1.40-1.80wt.%, P.ltoreq.0.008 wt.%, S.ltoreq.0.008 wt.%, ti:0.08-0.15wt.%, mo:0.05-0.15wt.%, zr:0.01-0.03wt.%, the balance being Fe and unavoidable impurities; wherein, ti: zr is 1.14:1-20:1, ti: mo is 0.53:1-4:1, zr: mo is 0.07:1-1.4:1, ti + Zr + Mo:0.14-0.42wt.%.
Preferably, the steel sheet has a structure of polygonal ferrite and acicular ferrite, the ratio of acicular ferrite is more than 65%, and the average grain size of the steel sheet is 2-5 μm.
Preferably, the thickness of the steel plate is 3-9mm, the yield strength is not less than 820MPa, the tensile strength is not less than 880MPa, the yield ratio is not more than 0.92, the elongation is more than 20 percent, the impact fracture absorption work at-20 ℃ is more than 90J, and the impact fracture absorption work at-40 ℃ is not less than 82J; the thickness of the steel plate is 10-20mm, the yield strength is not less than 800MPa, the tensile strength is not less than 880MPa, the yield ratio is not more than 0.91, the elongation is more than 20%, the impact fracture absorption power at-20 ℃ is more than 90J, and the impact fracture absorption power at-40 ℃ is not less than 80J.
The preparation method of the Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate comprises the following specific steps:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank after smelting;
s2, heating process
Heating and insulating the steel plate blank in the step S1;
s3, rolling process
Air cooling the steel plate blank subjected to heating and heat preservation in the step S2, then removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3 times of rough rolling and 2-3 times of finish rolling to obtain a Ti-Zr composite microalloyed steel plate sample;
s4, cooling process
And (4) air-cooling the Ti-Zr composite microalloyed steel plate sample in the step (S3) to a coiling temperature, coiling, and then cooling to room temperature along with the furnace.
Preferably, in the smelting in the step S1, aluminum deoxidation is adopted in the tapping process, deep desulfurization and deoxidation are performed in the LF refining process, and then Zr alloy and ferromolybdenum are added to ensure that the components of the Zr alloy and the ferromolybdenum reach target components. Adding Ti alloy in the RH refining process at the arrival molten steel temperature of 1600-1650 ℃ in the RH refining process, performing vacuum treatment for 10min in the RH refining process, controlling the content of nitrogen and sulfur in the molten steel before adding the Ti alloy to be less than 0.005%, controlling the total vacuum treatment time in the RH refining process to be more than 20min, and then blowing argon for soft stirring to be not less than 5min.
Preferably, the heating and heat preservation temperature in the step S2 is 1150-1250 ℃, and the heat preservation time is 1-3h.
Preferably, the air cooling in the step S3 is to control the cooling rate at 2-7 ℃/S until the temperature of the steel plate blank is reduced to 1000-1100 ℃.
Preferably, the rough rolling starting temperature of the 2-3-pass rough rolling in the step S3 is 1000-1100 ℃, the final rolling temperature is 980 +/-10 ℃, the reduction of each pass is more than 20%, the total reduction is 50-60%, and the structure is an austenite structure.
Preferably, the starting temperature of the 2-3 times of finish rolling in the step S3 is the temperature of the intermediate billet which is heated to 960-975 ℃, the reduction rate of each time of rolling is more than 20%, and the finishing temperature is 800-900 ℃.
Preferably, the thickness of the steel plate blank in the step S1 is 100-120mm, the thickness of the intermediate blank in the step S3 is 50-60mm, and the thickness of the Ti-Zr composite microalloyed steel plate sample in the step S3 is 3-20mm.
Preferably, the coiling temperature in the step S4 is 600-700 ℃, and the air cooling rate is controlled at 2-7 ℃/S.
Compared with the prior art, the invention has the following beneficial effects:
in the scheme, the high strength, high toughness and low yield ratio are realized by designing alloy components, optimizing controlled rolling and controlled cooling technology and controlling the phase composition of the steel plate.
