CN114134389B - High-strength steel plate with yield strength of 890MPa and manufacturing method thereof - Google Patents
High-strength steel plate with yield strength of 890MPa and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
Abstract
The invention relates to the technical field of metal material manufacturing, in particular to a high-strength steel plate with a yield strength of 890MPa and a manufacturing method thereof. The manufacturing method comprises the following steps: (1) smelting; (2) continuous casting: the thickness of the casting blank is 150-300 mm; (3) heating: the tapping temperature after heating is controlled to be 1150-1190 ℃; (4) rolling: the rough rolling initial rolling temperature is 1080-1120 ℃, and the thickness of the intermediate blank is more than 2.5 times of the thickness of the finished product; the initial rolling temperature of the finish rolling is 900-940 ℃, and the finish rolling temperature of the finish rolling is 830-870 ℃; and (5) DQ water cooling: the initial cooling temperature is 800-840 ℃, and the final cooling temperature is less than or equal to 180 ℃; (6) tempering: the tempering heating temperature is 150-300 ℃, and the heat preservation time is 40-90 min. The invention realizes the ultra-low cost production of the Q890 steel plate by optimizing the alloy component design, shortening the process flow and reducing the heat treatment cost.
Description
Technical Field
The invention relates to the technical field of metal material manufacturing, in particular to a high-strength steel plate with a yield strength of 890MPa and a manufacturing method thereof.
Background
In recent years, the engineering machinery industry is rapidly developed, and with the continuous development of heavy machinery towards large-scale and self-weight light-weight, the demand of high-strength structural steel is gradually increased year by year, and high-grade products are favored by the manufacturers of the engineering machinery. The high-strength steel plate with yield strength more than or equal to 890MPa for the engineering machinery is a high-end product in the high-strength steel field for the engineering machinery, and is mainly applied to key positions of large equipment such as an arm support of a concrete pump truck, a telescopic boom of an automobile crane, a pulling plate of a crawler crane and the like. At present, for the production of 890MPa grade high-strength steel, higher alloy elements such as Cr, mo, ni, nb, V, ti and the like are generally added, and a thermal treatment mode of quenching and tempering (offline quenching and high-temperature tempering) is adopted, so that the alloy cost and the thermal treatment cost are increased inevitably, and the method is not beneficial to energy conservation and environmental protection. How to achieve the purposes of saving the production cost and obtaining a steel plate with excellent performance becomes one of the development directions of the high-strength structural steel for the engineering machinery at present.
Chinese patent application CN201610707878.8 discloses a method for producing a high-strength steel Q890 medium plate by on-line quenching, which adopts a method of combining on-line quenching with tempering at 550 +/-10 ℃ to produce the Q890 medium plate, and has the disadvantages that alloy elements such as Cr, mo, ni, V, nb and the like are added at the same time, and the alloy cost is high; the casting blank with the thickness of 150mm is adopted to produce steel plates with the thickness of 16-50 mm, and the phenomenon of insufficient reduction amount can be caused when the thickness of the casting blank is too small for steel plates with the thickness of more than 40mm; in addition, the tempering temperature is higher due to the adoption of the tempering at 500 +/-10 ℃, which is not beneficial to saving energy and inevitably increases the production cost.
The Chinese patent application CN201611080452.0 discloses a method for rolling and heat-treating high-strength steel with yield strength of 900MPa grade applied to engineering machinery such as a concrete pump truck, and the like, which has the disadvantages that a heat treatment mode of quenching and tempering (offline quenching and high-temperature tempering) is adopted, the energy consumption is large, and the production cost is increased; in addition, for the production of steel plates, steel coils need to be opened and cut flatly and then straightened into steel plates, flatting equipment is needed, and the process flow is long.
In the prior art, for the production of a high-strength steel plate with a yield strength of 890MPa level, the defects of high alloy cost, long production process flow, high heat treatment cost and the like exist, and the production requirements of the steel industry on low cost, energy conservation, environmental protection and high-efficiency manufacturing at the present stage cannot be met.
Disclosure of Invention
Aiming at the problems of high alloy cost, long production process flow and high heat treatment cost of the conventional production process of the 890MPa grade high-strength steel, the invention provides the 890MPa grade high-strength steel plate with the yield strength and the manufacturing method thereof, and the Q890 steel plate is produced at ultralow cost by optimizing the alloy component design, shortening the process flow and reducing the heat treatment cost.
