CN109234643B - Rolling method of ultrahigh-strength rack steel for ocean platform - Google Patents
Rolling method of ultrahigh-strength rack steel for ocean platform Download PDFInfo
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- CN109234643B CN109234643B CN201811183486.1A CN201811183486A CN109234643B CN 109234643 B CN109234643 B CN 109234643B CN 201811183486 A CN201811183486 A CN 201811183486A CN 109234643 B CN109234643 B CN 109234643B
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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
- 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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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Abstract
The invention relates to a rolling method of an ultrahigh-strength rack steel for an ocean platform, which comprises the following chemical components in percentage by weight: 0.14 to 0.21 percent of C, 0.15 to 0.35 percent of Si, 0.95 to 1.30 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 1.00 to 1.50 percent of Cr, 1.50 to 2.00 percent of Ni, 0.40 to 0.60 percent of Mo, 0.03 to 0.08 percent of V, less than or equal to 0.15 percent of Cu, 0.020 to 0.040 percent of Nb, and the balance of Fe and inevitable impurities; the thickness of the steel plate of the ultrahigh-strength rack steel is 150-210 mm; the yield strength is more than or equal to 500 MPa; the rolling process comprises heating, dephosphorization, rolling, slow cooling and flaw detection; according to the invention, through the improvement of the process, the aim of producing the 150-210 mm ultrahigh-strength rack steel by using the existing equipment is achieved, the product quality is stable, and the user requirements can be met.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a rolling method of ultrahigh-strength rack steel for an ocean platform.
Background
With the development of marine oil and gas development from shallow water areas to deep water areas and from conventional mild environments to extremely cold environments, the continuous upgrading and updating of marine oil platforms are promoted; high strength is always the development direction of marine steel, on one hand, the steel for ocean platforms tends to use higher strength steel due to the aspects of strength, cost saving and the like; on the other hand, the strength of the steel is improved, and the bearing capacity and the operation capacity of the platform can be improved.
For rack steel with the thickness of more than 150mm, the quality of products in China at present has a certain gap compared with that in foreign countries, and a large part of the products need to be imported from foreign countries. Therefore, the development of the ultrahigh-strength rack steel with the finished product thickness of more than 150mm to replace imported products becomes an important research and development target of domestic steel enterprises.
Disclosure of Invention
The invention provides a rolling method of an ultrahigh-strength rack steel for an ocean platform, which realizes the aim of producing the ultrahigh-strength rack steel with the thickness of 150-210 mm by using the existing equipment through the improvement of the technological process, has stable product quality and can meet the requirements of users.
In order to achieve the purpose, the invention adopts the following technical scheme:
the rolling method of the ultrahigh-strength rack steel for the ocean platform comprises the following chemical components in percentage by weight: 0.14 to 0.21 percent of C, 0.15 to 0.35 percent of Si, 0.95 to 1.30 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 1.00 to 1.50 percent of Cr, 1.50 to 2.00 percent of Ni, 0.40 to 0.60 percent of Mo, 0.03 to 0.08 percent of V, less than or equal to 0.15 percent of Cu, 0.020 to 0.040 percent of Nb, and the balance of Fe and inevitable impurities; the thickness of the steel plate of the ultrahigh-strength rack steel is 150-210 mm; the yield strength is more than or equal to 500 MPa;
the rolling process of the ultrahigh-strength rack steel is as follows:
1) a heating process;
iron sheets are wrapped on the outer sides of the upper surface and the lower surface of the billet steel before the billet steel enters the furnace, the temperature of the billet steel is kept for 9-10 h at 700 ℃, the temperature of the billet steel is raised for 7-8 h at 700-1240 ℃, and the billet steel is soaked for 6-7 h at 1200 ℃; the total time in the furnace is more than 25 h;
2) a dephosphorization process;
after the steel billet is discharged from the furnace, a high-pressure water system of a roughing mill is utilized, and phosphorus is removed by adopting a first-pass air passing and high-pressure water spraying mode; if the steel billet is not completely removed once, repeating the process of emptying and spraying high-pressure water to remove scale once again, and ensuring that the surface of the steel billet is completely removed; but the descaling frequency is not more than 2 times so as to ensure that the initial rolling temperature is more than or equal to 1100 ℃;
3) a rolling process;
rolling at high temperature, low speed and large reduction; the single frame of the roughing mill directly carries out longitudinal rolling, the roller speed is 1.2-1.5 m/s, and the pressure value is more than or equal to 3000 kN.m; before rolling, the lower water spray between the roller ways is opened, if the head and the tail of the steel plate are upwarped in the rolling process, the steel plate is moved to the lower water spray position for cooling, or the correction is carried out by utilizing the speed difference of the upper roller and the lower roller and the rolling mode under large pressure;
4) slow cooling process;
and (3) placing the rolled steel plate into a slow cooling pit for slow cooling, wherein the slow cooling starting temperature is more than or equal to 300 ℃, and the slow cooling time is more than or equal to 48 hours.