According to the invention, ti-Zr-Mo composite addition is adopted, and meanwhile, the contents of Ti, zr, mo and C are accurately controlled, so that the method is an economic component design, the yield strength and the tensile strength can be improved, the elongation rate is not easily reduced, and the low-temperature impact toughness is improved; the controlled rolling and controlled cooling production process is adopted, and extra quenching and tempering heat treatment is not needed after rolling, so that the manufacturing process is simplified, and the manufacturing cost of the steel is reduced.
The steel plate of the invention has the structure of polygonal ferrite and acicular ferrite, the proportion of acicular ferrite is more than 65 percent, and the average grain size of the steel plate is 2-5 mu m.
The thickness of the prepared steel plate is 3-9mm, the yield strength is not less than 820MPa, the tensile strength is not less than 880MPa, the yield ratio is not more than 0.92, the elongation is more than 20 percent, the impact fracture absorption power at-20 ℃ is more than 90J, and the impact fracture absorption power at-40 ℃ is not less than 82J; the thickness of the steel plate is 10-20mm, the yield strength is not less than 800MPa, the tensile strength is not less than 880MPa, the yield ratio is not more than 0.91, the elongation is more than 20%, the impact fracture absorption power at-20 ℃ is more than 90J, and the impact fracture absorption power at-40 ℃ is not less than 80J.
The invention can meet the requirements of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like in China on steel with low cost, high strength, high toughness and long service life, has strong adaptability and popularization value, and simultaneously has higher cost performance and popularization market.
In a word, the Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate and the preparation method thereof provided by the invention can improve the strength, plasticity and low-temperature impact toughness of the prepared material by utilizing Ti-Zr-Mo composite addition, and the thickness of the prepared steel plate is 3-20mm, so that the steel plate is beneficial to industrial large-scale production and popularization and application, and is suitable for being applied to the fields of engineering machinery, heavy-load bridges, energy-saving vehicles, ocean platforms and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a metallographic structure morphology chart of a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate in example 1 of the invention;
FIG. 2 is a metallographic structure morphology chart of a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate in example 2 of the invention;
FIG. 3 is a metallographic structure morphology chart of a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate in example 3 of the invention;
FIG. 4 is a metallographic structure morphology chart of a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate in example 4 of the invention;
FIG. 5 is a metallographic structure morphology of a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate in example 5 of the present invention;
FIG. 6 is a metallographic structure morphology of a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate in example 6 of the present invention.
Detailed Description
The technical solutions and the technical problems to be solved in the embodiments of the present invention will be described below with reference to the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the patent of the invention, and not all embodiments.
Example 1
A Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate is 10mm in thickness, and the chemical components thereof are measured according to the mass percentage content as follows: 0.05wt.%, si:0.215wt.%, mn:1.51wt.%, P:0.005wt.%, S:0.002wt.%, ti:0.148wt.%, mo:0.05wt.%, zr:0.015wt.%, the balance Fe and unavoidable impurities; wherein, ti: zr: mo is 148:50:15, ti + Zr: 0.213wt.%.
The specific process steps of the Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate are as follows:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank with the thickness of 100mm after smelting is finished;
s2, heating process
Heating and insulating the steel plate blank in the step S1, wherein the heating and insulating temperature is 1250 ℃, and the insulating time is 2 hours;
s3, rolling process
Air cooling the steel plate blank subjected to heating and heat preservation in the step S2, wherein the cooling rate is controlled at 5 ℃/S until the temperature of the steel plate blank is reduced to 1050 ℃; and then removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3 times of rough rolling and 2-3 times of finish rolling, wherein the 2-3 times of rough rolling are the rough rolling start temperature 1035 ℃, the finish rolling temperature 980 ℃ or so, the reduction of each time is 25%, and the total reduction is 50%. The structure is an austenite structure, the starting temperature of 2-3 times of finish rolling is the temperature of the intermediate billet when the temperature is up to 970 ℃, the thickness of the intermediate billet is 50mm, the reduction rate of each time of rolling is more than 20%, and the final rolling temperature is 850 ℃; obtaining a Ti-Zr-Mo composite microalloyed steel plate sample with the thickness of 10 mm;
s4, cooling process
And (4) water-cooling the Ti-Zr-Mo composite microalloyed steel plate sample in the step (S3) to a coiling temperature of 600 ℃, controlling the water-cooling rate in certain range, coiling, and cooling to room temperature along with the furnace to obtain the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 10 mm.
