CN112795840A - 690 MPa-grade steel plate and production method thereof - Google Patents
690 MPa-grade steel plate and production method thereof Download PDFInfo
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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
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- 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
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Abstract
The invention relates to a 690 MPa-grade steel plate which comprises the following chemical components in percentage by weight: c: 0.13-0.17%, Si is less than or equal to 0.50%, Mn: 0.70-1.00%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Ni: 0.50-0.60%, Cr: 0.90-1.10%, Mo: 0.20 to 0.40%, Nb: 0.020-0.035%, Ti: 0.010-0.030%, V: 0.020-0.045%, B: 0.0010-0.0020%, Al: 0.020 to 0.050%, Ceq: 0.60-0.66%, and the balance of Fe and other inevitable impurities. The steel plate has uniform and compact internal structure, good obdurability matching and excellent atmospheric corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of steel plate production, and particularly relates to a 690 MPa-grade steel plate and a production method thereof.
Background
With the rapid development of social technology, the consumption of various resources on the earth is rapidly increased by human beings, the development of ocean is more and more emphasized by various countries, the key equipment technology for developing ocean resources is also greatly developed by China, the steel for ultrahigh-strength ocean engineering is generally used for building large ocean steel structural members such as ocean platforms, oil drilling platforms, self-elevating ocean platform pile legs, wind power installation ships and the like, and with the deepening of a working sea area, ocean equipment needs to bear severe service environments such as ocean storm, ocean undercurrent, atmospheric erosion and the like, so that the steel for ultrahigh-strength ocean engineering has the advantages of high strength, high toughness, fatigue resistance, lamellar tearing resistance, good weldability and the like. The F-grade 690MPa large-thickness steel plate with impact energy requirement of-60 ℃ low-temperature toughness seriously depends on import at present, the development of the marine equipment manufacturing in China is severely restricted, and the development of the F-grade 690 MPa-grade large-thickness marine steel plate with yield strength has important significance for the development of the steel plate for the marine engineering in China.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 690 MPa-grade steel plate and a production method thereof, wherein the steel plate has high strength and low-temperature toughness, uniform internal structure and stable performance, and can be widely applied to various large ocean engineering structural steel parts.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the 690 MPa-grade steel plate is characterized by comprising the following chemical components in percentage by weight: c: 0.13-0.17%, Si is less than or equal to 0.50%, Mn: 0.70-1.00%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Ni: 0.50-0.60%, Cr: 0.90-1.10%, Mo: 0.20 to 0.40%, Nb: 0.020-0.035%, Ti: 0.010-0.030%, V: 0.020-0.045%, B: 0.0010-0.0020%, Al: 0.020-0.050%, and the balance of Fe and other inevitable impurities, wherein the carbon equivalent Ceq: 0.60-0.66%, and Ceq is Ceq = C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15.
The action and the proportion of each element are as follows:
c: 0.13-0.17%, and the carbon has obvious influence on various properties of the steel, particularly the strength, impact toughness and welding performance of the steel. The low carbon content can cause the low hardness and the low strength of the steel and can also increase the smelting control difficulty; too high carbon content will reduce the impact toughness of the steel, reduce weldability, etc.
Si: less than or equal to 0.50 percent, silicon is a main reducing agent and deoxidizer in the steelmaking process, the silicon can obviously improve the elastic limit, the yield point and the tensile strength of steel, but when the content of the silicon exceeds 0.50 percent, the toughness of the steel is reduced, and the welding performance of the steel is reduced, so the content of the silicon is controlled to be less than or equal to 0.50 percent.
Mn: 0.70-1.00%, low manganese cost, good deoxidizer and desulfurizer, and can increase toughness, strength and hardness of steel, improve hardenability of steel, and improve hot workability of steel; however, too high manganese content weakens the corrosion resistance of the steel, degrades the weldability, and causes severe segregation.
P is less than or equal to 0.010 percent, phosphorus is a harmful element in steel under the general condition, the cold brittleness of the steel is increased, the plasticity is reduced, the cold bending property is deteriorated, and the phosphorus content is reduced as much as possible under the condition of reasonable control cost.
S is less than or equal to 0.005 percent, sulfur is a harmful element in steel, the hot brittleness of the steel is increased, the ductility and the toughness of the steel are reduced, cracks are easy to generate during forging and rolling, and the content of the sulfur in the steel is reduced as much as possible under the economic benefit.
Ni: 0.50-0.60%, nickel can improve the strength of steel and can also enhance the plasticity and toughness of steel, but metal nickel belongs to scarce resources and has higher price, and the content of nickel is reduced as much as possible.