In a first aspect, the present invention provides a method for manufacturing a high strength steel sheet having a yield strength of 890MPa level, comprising the steps of:
(1) Smelting: according to weight percentage, the smelting chemical composition is C: 0.08-0.12%, si: 0.10-0.40%, mn: 1.35-1.65%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, cr: 0.20-0.50%, ti:0.008% -0.025%, als:0.020% -0.050%, B:0.0010 to 0.0025 percent, less than or equal to 0.0030 percent of O, less than or equal to 0.0040 percent of N, less than or equal to 0.0002 percent of H, and the balance of ferrum and inevitable impurities, wherein the Carbon Equivalent (CEV) = C + Mn/6+ (Ni + Cu)/15 + (Cr + Mo + V)/5 is less than or equal to 0.50 percent;
(2) Continuous casting: the thickness of the casting blank is 150-300 mm;
(3) Heating: the tapping temperature is controlled to be 1150-1190 ℃ after heating;
(4) Rolling: the initial rolling temperature of rough rolling is 1080-1120 ℃, the whole course of the rough rolling stage is rolled at high temperature (1040-1120 ℃), the core tissue of the steel plate is subjected to osmotic deformation by combining with large rolling reduction, the rolling reduction rate of at least 2-3 passes is more than or equal to 20%, and the thickness of the intermediate blank is more than 2.5 times of that of the finished product; the initial rolling temperature of the finish rolling is 900-940 ℃, and the finish rolling temperature of the finish rolling is 830-870 ℃;
(5) Water cooling of DQ: the initial cooling temperature is 800-840 ℃, and the final cooling temperature is less than or equal to 180 ℃;
(6) Tempering: the tempering heating temperature is 150-300 ℃, and the heat preservation time is 40-90 min, thus obtaining the finished product.
Further, the superheat degree of the tundish in the step (2) is controlled to be 10-20 ℃, the whole process is protected for pouring, and the casting blank is stacked and slowly cooled.
Further, the stacking slow cooling in the step (2) adopts a hot blank lower laying and upper covering mode, the periphery of the stacking slow cooling is surrounded by the hot blanks, air blowing is avoided, and the cooling time is more than 48 hours.
Further, the heating time in the step (3) is 3-5 h.
Further, high-pressure water descaling is carried out before rough rolling in the step (4), and the pressure of the descaling water is more than or equal to 23MPa.
Further, the cooling speed in the step (5) is controlled to be 18-30 ℃/s.
In a second aspect, the invention provides a high-strength steel plate with a yield strength of 890MPa, which is produced by the manufacturing method.
Furthermore, the thickness of the 890 MPa-grade high-strength steel plate with the yield strength is 10-30 mm.
The invention has the beneficial effects that:
(1) The alloy component design is optimized, noble metal elements such as Ni, mo, V, cu, nb and the like are not required to be added, and the ultra-low cost alloy component design is realized; (2) Off-line quenching is not needed, and an on-line quenching (DQ water cooling) and low-temperature tempering process is adopted, so that the process flow is greatly shortened, the heat treatment cost is reduced, and the energy consumption is reduced; (3) Realizes the component design with lower carbon equivalent (CEV is less than or equal to 0.50 percent) and has excellent welding performance of the steel plate.
The manufacturing method realizes the production of the ultra-low-cost 890 MPa-level high-strength steel plate with the yield strength Rp of the steel 0.2 : 920-1000 MPa, tensile strength R m : 960-1040 MPa, elongation after break A: 11-16 percent of impact absorption power KV at-20 DEG C 2 : 60-150J, proper performance margin and stable quality.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a typical metallographic structure photograph of a high strength steel sheet having a yield strength of 890MPa grade produced in example 1 of the present invention.
FIG. 2 is a typical metallographic structure photograph of a high strength steel sheet having a yield strength of 890MPa produced in example 2 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high-strength steel plate with the thickness of 10mm and the yield strength of 890MPa grade is prepared by adopting the following manufacturing method:
(1) Smelting: according to smelting chemical composition C:0.10%, si:0.31%, mn:1.46%, P:0.006%, S:0.001%, cr:0.29%, ti:0.018%, als:0.033%, B:0.0015%, O:0.0022%, N:0.0031%, H:0.00017 percent, the balance of iron and inevitable impurities, CEV =0.40 percent for smelting, and strictly controlling harmful elements and inclusions such as S, P, O, N, H and the like;
(2) Continuous casting: the superheat degree of the tundish is controlled at 10-20 ℃, and the whole process is protected for pouring; the thickness of the casting blank is 150mm, the casting blank is stacked and slowly cooled for 50h, an upper cover is laid under the hot blank, and the periphery of the upper cover is surrounded by the hot blank, so that air blowing is avoided;
(3) Heating: reheating a continuous casting billet for 3.2 hours, and discharging at 1182 ℃ after heating;
(4) Rolling: carrying out high-pressure water descaling on the heated continuous casting billet, wherein the descaling water pressure is more than or equal to 23MPa; the initial rolling temperature of rough rolling is 1114 ℃, wherein the rolling reduction rate of the last 2 passes is more than or equal to 20 percent, and the thickness of the intermediate billet is 40mm; the initial rolling temperature of finish rolling is 938 ℃ and the finish rolling temperature of finish rolling is 842 ℃;
(5) DQ water cooling: the start cooling temperature is 806 ℃, the end cooling temperature is 160 ℃, and the cooling speed is controlled at 18-30 ℃/s;
(6) Tempering: the tempering heating temperature is 280 ℃, and the heat preservation time is 40min, thus obtaining the finished product.
