CN113355606B - Alloy steel for ocean platform and machining process thereof - Google Patents
Alloy steel for ocean platform and machining process thereof Download PDFInfo
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- CN113355606B CN113355606B CN202110653586.1A CN202110653586A CN113355606B CN 113355606 B CN113355606 B CN 113355606B CN 202110653586 A CN202110653586 A CN 202110653586A CN 113355606 B CN113355606 B CN 113355606B
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C22C38/02—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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention provides alloy steel for an ocean platform and a processing technology thereof, belonging to the technical field of steel smelting. The alloy steel prepared by the invention comprises the following components in parts by weight: 0.05 to 0.1 percent of C, 0.20 to 0.35 percent of Si, 0.90 to 2.0 percent of Mn, 0.60 to 0.70 percent of Cr, 0.70 to 0.90 percent of Ni, 0.45 to 0.55 percent of Mo, 0.02 to 0.05 percent of Al, 0.005 to 0.015 percent of P, 0.005 to 0.01 percent of S and the balance of iron. The alloy steel prepared by adopting reasonable chemical components has high content of elements such as aluminum, chromium, molybdenum and the like, and has extremely low content of sulfur and phosphorus, so that the corrosion resistance, toughness and strength of the alloy steel for the ocean platform are greatly improved, and the comprehensive performance of the alloy steel in the full-thickness direction is improved.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to alloy steel for an ocean platform and a processing technology thereof.
Background
The ocean platform is a structure for drilling, oil production, transportation, observation, navigation, construction and other activities at sea to provide production and living facilities. With the development of ocean development and the increase of offshore oil production devices, coastal facilities and ocean buildings are continuously built. Accordingly, the variety and number of marine steels are increasing.
Seawater is a conductive medium consisting of various salts and is also the most corrosive medium in nature, so that the seawater has a strong corrosion effect on alloy steel. The corrosion of steel by seawater is mainly influenced by factors such as dissolved oxygen, salinity concentration, temperature, flow velocity, marine life, pH value, seawater pollution degree and the like.
Secondly, the alloy steel for the ocean platform is mainly used for offshore operation, and the alloy steel is required to be capable of normally operating at the wind speed of 45 knots and survive at the wind speed of 109 knots (super-strong typhoons above 18 grades). The ocean platform is not only subject to erosion and damage of natural forces such as sea waves, submarine earthquakes, low temperature and the like, but also needs to fully consider various severe sea conditions such as storms, sea waves, tides, glaciers and the like, and can resist typhoons which occur for 200 years, and the steel for the ocean platform is typical steel for ocean structures, so that the ocean platform has high requirements on strength, toughness, weldability, fracture toughness, fatigue performance and the like of alloy steel.
Disclosure of Invention
In view of the above, the invention provides alloy steel for an ocean platform, which has excellent corrosion resistance and strong impact toughness and can be used in ocean severe environment.
The invention aims to provide alloy steel for an ocean platform, which comprises the following components in parts by weight: 0.05 to 0.1 percent of C, 0.20 to 0.35 percent of Si, 0.90 to 2.0 percent of Mn, 0.60 to 0.70 percent of Cr, 0.70 to 0.90 percent of Ni, 0.45 to 0.55 percent of Mo, 0.02 to 0.05 percent of Al, 0.005 to 0.015 percent of P, 0.005 to 0.01 percent of S and the balance of iron.
The invention also aims to provide a heat treatment process of the alloy steel for the ocean platform, which comprises the following steps:
(1) desulfurizing the molten iron by applying a kr method desulfurization process to ensure that the sulfur content in the molten iron meets the standard;
(2) putting the desulfurized molten iron into a 120t converter for smelting, adding alloys such as Si, Mn, Cr, Ni, Mo, Al and the like, and finally putting the molten steel into a vacuum VD furnace for refining and degassing;
(3) sending the molten steel in the step (2) to a casting machine for continuous casting to obtain a 400 x 1900 casting blank;
(4) reheating the casting blank in the step (3), wherein the heating temperature is 1200-1250 ℃, the tapping temperature is 1140-1180 ℃, and then dephosphorization is carried out;
(5) carrying out rough rolling treatment on the dephosphorized casting blank in the step (4), wherein the reduction rate of at least 2 times is more than 20%, and the thickness of the intermediate blank is 1.3-1.5 times of that of the finished plate blank;
(6) performing finish rolling treatment on the casting blank after rough rolling in the step (5), wherein the thickness of a finished product is 80-120 mm;
(7) UFC ultra-fast cooling treatment is carried out on the finish-rolled steel billet, the final cooling temperature is 640-660 ℃, and when the surface temperature of the steel billet is 300-350 ℃, the steel billet is placed into a steam slow cooling box for heat preservation for 48-72 hours;
(8) carrying out heat treatment on the steel billet, wherein the heat treatment comprises two quenching and one tempering processes, the first quenching temperature is 930 ℃ below zero, the in-furnace time is 50-100min, the second quenching temperature is 900 ℃ below zero, and the in-furnace time is 50-100 min; the tempering temperature is 590-650 ℃, the steel plate is air-cooled to the room temperature after the tempering is finished, and the toughness of the alloy steel can be improved by adopting a twice quenching process.