Cr: 0.90-1.10%, and chromium is an effective element for improving the weather resistance of the steel, so a certain amount of chromium is required to be added, chromium is a noble metal element, the toughness of the steel is affected and the welding performance of the steel is also deteriorated due to the fact that the content of chromium is too high, and the alloy cost is increased.
Mo: 0.20-0.40%, and the molybdenum greatly improves the strength, the plasticity and the low-temperature impact toughness, because Mo can make the C curve of the steel shift to the right when being dissolved in ferrite and austenite in a solid manner, thereby obviously improving the hardenability of the steel; and the molybdenum can obviously improve the recrystallization temperature of the steel, and the toughness of the steel can also be improved by adding a certain amount of molybdenum in the steel.
Nb: 0.020-0.035%, niobium can promote grain refinement of the steel microstructure, and simultaneously improve strength and toughness, niobium can effectively refine the microstructure by inhibiting austenite recrystallization in the controlled rolling process, and improves steel hardenability by precipitation strengthening, thereby reducing overheating sensitivity and temper brittleness of steel and improving welding performance.
V: 0.020-0.045%, vanadium is a good deoxidizer of steel, crystal grains can be refined in the steel, the strength and toughness of the steel are improved, and the hydrogen corrosion resistance of carbide formed by the vanadium and carbon can be improved at high temperature and high pressure.
Ti: 0.010-0.030%, titanium is a strong element forming carbon-nitrogen compound, the carbon-nitrogen compound has a high melting point, and has the function of inhibiting austenite grains from growing during heating, and in addition, the titanium can also refine the grains and improve the welding performance of the steel plate.
B: 0.0010-0.0020%, wherein boron is the most obvious element for improving the hardenability of the steel, the hardenability is unfavorable when the content is too high or too low, and the too high content of boron increases the welding crack sensitivity of the steel plate and reduces the weldability of the steel plate, so the content of boron is controlled to be 0.0010-0.0020%.
Al: 0.020-0.050%, aluminum is a common deoxidizer in steel, and a small amount of aluminum is added into the steel, so that grains can be refined, and the impact toughness is improved. Aluminum also has oxidation and corrosion resistance, and too high affects hot workability, weldability, and machinability of steel.
Furthermore, the yield strength of the steel plate is more than or equal to 690MPa, the tensile strength is 770-940 MPa, and the impact energy at the temperature of-60 ℃ in the V-shaped longitudinal direction is more than or equal to 100J.
The invention relates to a production method of a 690 MPa-grade steel plate, which comprises the working procedures of steel making, continuous casting, rolling and heat treatment and is characterized in that in the working procedure of steel making, molten steel is refined through a VD furnace, the VD furnace is used for refining, ferroboron is added before vacuum treatment, and part of aluminum particles are doped during adding.
Further, ferroboron is put into the molten steel near an argon blowing port of the VD furnace.
The VD furnace argon blowing port is a bottom argon blowing device of the VD furnace, ferroboron is added into the molten steel near the argon blowing port, and the ferroboron is favorably and quickly and uniformly dissolved in the molten steel.
Further, the steel-making process is that molten steel is refined in an LF furnace before being refined in a VD furnace, the refining process in the LF furnace ensures good argon blowing in the whole process, argon is added after alloy is added and the mixture is stirred for 3-5 min, ferrotitanium is added in the later refining stage, white slag is required to be kept for more than or equal to 20min, and after deoxidation, refining is controlled within 50min, and ladle lifting is finished.
Further, in the rolling procedure, the rolling temperature at the first stage is 1040-1100 ℃, and the reduction rate of each pass is 20-30%; the second stage is at the initial rolling temperature of 850-880 ℃ and the final rolling temperature of 800-820 ℃.
Further, in the rolling procedure, the continuous casting billet is heated in a continuous furnace, the heating temperature is less than or equal to 1250 ℃, and the total heating time is more than or equal to 10 min/mm.
Further, in the heat treatment process, the quenching temperature is 920-; the tempering temperature is 620 ℃ and 640 ℃, and the tempering heating time is 4.0-4.5 min/mm.
Further, in the heat treatment process, water cooling is carried out after quenching and heating, the water temperature is less than or equal to 30 ℃, and the roller speed is 1.8-2.2 m/min.
