CN113186454A - Production method of tempered low-yield-ratio bridge steel - Google Patents
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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
- C22C38/02—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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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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
- 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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- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Abstract
A production method of tempered bridge steel with low yield ratio comprises the following process routes of molten iron pretreatment → a converter → refining → continuous casting → heating → rolling → cooling → tempering, wherein the chemical composition content of the steel is C =0.07% -0.09%, Si =0.20% -0.30%, Mn =1.52% -1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Alt =0.020% -0.045%, Nb =0.01% -0.030%, Ti =0.012% -0.020%, Cr =0.16% -0.20%, Mo =0.08% -0.12%, Cu =0.16% -0.20%, Pcm is less than or equal to 0.22%, and the balance is Fe and inevitable impurities. The steel produced by the method has the advantages of low cost, narrow components and the like, the steel plate with the thickness of 6-50 mm is produced, the yield strength is more than or equal to 420MPa, the yield ratio is less than or equal to 0.80, the impact toughness at minus 40 ℃ is more than or equal to 200J, the manufacturing cost of the steel plate is low, and the steel plate has low yield ratio, high strength, high low-temperature toughness and the like.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a production method of tempered low-yield-ratio bridge steel.
Background
With the rapid development of economic construction and the construction of large-span, complex-structure and large-flow bridges, the demand of high-performance steel for bridge structures is increasing. In consideration of light design, safety and reliability, low maintenance cost, service life and the like, high strength, high low temperature toughness resistance, corrosion resistance and low yield ratio become the main development directions of modern bridge structural steel, and research and development of high-performance bridge steel with higher strength level has important significance for promoting the development of bridge construction.
U.S. Pat. No. 6,56833 discloses a thermomechanically rolled high-strength low-yield-ratio atmospheric corrosion resistant steel, which comprises the following chemical components in percentage by weight: c = 0.08-0.12%, Mn = 0.80-1.35%, Si = 0.30-0.65%, Mo = 0.08-0.35%, V = 0.06-0.14%, Cu = 0.20-0.40%, Cr = 0.30-0.70%, Ni is less than or equal to 0.50%, Nb is less than or equal to 0.04%, Ti is less than or equal to 0.02%, S is less than or equal to 0.01%, P is less than or equal to 0.02%, N = 1-14 ppm, and the balance is Fe and trace impurities. The yield strength of the steel is 485MPa, and the yield ratio is 0.85. The patent adds more alloy, and manufacturing cost is high, and the yield ratio is higher.
Chinese patent CN109550806A discloses a method for producing a 420MPa grade bridge steel plate with low yield ratio, which adopts the traditional TMCP process, has low final cooling temperature, large internal stress of the steel plate after cooling, influences the flatness of the steel plate and indirectly influences the welding quality.
Chinese patent CN106811704A discloses a bridge steel with 420MPa grade yield strength and low yield ratio and a manufacturing method thereof, wherein alloy elements Cr =0.40% -1.00% and Ni =0.05% -0.20%, because of the high content of Cr, although the hardenability of the steel is improved, the toughness of the material is improved by adding Ni, the excessive addition of expensive alloy elements can substantially increase the manufacturing cost, and the benefit is difficult to create for enterprises in the industrial production.
Chinese patent CN107236905A discloses a 600MPa grade high-strength low-yield-ratio structural steel plate and a manufacturing method thereof, wherein the steel plate is characterized in that the alloy elements Ni =0.14% -0.18%, Mn =1.0% -1.7%, the contents of Mn and Ni are high and the production cost is high.
In summary, the existing steel plate for the bridge with the low yield ratio has many defects: (1) more precious alloy is added, and the manufacturing cost is high; (2) the traditional cooling process has poor steel plate flatness, and is not beneficial to the processing of downstream procedures; (3) the impact toughness was unstable.
Disclosure of Invention
The invention aims to provide a production method of tempered low-yield-ratio bridge steel, which aims to solve the technical problem of production in the existing low-yield-ratio bridge steel process. The produced steel plate has the thickness of 6-50 mm, the yield strength of more than or equal to 420MPa, the yield ratio of less than or equal to 0.80, the impact toughness of more than or equal to 200J at minus 40 ℃, the manufacturing cost of the steel plate is low, and the steel plate has low yield ratio, high strength and strong low-temperature toughness.