The mechanical properties of the steel sheet were measured, and the results are shown in table 1 below.
Table 1 mechanical properties of the steel sheets of example 1
Example 2
The 890 MPa-level high-strength steel plate with the yield strength of 30mm is prepared by the following manufacturing method:
(1) Smelting: according to smelting chemical composition C:0.12%, si:0.36%, mn:1.61%, P:0.008%, S:0.001%, cr:0.45%, ti:0.022%, als:0.045%, B:0.0020%, O:0.0023%, N:0.0030%, H:0.00016 percent, the balance of iron and inevitable impurities, CEV =0.48 percent of smelting, and strictly controlling harmful elements and inclusions such as S, P, O, N, H and the like;
(2) Continuous casting: the superheat degree of the tundish is controlled at 10-20 ℃, and the whole process is protected for pouring; the thickness of the casting blank is 300mm, the casting blank is stacked and slowly cooled for 66h, a hot blank is adopted, an upper cover is laid at the lower part, the periphery is surrounded by the hot blank, and air blowing is avoided;
(3) Heating: reheating the continuous casting billet for 4.8h, and then discharging at 1162 ℃;
(4) Rolling: carrying out high-pressure water descaling on the heated continuous casting billet, wherein the descaling water pressure is more than or equal to 23MPa; the initial rolling temperature of rough rolling is 1084 ℃, wherein the rolling reduction rate of the last 3 passes is more than or equal to 20%, and the thickness of the intermediate billet is 85mm; the initial rolling temperature of finish rolling is 914 ℃, and the finish rolling temperature of finish rolling is 859 ℃;
(5) Water cooling of DQ: the opening cooling temperature is 836 ℃, the final cooling temperature is 160 ℃, and the cooling speed is controlled to be 18-30 ℃/s;
(6) Tempering: the tempering heating temperature is 230 ℃, and the heat preservation time is 80min, thus obtaining the finished product.
The mechanical properties of the steel sheet were measured, and the results are shown in table 2 below.
Table 2 mechanical properties of the steel sheets of example 2
Although the present invention has been described in detail in connection with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. A manufacturing method of a high-strength steel plate with a 890 MPa-level yield strength is characterized by comprising the following steps:
(1) Smelting: according to weight percentage, the smelting chemical composition is C: 0.08-0.12%, si: 0.10-0.40%, mn: 1.35-1.65%, P is less than or equal to 0.010%, S is less than or equal to 0.003%, cr: 0.20-0.50%, ti:0.008% -0.025%, als:0.020 to 0.050%, B:0.0010 to 0.0025 percent, less than or equal to 0.0030 percent of O, less than or equal to 0.0040 percent of N, less than or equal to 0.0002 percent of H, and the balance of iron and inevitable impurities, wherein the carbon equivalent is less than or equal to 0.50 percent;
(2) Continuous casting: the thickness of the casting blank is 150-300 mm;
(3) Heating: the tapping temperature after heating is controlled to be 1150-1190 ℃;
(4) Rolling: the initial rolling temperature of rough rolling is 1080-1120 ℃, the whole course of the rough rolling stage is rolled at high temperature, the penetration deformation of the core structure of the steel plate is realized by combining large rolling reduction, the rolling reduction rate of at least 2-3 passes is more than or equal to 20 percent, and the thickness of the intermediate blank is more than 2.5 times of that of the finished product; the initial rolling temperature of the finish rolling is 900-940 ℃, and the finish rolling temperature of the finish rolling is 830-870 ℃;
(5) Water cooling of DQ: the initial cooling temperature is 800-840 ℃, and the final cooling temperature is less than or equal to 180 ℃;
(6) Tempering: tempering and heating at 150-300 deg.c for 40-90 min to obtain the product;
yield strength Rp of steel 0.2 : 920-1000 MPa, tensile strength R m ：960～1040MPa。
2. The manufacturing method according to claim 1, wherein the superheat degree of the tundish in the step (2) is controlled to be 10-20 ℃, the casting is protected in the whole process, and the casting blank is stacked and slowly cooled.
3. The manufacturing method of claim 2, wherein the stacking slow cooling of step (2) adopts a mode of covering the hot blank at the lower part and covering the hot blank at the upper part, the hot blank is surrounded at the periphery to avoid air blowing, and the cooling time is more than 48 h.
4. The method of claim 1, wherein the heating time in step (3) is 3 to 5 hours.
5. The method of claim 1, wherein the step (4) of descaling with high-pressure water is performed before rough rolling, and the descaling water pressure is 23MPa or more.
6. The manufacturing method according to claim 1, wherein the cooling rate in the step (5) is controlled to 18 to 30 ℃/s.
7. A high strength steel sheet having a yield strength of 890MPa grade produced by the production method according to any one of claims 1 to 6.
8. The high-strength steel sheet having a yield strength of 890MPa level according to claim 7, wherein the thickness of said high-strength steel sheet having a yield strength of 890MPa level is 10 to 30mm.
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