According to the production method of the 690 MPa-grade steel plate, the refining of the LF furnace and the vacuum treatment process of the VD furnace are controlled, so that the molten steel is well deoxidized, the generation of impurities in the molten steel is reduced, and the purity of the molten steel is improved; the steel plate has good comprehensive performance by adopting a controlled rolling process and a proper quenching and tempering heat treatment process.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the steel plate has uniform and compact internal structure, good obdurability matching and excellent atmospheric corrosion resistance, can be widely applied to the construction of large ocean steel structural members such as ocean platforms, oil drilling platforms, self-elevating ocean platform pile legs, wind power installation ships and the like, has wide application prospect, and has relatively low total noble metal element content, low cost and strong market competitiveness.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to better illustrate the invention, the following examples are given by way of further illustration.
Example 1
The chemical components and the weight percentage of the steel plate are shown in a table 1. The rolling specification of the steel plate is 75mm, and the production method comprises the following steps:
the production process comprises the working procedures of steel making, continuous casting, rolling and heat treatment, wherein molten steel in the steel making working procedure is refined in an LF furnace, the whole process of the refining in the LF furnace ensures good argon blowing, after alloy is added, argon is stirred for 3min, ferrotitanium is added in the later refining stage, white slag is kept for 22min, and after 30min of deoxidation, ladle lifting is finished after refining. And performing vacuum treatment in a VD furnace after LF refining, wherein in the VD furnace refining process, ferroboron is added near an argon blowing port of the VD furnace and is put into molten steel before the vacuum treatment, and part of aluminum particles are doped during the adding. Rolling, namely heating the continuous casting slab in a continuous furnace at 1250 ℃, wherein the total heating time is 10.5min/mm, the initial rolling temperature of the first stage is 1060 ℃, and the reduction rate of each pass is 26%; the second stage has the initial rolling temperature of 860 ℃ and the final rolling temperature of 820 ℃. A heat treatment process, wherein the quenching temperature is 932 ℃, the quenching heating time is 1.9 min/mm, water cooling is carried out after quenching heating, the water temperature is 28 ℃, and the roller speed is 1.8 m/min; the tempering temperature is 638 ℃, and the tempering heating time is 4.5 min/mm.
Example 2
The chemical components and the weight percentage of the steel plate are shown in a table 1. The rolling specification of the steel plate is 60mm, and the production method comprises the following steps:
the production process comprises the working procedures of steel making, continuous casting, rolling and heat treatment, wherein molten steel in the steel making working procedure is refined in an LF furnace, the whole process of the refining in the LF furnace ensures good argon blowing, after alloy is added, argon is stirred for 4min, ferrotitanium is added in the later refining stage, white slag is kept for 20min, and after deoxidation, ladle lifting is finished after refining for 50 min. And performing vacuum treatment in a VD furnace after LF refining, wherein in the VD furnace refining process, ferroboron is added near an argon blowing port of the VD furnace and is put into molten steel before the vacuum treatment, and part of aluminum particles are doped during the adding. A rolling procedure, namely heating the continuous casting billet in a continuous furnace at the heating temperature of 1247 ℃, wherein the total heating time is 10min/mm, the initial rolling temperature of 1100 ℃ at the first stage and the reduction rate of each pass is 30 percent; the second stage has the initial rolling temperature of 850 ℃ and the final rolling temperature of 800 ℃. A heat treatment process, wherein the quenching temperature is 940 ℃, the quenching heating time is 1.94 min/mm, water cooling is carried out after quenching heating, the water temperature is 30 ℃, and the roller speed is 1.9 m/min; the tempering temperature is 640 ℃, and the tempering heating time is 4.0 min/mm.
Example 3
The chemical components and the weight percentage of the steel plate are shown in a table 1. The rolling specification of the steel plate is 65mm, and the production method comprises the following steps:
the production process comprises the working procedures of steel making, continuous casting, rolling and heat treatment, wherein molten steel in the steel making working procedure is refined in an LF furnace, the whole process of the refining in the LF furnace ensures good argon blowing, after alloy is added, argon is stirred for 5min, ferrotitanium is added in the later refining stage, white slag is kept for 23min, and after deoxidation, ladle lifting is finished after 45min of refining. And performing vacuum treatment in a VD furnace after LF refining, wherein in the VD furnace refining process, ferroboron is added near an argon blowing port of the VD furnace and is put into molten steel before the vacuum treatment, and part of aluminum particles are doped during the adding. A rolling procedure, namely heating the continuous casting slab in a continuous furnace at the heating temperature of 1244 ℃, the total heating time of 11min/mm, the initial rolling temperature of 1040 ℃ at the first stage and the reduction rate of 20% per pass; the second stage is at the initial rolling temperature of 854 ℃ and the final rolling temperature of 810 ℃. A heat treatment process, wherein the quenching temperature is 930 ℃, the quenching heating time is 1.98 min/mm, water cooling is carried out after quenching heating, the water temperature is 29 ℃, and the roller speed is 2.0 m/min; the tempering temperature is 630 ℃, and the tempering heating time is 4.2 min/mm.