The ultrahigh-strength rack steel comprises the following chemical components in percentage by weight: 0.15 to 0.20 percent of C, 0.25 to 0.30 percent of Si, 1.00 to 1.10 percent of Mn, less than or equal to 0.005 percent of P, less than or equal to 0.005 percent of S, 1.20 to 1.30 percent of Cr, 1.30 to 1.40 percent of Nis, 0.40 to 0.50 percent of Mo, 0.03 to 0.05 percent of V, less than or equal to 0.15 percent of Cu, 0.020 to 0.040 percent of Nb, and the balance of Fe and inevitable impurities.
Compared with the prior art, the invention has the beneficial effects that:
through the improvement of the technological process, the aim of producing 150-210 mm ultrahigh-strength rack steel by using the existing equipment is achieved, the product quality is stable, and the user requirements can be met.
Detailed Description
The invention relates to a rolling method of an ultrahigh-strength rack steel for an ocean platform, which comprises the following chemical components in percentage by weight: 0.14 to 0.21 percent of C, 0.15 to 0.35 percent of Si, 0.95 to 1.30 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 1.00 to 1.50 percent of Cr, 1.50 to 2.00 percent of Ni, 0.40 to 0.60 percent of Mo, 0.03 to 0.08 percent of V, less than or equal to 0.15 percent of Cu, 0.020 to 0.040 percent of Nb, and the balance of Fe and inevitable impurities; the thickness of the steel plate of the ultrahigh-strength rack steel is 150-210 mm; the yield strength is more than or equal to 500 MPa;
the rolling process of the ultrahigh-strength rack steel is as follows:
1) a heating process;
iron sheets are wrapped on the outer sides of the upper surface and the lower surface of the billet steel before the billet steel enters the furnace, the temperature of the billet steel is kept for 9-10 h at 700 ℃, the temperature of the billet steel is raised for 7-8 h at 700-1240 ℃, and the billet steel is soaked for 6-7 h at 1200 ℃; the total time in the furnace is more than 25 h;
2) a dephosphorization process;
after the steel billet is discharged from the furnace, a high-pressure water system of a roughing mill is utilized, and phosphorus is removed by adopting a first-pass air passing and high-pressure water spraying mode; if the steel billet is not completely removed once, repeating the process of emptying and spraying high-pressure water to remove scale once again, and ensuring that the surface of the steel billet is completely removed; but the descaling frequency is not more than 2 times so as to ensure that the initial rolling temperature is more than or equal to 1100 ℃;
3) a rolling process;
rolling at high temperature, low speed and large reduction; the single frame of the roughing mill directly carries out longitudinal rolling, the roller speed is 1.2-1.5 m/s, and the pressure value is more than or equal to 3000 kN.m; before rolling, the lower water spray between the roller ways is opened, if the head and the tail of the steel plate are upwarped in the rolling process, the steel plate is moved to the lower water spray position for cooling, or the correction is carried out by utilizing the speed difference of the upper roller and the lower roller and the rolling mode under large pressure;
4) slow cooling process;
and (3) placing the rolled steel plate into a slow cooling pit for slow cooling, wherein the slow cooling starting temperature is more than or equal to 300 ℃, and the slow cooling time is more than or equal to 48 hours.
