CN112647014B - Building structural steel suitable for marine atmospheric environment and production method thereof - Google Patents
Building structural steel suitable for marine atmospheric environment and production method thereof Download PDFInfo
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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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- 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
- 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
- B21B37/76—Cooling control on the run-out table
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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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- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention provides a building structural steel suitable for a marine atmospheric environment, belonging to the technical field of steel plate production, and comprising the following chemical components in percentage by mass: carbon: 0.07% -0.17%, silicon: 0.6-0.8%, manganese: 0.3% -1.0%, phosphorus: 0.08-0.15%, sulfur: 0.005-0.035%, copper: 0.15% -0.2%, antimony: 0.1% -0.2%, cerium: 0.0025% -0.0045%; and optionally comprises: tin: 0.01-0.02%, vanadium: 0.05-0.1% of one or two of them, and the rest is iron and inevitable impurities. The building structural steel has excellent corrosion resistance, and can effectively improve the service life and safety of a steel structure building. The invention also provides a production method of the building structural steel suitable for the marine atmospheric environment.
Description
Technical Field
The invention belongs to the technical field of steel plate production, and relates to a building structural steel suitable for a marine atmospheric environment and a production method thereof.
Background
With the rapid development of urbanization in China, the steel structure gradually replaces the concrete structure to become a development trend due to the advantages of light weight, low foundation cost, short construction period, capability of solving the complex problem of large space, better integrity and shock resistance, renewable utilization of resources and the like. However, steel structure buildings have the problem of atmospheric corrosion, and particularly for coastal atmospheric environments, the corrosion rate of steel materials is greatly increased due to the environmental characteristics of high Cl ion deposition rate, high humidity, large day-night temperature difference, high ultraviolet intensity and the like. Therefore, it is required to develop and use steel for construction structures dedicated to coastal areas to ensure durability and safety of the entire structure.
In the prior art and actual production and construction, steel structure buildings in coastal regions still use Q355B and Q235B as main steel raw materials, and the surfaces of the steel structure buildings are sprayed with anticorrosive paint for rust prevention. However, since the conditions in coastal areas are severe, the anticorrosive paint cannot completely block the permeation of Cl ions, and especially, preferential corrosion is likely to occur at bolted joints or welded joint positions, which seriously affects the service life of the whole steel structure building or causes a large amount of maintenance cost.
The current field of building structural steel for marine atmospheric environment mainly has the following defects:
(1) the strength level is low, mainly ordinary steel with the yield strength of 355MPa level is not beneficial to weight reduction of the component;
(2) the existing steel has poor corrosion resistance, and particularly in the marine atmospheric environment, the service cycle is short, and the maintenance cost is high;
(3) poor weldability and insufficient low-temperature toughness, and is not suitable for low-temperature river-following areas.
(4) The influence of the yield ratio on the building element is not considered, and the yield ratio of the steel material needs to be controlled.
Disclosure of Invention
In order to solve the technical problem of poor corrosion resistance of the building structural steel for the marine atmospheric environment, the invention provides the building structural steel suitable for the marine atmospheric environment, and the building structural steel has excellent corrosion resistance and can effectively improve the service life and the safety of a steel structure building.
The invention also provides a production method of the building structural steel suitable for the marine atmospheric environment.
The invention is realized by the following technical scheme:
the building structural steel suitable for the marine atmospheric environment comprises the following chemical components in percentage by mass:
carbon: 0.07% -0.17%, silicon: 0.6-0.8%, manganese: 0.3% -1.0%, phosphorus: 0.08-0.15%, sulfur: 0.005-0.035%, copper: 0.15% -0.2%, antimony: 0.1% -0.2%, cerium: 0.0025 to 0.0045 percent, and the balance of iron and inevitable impurities;
the chemical composition of the building structural steel further comprises 0-2 items of the following elements:
tin: 0.01-0.02%, vanadium: 0.05-0.1 percent.
A method for producing a building structural steel suitable for use in marine atmospheric environments, comprising:
heating a casting blank, and then carrying out rough rolling and finish rolling to obtain a hot rolled plate;
and cooling the hot rolled plate, and coiling the cooled hot rolled plate into a hot rolled coil.
The preparation method of the casting blank comprises the following steps: after the molten iron is pretreated, molten steel is obtained through smelting and refining, and the molten steel is subjected to a continuous casting process to obtain the casting blank, wherein the molten steel has the chemical components.
Furthermore, in the continuous casting process, the temperature of the straightening section is more than 750 ℃.
Further, the casting blank heating process adopts a hot charging and hot conveying process, the heating temperature of the casting blank is 1160-1200 ℃, and the heat preservation time is less than 180 min.