Example 4
The chemical components and the weight percentage of the steel plate are shown in a table 1. The rolling specification of the steel plate is 90mm, and the production method comprises the following steps:
the production process comprises the working procedures of steel making, continuous casting, rolling and heat treatment, wherein molten steel in the steel making working procedure is refined in an LF furnace, the whole process of the refining in the LF furnace ensures good argon blowing, after alloy is added, argon is stirred for 3.4min, ferrotitanium is added in the later refining stage, white slag is kept for 21min, and after deoxidation, ladle lifting is finished after refining for 40 min. And performing vacuum treatment in a VD furnace after LF refining, wherein in the VD furnace refining process, ferroboron is added near an argon blowing port of the VD furnace and is put into molten steel before the vacuum treatment, and part of aluminum particles are doped during the adding. A rolling procedure, namely heating the continuous casting slab in a continuous furnace at the heating temperature of 1239 ℃, wherein the total heating time is 11.2min/mm, the initial rolling temperature of 1085 ℃ at the first stage and the reduction rate of each pass is 22%; the start rolling temperature of the second stage is 865 ℃, and the finish rolling temperature is 817 ℃. A heat treatment process, wherein the quenching temperature is 935 ℃, the quenching and heating time is 2.03 min/mm, water cooling is carried out after quenching and heating, the water temperature is 27 ℃, and the roller speed is 2.1 m/min; the tempering temperature is 635 ℃, and the tempering heating time is 4.1 min/mm.
Example 5
The chemical components and the weight percentage of the steel plate are shown in a table 1. The rolling specification of the steel plate is 82mm, and the production method comprises the following steps:
the production process comprises the working procedures of steel making, continuous casting, rolling and heat treatment, wherein molten steel in the steel making working procedure is refined in an LF furnace, the whole process of the refining in the LF furnace ensures good argon blowing, after alloy is added, argon is stirred for 3.8min, ferrotitanium is added in the later refining stage, white slag is kept for 24min, and after deoxidation, ladle lifting is finished after refining for 44 min. And performing vacuum treatment in a VD furnace after LF refining, wherein in the VD furnace refining process, ferroboron is added near an argon blowing port of the VD furnace and is put into molten steel before the vacuum treatment, and part of aluminum particles are doped during the adding. A rolling procedure, namely heating the continuous casting slab in a continuous furnace at the heating temperature of 1232 ℃, wherein the total heating time is 10.2min/mm, the initial rolling temperature of a first stage is 1076 ℃, and the reduction rate of each pass is 24%; the second stage is at the initial rolling temperature of 880 ℃ and the final rolling temperature of 815 ℃. A heat treatment process, wherein the quenching temperature is 936 ℃, the quenching heating time is 2.07 min/mm, water cooling is carried out after quenching heating, the water temperature is 26 ℃, and the roller speed is 2.2 m/min; the tempering temperature is 632 ℃, and the tempering heating time is 4.3 min/mm.
Example 6
The chemical components and the weight percentage of the steel plate are shown in a table 1. The rolling specification of the steel plate is 80mm, and the production method comprises the following steps:
the production process comprises the working procedures of steel making, continuous casting, rolling and heat treatment, wherein molten steel in the steel making working procedure is refined in an LF furnace, the whole process of the refining in the LF furnace ensures good argon blowing, after alloy is added, argon is stirred for 4.6min, ferrotitanium is added in the later refining stage, white slag is kept for 25min, and after deoxidation, the ladle is refined after 35 min. And performing vacuum treatment in a VD furnace after LF refining, wherein in the VD furnace refining process, ferroboron is added near an argon blowing port of the VD furnace and is put into molten steel before the vacuum treatment, and part of aluminum particles are doped during the adding. A rolling procedure, namely heating the continuous casting slab in a continuous furnace at the heating temperature of 1228 ℃, the total heating time of 10.8min/mm, the initial rolling temperature of 1094 ℃ at the first stage and the reduction rate of each pass of 28%; the start rolling temperature of the second stage is 871 ℃, and the finish rolling temperature is 804 ℃. A heat treatment process, wherein the quenching temperature is 920 ℃, the quenching heating time is 2.1 min/mm, water cooling is carried out after quenching heating, the water temperature is 25 ℃, and the roller speed is 2.04 m/min; the tempering temperature is 620 ℃, and the tempering heating time is 4.4 min/mm.
TABLE 1
The mechanical properties of the steel plates of examples 1 to 6 were measured at 1/2 locations in the thickness direction and 1/4 locations in the thickness direction, and the test items were tensile strength, yield strength and longitudinal impact energy at-60 ℃, and the test results are shown in table 2.