The microstructure of the Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate with the thickness of 10mm prepared in the embodiment is shown in figure 1, the microstructure is a polygonal ferrite structure and an acicular ferrite structure, the proportion of the acicular ferrite is 68%, and the average grain size of the steel plate is 3.1 mu m. Mechanical properties: the yield strength is 807MPa, the tensile strength is 885MPa, the expansion and contraction rate after fracture is 20.8 percent, the impact fracture absorption work at the temperature of minus 20 ℃ is 92J, and the impact fracture absorption work at the temperature of minus 40 ℃ is 80J.
The Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 10mm prepared by the embodiment can be applied to any one of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like.
Example 2
A Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate is 6mm in thickness, and the chemical components are measured according to the mass percentage content, namely C:0.05wt.%, si:0.215wt.%, mn:1.51wt.%, P:0.005wt.%, S:0.002wt.%, ti:0.148wt.%, mo:0.07wt.%, zr:0.02wt.%, the balance Fe and unavoidable impurities; wherein, ti: zr: mo is 37:15:5, ti + Zr + Mo: 0.238wt.%.
The specific process steps of the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength high-toughness steel plate are as follows:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank with the thickness of 100mm after smelting is finished;
s2, heating process
Heating and insulating the steel plate blank in the step S1, wherein the heating and insulating temperature is 1150 ℃, and the insulating time is 1h;
s3, rolling process
Air cooling the steel plate blank subjected to heating and heat preservation in the step S2, wherein the cooling rate is controlled at 7 ℃/S until the temperature of the steel plate blank is reduced to 1000 ℃; removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3-pass rough rolling and 2-3-pass finish rolling, the 2-3-pass rough rolling is that the initial rolling temperature of the rough rolling is 1000 ℃, the final rolling temperature is 990 ℃, the reduction of each pass is more than 20%, the total reduction is 50%, the structure is an austenite structure, the starting temperature of the 2-3-pass finish rolling is the temperature of the intermediate billet which is heated to 960 ℃, the thickness of the intermediate billet is 50mm, the reduction of each pass is more than 20%, and the final rolling temperature is 830 ℃; obtaining a Ti-Zr-Mo composite microalloyed steel plate sample with the thickness of 6 mm;
s4, cooling process
And (4) air-cooling the Ti-Zr-Mo composite microalloyed steel plate sample in the step (S3) to a coiling temperature of 600 ℃, controlling the air cooling rate at 7 ℃/S, coiling, and then cooling to room temperature along with the furnace to obtain the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 6 mm.
The microstructure of the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength high-toughness steel plate with the thickness of 6mm prepared in the embodiment is shown in figure 2, the microstructure is a polygonal ferrite and acicular ferrite structure, the proportion of acicular ferrite is 78%, and the average grain size of the steel plate is 2.8 μm. Mechanical properties: the yield strength is 835MPa, the tensile strength is 902MPa, the expansion and contraction rate after fracture is 21.7 percent, the impact fracture absorption work at the temperature of minus 20 ℃ is 98J, and the impact fracture absorption work at the temperature of minus 40 ℃ is 82J.
The Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 6mm prepared by the embodiment can be applied to any one of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like.
Example 3
A Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate is 12mm in thickness, and comprises the following chemical components in percentage by mass: 0.04wt.%, si:0.245wt.%, mn:1.48wt.%, P:0.005wt.%, S:0.003wt.%, ti:0.2wt.%, mo:0.15wt.%, zr:0.07wt.%, balance Fe and unavoidable impurities; wherein, ti: zr: mo is 20:15:7, ti +, zr + Mo: 0.42wt.%.
