CN114107800A - Longitudinal variable-thickness steel plate for upper deck of crude oil cargo oil tank and production method - Google Patents
Longitudinal variable-thickness steel plate for upper deck of crude oil cargo oil tank and production method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 154
- 239000010959 steel Substances 0.000 title claims abstract description 154
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- 239000003921 oil Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000000126 substance Substances 0.000 claims abstract description 11
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- 238000005096 rolling process Methods 0.000 claims description 27
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- 238000005266 casting Methods 0.000 claims description 14
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- 238000000034 method Methods 0.000 claims description 9
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- 238000005728 strengthening Methods 0.000 description 5
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- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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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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- 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
- C22C38/42—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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- 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
- C22C38/18—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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- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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Abstract
The invention relates to a longitudinal variable thickness steel plate for an upper deck of a crude oil cargo oil tank, which is characterized by comprising the following chemical components: 0.020-0.080% of C, 0.10-0.50% of Si, 0.90-1.50% of Mn, 0.015-0.045% of Nb, 0.020-0.060% of V, 0.005-0.018% of Ti, 0.18-0.34% of Cu, 0.10-0.33% of Ni, 0.08-0.19% of Cr, 0.15-0.25% of Sn, 0.06-0.20% of Sb, 0.0120-0.0160% of N, 0.008-0.015% of P, less than or equal to 0.005% of S, 0.015-0.030% of Als, and the balance of Fe and inevitable impurities. The steel plate has excellent mechanical property and corrosion resistance.
Description
Technical Field
The invention relates to the technical field of metal material production, in particular to a longitudinal variable-thickness steel plate for an upper deck of a crude oil cargo oil tank and a production method thereof.
Background
In recent years, the crude oil consumption and import of China are rising year by year and are the second largest petroleum consumption country in the world, and the crude oil in China has high external dependence degree which is more than 65%, so the crude oil transportation safety is vital to the energy strategy in China, more than 90% of the imported crude oil is transported by large oil tankers (VLCC), and the crude oil contains H, for example2S、Cl-And the corrosive media can corrode oil tankers, oil storage tanks and the like, which is the biggest potential safety hazard in the process of crude oil storage and transportation.Aiming at the problem of the operational safety of the oil tanker, the international maritime affairs association (IMO) has increasingly strict requirements on corrosion resistance of the cargo oil tank of the offshore crude oil tanker, the standard of the protective coating is improved, and meanwhile, corrosion-resistant steel is provided as a substitute measure for further improving the corrosion resistance. The corrosion-resistant steel replaces a protective coating, has the remarkable advantages of economy, environmental protection and energy conservation, and is a great hotspot of the current research.
The longitudinal variable thickness (LP) steel plate is a steel plate having a thickness varying in a length direction, and the longitudinal thickness thereof is varied by continuously changing an opening degree of a roll during rolling, and may be divided into 10 different shapes according to a thickness variation manner. The LP steel plate has unique advantages in optimizing the design of structural sections of ship hulls and the like because the thickness of the LP steel plate can be changed according to the load bearing condition. Depending on the design, LP steel plates of at least 8 shapes may be used in the hull structure. The use of LP steel plates has been increasing in recent years as the demand for lighter ships has increased, not only to reduce the amount of steel used and the number of welding operations, but also to improve the workability of joints by making the joints thicker, such as omitting the backing plate and taper work. Therefore, the LP steel plate is a reduced and economical steel plate, and is favored by manufacturers and users at home and abroad.