TABLE 2
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (9)
1. The 690 MPa-grade steel plate is characterized by comprising the following chemical components in percentage by weight: c: 0.13-0.17%, Si is less than or equal to 0.50%, Mn: 0.70-1.00%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Ni: 0.50-0.60%, Cr: 0.90-1.10%, Mo: 0.20 to 0.40%, Nb: 0.020-0.035%, Ti: 0.010-0.030%, V: 0.020-0.045%, B: 0.0010-0.0020%, Al: 0.020-0.050%, and the balance of Fe and other inevitable impurities, wherein the carbon equivalent Ceq: 0.60-0.66%, and Ceq is Ceq = C + Mn/6+ (Cr + Mo + V)/5+ (Ni + Cu)/15.
2. The 690 MPa-grade steel plate according to claim 1, wherein the yield strength of the steel plate is not less than 690MPa, the tensile strength is 770-940 MPa, and the impact energy of the V-shaped steel plate at the longitudinal temperature of-60 ℃ is not less than 100J.
3. The method for producing the 690 MPa-grade steel plate according to any one of claims 1 or 2, which comprises steel making, continuous casting, rolling and heat treatment processes, wherein in the steel making process, molten steel is refined by a VD furnace, and in the VD furnace refining process, ferroboron is added before vacuum treatment, and part of aluminum particles are added during the adding process.
4. The method for producing a 690MPa grade steel plate according to claim 3, wherein ferroboron is put into the molten steel near an argon blowing port of the VD furnace.
5. The production method of the 690 MPa-grade steel plate according to claim 3, wherein molten steel in a steel making process is refined in an LF furnace before being refined in a VD furnace, the refining process in the LF furnace ensures that argon blowing is good in the whole process, argon is added after alloy is added and stirring is carried out for 3-5 min, ferrotitanium is added in the later stage of refining, white slag is required to be kept for more than or equal to 20min, and after deoxidation, refining is controlled within 50min, and ladle lifting is finished.
6. The method for producing the 690 MPa-grade steel plate according to claim 3, wherein in the rolling procedure, the rolling temperature in the first stage is 1040-1100 ℃, and the reduction rate of each pass is 20-30%; the second stage is at the initial rolling temperature of 850-880 ℃ and the final rolling temperature of 800-820 ℃.
7. The production method of the 690 MPa-grade steel plate according to claim 3, wherein in the rolling process, the continuous casting blank is heated in a continuous furnace, the heating temperature is less than or equal to 1250 ℃, and the total heating time is more than or equal to 10 min/mm.
8. The method for producing the 690 MPa-grade steel plate as claimed in claim 3, wherein the heat treatment process comprises the quenching temperature of 920-; the tempering temperature is 620 ℃ and 640 ℃, and the tempering heating time is 4.0-4.5 min/mm.
9. The method for producing the 690 MPa-grade steel plate according to claim 8, wherein the heat treatment process comprises water cooling after quenching and heating, the water temperature is less than or equal to 30 ℃, and the roller speed is 1.8-2.2 m/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113462972A (en) * | 2021-06-21 | 2021-10-01 | 山东钢铁股份有限公司 | Quenching and tempering high-strength low-temperature-resistant H-shaped steel for ocean engineering and preparation method thereof |
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| JPS56142826A (en) * | 1980-04-10 | 1981-11-07 | Sumitomo Metal Ind Ltd | Production of high-toughness high tensile steel plate |
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| CN103958715A (en) * | 2012-04-06 | 2014-07-30 | 新日铁住金株式会社 | High-strength thick steel plate having excellent arrestability |
| CN111455256A (en) * | 2020-04-17 | 2020-07-28 | 南京钢铁股份有限公司 | 690MPa easy-welding corrosion-resistant high-strength steel and manufacturing method thereof |
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| JPS56142826A (en) * | 1980-04-10 | 1981-11-07 | Sumitomo Metal Ind Ltd | Production of high-toughness high tensile steel plate |
| CN101250659A (en) * | 2008-04-08 | 2008-08-27 | 莱芜钢铁股份有限公司 | Method for improving and stabilising boron recovery rate for vacuum smelting steel containing boron |
| CN103958715A (en) * | 2012-04-06 | 2014-07-30 | 新日铁住金株式会社 | High-strength thick steel plate having excellent arrestability |
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| CN113462972A (en) * | 2021-06-21 | 2021-10-01 | 山东钢铁股份有限公司 | Quenching and tempering high-strength low-temperature-resistant H-shaped steel for ocean engineering and preparation method thereof |
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