CN115896613B - High-strength low-cost weather-resistant steel for photovoltaic brackets and preparation method and application thereof - Google Patents
High-strength low-cost weather-resistant steel for photovoltaic brackets and preparation method and application thereof Download PDFInfo
- Publication number
- CN115896613B CN115896613B CN202211337425.2A CN202211337425A CN115896613B CN 115896613 B CN115896613 B CN 115896613B CN 202211337425 A CN202211337425 A CN 202211337425A CN 115896613 B CN115896613 B CN 115896613B
- Authority
- CN
- China
- Prior art keywords
- percent
- steel
- temperature
- equal
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 230000007797 corrosion Effects 0.000 claims abstract description 38
- 238000005260 corrosion Methods 0.000 claims abstract description 38
- 239000000126 substance Substances 0.000 claims abstract description 8
- 230000007613 environmental effect Effects 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 36
- 229910000870 Weathering steel Inorganic materials 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 11
- 238000005496 tempering Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007654 immersion Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 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 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 239000002436 steel type Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000006032 tissue transformation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
- 229910006540 α-FeOOH Inorganic materials 0.000 description 1
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The invention discloses weather-resistant steel for a high-strength low-cost photovoltaic bracket and a preparation method thereof. The weather-resistant steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.10 percent, si: 0.02-0.50%, mn:0.80 to 2.00 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.005 percent, cr:0.20 to 0.80 percent, cu:0.20 to 0.60 percent, W:0.05 to 0.50 percent, als:0.010 to 0.050 percent, and the balance of Fe and unavoidable impurities. The invention replaces the conventional expensive corrosion resistant element Ni by W, reduces the content of Si, ensures the comprehensive properties of steel types such as mechanics, welding and the like, has excellent corrosion resistance, can be exposed for use in the atmospheric environment with the environmental corrosion grade of C1-C3, greatly reduces the cost of the whole life cycle of the bracket, has little environmental pollution and less resource consumption, and has good application value.
Description
Technical Field
The invention belongs to the technical field of weather-resistant steel, and particularly relates to weather-resistant steel for a high-strength low-cost photovoltaic bracket, and a preparation method and application thereof.
Background
With the development of the photovoltaic industry, the steel consumption of the photovoltaic industry is greatly increased, and the northwest region of China becomes a main construction place of a commercial photovoltaic power station due to wide region, sufficient illumination and low construction cost. At present, a traditional hot dip galvanized steel bracket is generally adopted for a photovoltaic bracket under construction, but the traditional hot dip galvanized steel bracket cannot meet the control requirement of projects on engineering cost due to the problems of large environmental pollution, low process efficiency, large consumption, low quality level and the like.
Meanwhile, the material corrosion is widely applied to various fields of social and economic construction, various accidents caused by corrosion are striking eyes and frightening, and the development of social and economic development is seriously influenced. The annual corrosion cost of China is about 3.4% of GDP. The photovoltaic bracket is exposed to the atmosphere for a long time, and corrosion of different degrees can generate corrosion damage of different degrees to the bracket structural member, so that the safety, the reliability and the durability of the bracket structural member are affected. And commercial solar photovoltaic power stations are more built in Gobi wilderness, wind and sand are large, and toughness and wear resistance of the material are also factors which must be considered.
The weather-resistant steel bracket is receiving more and more attention because of the advantages of high corrosion resistance, low cost, more environmental protection and the like. Weathering steel has long been used for steel structures in the united states, japan and europe because of its light weight, low maintenance costs, high construction efficiency, and the like. In the united states, the largest use of weathering steel is to build bridges and expand the use of bare forms, with over 500 buildings of bare weathering steel. In japan, since 1965, exterior parts such as building roofs, shutters, steel bones, exterior panel lamps, and the like have been exposed to use weathering steel.
Therefore, the development of the weather-resistant steel for the photovoltaic bracket with high strength, high corrosion resistance and low cost is an urgent requirement of the photovoltaic industry against the development trend of green low carbon, high strength and corrosion resistance in the photovoltaic industry.
Disclosure of Invention
Aiming at the problems of large environmental pollution, low process efficiency, high consumption, low strength, atmospheric corrosion, sand erosion and the like of a traditional hot-dip galvanized steel photovoltaic bracket in an actual service atmosphere environment, the invention provides weather-resistant steel for a photovoltaic bracket with high strength (yield strength is 690 MPa), low cost and high corrosion resistance, and a preparation method and application thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the weather-resistant steel for the photovoltaic bracket has the following chemical components in percentage by mass: c is less than or equal to 0.10 percent, si: 0.02-0.50%, mn:0.80 to 2.00 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.005 percent, cr:0.20 to 0.80 percent, cu:0.20 to 0.60 percent, W:0.05 to 0.50 percent, als:0.010 to 0.050 percent, and the balance of Fe and unavoidable impurities.