At present, corrosion-resistant steel and LP steel plates have been used, but the production and use of longitudinally variable thickness ship plates having corrosion resistance properties have not been reported. The name is "a corrosion-resistant steel for cargo oil tank bottom plate of crude oil carrier", application number: 201210562247.3 discloses a corrosion-resistant steel for cargo oil tank bottom plate of crude oil tanker, which comprises the following chemical components: 0.04-0.12% of C, 0.10-0.50% of Si, 0.70-1.60% of Mn, 0.003-0.03% of P, less than 0.005% of S, 0.10-0.50% of Ni, 0.10-0.50% of Cu, 0.005-0.05% of Nb, 0.005-0.05% of Ti, 0.01-0.05% of Al, 0.001-0.003% of Ca, 0.05-0.12% of Sn and 0.02-0.15% of Mo, wherein Sn and Mo are main corrosion-resistant elements, and the corrosion-resistant steel plate is obtained through processes such as smelting-rolling and the like, and has good corrosion resistance, but the strength and toughness of the steel plate are slightly poor, the strength is only 36Kg grade, the toughness is only-20 ℃, the use requirement is far from being met, and the shape of the steel plate is an equal thickness steel plate. The name is 'a corrosion-resistant steel plate of a base plate of a cargo oil tank of a crude oil tanker and a manufacturing method thereof', application numbers are as follows: 201611077373.4, discloses a corrosion-resistant steel plate for a bottom plate of a crude oil cargo tank, which comprises the following chemical components: 0.015-0.085% of C, 0.10-0.50% of Si, 0.05-2.5% of Mn, 0.003-0.030% of P, less than or equal to 0.008% of S, 0.005-0.30% of Cr, 0.005-0.5% of Mo, 0.005-0.50% of Cu, 0.005-0.50% of Ni and 0.01-0.12% of Al. The corrosion-resistant steel plate is obtained by adopting processes such as high pressure and the like, the yield strength of the steel plate is more than or equal to 235MPa, the tensile strength of the steel plate is 400-660 MPa, and the impact energy at minus 60 ℃ is more than or equal to 120J. However, the steel of this patent contains a high Mn content of at most 2.5%, and inevitably suffers from core segregation, which affects the properties of the steel sheet, and is also a steel sheet of an equal thickness. The name is 'manufacturing method of corrosion-resistant steel plate for upper deck of cargo oil tank of crude oil tanker and steel plate', application number: 201310235149.3, discloses a corrosion-resistant steel plate for the upper deck of a crude oil cargo tank, which comprises the following chemical components: 0.02-0.25% of C, 0.05-0.5% of Si, 0.1-2.0% of Mn, less than or equal to 0.025% of P, less than or equal to 0.01% of S, 0.05-0.20% of Cu, 0.05-2% of Ni, 0.01-5% of Cr, 0.001-1% of W, 0.001-0.1% of Zr, 0.0002-0.01% of Ca, 0.005-0.1% of Ti, 0.001-0.008% of N and 0.020-0.1% of Als. The corrosion-resistant steel plate is obtained by adopting technological means such as high pressure, TMCP and the like, the yield strength of the steel plate is 430MPa, the tensile strength is 506MPa, but the content of each element is higher, the production cost of the steel plate is increased, the content of C is up to 0.25%, the corrosion resistance of the steel plate is greatly reduced, and the steel plate is also the steel plate with the same thickness. The name is 'wedge-shaped weather-proof bridge steel with uniform thin and thick end performance and production method thereof', application number: 201811329589.4 discloses a wedge-shaped atmospheric corrosion resistant steel plate, which comprises the following chemical components: 0.07-0.09% of C, 0.15-0.35% of Si, 1.15-1.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.3-0.42% of Cu, 0.3-0.48% of Ni, 0.06-0.10% of Mo, 0.38-0.52% of Cr, 0.06-0.08% of Nb, 0.01-0.03% of V and 0.012-0.025% of Ti. The strength grade of the steel plate is 355-395 MPa, the transverse elongation is more than or equal to 23%, the average value of longitudinal impact energy at minus 20 ℃ is more than or equal to 150J, and the steel plate is strong and low in toughness. However, this patent contains a high Nb content, resulting in an increase in the cost of the steel sheet. The name is 345 MPa-level LP steel plate and a production method thereof, and the application number is as follows: 201710068867.4, "LP steel plate of 390MPa grade and its production method", application number: 201710068896.0, "a 420MPa LP steel plate and its production method" application number: 201710068882.9, which discloses a wedge-shaped steel plate with one thin end and one thick end in different strength levels, wherein the steel plate is cast into a continuous casting billet with chemical components changing along the length by adopting two tanks of molten steel with different components, and then rolled, so that the mechanical properties of the rolled wedge-shaped steel plate tend to be uniform, but the process is complex, and the wedge-shaped steel plate is only suitable for the wedge-shaped steel plate with one thin end and one thick end, and the steel plate produced by the above patents has no corrosion resistance. At present, the production of the corrosion-resistant ship plate with the variable thickness in the longitudinal direction is not reported.