The technical scheme of the invention is as follows:
a production method of tempered bridge steel with low yield ratio comprises the following process routes of molten iron pretreatment → a converter → refining → continuous casting → heating → rolling → cooling → tempering, wherein the chemical components of the steel comprise, by weight, C =0.07% -0.09%, Si =0.20% -0.30%, Mn =1.52% -1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Alt =0.020% -0.045%, Nb =0.01% -0.030%, Ti =0.012% -0.020%, Cr =0.16% -0.20%, Mo =0.08% -0.12%, Cu =0.16% -0.20%, Pcm is less than or equal to 0.22%, and the balance is Fe and inevitable impurities; the method comprises the following key process steps:
(1) heating: the casting blank is directly installed, namely the hot casting blank pulled out by continuous casting does not need to be cooled by stacking, and is directly conveyed to a heating furnace through a conveying roller way, the feeding temperature is 420-650 ℃, the hearth temperature is 1100-1200 ℃, and the total time in the furnace is 120-180 min;
(2) rough rolling: setting the thickness of the intermediate blank to be more than or equal to 2.5 times of the thickness of a finished product, wherein the initial rolling temperature is 1120-1160 ℃, the final rolling temperature is more than or equal to 980 ℃, the pass is 5-9, and the cumulative reduction rate is more than or equal to 50%;
(3) finish rolling: the initial rolling temperature is 860-920 ℃, the final rolling temperature is 790-830 ℃, the pass is 7-9, and the cumulative reduction rate is more than or equal to 60%;
(4) and (3) cooling: starting to cool at 770-820 ℃, at a cooling rate of 5-12 ℃ and at a temperature of 600-700 ℃ for re-reddening;
(5) tempering: tempering temperature is 420 +/-10 ℃, heat preservation time is 2.5 Xmin, and air cooling is carried out to normal temperature after tempering.
The heat preservation time of 2.5 multiplied by the wall thickness min in the step (5) means that the heat preservation time is calculated in minutes, and the wall thickness is calculated according to mm.
Compared with the prior art, the invention has the following advantages: the alloy cost is low in the chemical composition design, the process design characteristics are more beneficial to welding in bridge structure factories, and the unevenness of 6-50 mm steel plates can reach 3mm/1 m. The casting blank is hot-charged, so that the energy consumption for steel burning is reduced, and the yield ratio of the material is more favorably controlled; the steel plate adopts low-temperature tempering, so that the elongation and low-temperature impact toughness of the steel plate are improved while the rolling residual stress is eliminated; rolled steel plate Rt0.5: 480-520 MPa, tensile strength Rm: 650-690 MPa, yield ratio: 0.70 to 0.80; the elongation A is 23% -30%; -40 ℃ impact toughness: 180-300J, and the grain size reaches 12 grades.
Drawings
FIG. 1 is a photograph of the metallographic structure of a steel plate produced widely according to the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
The first embodiment is as follows: a production method of a 6mm low yield ratio Q420qE steel plate.
The chemical composition content of the steel is as follows: c =0.08%, Si =0.24%, Mn =1.56%, P =0.010%, S =0.001%, Alt =0.030%, Nb =0.015%, Ti =0.015%, Cr =0.18%, Mo =0.10%, Cu =0.17%, Pcm =0.19%, and the balance is Fe and unavoidable impurities.
The production process of the steel comprises the following steps and parameters:
(1) heating: the casting blank is directly loaded, and the charging temperature is as follows: 516 ℃, furnace temperature: 1140-1190 ℃, and the total time in the furnace: and (3) 140 min.
(2) Rough rolling: setting the intermediate billet to be 55mm, the initial rolling temperature to be 1150 ℃, the final rolling temperature to be 990 ℃, the pass number to be 7 and the accumulated reduction rate to be 69.5 percent.
(3) Finish rolling: the initial rolling temperature is 915 ℃, the final rolling temperature is 805-825 ℃, the pass is 7, and the cumulative reduction rate is 89.1%.
(4) And (3) cooling: the initial cooling temperature is 810-820 ℃, the cooling rate is 8-11 ℃, and the re-reddening temperature is 650-690 ℃.
(5) Tempering: tempering temperature 420 ℃, and holding time: and (5) tempering for 15min, and then air-cooling to normal temperature.
The results of the performance measurements are shown in Table 1.
Example two: a production method of a 20mm low yield ratio Q420qE steel plate.
The chemical composition content of the steel is as follows: c =0.07%, Si =0.26%, Mn =1.54%, P =0.010%, S =0.001%, Alt =0.032%, Nb =0.018%, Ti =0.016%, Cr =0.17%, Mo =0.11%, Cu =0.18%, Pcm =0.18%, and the balance of Fe and unavoidable impurities.
The production process of the steel comprises the following steps and parameters:
(1) heating: the casting blank is directly loaded, and the charging temperature is as follows: 532 ℃, furnace temperature: 1160-1188 ℃, total time in the furnace: and (3) 162 min.
