CN113667888A - 690 MPa-grade low-silicon corrosion-resistant bridge steel and preparation method thereof - Google Patents
690 MPa-grade low-silicon corrosion-resistant bridge steel and preparation 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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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Abstract
The application relates to the field of bridge steel manufacturing, in particular to 690 MPa-level low-silicon industrial atmospheric corrosion resistant bridge steel and a preparation method thereof. The bridge steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.10%, Si: 0.02 to 0.5%, Mn: 0.80-2.00%, P is less than or equal to 0.030%, S is less than or equal to 0.005%, Cr: 0.20-0.80%, Ni: 0.10-0.80%, Cu: 0.20-0.60%, Als: 0.010-0.050%, and the balance of Fe and inevitable impurities. S is controlled to be less than or equal to 0.005 percent, and the corrosion resistance of the steel is ensured; si is added to improve the corrosion resistance of the steel material; the mass fraction of Si is 0.02-0.5%, so that the corrosion resistance deterioration of steel can be avoided, the mass fraction of Cu is controlled, the Cu is enriched at the defects such as gaps, holes and the like of the rust layer, and the quality of the rust layer can be improved; the mass fraction of Cr is 0.20-0.80%, a passive film cannot be formed, and the corrosion-induced sensitivity of a steel matrix can be reduced; the mass fractions of elements such as S, Si, Cu, Cr and the like are comprehensively controlled, so that the elements interact with each other to improve the corrosion resistance of the bridge steel.
Description
Technical Field
The application relates to the field of bridge steel manufacturing, in particular to 690 MPa-level low-silicon corrosion-resistant bridge steel and a preparation method thereof.
Background
The corrosion of materials is widely existed in various fields of social and economic construction, various accidents caused by the corrosion are surprised, and the development of the social and economic is seriously influenced. The corrosion cost of China accounts for about 3.4% of GDP. With the vigorous development of the transportation industry, the requirements for the load capacity, the seismic performance, the corrosion resistance and the like of the bridge structure are continuously improved, so that the basic mechanical performance of the material and the corrosion resistance of the bridge structure are considered.
With the rapid development of the industrial society, a large amount of fuel oil tail gas and coal-fired flue gas containing sulfur dioxide components are discharged into the atmosphere. Many bridge structures are erected in industrial corrosion, acid rain and other environments, and the weather-resistant bridge steel is exposed in the industrial atmospheric environment for a long time and can generate corrosion damage to steel structural members to different degrees, so that the safety reliability and the durability of the steel structural members are influenced. . Therefore, the development of a bridge steel having corrosion resistance is an urgent need in the field of bridge steels.
Disclosure of Invention
The application provides 690 MPa-grade low-silicon corrosion-resistant bridge steel and a preparation method thereof, and aims to solve the technical problem that the bridge steel is not corrosion-resistant.
In a first aspect, the present application provides a 690MPa grade low silicon corrosion resistant bridge steel, the bridge steel chemical composition comprising, in mass fractions: c is less than or equal to 0.10%, Si: 0.02 to 0.5%, Mn: 0.80-2.00%, P is less than or equal to 0.030%, S is less than or equal to 0.005%, Cr: 0.20-0.80%, Ni: 0.10-0.80%, Cu: 0.20-0.60%, Als: 0.010-0.050%, and the balance of Fe and inevitable impurities.
Optionally, the bridge steel comprises the following chemical components in parts by mass: c: 0.04-0.08%, Si: 0.05-0.20%, Mn: 0.80-1.60%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Cr: 0.30-0.60%, Ni: 0.20-0.40%, Cu: 0.30-0.60%, Als: 0.015 to 0.050% and the balance of Fe and inevitable impurities.
Optionally, the metallographic structure of the bridge steel comprises 85-90% of bainite and 10-15% of ferrite in volume fraction.
Optionally, the potential difference of the micro-area electrode of the bainite is 15-25 mv.
Optionally, the properties of the bridge steel include yield strength not less than 690MPa, tensile strength 820-920 MPa, and yield ratio 0.75-0.8.
In a second aspect, a 690MPa grade low silicon corrosion resistant bridge steel, the method comprising the steps of:
obtaining a casting blank containing the chemical components;
heating, rough rolling, finish rolling, sectional cooling and tempering are sequentially carried out on the casting blank to obtain the bridge steel;
the final cooling temperature of the sectional cooling is 100-300 ℃.
Optionally, the segmented cooling sequentially comprises a first cooling and a second cooling, and the rate of the first cooling is 1-2 ℃/s; the second cooling rate is 15-35 ℃/s.