Further, the thickness of the intermediate blank obtained by rough rolling is 3-8 times of that of the finished product, the precision rolling inlet temperature is 1000-1050 ℃, and the finish rolling temperature is 820-860 ℃.
Further, the cooling after rolling adopts a front-section cooling mode for rapid cooling, the target coiling temperature is 520-580 ℃, and the cooling speed is more than 40 ℃/s.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention relates to a building structural steel suitable for marine atmospheric environment, which adopts a low-Mn, medium-high-C and high-Si component system, and is added with Cu-P-Sb-Ce in a compounding way, so that the corrosion resistance of the coastal atmospheric environment is ensured, the alloy cost is reduced, the building structural steel with the thickness specification of 3-20mm is produced by combining the improvement of a controlled rolling and controlled cooling process, the yield strength grade of the material covers 390MPa-460MPa, and the building structural steel does not crack when being subjected to 180-degree cold bending D =2 a; the yield ratio is less than or equal to 0.83, the impact energy at the temperature of minus 20 ℃ is more than or equal to 47J, and the corrosion rate of an accelerated corrosion test is less than or equal to 1.467 g/(m)2H), a relative corrosion rate of 43.7% or less compared to Q355B; the product of the invention is suitable for steel structure construction in coastal atmospheric environment, and the material has good obdurability, weldability, cold formability and corrosion resistance.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a photograph of the metallographic structure of the structural steel for construction suitable for marine atmospheric environment produced by the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the invention improves the chemical components and the preparation process of the building structural steel to obtain the building structural steel with high corrosion resistance, and is particularly suitable for buildings in coastal regions.
Specifically, the chemical composition of the building structural steel is as follows:
carbon: 0.07% -0.17%, silicon: 0.6-0.8%, manganese: 0.3% -1.0%, phosphorus: 0.08-0.15%, sulfur: 0.005-0.035%, copper: 0.15% -0.2%, antimony: 0.1% -0.2%, cerium: 0.0025 to 0.0045 percent, and the balance of iron and inevitable impurities;
the chemical composition of the building structural steel further comprises one or two of the following elements:
tin: 0.01-0.02%, vanadium: 0.05-0.1 percent.
The chemical components of the building structural steel adopt a medium-high C-high Si-low Mn component system, the welding crack sensitivity index is controlled by controlling the addition amount of C, Si and Mn, the proper increase of the C content is used for improving the strength index, the purpose of reducing the Mn content is to ensure the strength on the premise of controlling the cost, and simultaneously, the segregation of Mn element is avoided, and the high Si is beneficial to the improvement of the corrosion resistance and the strength of the material. In the aspect of alloy, a micro-alloying idea of Cu-P-Sb-Ce composite addition is adopted, noble metal elements such as Nb, Mo, Ni and Cr are not added, and the alloy cost is effectively controlled and reduced. Wherein, the addition of P, Cu element not only improves the corrosion resistance of the material, but also greatly contributes to ensuring the strength. The corrosion resistance of the material is further improved by selectively adding Sn element so as to meet the requirements of different users; the selective addition of V element further improves the strength index of the material to meet the requirements of steel products with different strength grades.
The construction structural steel for the marine atmospheric environment has the following effects:
carbon: carbon is primarily intended to improve strength and has cost advantages. However, the excessively high C is unfavorable for plasticity and forming performance, the upper limit and the lower limit are required to be clearly limited, and the carbon content adopted by the invention is 0.07-0.17%;
silicon: silicon is a solid solution strengthening element, but the addition of too high silicon can have a negative effect on the plasticity of the material. In addition, Si plays a certain role in improving the corrosion resistance of the material, and is beneficial to controlling the target structure to obtain a certain proportion of polygonal ferrite and improving the cold formability of the material. In the invention, by adding more Si and combining with a proper controlled rolling and controlled cooling process, polygonal ferrite with a sufficient proportion is obtained, so that the yield ratio of the material is reduced. Therefore, the content of the added silicon is 0.6 to 0.8 percent;
manganese: manganese has a solid solution strengthening effect and can improve the hardenability of the material, and is one of important elements for improving the strength of the material, but when the manganese content is excessively high, segregation is easily generated, and the toughness of the material is reduced. In addition, from the perspective of weldability of materials, the addition amount of C and Mn is cooperatively controlled, so that the strength is ensured, and welding cold cracks are not generated, and the content of the added manganese is 0.3-1.0%;