The specific process steps of the Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate are as follows:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank with the thickness of 120mm after smelting is finished;
s2, heating process
Heating and insulating the steel plate blank in the step S1, wherein the heating and insulating temperature is 1205 ℃, and the insulating time is 3 hours;
s3, rolling process
Air-cooling the steel plate blank subjected to heating and heat preservation in the step S2, wherein the cooling rate is controlled at 4 ℃/S until the temperature of the steel plate blank is reduced to 1080 ℃; then removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3 times of rough rolling and 2-3 times of finish rolling, the 2-3 times of rough rolling comprises a rough rolling start temperature of 1050 ℃, a finish rolling temperature of 980 ℃, a reduction of 25% per time and a total reduction of 50%, the structure is an austenite structure, the 2-3 times of finish rolling start temperature is the temperature of the intermediate blank to be warmed to 970 ℃, the thickness of the intermediate blank is 60mm, the reduction rate of each time of rolling is more than 20%, and the finish rolling temperature is 850 ℃; obtaining a Ti-Zr-Mo composite microalloyed steel plate sample with the thickness of 12 mm;
s4, cooling process
And (4) air-cooling the Ti-Zr-Mo composite microalloyed steel plate sample in the step (S3) to a coiling temperature of 650 ℃, controlling the air cooling rate at 4 ℃/S, coiling, and then cooling to room temperature along with the furnace to obtain the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 12 mm.
The microstructure of the Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate with the thickness of 12mm prepared in the embodiment is shown in FIG. 3, the microstructure is polygonal ferrite and acicular ferrite, the proportion of acicular ferrite is 71%, and the average grain size of the steel plate is 3.3 μm. Mechanical properties: the yield strength is 905MPa, the tensile strength is 980MPa, the expansion and contraction rate after fracture is 22 percent, the impact fracture absorption work at the temperature of minus 20 ℃ is 91J, and the impact fracture absorption work at the temperature of minus 40 ℃ is 79J.
The Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate with the thickness of 12mm prepared by the embodiment can be applied to any one of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like.
Example 4
A Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate is 15mm in thickness, and comprises the following chemical components in percentage by mass: 0.04wt.%, si:0.215wt.%, mn:1.41wt.%, P:0.005wt.%, S:0.002wt.%, ti:0.158wt.%, mo:0.07wt.%, zr:0.045wt.%, balance Fe and unavoidable impurities; wherein, ti: zr: mo is 158:70:45, ti + Zr: 0.273wt.%.
The specific process steps of the Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate are as follows:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank with the thickness of 100mm after smelting is finished;
s2, heating process
Heating and insulating the steel plate blank in the step S1, wherein the heating and insulating temperature is 1200 ℃, and the insulating time is 1h;
s3, rolling process
Air cooling the steel plate blank subjected to heating and heat preservation in the step S2, wherein the cooling rate is controlled at 5 ℃/S until the temperature of the steel plate blank is reduced to 1050 ℃; removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3 times of rough rolling and 2-3 times of finish rolling, the 2-3 times of rough rolling is that the rough rolling starting temperature is 1035 ℃, the finish rolling temperature is 1000 ℃, the reduction per time is 20%, the total reduction is 40%, the structure is an austenite structure, the 2-3 times of finish rolling starting temperature is the temperature of the intermediate billet when the temperature is 975 ℃, the thickness of the intermediate billet is 60mm, the reduction per time of rolling is more than 20%, and the finish rolling temperature is 820 ℃; obtaining a Ti-Zr-Mo composite microalloyed steel plate sample with the thickness of 15 mm;
s4, cooling process
And (4) air-cooling the Ti-Zr-Mo composite microalloyed steel plate sample obtained in the step (S3) to a coiling temperature of 700 ℃, controlling the air cooling rate at 5 ℃/S, coiling, and then cooling to room temperature along with a furnace to obtain the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 15 mm.