Optionally, the initial rolling temperature of the finish rolling is 920-835 ℃, and the final rolling temperature is 750-820 ℃.
Optionally, the tempering temperature is 180-380 ℃.
The application provides application of bridge steel, and the application comprises application of the bridge steel in building.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the chemical components and the mass fraction of the bridge steel are controlled, S is controlled to be less than or equal to 0.005%, and the corrosion resistance of the steel is ensured; si element is added to improve the endurance of the steel materialThe corrosion performance is that in the marine environment, the mass fraction of silicon in the steel matrix can increase the proportion of superparamagnetic alpha-FeOOH, so that the average grain diameter of goethite is reduced, and the reduction of the grain diameter of the alpha-FeOOH can enhance the protection capability of a rust layer so as to reduce the corrosion rate of carbon steel; in the industrial atmosphere, the main existing form of Si element in the rust layer is Fe2SiO4It is loose and porous and cannot block O2、HSO3 -The entering of corrosive media finally leads to the reduction of the protection capability of the rust layer; the mass fraction of Si is 0.02-0.5%, so that the corrosion resistance of the steel can be prevented from being deteriorated; 0.02-0.5% of silicon can be dissolved in ferrite and austenite to improve the hardness and strength of steel, and because the bonding capacity of the silicon and oxygen is stronger than that of iron, low-melting-point silicate is easily generated during welding, and the fluidity of slag and molten metal is increased, so that the corrosion resistance of the steel is ensured; the mass fraction of the Cu element is controlled to be 0.20-0.60%, and the quality of the rust layer can be improved by enriching Cu at the defects such as gaps, holes and the like of the rust layer; the mass fraction of Cr is controlled to be 0.30-0.60%, so that the corrosion-induced sensitivity of a steel matrix can be reduced; the corrosion resistance of the bridge steel is improved through the comprehensive control of elements such as S, Si, Cu, Cr and the like and mass fractions thereof and the interaction of the elements, and the corrosion rate of the bridge steel in the application is low as measured by a TB/T2375 cycle immersion corrosion test for 72 hours.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a method for manufacturing the bridge steel according to an embodiment of the present disclosure;
FIG. 2 is a metallographic structure diagram of the structure of example 1 of the present application;
FIG. 3 is a graph of relative corrosion rates for each of the examples and comparative examples.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
A690 MPa grade low-silicon industrial atmospheric corrosion resistant bridge steel, which comprises the following chemical components in percentage by mass: c is less than or equal to 0.10%, Si: 0.02 to 0.5%, Mn: 0.80-2.00%, P is less than or equal to 0.030%, S is less than or equal to 0.005%, Cr: 0.20-0.80%, Ni: 0.10-0.80%, Cu: 0.20-0.60%, Als: 0.010-0.050%, and the balance of Fe and inevitable impurities.
In the embodiment of the application, the mass fraction of C is selected to be less than or equal to 0.10%, C is an effective element for improving the strength of steel, when the mass fraction of C is higher, such as more than 0.12%, martensite is easily formed to deteriorate the low-temperature toughness of steel, the tensile strength is easily over the upper limit, and the influence on the weldability is larger. When the mass fraction of carbon is low, for example, less than 0.04%, the strength of the steel sheet becomes insufficient, the hard phase in the steel becomes relatively small, and the yield ratio control may be difficult. The mass fraction of C may preferably be 0.04 to 0.08%.
In the embodiment of the application, the mass fraction of Mn is 0.80-2.00%, and Mn is an important toughening element and an austenite stabilizing element, can expand an austenite region in an iron-carbon phase diagram and promotes medium-temperature tissue transformation. Mn with a higher mass fraction is very likely to cause severe center segregation in steel, deteriorates the low temperature toughness of steel, is likely to cause cracks in the HAZ steel sheet during welding, and is unnecessary for obtaining the mechanical properties of the steel of the present invention, while Mn with a too low mass fraction is likely to lower the strength of steel. The mass fraction of Mn is preferably 0.80 to 1.60%.
In the embodiment of the application, P is less than or equal to 0.010 percent, and the higher mass fraction of P can obviously improve the weather resistance of the steel, but can also reduce the weldability of the steel, increase the cold brittleness tendency of the steel and generate more serious center segregation.
In the embodiment of the application, S is less than or equal to 0.005%, and S with a higher mass fraction can reduce the corrosion resistance, the low-temperature toughness and the Z-direction performance of the steel.