sulfur: the invention allows higher S content mainly aiming at combining sulfur with a part of Cu to generate copper sulfide to improve the hot brittleness problem of Cu, combining with Sb to improve the corrosion resistance of the steel, and improving the mechanical property of the steel by means of the nanometer-scale precipitation of S. However, the S element is too high, and adversely affects the toughness of the steel. Therefore, the sulfur content limited by the invention is 0.005-0.035%;
phosphorus: in the invention, P is an important element for improving the corrosion resistance of the material and also an important element for ensuring the strength of the material. In the marine atmospheric corrosion environment, P also has good corrosion resistance. The corrosion resistance of the material is improved by the combined addition of P, Sb and a small amount of Cu under the synergistic effect. The phosphorus content of the additive is 0.08-0.15%;
copper: the purpose of adding Cu in the invention is to improve the corrosion resistance of the material, and particularly has good effect on the corrosive environment of the coastal atmospheric environment; however, since Cu belongs to a noble alloy, the cost of the alloy needs to be controlled to control the upper limit of addition; in addition, excessive Cu addition causes hot shortness in the steel rolling process. Therefore, 0.15-0.20% of copper is added;
antimony: aiming at the marine atmospheric corrosion environment, the Sb element is added to improve the corrosion resistance of the steel. Besides Sb element can form a compact oxide film on the surface and change the potential of a matrix electrode to improve the corrosion resistance, the Cu-P-Sb added in the invention can further improve the corrosion resistance of the steel surface. And the corrosion resistance of the material in the marine atmosphere environment is improved by selectively adding Sn element and matching with Sb. Therefore, 0.1-0.2% of antimony is added;
cerium: the cerium element can improve the appearance of the inclusion into a spherical shape, control the inclusion into a small size and weaken the influence of the inclusion on the material performance and the corrosion resistance. In addition, by adding cerium, the probability of cracking and surface crack defects caused by Cu, Sb and Sn elements can be weakened, and the welding performance of the material can be improved. Therefore, the invention adds 25-45ppm of cerium element.
Tin: the tin has the functions of improving the marine atmospheric corrosion resistance of the steel, acting on the surface of the steel together with Sb to form a compact oxide film and weakening electrode corrosion. However, tin is a low-melting-point element, so that on one hand, the addition amount needs to be controlled to avoid cracking and crack defects, and meanwhile, a proper controlled rolling and controlled cooling process needs to be matched. The invention selectively adds 0.01-0.02% of tin element aiming at the special or higher corrosion resistance requirement of the coastal structural steel of partial users.
Vanadium: the vanadium functions in the present invention to improve the strength of the steel and the weld joint properties. The strength grade of the steel is improved to 460MPa through the separation of V in the rolling process; meanwhile, the addition of the V element is beneficial to forming a hydrogen trap at the position of a welding joint, and the delayed cracking resistance of the material is improved. The function of V needs to be matched with a controlled rolling and controlled cooling process to play the maximum role. The invention aims at the structural steel for the high-strength level marine atmospheric environment, and selectively adds 0.05-0.1% of vanadium element.
The invention has the following improvement points on the production process:
the smelting process is suitable for building structural steel in marine atmosphere environment, and has continuous casting straightening section temperature over 750 deg.c to avoid Sb, Cu, V and other elements causing corner crack of casting blank. If the temperature of the straightening section is lower than 750 ℃, the corner part of the casting blank enters a brittleness temperature range, and the straightening in the brittleness region easily causes cracking or invisible cracks, and further the straightening is transferred to a finished product of hot rolling, so that the problem of edge cracking of the finished steel plate is caused.
In the rolling process, the following rolling and cooling control technological parameters are strictly controlled.
The casting blank is heated to 1160-1200 ℃ in a heating furnace by adopting a hot charging and hot conveying process, and the furnace time is less than 180 min; the hot charging and hot conveying process is adopted for reducing the total in-furnace time, and through rapid heating and accurate control of a heating temperature interval, copper brittleness cracking is avoided, and cracking defects caused by phosphorus and antimony elements are avoided, wherein the heating temperature interval is set to be 1160-1200 ℃;
the two-stage controlled rolling is adopted, the thickness of the intermediate blank is 8-12 times that of the finished product, so that enough rolling reduction of an austenite non-recrystallization region is ensured, grain refinement is facilitated, and the high-temperature performance of the final product is improved; the thickness of the intermediate billet is increased, and the length of the intermediate billet can be shortened, so that the temperature difference between the head and the tail of the finish rolling is reduced, and the load of a rolling mill is prevented from being increased due to the fact that the temperature of the tail is reduced too much. The adoption of larger thickness of the intermediate blank is beneficial to improving the final strength and toughness of the strip steel.