According to the scheme, in the weathering steel, the W content is 0.05-0.20% by mass percent.
According to the scheme, in the weathering steel, the content of Si is 0.05-0.20% by mass percent.
According to the scheme, the weather-resistant steel for the high-strength low-cost photovoltaic bracket comprises the following chemical components in percentage by mass: c:0.03 to 0.06 percent, si:0.05 to 0.20 percent, mn: 1.00-1.80%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, cr:0.50 to 0.60 percent, cu:0.30 to 0.50 percent, W:0.05 to 0.20 percent, als:0.015 to 0.050 percent, and the balance of Fe and unavoidable impurities.
According to the scheme, a week immersion corrosion test is carried out for 168 hours by using TB/T2375, and the relative corrosion rate of the obtained weathering steel is less than or equal to 45 percent.
According to the scheme, the yield strength of the weather-resistant steel for the high-strength low-cost photovoltaic bracket is more than or equal to 690MPa, the tensile strength is 820-920 MPa, the elongation is more than or equal to 18%, and the low-temperature impact energy is more than or equal to 200J.
The function of each element in the invention:
the content of C in the invention is less than or equal to 0.10 percent. C is an effective element for improving the strength of steel, and when the carbon content is high, for example, exceeds 0.12%, martensite is extremely liable to be formed to deteriorate the low-temperature toughness of steel, and the tensile strength is liable to exceed the upper limit, so that the influence on weldability is more remarkable. When the carbon content in the steel is below 0.10% (wt), the sensitivity of the carbon equivalent of the steel to weld cold cracks is not great, the carbon content is reduced, and the low-temperature toughness of the steel can be effectively improved. However, when the carbon content is too low, for example, less than 0.03%, the strength of the steel sheet is insufficient, the hard phase in the steel is less, and the yield ratio control is difficult. The preferable content of C is 0.03-0.06%.
The Mn content of the invention is 0.80-2.00%, mn is an important strengthening element, is an austenite stabilizing element, can enlarge an austenite region in an iron-carbon phase diagram, and promotes medium-temperature tissue transformation. The higher content of Mn is extremely liable to cause serious center segregation in the steel, deteriorating the low temperature toughness of the steel, and the steel sheet HAZ is liable to crack during welding, and is also unnecessary for obtaining the mechanical properties of the steel of the present invention, while too low Mn is liable to lower the strength of the steel. The Mn content is preferably 1.00 to 1.80%.
The P content is less than or equal to 0.010%, the weather resistance of the steel can be obviously improved by the P with higher content, but the weldability of the steel can be reduced, the cold embrittlement tendency of the steel is increased, and serious center segregation is generated.
The S content is less than or equal to 0.005%, and the higher S content can reduce the corrosion resistance, low-temperature toughness and Z-direction performance of the steel.
The Si content of the invention is 0.02-0.50%, and the addition of Si element can improve the corrosion resistance of steel materials. In marine environment, the increase of silicon content in the steel matrix can increase the proportion of superparamagnetic alpha-FeOOH, and enhance the protection capability of the rust layer, so that the corrosion rate of carbon steel is reduced. However, in the industrial atmosphere, the main existence form of Si element in the rust layer is Fe 2 SiO 4 It is porous and does not prevent O 2 、HSO 3 - The entering of the equal corrosion medium eventually leads to the phenomenon that the rust protection capability is reduced, and the Si content is increased from 0.2% to 0.8%, so that the corrosion resistance of the steel is deteriorated. Meanwhile, because the binding capacity of the alloy with oxygen is stronger than that of iron, silicate with low melting point is easy to generate during welding, the fluidity of slag and molten metal is increased, and the addition of excessive Si element can reduce the welding performance and impact toughness of steel. Therefore, in the present invention, the upper limit of Si is set to 0.20%, and a certain amount of Si remains in the steel due to deoxidation, so the lower limit of Si is set to 0.01%. Taking into account the yield ratio,The preferable Si content is 0.05-0.20% for the comprehensive performance such as impact energy and elongation.
The Cu content of the invention is 0.20-0.60%, cu can improve the hardenability of steel, can obviously improve the core strength of a thick steel plate, is also an important element for improving weather resistance, improves the quality of a rust layer by enriching Cu at defects such as gaps, holes and the like of the rust layer, but when the Cu addition is more than 0.50%, the toughness of a welding heat affected zone of the steel plate is reduced, and network cracks are easy to generate in the heating process of a steel billet. The most preferable Cu content is 0.30 to 0.50%.