In the embodiment of the application, the mass fraction of Si is 0.02-0.50%, the addition of Si can improve the corrosion resistance of steel materials, in the marine environment, the increase of the mass fraction of Si in a steel matrix can increase the proportion of superparamagnetic alpha-FeOOH, so that the average grain size of goethite is reduced, and the reduction of the grain size of alpha-FeOOH can enhance the protection capability of a rust layer so as to reduce the corrosion rate of carbon steel. However, in an industrial atmosphere, the main existing form of the Si element in the rust layer may be Fe2SiO4It is loose and porous and cannot block O2、HSO3 -The entering of the corrosion medium finally leads to the reduction of the rust protection capability, and the increase of the mass fraction of Si from 0.2% to 0.8% causes the phenomenon that the corrosion resistance of the steel is deteriorated. Meanwhile, Si is a deoxidizer, the deoxidizing effect of the deoxidizer is stronger than that of manganese, and when the mass fraction of silicon is lower, the deoxidizer can be dissolved in ferrite and austenite to improve the hardness and strength of steel without obviously influencing the plasticity and toughness. However, since the binding ability with oxygen is stronger than that of iron, low melting point silicate is easily generated during welding, fluidity of slag and molten metal is increased, and the welding performance of steel is deteriorated by adding too much Si element. Therefore, in the present invention, the upper limit of Si for the weather-resistant bridge steel used in an industrial atmospheric environment may be set to 0.20%, and the lower limit of Si may be set to 0.01% because a certain amount of Si remains in the steel due to deoxidation. The preferable mass fraction of Si is 0.05-0.20%.
In the embodiment of the application, the mass fraction of Cu can be 0.20-0.60%, the Cu can improve the hardenability of steel, the core strength of a thick steel plate can be obviously improved, and the Cu is also an important element for improving the weather resistance, the Cu element can improve the quality of a rust layer by enriching at the defects such as gaps, holes and the like of the rust layer, but when the addition amount of the Cu is more than 0.50%, the toughness of a welding heat affected zone of the steel plate can be reduced, and the net cracking is easy to generate in the heating process of a steel billet. The mass fraction of Cu is preferably 0.30 to 0.60%.
In the embodiment of the application, the mass fraction of Cr can be 0.20-0.80%, the proper Cr can improve the strength of steel and obviously improve the weather resistance of the steel, but the mass fraction is too high, and if the mass fraction exceeds 0.80%, the welding difficulty is easily increased, and if the mass fraction is singly added or is less than 0.30%, a passive film cannot be formed, so that the corrosion-induced sensitivity of a steel matrix cannot be reduced. The preferable mass fraction of Cr is 0.30 to 0.60%.
In the embodiment of the application, the mass fraction of Ni can be 0.10-0.80%, the Ni can improve hardenability, has a certain strengthening effect, and can also obviously improve the low-temperature toughness of the base metal and the welding HAZ. The addition of Ni can improve the corrosion resistance of steel, which can mainly prevent C1 ions from permeating into a rust layer in a marine atmospheric environment, the good marine corrosion resistance can be achieved generally only when the addition amount reaches 3%, but in an industrial atmospheric environment, the enrichment change of Ni in the rust layer is not large when the addition amount of Ni is increased, but the production cost is increased when the mass fraction is too high, the cost of Ni per ton of steel added with alloy elements is far higher than that of Cu and Cr (0.1% of Ni is 2 times that of Cu and 5 times that of Cr), and in the industrial atmospheric environment with the corrosion grade below C3, the good corrosion resistance can be ensured by Ni elements within 0.8%. For high-strength bridge steel, if the addition amount of Ni is less than 0.30%, the effect of improving the low-temperature toughness is not obvious. The mass fraction of Ni is preferably 0.20 to 0.40%.
As an alternative embodiment, the bridge steel chemical composition comprises, in mass fraction: c: 0.04-0.08%, Si: 0.05-0.20%, Mn: 0.80-1.60%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Cr: 0.30-0.60%, Ni: 0.20-0.40%, Cu: 0.30-0.60%, Als: 0.015 to 0.050%, and the balance of Fe and inevitable impurities.
In the embodiment of the application, the corrosion rate of 690 MPa-grade low-silicon industrial atmospheric corrosion resistant bridge steel relative to Q345B can be less than or equal to 40%, and the corrosion resistance is improved by 40% compared with that of the traditional Corten-A steel.
As an alternative embodiment, the properties of the bridge steel include a yield strength of 690MPa or more and a tensile strength of 820! 920MPa, and the yield ratio can be 0.75-0.8.