In summary, the following problems mainly exist in the production of the steel plate for the cargo oil tank at present.
1) Higher alloying elements, high production cost and deteriorated steel plate performance.
2) The steel plate has low strength and toughness grade and can not meet the use requirement.
2) The steel plate is a steel plate with equal thickness, which is unfavorable for the optimization of the hull structure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a longitudinal variable-thickness steel plate for an upper deck of a crude oil cargo tank and a production method thereof, wherein the steel plate has excellent mechanical property and corrosion resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a longitudinal variable thickness steel plate for an upper deck of a crude oil cargo tank comprises the following chemical components: 0.020-0.080% of C, 0.10-0.50% of Si, 0.90-1.50% of Mn, 0.015-0.045% of Nb, 0.020-0.060% of V, 0.005-0.018% of Ti, 0.18-0.34% of Cu, 0.10-0.33% of Ni, 0.08-0.19% of Cr, 0.15-0.25% of Sn, 0.06-0.20% of Sb, 0.0120-0.0160% of N, 0.008-0.015% of P, less than or equal to 0.005% of S, 0.015-0.030% of Als, and the balance of Fe and inevitable impurities.
The components have the following functions:
c: the main strengthening elements in the steel are main elements for improving the hardenability of the steel; if the content is too low, the amount of carbide and the like produced decreases, and the effect of refining grains during rolling is impaired. When the content is too high, the content of cementite in the steel increases, which is detrimental to the low-temperature toughness, weldability, and corrosion resistance of the steel sheet. Therefore, the factors such as cost, performance and the like are comprehensively considered, and the range of C is controlled to be 0.020-0.080%.
Si: the necessary elements for steel-making deoxidation have strong solid solution capability in steel and can play a certain strengthening role, but the low-temperature toughness and welding performance of the steel are seriously damaged due to too high content. The range of Si is controlled to be 0.10-0.50%.
Mn: the transformation of ferrite and pearlite in steel can be delayed, the hardenability of the steel is greatly increased, the brittle transition temperature of the steel is reduced, and the impact toughness is improved, but the Mn content is too high, segregation is easily formed in the steel, the plasticity and the toughness of the steel are adversely affected, and the corrosion resistance of the steel is also easily reduced. Comprehensively considering, the range of Mn is controlled to be 0.90-1.50%.
Nb: grain refining elements, wherein carbon and nitride particles of the Nb which are not dissolved during heating are distributed on austenite grain boundaries, so that the growth of austenite grains of the steel during heating can be prevented; the invention can effectively delay the recrystallization of the deformed austenite, prevent the austenite grains from growing large, refine ferrite grains and improve the strength and toughness of the steel. The range of Nb is controlled to be 0.012 percent to 0.045 percent.
V: the strong carbide forming element has small influence on austenite recrystallization, and the large precipitation of V carbon and nitride can play the roles of refining and strengthening crystal grains at low temperature, so that the strength of the steel plate is improved, and simultaneously, the precipitation amount of the longitudinal variable-thickness steel plate at the thin and thick positions is controlled by utilizing the matching effect of the strong carbide forming element and another element N, so that the non-uniform mechanical property caused by the thickness difference in the length direction is compensated, and the property uniformity in the length direction is realized. The range of V is controlled to be 0.020-0.060%.