In the finish rolling process, the finish rolling inlet temperature is strictly controlled to be 1000-1050 ℃ according to the thickness specification of a finished product, and the finish rolling temperature is 820-860 ℃; the main purpose of controlling the finish rolling inlet temperature is to control the rolling quantity of a partial recrystallization zone and avoid the reduction of impact toughness caused by the occurrence of a large proportion of mixed crystal tissues; the purpose of adopting lower finish rolling temperature is to refine crystal grains and improve the toughness of the material.
And (4) rapidly cooling the steel strip after the steel strip is finish rolled by adopting a front section cooling mode, wherein the cooling speed is more than 40 ℃/s. On one hand, the steel is beneficial to strengthening the structure and fine grain strengthening after phase transformation, and on the other hand, the steel is beneficial to controlling the yield ratio of the building steel. The target coiling temperature is 520-580 ℃, the target structure is mainly polygonal ferrite, bainite and acicular ferrite, and the toughness reduction caused by a large amount of pearlite is avoided. The yield ratio is reduced by means of polygonal ferrite, the strength and toughness of the material are improved by means of bainite and acicular ferrite, and good corrosion resistance is obtained.
Based on the improvement, the yield strength grade of the building structural steel prepared by the invention covers 390MPa-460MPa, and the steel does not crack when subjected to 180-degree cold bending D =2 a; the yield ratio is less than or equal to 0.83, the impact energy at the temperature of minus 20 ℃ is more than or equal to 47J, and the corrosion rate of an accelerated corrosion test is less than or equal to 1.467 g/(m)2H), a relative corrosion rate of 43.7% or less compared to Q355B. The material is suitable for steel structure construction in coastal atmospheric environment, and has good toughness, weldability, cold formability and corrosion resistance.
The construction steel for marine atmospheric environment according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Examples
The building structural steel suitable for the marine atmospheric environment comprises the following chemical components in percentage by mass:
0.07 to 0.17 percent of carbon, silicon: 0.6-0.8%, manganese: 0.3% -1.0%, phosphorus: 0.08-0.15%, sulfur: 0.005-0.035%, copper: 0.15% -0.2%, antimony: 0.1% -0.2%, cerium: 0.0025% -0.0045%, and selectively adding one or two of the following alloy elements: tin: 0.01-0.02%, vanadium: 0.05-0.1%, and the balance of iron and inevitable impurities.
A production method of building structural steel suitable for marine atmospheric environment comprises the following steps:
s1: after the molten iron is pretreated, molten steel is obtained through smelting and refining, and a casting blank is obtained after the molten steel is smelted through a converter; the smelting process strictly regulates and controls the contents of elements such as P, S, Sb, Ce and the like, and the casting blank comprises the following chemical components in percentage by weight: 0.07 to 0.17 percent of carbon, silicon: 0.6-0.8%, manganese: 0.3% -1.0%, phosphorus: 0.08-0.15%, less than or equal to 0.005-0.035%, copper: 0.15% -0.2%, antimony: 0.1% -0.2%, cerium: 0.0025% -0.0045%, and selectively adding one or two of the following alloy elements: tin: 0.01-0.02%, vanadium: 0.05-0.1%, and the balance of iron and inevitable impurities.
S2: and (3) putting the casting blank into a heating furnace for heating by adopting a hot charging and hot conveying process, and controlling the heating temperature and the heat preservation time.
S3: and (4) putting the heated casting blank into a rolling mill for rolling, and controlling the temperature of a finish rolling inlet and outlet to obtain a steel plate with the target thickness.
S4: cooling the hot rolled plate, carrying out laminar cooling by adopting a front-section cooling mode, and coiling the cooled hot rolled plate to obtain a steel plate finished product; controlling the target coiling temperature to be 520-580 ℃ in the coiling process; the thickness of the steel plate finished product is 3.0-20.0 mm.
Specific examples the smelting chemistry is shown in table 1:
in the table, the calculation formula of the atmospheric corrosion resistance index (I) is as follows:
I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni)(%P)-33.39(%Cu)2
in the table, the calculation formula of the weld cold crack sensitivity index Pcm is as follows:
Pcm（%）=C+Si/30+Mn/20+Cu/20+Cr/20+60Ni+Mo/15+V/10+5B
TABLE 1 chemical compositions suitable for use in examples and comparative examples of architectural structural steels for marine atmospheric environments
The specific production process of examples No. 1 to No. 12 is shown in Table 2:
TABLE 2 production process of construction structural steel examples and comparative examples suitable for marine atmospheric environment
The mechanical properties of the steel materials of examples 1 to 12 and comparative examples are shown in Table 3:
TABLE 3 Steel Properties of examples and comparative examples of architectural structural steels suitable for use in marine atmospheric environments
The examples and comparative examples were subjected to periodic infiltration tests, the test methods being: 0.01mol/L sodium bisulfite solution, test time 72 hours, test standard TB/T2375-1993.