Preferably, the temperature of the smelting in the step (2) is 1500-.
Preferably, the continuous casting process in the step (3) is to slowly reduce the temperature to room temperature to obtain a casting blank.
Preferably, the pressure for removing phosphorus in the step (4) is 18-25 MPa.
Preferably, the initial rolling temperature of the rough rolling in the step (5) is 1140-1180 ℃, and the final rolling temperature is 960-1000 ℃.
Preferably, the start rolling temperature of the finish rolling in the step (6) is 870-980 ℃, and the finish rolling temperature is 800-840 ℃.
Preferably, the tempering time in the step (8) is calculated by tempering the finished product with the thickness of each centimeter for 4-6 min.
Compared with the prior art, the invention has the following advantages:
the alloy steel prepared by adopting reasonable chemical components has high content of elements such as aluminum, chromium, molybdenum and the like, and has extremely low content of sulfur and phosphorus, so that the corrosion resistance, toughness and strength of the alloy steel for the ocean platform are greatly improved, and the comprehensive performance of the alloy steel in the full-thickness direction is improved.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
An alloy steel for ocean platforms, comprising the elements shown in table 1 and the balance of iron.
The processing technology of the alloy steel for the ocean platform comprises the following specific steps:
(1) carrying out desulfurization treatment on the molten iron by using a kr method desulfurization process to ensure that the sulfur content in the molten iron meets the standard;
(2) putting the desulfurized molten iron into a 120t converter for smelting, wherein the smelting temperature is 1520 ℃, then adding Si, Mn, Cr, Ni, Mo, Al and other alloys, and finally putting the molten steel into a vacuum VD furnace for refining and degassing;
(3) sending the molten steel in the step (2) to a casting machine, and slowly reducing the temperature to room temperature to obtain a 400 x 1900 casting blank;
(4) reheating the casting blank in the step (3), wherein the heating temperature is 1230 ℃, the tapping temperature is 1180 ℃, and then phosphorus removal is carried out, wherein the phosphorus removal pressure is 20 MPa;
(5) carrying out rough rolling treatment on the dephosphorized casting blank obtained in the step (4), wherein the initial rolling temperature is 1140 ℃, the final rolling temperature is 950 ℃, the reduction rate of 2 passes is more than 20%, and the thickness of the intermediate blank is 1.5 times that of the finished plate blank;
(6) performing finish rolling treatment on the casting blank after rough rolling in the step (5), wherein the initial rolling temperature is 870 ℃, the final rolling temperature is 800 ℃, and the thickness of a finished product is 80 mm;
(7) cooling the finish rolled steel billet, and preserving heat for 48 hours when the surface temperature of the steel billet is 350 ℃;
(8) carrying out heat treatment on the steel billet, wherein the heat treatment comprises two quenching processes and one tempering process, the first quenching temperature is 910 ℃, the quenching holding time is 60min, the second quenching temperature is 880 ℃, and the quenching holding time is 60 min; the tempering temperature is 600 ℃, the tempering time is 350min, and the steel plate is naturally cooled to the room temperature after the tempering.
Examples 2 to 4
According to the method of the embodiment 1, alloy steels for ocean platforms with different element contents and thicknesses are prepared, wherein the element contents except iron in the alloy steels of the embodiments 1-4 and the thicknesses of finished products are shown in the table 1:
TABLE 1
The alloy steels for ocean platforms prepared in examples 1 to 4 were subjected to performance tests, and the samples were subjected to corrosion resistance tests (counting the number of inclusion pitting sources in the worst visual field) according to the method in patent CN109187322B, and the results are shown in table 2:
TABLE 2
| Yield strength/MPa | Tensile strength/MPa | Longitudinal impact at-40 ℃ J | Sources of pitting corrosion of inclusions | |
| Example 1 | 1008 | 1042 | 250 | 1 piece/mm2 |
| Example 2 | 1002 | 1045 | 242 | 2 pieces/mm2 |
| Example 3 | 1015 | 1033 | 239 | 2 pieces/mm2 |
| Example 4 | 1026 | 1052 | 248 | 1 piece/mm2 |
As can be seen from Table 2, the alloy steel of the present invention has high mechanical properties, and at the same time, has strong corrosion resistance, and is suitable for ocean platform applications.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The alloy steel for the ocean platform is characterized by comprising the following components in parts by weight: 0.05-0.1% of C, 0.20-0.35% of Si, 0.90-2.0% of Mn, 0.60-0.70% of Cr, 0.70-0.90% of Ni, 0.45-0.55% of Mo, 0.02-0.05% of Al, 0.005-0.015% of P, 0.005-0.01% of S and the balance of Fe;
the machining process of the alloy steel for the ocean platform is characterized by comprising the following steps of:
(1) carrying out desulfurization treatment on the molten iron by using a kr method desulfurization process to ensure that the sulfur content in the molten iron meets the standard;
(2) putting the desulfurized molten iron into a 120t converter for smelting, adding Si, Mn, Cr, Ni, Mo and Al alloys, and finally putting the molten steel into a vacuum VD furnace for refining and degassing;
(3) sending the molten steel in the step (2) to a casting machine for continuous casting to obtain a 400-1900 casting blank;
(4) reheating the casting blank in the step (3), wherein the heating temperature is 1200-1250 ℃, the tapping temperature is 1140-1180 ℃, and then dephosphorization is carried out;
(5) carrying out rough rolling treatment on the dephosphorized casting blank in the step (4), wherein the reduction rate of at least 2 times is more than 20%, and the thickness of the intermediate blank is 1.3-1.5 times of that of the finished plate blank;
(6) performing finish rolling treatment on the casting blank after rough rolling in the step (5), wherein the thickness of a finished product is 80-120 mm;
(7) UFC ultra-fast cooling treatment is carried out on the finish-rolled steel billet, the final cooling temperature is 640-660 ℃, and when the surface temperature of the steel billet is 300-350 ℃, the steel billet is placed into a steam slow cooling box for heat preservation for 48-72 hours;
(8) carrying out heat treatment on the steel billet, wherein the heat treatment comprises two quenching and one tempering processes, the first quenching temperature is 930 ℃ below zero, the in-furnace time is 50-100min, the second quenching temperature is 900 ℃ below zero, and the in-furnace time is 50-100 min; the tempering temperature is 590-650 ℃, and the steel plate is air-cooled to the room temperature after the tempering is finished.
2. The alloy steel for ocean platforms as set forth in claim 1, wherein the temperature of the smelting in the step (2) is 1500-.
3. The alloy steel for the ocean platform as set forth in claim 1, wherein the continuous casting process in the step (3) is to slowly reduce the temperature to room temperature to obtain a cast slab.
4. The alloy steel for the offshore platform according to claim 1, wherein the pressure for removing phosphorus in the step (4) is 18-25 MPa.
5. The alloy steel for the ocean platform as claimed in claim 1, wherein the rough rolling in step (5) has a start rolling temperature of 1140-1180 ℃ and a finish rolling temperature of 960-1000 ℃.
6. The alloy steel for the ocean platform as claimed in claim 1, wherein the finish rolling in step (6) has a start rolling temperature of 870-980 ℃ and a finish rolling temperature of 800-840 ℃.
7. Alloy steel for offshore platforms, according to claim 1, characterized by the fact that the tempering time of step (8) is calculated as 4-6min of tempering per cm thickness of finished product.
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Citations (2)
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| CN102321847A (en) * | 2011-10-20 | 2012-01-18 | 南京钢铁股份有限公司 | Quenching and tempering structure thick steel plate for offshore platform and production method for quenching and tempering structure thick steel plate |
| CN111471937A (en) * | 2020-05-11 | 2020-07-31 | 河北普阳钢铁有限公司 | Low-cost chromium-containing Q460MC steel plate and production method thereof |
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| JP4673343B2 (en) * | 2007-06-06 | 2011-04-20 | 日本冶金工業株式会社 | Stainless steel sheet excellent in corrosion resistance, weldability and surface properties and method for producing the same |
| JP5233867B2 (en) * | 2009-06-22 | 2013-07-10 | 新日鐵住金株式会社 | High strength steel and offshore structures with excellent corrosion resistance and weld toughness |
| CN102925818B (en) * | 2012-11-23 | 2014-07-09 | 常州东大中天钢铁研究院有限公司 | Corrosion-resistant and high-temperature resistant bearing steel and production process thereof |
| CN103114254A (en) * | 2013-03-15 | 2013-05-22 | 济钢集团有限公司 | High-toughness steel plate for mechanical module supporting member of nuclear power plant and manufacturing method of steel plate |
| CN104975216B (en) * | 2015-06-30 | 2017-07-28 | 共享铸钢有限公司 | A kind of production method of C460 steel-castings |
| CN105463170B (en) * | 2015-11-12 | 2017-10-13 | 内蒙古包钢钢联股份有限公司 | The production method of 36Kg grades of offshore platform steel plates |
| CN105925897B (en) * | 2016-07-05 | 2018-02-13 | 南阳汉冶特钢有限公司 | A kind of 10 80mm large-scale hydroelectric projects high intensity Low Crack Sensitivity Steel SX780CF and preparation method thereof |
| CN110284056B (en) * | 2019-06-17 | 2021-02-09 | 南阳汉冶特钢有限公司 | Corrosion-resistant steel plate for ocean platform and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102321847A (en) * | 2011-10-20 | 2012-01-18 | 南京钢铁股份有限公司 | Quenching and tempering structure thick steel plate for offshore platform and production method for quenching and tempering structure thick steel plate |
| CN111471937A (en) * | 2020-05-11 | 2020-07-31 | 河北普阳钢铁有限公司 | Low-cost chromium-containing Q460MC steel plate and production method thereof |
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