Cu: the corrosion resistance of the steel can be effectively improved, and various composite salts can be formed in the presence of P, so that the corrosion resistance of the steel is further improved; meanwhile, the strength and the low-temperature toughness of the steel can be improved; cu and Ni are coupled and gathered and thickened at a corrosion interface, so that the corrosion resistance of the steel in an acidic environment can be improved. However, if the content is too high, the hot brittleness of the steel deteriorates and hot cracks are easily generated. The Cu content is controlled to be 0.18-0.34%.
Ni: the corrosion resistance of the steel is obviously improved, the Ni element is enriched in the rust layer near the surface of the steel, and the rust layer enriched with the alloy element has ion selective permeability and can prevent Cl < - > from permeating, so that the metal in the rust layer is protected. Meanwhile, nickel can improve the low-temperature toughness of the steel. However, the addition of a large amount of nickel causes a large increase in the cost of steel due to its high price. Controlling the range of Ni to be 0.10-0.33%.
Cr: cr is mainly segregated at the grain boundary in the steel, so that the hardenability of the steel is improved, and the strength and toughness of the steel are improved. The addition of a small amount of Cr can effectively retard the initial corrosion of the steel plate, but when the Cr content is too high, the corrosion resistance of the steel is reduced along with the prolonging of the corrosion time in an acid environment. Controlling the range of Cr to be 0.08-0.19%.
Sn: when a small amount of tin is added into the steel, the corrosion resistance of the steel can be improved, and the self-corrosion potential of the steel in an acid environment is obviously improved, so that the electrochemical corrosion performance of the steel in the acid corrosion environment is effectively improved. The strength of the steel can be improved without greatly affecting the plasticity. The range of Sn is controlled to be 0.15-0.25%.
Sb: the mechanical properties of the steel are adversely affected, the strength of the steel is generally reduced, the brittleness of the steel is generally increased, but if a certain amount of antimony is added into the steel, the corrosion resistance and the wear resistance of the steel are improved to different degrees, and when the antimony is added with Sn in a compounding manner, the corrosion resistance of the steel is further improved. The range of Sb production is 0.06% -0.20%.
N: the important toughening elements of the invention are N which mainly exists in two states of a free state and a compound state in the steel, wherein the former existence has adverse effect on the toughness of the steel plate, and the latter existence has good effect on the comprehensive performance of the steel plate. In the case of a steel containing V, most of V does not sufficiently exhibit its precipitation strengthening action when nitrogen is deficient in the steel. In addition, the nitrogen-containing steel not only eliminates the cost increase caused by degassing and refining denitrogenation in the steel-making process, but also can fully play the role of microalloy elements by increasing nitrogen in the steel, saves the using amount of alloying elements and greatly reduces the production cost. The range of N is controlled to be 0.0120% -0.0160%.
P: improve the corrosion resistance of steel, can form various composite salts in the presence of Cu element, ensure that the crystal grains of the inner rust layer are fine and compact, and can resist Cl-The corrosion rate of the steel is reduced, but too high a content is detrimental to the low temperature toughness and weldability of the steel. The range of the control P is 0.010 percent to 0.030 percent.
Al: the strong deoxidizer produces highly fine and ultra-microscopic oxides in steel, and plays a role in refining grains. Controlling the range of Als to be 0.015-0.030%.