In the embodiment of the application, the properties of the bridge steel also comprise that the elongation can be more than or equal to 18%, and the impact value at minus 40 ℃ can be more than or equal to 150J, so that the problem of material selection and material use in the development of bridge engineering towards a large-span and heavy-load direction is solved.
As an alternative embodiment, the metallographic structure of the bridge steel comprises, in volume fraction, 85 to 90% bainite and 10 to 15% ferrite.
As an alternative embodiment, the bainite micro-domain electrode potential difference may be 15-25 mv.
In the embodiment of the application, the obtained bainite structure has good uniformity, the potential difference of the micro-area electrode is small, the corrosion resistance is enhanced, and the production cost is reduced on the premise of ensuring the excellent industrial atmospheric corrosion resistance of the product. The potential of the micro-area electrode is measured by a micro-area electrochemical test method: a capillary three-electrode system is adopted, wherein a steel sample to be detected is used as a working electrode, a reference electrode is a self-made Ag/AgCl microelectrode, and an auxiliary electrode is a platinum wire electrode. The three-electrode system, the body type microscope and the electrochemical workstation are used for measuring the potentiodynamic polarization curves of different micro-area phases.
A method for preparing the bridge steel, as shown in fig. 1, comprises the following steps:
s1, obtaining a casting blank containing the chemical components,
s2, heating, rough rolling, finish rolling, sectional cooling and tempering are sequentially carried out on the casting blank to obtain the bridge steel;
the final cooling temperature of the sectional cooling can be 100-300 ℃.
In the embodiment of the application, the final cooling temperature of the sectional cooling is controlled, so that the steel plate is rapidly cooled to 100-300 ℃ from about 750 ℃, the transformation of the hard phase structure of the base material is ensured, the final metallographic structure is bainite, and the performance of the steel is ensured.
As an optional embodiment, the segmented cooling sequentially comprises a first cooling and a second cooling, and the rate of the first cooling can be 1-2 ℃/s; the second cooling rate can be 15-35 ℃/s.
In the embodiment of the application, the segmented cooling speed is controlled to ensure that a proper ferrite structure is obtained in the base material, the first cooling speed is 1-2 ℃/s, the first cooling speed is too large and too large, and the ferrite volume ratio is too large, too small and too large.
The second cooling rate can be 15-35 ℃/s, and the hard phase structure in the steel cannot be transformed due to the low cooling rate.
As an optional embodiment, the initial rolling temperature of the finish rolling is 935-835 ℃, and the final rolling temperature is 750-820 ℃.
In the embodiment of the application, the initial rolling temperature of finish rolling is controlled to be 920-835 ℃, and the final rolling temperature is controlled to be 750-820 ℃; preferably, the finish rolling initial rolling temperature is 935-820 ℃, and the finish rolling temperature is 770-810 ℃, because too high initial rolling temperature is easy to cause mixed crystal, too low initial rolling temperature cannot ensure effective finish rolling temperature, when the finish rolling temperature is too high or too low, the required hard and soft complex phase structure is not easy to generate, and the obdurability of the steel can be influenced.
As an alternative embodiment, the tempering temperature may be 180-380 ℃.
In the embodiment of the application, the tempering temperature can be 180-380 ℃, the temperature is too high, the bainite gradually merges and grows, the width of the lath is increased, the tensile strength and the impact toughness are reduced, and the lower tempering temperature can obtain the steel with high strength, high toughness and low yield ratio; too short a time is not sufficient to reduce the residual stress in the steel. The tempering can be carried out at the temperature for 20-40 min.
Use of bridge steel, including use of the bridge steel in construction.
Use of bridge steel, said use comprising bare use in an industrial atmospheric environment of environmental corrosion class C1-C3.
In order to better explain the invention, the invention is described in further detail with reference to specific examples, but the invention is not limited to the following examples.
The production process is adopted to prepare 690 MPa-grade low-silicon low-cost industrial atmospheric corrosion resistant bridge steel, and a cycle immersion corrosion test is carried out for 72 hours according to the periodic immersion corrosion test method for weathering steel for railways TB/T2375. The chemical compositions and the results of the immersion corrosion of each example and comparative example 1 (ordinary steel Q345B) and comparative example 2 (conventional weathering steel Corten A steel) are shown in Table 1 and FIG. 3; the metallographic structure diagram of the example 1 of the present application is shown in fig. 1, which illustrates the structure of the metallographic structure in the example of the present application; fig. 2 is a graph showing the relative corrosion rates of examples and comparative examples 1 (ordinary steel Q345B) and 2 (conventional weathering steel Corten a steel), which are lower than those of comparative example 1 (ordinary steel Q345B) and 2 (conventional weathering steel Corten a steel), and thus shows that the bridge steel of the examples has more excellent corrosion resistance.