The ultrahigh-strength rack steel comprises the following chemical components in percentage by weight: 0.15 to 0.20 percent of C, 0.25 to 0.30 percent of Si, 1.00 to 1.10 percent of Mn, less than or equal to 0.005 percent of P, less than or equal to 0.005 percent of S, 1.20 to 1.30 percent of Cr, 1.30 to 1.40 percent of Nis, 0.40 to 0.50 percent of Mo, 0.03 to 0.05 percent of V, less than or equal to 0.15 percent of Cu, 0.020 to 0.040 percent of Nb, and the balance of Fe and inevitable impurities.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In this embodiment, the chemical components of the ultra-high strength rack steel are, by weight: 0.16% of C, 0.18% of Si, 1.15% of Mn, 0.03% of P, 0.024% of S, 1.15% of Cr, 1.56% of Ni, 0.52% of Mo, 0.033% of V, 0.072% of Cu, 0.029% of Nb and the balance of Fe and inevitable impurities;
the rolling process of the ultrahigh-strength rack steel is as follows:
1) a heating process;
iron sheets are wrapped on the outer sides of the upper surface and the lower surface of the billet steel before the billet steel enters the furnace, the temperature of the billet steel is kept for 9 hours at 700 ℃, the temperature of the billet steel is raised to 700-1240 ℃ for 8 hours, and the billet steel is soaked for 6 hours at 1200 ℃; the total time in the furnace is 25 h;
2) a dephosphorization process;
after the steel billet is discharged from the furnace, a high-pressure water system of a roughing mill is utilized, and phosphorus is removed by adopting a first-pass air passing and high-pressure water spraying mode; the initial rolling temperature is 1150 ℃;
3) a rolling process;
rolling at high temperature, low speed and large reduction; the single frame of the roughing mill directly carries out longitudinal rolling, the roller speed is 1.3m/s, and the torque is 3500 kN.m; before rolling, the lower water spray between the roller ways is opened, if the head and the tail of the steel plate are upwarped in the rolling process, the steel plate is moved to the lower water spray position for cooling, or the correction is carried out by utilizing the speed difference of the upper roller and the lower roller and the rolling mode under large pressure;
4) slow cooling process
And (3) putting the rolled steel plate into a slow cooling pit for slow cooling, wherein the slow cooling starting temperature is 350 ℃, and the slow cooling time is 50 h.
The steel plates were tested according to ASTM grade A578/A578M C.
The thickness of the rolled steel plate in the embodiment is 210 mm; yield strength 566 MPa.
[ example 2 ]
In this embodiment, the chemical components of the ultra-high strength rack steel are, by weight: 0.18% of C, 0.28% of Si, 1.20% of Mn, 0.01% of P, 0.01% of S, 1.25% of Cr, 1.35% of Ni, 0.45% of Mo, 0.04% of V, 0.09% of Cu, 0.035% of Nb and the balance of Fe and inevitable impurities;
the rolling process of the ultrahigh-strength rack steel is as follows:
1) a heating process;
iron sheets are wrapped on the outer sides of the upper surface and the lower surface of the billet steel before the billet steel enters the furnace, the temperature of the furnace is kept for 9.5 hours at 700 ℃, the temperature is raised for 7.5 hours at 700-1240 ℃, and the temperature is uniformly heated for 6.5 hours at 1200 ℃; the total time in the furnace is 27 h;
2) a dephosphorization process;
after the steel billet is discharged from the furnace, a high-pressure water system of a roughing mill is utilized, and phosphorus is removed by adopting a first-pass air passing and high-pressure water spraying mode; the initial rolling temperature is 1200 ℃;
3) a rolling process;
rolling at high temperature, low speed and large reduction; the single frame of the roughing mill directly carries out longitudinal rolling, the roll speed is 1.4m/s, and the torque is 3300 kN.m; before rolling, the lower water spray between the roller ways is opened, if the head and the tail of the steel plate are upwarped in the rolling process, the steel plate is moved to the lower water spray position for cooling, or the correction is carried out by utilizing the speed difference of the upper roller and the lower roller and the rolling mode under large pressure;
4) slow cooling process
And (3) putting the rolled steel plate into a slow cooling pit for slow cooling, wherein the slow cooling starting temperature is 400 ℃, and the slow cooling time is 48 h.
The steel plates were tested according to ASTM grade A578/A578M C.