The microstructure of the Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate with the thickness of 15mm prepared in the embodiment is shown in FIG. 4, the microstructure is a polygonal ferrite structure and an acicular ferrite structure, the proportion of the acicular ferrite is 73%, and the average grain size of the steel plate is 2.8 μm. Mechanical properties: the yield strength is 833MPa, the tensile strength is 925MPa, the expansion and contraction rate after fracture is 22.5 percent, the impact fracture absorption work at the temperature of minus 20 ℃ is 98J, and the impact fracture absorption work at the temperature of minus 40 ℃ is 83J.
The Ti-Zr-Mo composite microalloyed 800MPa grade high-strength high-toughness steel plate with the thickness of 15mm prepared by the embodiment can be applied to any one of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like.
Example 5
A Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate is 10mm in thickness, and the chemical components thereof are measured according to the mass percentage content as follows: 0.05wt.%, si:0.271wt.%, mn:1.60wt.%, P:0.005wt.%, S:0.005wt.%, ti:0.138wt.%, mo:0.12wt.%, zr:0.035wt.%, the balance Fe and unavoidable impurities; wherein, ti: zr: mo is 138:120:35, ti + Zr: 0.293wt.%.
The specific process steps of the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength high-toughness steel plate are as follows:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank with the thickness of 100mm after smelting is finished;
s2, heating process
Heating and insulating the steel plate blank in the step S1, wherein the heating and insulating temperature is 1150 ℃, and the insulating time is 2 hours;
s3, rolling process
Air cooling the steel plate blank subjected to heating and heat preservation in the step S2, wherein the cooling rate is controlled at 3 ℃/S until the temperature of the steel plate blank is reduced to 1035 ℃; removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3 times of rough rolling and 2-3 times of finish rolling, the 2-3 times of rough rolling is that the initial rolling temperature of the rough rolling is 1000 ℃, the final rolling temperature is about 980 ℃, the reduction of each time is 25%, the total reduction is 50%, the structure is an austenite structure, the starting temperature of the 2-3 times of finish rolling is the temperature of the intermediate billet to be 968 ℃, the thickness of the intermediate billet is 50mm, the reduction of each time of rolling is more than 20%, and the final rolling temperature is 870 ℃; obtaining a Ti-Zr-Mo composite microalloyed steel plate sample with the thickness of 10 mm;
s4, cooling process
And (4) air-cooling the Ti-Zr-Mo composite microalloyed steel plate sample in the step (S3) to a coiling temperature of 650 ℃, controlling the air cooling rate at 3 ℃/S, coiling, and then cooling to room temperature along with a furnace to obtain the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 10 mm.
The microstructure of the Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate with the thickness of 10mm prepared in the example is shown in FIG. 5, the microstructure is polygonal ferrite and acicular ferrite, the proportion of acicular ferrite is 75%, and the average grain size of the steel plate is 2.8 μm. Mechanical properties: the yield strength is 812MPa, the tensile strength is 894MPa, the expansion and contraction rate after fracture is 20.5 percent, the impact fracture absorption work at-20 ℃ is 101J, and the impact fracture absorption work at-40 ℃ is 89J.
The Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 10mm prepared by the embodiment can be applied to any one of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like.
Example 6
A Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate is 20mm in thickness, and comprises the following chemical components in percentage by mass: 0.05wt.%, si:0.215wt.%, mn:1.51wt.%, P:0.005wt.%, S:0.002wt.%, ti:0.148wt.%, mo:0.10wt.%, zr:0.035wt.%, the balance Fe and unavoidable impurities; wherein, ti: zr: mo is 148:100:35, ti + Zr: 0.283wt.%.