A production method of a longitudinal variable-thickness steel plate for an upper deck of a crude oil cargo oil tank comprises the following steps of smelting, continuous casting, heating by a heating furnace and rolling, and comprises the following specific steps:
(1) smelting
a. Adjusting components during converter smelting;
b. refining the molten steel, and feeding Ca-Si wires at the later stage of refining, wherein the quantity of the Ca-Si wires is not less than 500 m;
c. carrying out RH treatment on the refined molten steel for 20-60 min, and blowing nitrogen during the whole RH treatment process to ensure the final N content range of the steel; 0.0120 to 0.0160 percent of N;
(2) continuously casting molten steel to obtain a required casting blank, and controlling the superheat degree of a tundish to be 25-35 ℃;
(3) stacking and slowly cooling the casting blanks for not less than 36 hours;
(4) heating the casting blank to 1110-1180 ℃, wherein the heating rate is 10-20 ℃/min, and the heat preservation time is 40-240 min;
(5) rolling of
a. A rough rolling stage: rolling the heated casting blank, wherein the thickness of the casting blank is 1.5-2.5 times of the maximum thickness of the final LP steel plate, the starting rolling temperature of the casting blank is 1000-1100 ℃, and an intermediate blank is obtained after rolling is finished;
b. and (3) finish rolling stage: heating the intermediate blank obtained in the step a) to 840-880 ℃, then rolling with variable thickness, and rolling according to the shape and inclination required by the steel plate, wherein the final rolling temperature of the steel plate meets the LP steel plate
The temperature at the thickness is 780-830 ℃;
(6) cooling down
a. The rolled steel plate is subjected to accelerated cooling, and the starting cooling temperature meets the LP steel plate
The temperature of the thickness part is 720-800 ℃, and the temperature of the red returning meets the LP steel plate
The thickness is 520-650 ℃;
b. and cooling the steel plates after the re-reddening is finished to room temperature, wherein the steel plates with the maximum thickness of more than or equal to 40mm are stacked and slowly cooled, the stacking temperature is more than 350 ℃, and the stacking time is more than 12 h.
In the steps (5) and (6), t ismaxMaximum thickness of LP steel plate, tminIs the minimum thickness of the LP steel plate.
Compared with the prior art, the invention has the beneficial effects that:
by designing the chemical components and the rolling process of the longitudinal variable-thickness steel plate, the steel plate has excellent mechanical property and corrosion resistance. The yield strength of the alloy reaches over 380MPa, the elongation after fracture is over 26.0, the impact absorption energy at minus 40 ℃ is over 250J, the impact absorption energy at minus 60 ℃ is over 200J, and the annual average corrosion rate CR is less than or equal to 0.50 mm/year. The invention is suitable for the LP steel plate used for the upper deck of the cargo oil tank, fully exerts the strengthening effect of elements in the steel, and makes up the uneven mechanical property caused by the thickness difference in the length direction of the steel plate, thereby realizing the uniformity of the mechanical property in the length direction of the steel plate, and finally the uniformity of the mechanical property of the steel plate in the length direction is good, and the strength difference between the thick position and the thin position is within 25 MPa.
Drawings
FIG. 1 metallographic structure of thin end of steel plate of example 3.
FIG. 2 metallographic structure of thick end of steel plate in example 3.
FIG. 3 distribution diagram of precipitated phases at the thin end of the steel sheet of example 3.
FIG. 4 is a distribution diagram of precipitated phases at the thick end of the steel sheet of example 3.
Detailed Description
The following further illustrates embodiments of the invention:
a method for producing a longitudinal variable thickness steel plate for an upper deck of a crude oil cargo tank,
1) the smelting was carried out according to the chemical composition of the steel sheet design, which is shown in table 1.
Table 1: chemical composition of example Steel (wt%)
2) The obtained molten steel was subjected to continuous casting, heating, rolling, and cooling to obtain a longitudinally thickened steel sheet, the heating process being shown in Table 2, the rolling process being shown in Table 3, and the cooling process being shown in Table 4.
Table 2: example heating Process
| Numbering | Degree of superheat/. degree.C | Slow cooling time/h | Heating temperature/. degree.C | Temperature rise rate/° C/min | Holding time/min |
| 1 | 27 | 38 | 1125 | 13 | 60 |
| 2 | 29 | 42 | 1115 | 14 | 100 |
| 3 | 32 | 50 | 1145 | 16 | 150 |
| 4 | 33 | 54 | 1175 | 19 | 200 |
| 5 | 28 | 45 | 1155 | 18 | 180 |
| 6 | 30 | 52 | 1135 | 17 | 120 |
Table 3: rolling Process of examples
Table 4: example Cooling Process of Steel
| Numbering | Cold start temperature/. degree C | Temperature of re-reddening/. degree.C | Stacking temperature/. degree.C | Stacking time/h |
| 1 | 747 | 540 | 360 | 15 |
| 2 | 735 | 610 | 372 | 20 |
| 3 | 754 | 630 | - | - |
| 4 | 776 | 550 | 381 | 36 |
| 5 | 795 | 640 | 413 | 24 |
| 6 | 765 | 570 | 392 | 18 |
The mechanical properties and corrosion properties of the steels according to the examples are shown in table 5, and corrosion properties were evaluated by the corrosion resistance test method for the upper deck specified in "guidelines for testing corrosion resistant steel for cargo oil tanks of crude oil tanker" of china classification.