The thickness of the rolled steel plate in the embodiment is 180 mm; yield strength 543 MPa.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. The rolling method of the ultrahigh-strength rack steel for the ocean platform is characterized in that the ultrahigh-strength rack steel comprises the following chemical components in percentage by weight: 0.14 to 0.21 percent of C, 0.15 to 0.35 percent of Si, 0.95 to 1.30 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 1.00 to 1.50 percent of Cr, 1.30 to 1.40 percent or 1.50 to 2.00 percent of Ni, 0.40 to 0.60 percent of Mo0.03 to 0.08 percent of V, less than or equal to 0.15 percent of Cu, 0.020 to 0.040 percent of Nb, and the balance of Fe and inevitable impurities; the thickness of the steel plate of the ultrahigh-strength rack steel is 150-210 mm; the yield strength is more than or equal to 500 MPa;
the rolling process of the ultrahigh-strength rack steel is as follows:
1) a heating process;
iron sheets are wrapped on the outer sides of the upper surface and the lower surface of the billet steel before the billet steel enters the furnace, the temperature of the billet steel is kept for 9-10 h at 700 ℃, the temperature of the billet steel is raised for 7-8 h at 700-1240 ℃, and the billet steel is soaked for 6-7 h at 1200 ℃; the total time in the furnace is more than 25 h;
2) a dephosphorization process;
after the steel billet is discharged from the furnace, a high-pressure water system of a roughing mill is utilized, and phosphorus is removed by adopting a first-pass air passing and high-pressure water spraying mode; if the steel billet is not completely removed once, repeating the process of emptying and spraying high-pressure water to remove scale once again, and ensuring that the surface of the steel billet is completely removed; but the descaling frequency is not more than 2 times so as to ensure that the initial rolling temperature is more than or equal to 1100 ℃;
3) a rolling process;
rolling at high temperature, low speed and large reduction; the single frame of the roughing mill directly carries out longitudinal rolling, the roll speed is 1.2-1.5 m/s, and the torque is more than or equal to 3000 kN.m; before rolling, the lower water spray between the roller ways is opened, if the head and the tail of the steel plate are upwarped in the rolling process, the steel plate is moved to the lower water spray position for cooling, or the correction is carried out by utilizing the speed difference of the upper roller and the lower roller and the rolling mode under large pressure;
4) slow cooling process;
and (3) placing the rolled steel plate into a slow cooling pit for slow cooling, wherein the slow cooling starting temperature is more than or equal to 300 ℃, and the slow cooling time is more than or equal to 48 hours.
2. The rolling method of the ultrahigh-strength rack steel for the ocean platform according to claim 1, wherein the ultrahigh-strength rack steel comprises the following chemical components in percentage by weight: 0.15 to 0.20 percent of C, 0.25 to 0.30 percent of Si, 1.00 to 1.10 percent of Mn, less than or equal to 0.005 percent of P, less than or equal to 0.005 percent of S, 1.20 to 1.30 percent of Cr, 1.30 to 1.40 percent of Ni, 0.40 to 0.50 percent of Mo, 0.03 to 0.05 percent of V, less than or equal to 0.15 percent of Cu, 0.020 to 0.040 percent of Nb, and the balance of Fe and inevitable impurities.
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| JP4314448B2 (en) * | 1999-06-11 | 2009-08-19 | 住友金属工業株式会社 | Tempered high strength steel and continuous cast slab for the steel |
| CN102312174B (en) * | 2010-06-29 | 2013-07-31 | 鞍钢股份有限公司 | Non-tempered high-strength wear-resisting steel and production method thereof |
| CN102676953A (en) * | 2012-06-13 | 2012-09-19 | 鞍钢股份有限公司 | 47kg grade steel plate used on ocean engineering platform and production method thereof |
| CN104073732A (en) * | 2013-03-27 | 2014-10-01 | 鞍钢股份有限公司 | Economical hydroelectric thick plate with excellent weldability and production method thereof |
| CN103305768A (en) * | 2013-06-20 | 2013-09-18 | 舞阳钢铁有限责任公司 | Steel for low-carbon equivalent seawater corrosion resisting ocean platform rack and production method of steel |
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