(2) Rough rolling: the intermediate billet is set to be 80mm, the initial rolling temperature is 1172 ℃, the final rolling temperature is 992 ℃, the pass is 7, and the accumulated reduction rate is 69.2%.
(3) Finish rolling: the initial rolling temperature is 880 ℃, the final rolling temperature is 801-822 ℃, the pass is 7, and the cumulative reduction rate is 75%.
(4) And (3) cooling: the initial cooling temperature is 796-817 ℃, the cooling rate is 7-10 ℃, and the re-reddening temperature is 620-650 ℃.
(5) Tempering: tempering temperature 420 ℃, and holding time: and (5) tempering for 50min, and then air-cooling to normal temperature.
The results of the performance measurements are shown in Table 1.
Example three: a production method of a 50mm low yield ratio Q420qE steel plate.
The chemical composition content of the steel is as follows: c =0.08%, Si =0.29%, Mn =1.56%, P =0.010%, S =0.001%, Alt =0.040%, Nb =0.022%, Ti =0.015%, Cr =0.18%, Mo =0.10%, Cu =0.19%, Pcm =0.19%, and the balance is Fe and unavoidable impurities.
The production process of the steel comprises the following steps and parameters:
(1) heating: the casting blank is directly loaded, and the charging temperature is as follows: 572 ℃, furnace temperature: 1172-1188 ℃, total time in the furnace: 176 min.
(2) Rough rolling: 125mm of intermediate billet, 1176 ℃ of initial rolling temperature, 995 ℃ of final rolling temperature, 5 passes of pass and 51.9 percent of accumulated reduction rate.
(3) Finish rolling: the initial rolling temperature is 840 ℃, the final rolling temperature is 790-800 ℃, the pass is 9, and the cumulative reduction rate is 60%.
(4) And (3) cooling: the initial cooling temperature is 775-798 ℃, the cooling rate is 7-9 ℃, and the temperature of red return is 600-630 ℃.
(5) Tempering: tempering temperature 420 ℃, and holding time: and (4) tempering for 125min, and then air-cooling to normal temperature.
The results of the performance measurements are shown in Table 1.
Table 1 results of property measurements of steels of examples
Claims (1)
1. A production method of tempered low-yield-ratio bridge steel comprises the following process routes of molten iron pretreatment → a converter → refining → continuous casting → heating → rolling → cooling → tempering, and is characterized in that: the steel comprises the following chemical components, by percentage, 0.07% -0.09% of C, 0.20% -0.30% of Si, 1.52% -1.60% of Mn, 0.015% or less of P, 0.003% or less of S, 0.020% to 0.045% of Alt, 0.01% -0.030% of Nb, 0.012% -0.020% of Ti, 0.16% -0.20% of Cr, 0.08% -0.12% of Mo, 0.16% -0.20% of Cu, 0.22% or less of Pcm, and the balance of Fe and inevitable impurities; the method comprises the following key process steps:
(1) heating: the casting blank is directly installed, namely the hot casting blank pulled out by continuous casting does not need to be cooled by stacking, and is directly conveyed to a heating furnace through a conveying roller way, the feeding temperature is 420-650 ℃, the hearth temperature is 1100-1200 ℃, and the total time in the furnace is 120-180 min;
(2) rough rolling: setting the thickness of the intermediate blank to be more than or equal to 2.5 times of the thickness of a finished product, wherein the initial rolling temperature is 1120-1160 ℃, the final rolling temperature is more than or equal to 980 ℃, the pass is 5-9, and the cumulative reduction rate is more than or equal to 50%;
(3) finish rolling: the initial rolling temperature is 860-920 ℃, the final rolling temperature is 790-830 ℃, the pass is 7-9, and the cumulative reduction rate is more than or equal to 60%;
(4) and (3) cooling: starting to cool at 770-820 ℃, at a cooling rate of 5-12 ℃ and at a temperature of 600-700 ℃ for re-reddening;
(5) tempering: tempering temperature is 420 +/-10 ℃, heat preservation time is 2.5 multiplied by wall thickness min, and air cooling is carried out to normal temperature after tempering.
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| CN114182165A (en) * | 2021-10-29 | 2022-03-15 | 南京钢铁股份有限公司 | Low-yield-ratio high-toughness Q500qE bridge steel and production method thereof |
| CN114875299A (en) * | 2022-05-25 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of Q690 high-corrosion-resistance high-strength offshore structural steel |
| CN114875311A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 420 MPa-grade low-yield-ratio steel for ocean engineering and production method thereof |
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