TABLE 4 Corrosion rates of structural steel examples and comparative steel examples for use in marine atmospheric environments
The building structural steel for the marine atmospheric environment, provided by the invention, has the advantages that through reasonable design of chemical components and proportions in the steel and combination of a rolling and cooling control technology of an accurate process window, a finally obtained steel plate finished product has high strength, good cold forming performance, good low-temperature toughness and welding performance and excellent corrosion resistance, meanwhile, the yield ratio is not more than 0.83, and the steel is suitable for being used in steel structures in the field of buildings. Compared with the traditional steel for the Q355B building structure, the steel plate has the advantages that the room temperature strength, the plasticity and the toughness of the steel plate are improved, meanwhile, the corrosion resistance of the steel plate reaches more than 2.28 times of the corrosion resistance of Q355B, and the corrosion resistance and the safety of the manufactured steel structure are greatly improved.
As can be seen from the figure 1, the metallurgical structure of the architectural structural steel suitable for the marine atmospheric environment is ferrite (polygonal ferrite and acicular ferrite) + bainite + island martensite, the structure is fine and uniform, and the steel has good corrosion resistance and good cold formability and toughness.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. The building structural steel suitable for the marine atmospheric environment is characterized by comprising the following chemical components in percentage by mass:
carbon: 0.07% -0.17%, silicon: 0.6-0.8%, manganese: 0.3% -1.0%, phosphorus: 0.08-0.15%, sulfur: 0.005-0.035%, copper: 0.15% -0.2%, antimony: 0.1% -0.2%, cerium: 0.0025 to 0.0045 percent, and the balance of iron and inevitable impurities; the metallographic structure of the building structural steel comprises polygonal ferrite, acicular ferrite, bainite and island martensite;
the preparation method of the building structural steel comprises the following steps:
heating a casting blank, and then carrying out rough rolling and finish rolling to obtain a hot rolled plate; cooling the hot rolled plate, and coiling the cooled hot rolled plate into a hot rolled coil;
wherein the casting blank heating process adopts a hot charging hot conveying process, the casting blank heating temperature is 1160-1200 ℃, the heat preservation time is less than 180min, the thickness of the intermediate blank obtained by rough rolling is 3-8 times of that of the finished product, the finish rolling inlet temperature is 1000-1050 ℃, and the finish rolling temperature is 820-860 ℃.
2. The structural steel for marine atmospheric environment according to claim 1, wherein the structural steel further comprises, in terms of chemical composition and mass fraction: tin: 0.01% -0.02% and/or vanadium: 0.05-0.1 percent.
3. The constructional steel suitable for the marine atmospheric environment as claimed in claim 2, wherein the casting blank preparation method comprises the following steps:
after the molten iron is pretreated, molten steel is obtained through smelting and refining, and the casting blank is obtained through the molten steel through a continuous casting process.
4. The constructional steel for marine atmospheric environments as defined in claim 3, wherein the straightening section temperature in the continuous casting process is more than 750 ℃.
5. The constructional steel suitable for the marine atmospheric environment as claimed in claim 1, wherein the post-rolling cooling is rapidly cooled in a front-end cooling mode, the target coiling temperature is 520 ℃ to 580 ℃, and the cooling rate is more than 40 ℃/s.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001214236A (en) * | 2000-01-31 | 2001-08-07 | Nippon Steel Corp | Corrosion resistant steel for crude oil and heavy oil storage speed |
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| EP2905348B1 (en) * | 2014-02-07 | 2019-09-04 | ThyssenKrupp Steel Europe AG | High strength flat steel product with bainitic-martensitic structure and method for manufacturing such a flat steel product |
| MX2017001527A (en) * | 2014-08-07 | 2017-05-11 | Jfe Steel Corp | High-strength steel sheet and method for manufacturing same. |
| JP6515393B2 (en) * | 2015-04-15 | 2019-05-22 | 日本製鉄株式会社 | Hot rolled steel sheet and method of manufacturing the same |
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| JP2001214236A (en) * | 2000-01-31 | 2001-08-07 | Nippon Steel Corp | Corrosion resistant steel for crude oil and heavy oil storage speed |
| CN106011658A (en) * | 2016-07-11 | 2016-10-12 | 武汉钢铁股份有限公司 | Marine climate-resistant and corrosion-resistant steel and production method thereof |
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| CN108396231A (en) * | 2018-06-01 | 2018-08-14 | 钢铁研究总院 | A kind of function and service high-strength building structural steel and its manufacturing method |
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