Table 1 chemical composition and peri-immersion corrosion results of each example and comparative example 1 (ordinary steel Q345B) and comparative example 2 (conventional weathering steel Corten a steel).
In table 1, by controlling the chemical composition of the bridge steel of the examples of the present application, the chemical composition of C, M, P, S, Cu, Cr and Ni is different from that of the steel products of Q345B and Corten a in the comparative examples, and the relative corrosion rate of the examples of the present application is lower than that of comparative example 1 (ordinary steel Q345B) and comparative example 2 (conventional weathering steel Coften a steel), indicating that the bridge steel of the examples of the present application has more excellent corrosion resistance. Corten A was chosen as the comparative steel because it is the most classical weathering steel, indicating that the steel grade of the present application is even better corrosion resistant than Corten A.
One or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:
(1) the 690 MPa-grade low-silicon low-cost industrial atmospheric corrosion resistant bridge steel provided by the embodiment of the application has the strength of 680MPa, and is superior to 500MPa of the traditional bridge steel.
(2) The 690 MPa-grade low-silicon low-cost industrial atmospheric corrosion resistant bridge steel in the embodiment of the application adopts a TMCP process, so that the production cost is reduced, and the production period is shortened.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A 690MPa grade low silicon corrosion resistant bridge steel, characterized in that the bridge steel chemical composition comprises in mass fraction: c is less than or equal to 0.10%, Si: 0.02 to 0.5%, Mn: 0.80-2.00%, P is less than or equal to 0.030%, S is less than or equal to 0.005%, Cr: 0.20-0.80%, Ni: 0.10-0.80%, Cu: 0.20-0.60%, Als: 0.010-0.050%, and the balance of Fe and inevitable impurities.
2. The bridge steel according to claim 1, wherein the bridge steel chemical composition comprises, in mass fractions: c: 0.04-0.08%, Si: 0.05-0.20%, Mn: 0.80-1.60%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Cr: 0.30-0.60%, Ni: 0.20-0.40%, Cu: 0.30-0.60%, Als: 0.015 to 0.050% and the balance of Fe and inevitable impurities.
3. The bridge steel according to claim 1 or 2, wherein the metallographic structure of the bridge steel comprises, in volume fraction, 85-90% bainite and 10-15% ferrite.
4. The bridge steel according to claim 3, wherein the micro-compartmental electrode potential difference of the bainite is 15-25 mv.
5. The bridge steel according to claim 1 or 2, wherein the properties of the bridge steel include yield strength of 690MPa or more, tensile strength of 820 to 920MPa, and yield ratio of 0.75 to 0.8.
6. A method for producing a bridge steel according to any one of claims 1 to 5, comprising the steps of:
obtaining a casting blank containing the chemical components;
heating, rough rolling, finish rolling, sectional cooling and tempering are sequentially carried out on the casting blank to obtain the bridge steel;
the final cooling temperature of the sectional cooling is 100-300 ℃.
7. The method according to claim 6, wherein the sectional cooling comprises a first cooling and a second cooling in sequence, and the rate of the first cooling is 1-2 ℃/s; the second cooling rate is 15-35 ℃/s.
8. The method of claim 6, wherein the finish rolling is performed at a start rolling temperature of 920-835 ℃ and a finish rolling temperature of 750-820 ℃.
9. The method according to claim 6, wherein the tempering temperature is 180-380 ℃.
10. Use of the bridge steel according to any one of claims 1-5 or the bridge steel prepared by the method according to any one of claims 6-8, including in construction.
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| WO2024082955A1 (en) * | 2022-10-18 | 2024-04-25 | 江苏省沙钢钢铁研究院有限公司 | Corrosion-resistant 460 mpa-grade steel plate and production method therefor |
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| JP2001164334A (en) * | 1999-12-03 | 2001-06-19 | Nippon Steel Corp | Steel for structure purpose excellent in corrosion resistance and corrosion fatigue resistance and producing method therefor |
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| JP2008303424A (en) * | 2007-06-07 | 2008-12-18 | Nippon Steel Corp | Method for producing high-tension steel excellent in weld-cracking resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024082955A1 (en) * | 2022-10-18 | 2024-04-25 | 江苏省沙钢钢铁研究院有限公司 | Corrosion-resistant 460 mpa-grade steel plate and production method therefor |
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| CN113667888B (en) | 2023-03-28 |
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