Table 5: mechanical Properties of examples
It will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the principles of the invention, and these modifications and variations also fall within the scope of the invention as defined in the appended claims. 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 their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (2)
1. A longitudinal variable thickness steel plate for an upper deck of a crude oil cargo tank is characterized by comprising the following chemical components: 0.020-0.080% of C, 0.10-0.50% of Si, 0.90-1.50% of Mn, 0.015-0.045% of Nb, 0.020-0.060% of V, 0.005-0.018% of Ti, 0.18-0.34% of Cu, 0.10-0.33% of Ni, 0.08-0.19% of Cr, 0.15-0.25% of Sn, 0.06-0.20% of Sb, 0.0120-0.0160% of N, 0.008-0.015% of P, less than or equal to 0.005% of S, 0.015-0.030% of Als, and the balance of Fe and inevitable impurities.
2. A production method of a longitudinal variable-thickness steel plate for an upper deck of a crude oil cargo oil tank is characterized by comprising the following steps of smelting, continuous casting, heating by a heating furnace and rolling, and the method comprises the following specific steps:
(1) smelting
a. Adjusting components during converter smelting;
b. refining the molten steel, and feeding Ca-Si wires at the later stage of refining, wherein the amount of the Ca-Si wires is not less than 500 m;
c. carrying out RH treatment on the refined molten steel for 20-60 min, and blowing nitrogen in the whole RH treatment process to ensure the final N content of the steel; the content of N is 0.0120 to 0.0160 percent;
(2) continuously casting molten steel to obtain a required casting blank, and controlling the superheat degree of a tundish to be 25-35 ℃;
(3) stacking and slowly cooling the casting blanks for not less than 36 hours;
(4) heating the casting blank to 1110-1180 ℃, wherein the heating rate is 10-20 ℃/min, and the heat preservation time is 40-240 min;
(5) rolling of
a. A rough rolling stage: rolling the heated casting blank, wherein the thickness of the casting blank is 1.5-2.5 times of the maximum thickness of the final LP steel plate, the starting rolling temperature of the casting blank is 1000-1100 ℃, and an intermediate blank is obtained after rolling is finished;
b. and (3) finish rolling stage: heating the intermediate blank obtained in the step a) to 840-880 ℃, then rolling with variable thickness, and rolling according to the shape and inclination required by the steel plate, wherein the final rolling temperature of the steel plate meets the LP steel plate
The temperature at the thickness is 780-830 ℃; wherein: t is tmaxMaximum thickness of LP steel plate, tminThe minimum thickness of the LP steel plate;
(6) cooling down
a. The rolled LP steel plate is subjected to accelerated cooling, and the open cooling temperature meets the LP steel plate
The temperature of the thickness part is 720-800 ℃, and the temperature of the red returning meets the LP steel plate
The thickness is 520-650 ℃;
b. and cooling the steel plates after the re-reddening is finished to room temperature, wherein the steel plates with the maximum thickness of more than or equal to 40mm are stacked and slowly cooled, the stacking temperature is more than 350 ℃, and the stacking time is more than 12 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116121651A (en) * | 2023-02-14 | 2023-05-16 | 南京钢铁股份有限公司 | High-strength corrosion-resistant crude oil storage tank steel plate for large heat input welding and manufacturing method |