The specific process steps of the Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate are as follows:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank with the thickness of 100mm after smelting;
s2, heating process
Heating and insulating the steel plate blank in the step S1, wherein the heating and insulating temperature is 1150 ℃, and the insulating time is 3 hours;
s3, rolling process
Air cooling the steel plate blank subjected to heating and heat preservation in the step S2, wherein the cooling rate is controlled at 7 ℃/S until the temperature of the steel plate blank is reduced to 1000-1100 ℃; then removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3 times of rough rolling and 2-3 times of finish rolling, the 2-3 times of rough rolling is that the initial rolling temperature of the rough rolling is 1000 ℃, the final rolling temperature is 980 ℃, the reduction of each time is more than 25%, the total reduction is 50%, the structure is an austenite structure, the starting temperature of the 2-3 times of finish rolling is the temperature of the intermediate billet which is heated to 975 ℃, the thickness of the intermediate billet is 60mm, the reduction of each time of rolling is more than 20%, and the final rolling temperature is 890 ℃; obtaining a Ti-Zr-Mo composite microalloyed steel plate sample with the thickness of 20 mm;
s4, cooling process
And (4) air-cooling the Ti-Zr-Mo composite microalloyed steel plate sample in the step (S3) to a coiling temperature of 600 ℃, controlling the air cooling rate at 7 ℃/S, coiling, and then cooling to room temperature along with the furnace to obtain the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate with the thickness of 20mm.
The microstructure of the Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate with the thickness of 20mm prepared in the embodiment is shown in FIG. 6, the microstructure is polygonal ferrite and acicular ferrite, the proportion of acicular ferrite is 68%, and the average grain size of the steel plate is 3.2 μm. Mechanical properties: the yield strength is 805MPa, the tensile strength is 882MPa, the expansion and contraction rate after fracture is 20.5 percent, the impact fracture absorption work at-20 ℃ is 92J, and the impact fracture absorption work at-40 ℃ is 87J.
The Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate with the thickness of 20mm prepared by the embodiment can be applied to any one of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like.
In summary, the comparison of examples 1 to 6 shows that the addition of Ti-Zr-Mo in combination increases the yield strength and tensile strength, and at the same time, does not reduce the elongation well, and improves the low temperature impact toughness.
In the scheme, the high strength, high toughness and low yield ratio are realized by designing alloy components, optimizing controlled rolling and controlled cooling technology and controlling the phase composition of the steel plate.
According to the invention, ti-Zr-Mo composite addition is adopted, and meanwhile, the contents of Ti, zr, mo and C are accurately controlled, so that the method is an economic component design, the yield strength and the tensile strength can be improved, the elongation rate is not easily reduced, and the low-temperature impact toughness is improved; the controlled rolling and controlled cooling production process is adopted, and extra quenching and tempering heat treatment is not needed after rolling, so that the manufacturing process is simplified, and the manufacturing cost of the steel is reduced.
The structure of the steel plate is polygonal ferrite and acicular ferrite, the proportion of the acicular ferrite is more than 65 percent, and the average grain size of the steel plate is 2-5 mu m.
The thickness of the prepared steel plate is 3-9mm, the yield strength is not less than 820MPa, the tensile strength is not less than 880MPa, the yield ratio is not more than 0.92, the elongation is more than 20%, the impact fracture absorption work at-20 ℃ is more than 90J, and the impact fracture absorption work at-40 ℃ is not less than 82J; the thickness of the steel plate is 10-20mm, the yield strength is not less than 800MPa, the tensile strength is not less than 880MPa, the yield ratio is not more than 0.91, the elongation is more than 20%, the impact fracture absorption power at-20 ℃ is more than 90J, and the impact fracture absorption power at-40 ℃ is not less than 80J.
The invention can meet the requirements of the fields of engineering machinery, heavy-duty bridges, energy-saving vehicles, ocean platforms and the like in China on steel with low cost, high strength, high toughness and long service life, has strong adaptability and popularization value, and simultaneously has higher cost performance and popularization market.
In a word, the Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate and the preparation method thereof provided by the invention can improve the strength, plasticity and low-temperature impact toughness of the prepared material by utilizing Ti-Zr-Mo composite addition, and the thickness of the prepared steel plate is 3-20mm, so that the steel plate is beneficial to industrial large-scale production and popularization and application, and is suitable for being applied to the fields of engineering machinery, heavy-load bridges, energy-saving vehicles, ocean platforms and the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.