| CN116770190A (en) * | 2023-05-30 | 2023-09-19 | 鞍钢股份有限公司 | Low-yield-ratio longitudinal variable-thickness bridge steel and manufacturing method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1946864A (en) * | 2004-04-14 | 2007-04-11 | 住友金属工业株式会社 | Steel product for cargo oil tank |
| CN103286127A (en) * | 2013-06-14 | 2013-09-11 | 首钢总公司 | Method for manufacturing anticorrosion steel plate for upper deck on crude oil tanker oil cargo tank and steel plate |
| CN103290186A (en) * | 2013-06-14 | 2013-09-11 | 首钢总公司 | Manufacturing method of corrosion-proof steel plate used for crude oil tanker cargo oil hold inner bottom plate and steel plate |
| CN105821314A (en) * | 2016-04-26 | 2016-08-03 | 江苏省沙钢钢铁研究院有限公司 | Corrosion-resistant steel plate for bottom plate in cargo oil tank of crude oil carrier and production method thereof |
| CN108118240A (en) * | 2016-11-30 | 2018-06-05 | 宝山钢铁股份有限公司 | A kind of crude oil carrier Cargo Oil Ceiling anti-corrosion steel plate and its manufacturing method |
| CN108118249A (en) * | 2016-11-30 | 2018-06-05 | 宝山钢铁股份有限公司 | A kind of crude oil carrier oil cargo tank upper deck anti-corrosion steel plate and its manufacturing method |
| CN111996462A (en) * | 2020-09-07 | 2020-11-27 | 鞍钢股份有限公司 | Longitudinal variable-thickness ultrahigh-strength ship board and production method thereof |
| CN112126853A (en) * | 2020-09-07 | 2020-12-25 | 鞍钢股份有限公司 | Longitudinal variable-thickness high-strength ship board and production method thereof |
-
2021
- 2021-09-14 CN CN202111083833.5A patent/CN114107800B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1946864A (en) * | 2004-04-14 | 2007-04-11 | 住友金属工业株式会社 | Steel product for cargo oil tank |
| CN103286127A (en) * | 2013-06-14 | 2013-09-11 | 首钢总公司 | Method for manufacturing anticorrosion steel plate for upper deck on crude oil tanker oil cargo tank and steel plate |
| CN103290186A (en) * | 2013-06-14 | 2013-09-11 | 首钢总公司 | Manufacturing method of corrosion-proof steel plate used for crude oil tanker cargo oil hold inner bottom plate and steel plate |
| CN105821314A (en) * | 2016-04-26 | 2016-08-03 | 江苏省沙钢钢铁研究院有限公司 | Corrosion-resistant steel plate for bottom plate in cargo oil tank of crude oil carrier and production method thereof |
| CN108118240A (en) * | 2016-11-30 | 2018-06-05 | 宝山钢铁股份有限公司 | A kind of crude oil carrier Cargo Oil Ceiling anti-corrosion steel plate and its manufacturing method |
| CN108118249A (en) * | 2016-11-30 | 2018-06-05 | 宝山钢铁股份有限公司 | A kind of crude oil carrier oil cargo tank upper deck anti-corrosion steel plate and its manufacturing method |
| CN111996462A (en) * | 2020-09-07 | 2020-11-27 | 鞍钢股份有限公司 | Longitudinal variable-thickness ultrahigh-strength ship board and production method thereof |
| CN112126853A (en) * | 2020-09-07 | 2020-12-25 | 鞍钢股份有限公司 | Longitudinal variable-thickness high-strength ship board and production method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116121651A (en) * | 2023-02-14 | 2023-05-16 | 南京钢铁股份有限公司 | High-strength corrosion-resistant crude oil storage tank steel plate for large heat input welding and manufacturing method |
| CN116770190A (en) * | 2023-05-30 | 2023-09-19 | 鞍钢股份有限公司 | Low-yield-ratio longitudinal variable-thickness bridge steel and manufacturing method thereof |
| CN116770190B (en) * | 2023-05-30 | 2024-05-14 | 鞍钢股份有限公司 | Low-yield-ratio longitudinal variable-thickness bridge steel and manufacturing method thereof |
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