Claims (10)
1. A Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength and high-toughness steel plate is characterized by comprising the following chemical components in percentage by mass: c:0.02-0.05wt.%, si:0.20-0.30wt.%, mn:1.40-1.80wt.%, P.ltoreq.0.008 wt.%, S.ltoreq.0.008 wt.%, ti:0.08-0.20wt.%, mo:0.05-0.15wt.%, zr:0.01-0.07wt.%, the balance being Fe and unavoidable impurities; wherein, ti: zr is 1.14:1-20:1, ti: mo is 0.53:1-4:1, zr: mo is 0.07:1-1.4:1, ti + Zr + Mo:0.14-0.42wt.%.
2. The Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate according to claim 1, characterized in that the structure of the steel plate is polygonal ferrite and acicular ferrite, the proportion of the acicular ferrite is more than 65 percent, and the average grain size of the steel plate is 2 to 5 μm.
3. The Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate according to claim 1, characterized in that the steel plate has a thickness of 3-9mm, a yield strength of not less than 820MPa, a tensile strength of not less than 880MPa, a yield ratio of not more than 0.92, an elongation of more than 20%, an impact fracture absorption power of more than 90J at-20 ℃, and an impact fracture absorption power of not less than 82J at-40 ℃; the thickness of the steel plate is 10-20mm, the yield strength is not less than 800MPa, the tensile strength is not less than 880MPa, the yield ratio is not more than 0.91, the elongation is more than 20%, the impact fracture absorption power at-20 ℃ is more than 90J, and the impact fracture absorption power at-40 ℃ is not less than 80J.
4. The method for preparing a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate according to any one of claims 1 to 3, characterized by comprising the following steps:
s1, smelting process
Weighing, proportioning and smelting the raw materials according to the mass percentage of the chemical components of the steel plate, and casting the steel plate blank after smelting;
s2, heating process
Heating and insulating the steel plate blank in the step S1;
s3, rolling process
Air cooling the steel plate blank subjected to heating and heat preservation in the step S2, then removing phosphorus, and then carrying out hot rolling, wherein the hot rolling comprises 2-3 times of rough rolling and 2-3 times of finish rolling to obtain a Ti-Zr composite microalloyed steel plate sample;
s4, cooling process
And (4) air-cooling the Ti-Zr composite microalloyed steel plate sample in the step (S3) to a coiling temperature, coiling, and then cooling to room temperature along with the furnace.
5. The method for preparing a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate according to claim 4, wherein the heating and heat preservation temperature in the step S2 is 1150-1250 ℃ and the heat preservation time is 1-3h.
6. The method for manufacturing a Ti-Zr-Mo composite microalloyed high strength and high toughness steel sheet of 800MPa grade according to claim 2, wherein the air cooling in the step S3 is to control the cooling rate at 2-7 ℃/S until the temperature of the steel sheet slab is lowered to 1000-1100 ℃.
7. The method for preparing the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate according to the claim 4, wherein the rough rolling start temperature of 2-3 times of rough rolling in the step S3 is 1000-1100 ℃, the finish rolling temperature is 980 +/-10 ℃, the reduction of each time is more than 20%, the total reduction is 50-60%, and the structure is austenite.
8. The method for preparing the Ti-Zr-Mo composite microalloyed 800MPa grade high-strength and high-toughness steel plate according to claim 4, wherein the 2-3 times of finish rolling in the step S3 is performed at the starting temperature of the intermediate billet which is heated to 960-975 ℃, the reduction rate of each time of rolling is more than 20%, and the finish rolling temperature is 800-900 ℃.
9. The method of manufacturing a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate according to claim 4, wherein the thickness of the steel plate blank in the step S1 is 100 to 120mm, the thickness of the intermediate blank in the step S3 is 50 to 60mm, and the thickness of the Ti-Zr composite microalloyed steel plate sample in the step S3 is 3 to 20mm.
10. The method for producing a Ti-Zr-Mo composite microalloyed 800MPa grade high strength and high toughness steel plate according to claim 4, wherein the coiling temperature in the step S4 is 600-700 ℃ and the air cooling rate is controlled to 2-7 ℃/S.
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