The content of Cr in the invention is 0.20-0.80%, the proper Cr can improve the strength of the steel, obviously improve the weather resistance of the steel, but if the content exceeds 0.80%, the welding difficulty is easy to increase, and when the Cr is singly added or less than 0.30%, a passivation film is not formed, the corrosion induction sensitivity of a steel matrix cannot be reduced, and compared with the traditional Ni and Cu elements, the cost of Cr is lower, and the corrosion resistance is obviously improved. The preferable Cr content is 0.50 to 0.60%.
The content of W in the invention is 0.05-0.50%. The traditional weathering steel can be added with Ni element to improve corrosion resistance, but the corrosion resistance can be better only when the adding amount reaches a certain amount (3% of marine environment and 1% of industrial atmosphere), and the cost of Ni of ton steel added with alloy elements is far higher than that of Cu and Cr (each time 0.1% of Ni is added, the cost of Ni is 2 times of Cu and 5 times of Cr). In addition, commercial solar photovoltaic power stations are more built in gobi wild, wind and sand is large, wind and sand erosion is serious, the melting point of W is the highest in all metals, the hardness is also high, the commercial solar photovoltaic power stations are often used for producing heat-strength and wear-resistant alloy, and the wind and sand erosion resistance of the metals can be improved by adding a proper amount of W. The preferable W content is 0.05 to 0.20%.
The invention also provides a preparation method of the weather-resistant steel for the high-strength low-cost photovoltaic bracket, which adopts a TMCP process and comprises the following steps: heating a casting blank, rough rolling, finish rolling, sectional cooling, tempering and cooling.
According to the above-mentioned scheme, the above-mentioned method,
the initial rolling temperature of the finish rolling is 950-850 ℃, and the final rolling temperature is 750-820 ℃;
control the first stage when cooling in stages: the cooling rate is 2-4 ℃/s, and the temperature is cooled to 620-680 ℃; and a second stage: the cooling rate is 20-35 ℃/s, so that the steel plate is rapidly cooled to 100-300 ℃;
the tempering temperature is 150-400 ℃, and the temperature is kept for 20-40 min.
According to the scheme, the heating temperature of the casting blank is 1180-1270 ℃.
According to the scheme, the initial rolling temperature of rough rolling is 1060-1100 ℃, and the final rolling temperature is 930-970 ℃.
According to the scheme, the finish rolling temperature is 920-870 ℃ at the beginning and 770-810 ℃ at the end.
According to the scheme, the tempering temperature is 200-320 ℃, and the temperature is kept for 22-28 min.
The invention also provides application of the weather-resistant steel for the high-strength low-cost photovoltaic bracket in the field of photovoltaic building or bridge construction.
According to the scheme, the weathering steel is exposed to the atmosphere with the environmental corrosion grade of C1-C3.
The weathering steel for the high-strength low-cost photovoltaic bracket adopts a TMCP process, so that the production cost is reduced, and the production period is shortened; wherein:
controlling the initial rolling temperature of the finish rolling to be 950-850 ℃ and the final rolling temperature to be 750-820 ℃; the mixed crystal is easily caused by the excessively high starting rolling temperature, the effective finishing rolling temperature cannot be ensured by the excessively low starting rolling temperature, the required hard and soft complex phase structure is not easy to generate when the finishing rolling temperature is excessively high or excessively low, and the toughness of the steel can be influenced.
Control the first stage when cooling in stages: the cooling rate is 2-4 ℃/s, so that proper ferrite and bainite tissues are obtained in the steel; and a second stage: the cooling rate is 20-35 ℃/s, so that the steel plate is rapidly cooled to 100-300 ℃ to ensure the transformation of the hard phase structure of the base material.
The tempering temperature is controlled to be 150-400 ℃, and the temperature is kept for 20-40 min, so that the residual stress of the steel plate is reduced, and the yield ratio is not too high.
The beneficial effects of the invention are as follows:
1. the invention provides the weather-resistant steel for the high-strength low-cost photovoltaic bracket, wherein W is adopted to replace the conventional expensive corrosion-resistant element Ni, so that the cost of the steel grade is greatly reduced, and the capability of the steel grade for resisting wind and sand erosion is improved; meanwhile, the content of Si is reduced, so that corrosion resistance deterioration caused by overhigh content of Si is avoided, and comprehensive performances such as mechanics, welding and the like of the steel are ensured. The yield strength of the obtained weathering steel is more than or equal to 690MPa, the tensile strength is 850-950 MPa, the yield ratio is 0.72-0.80, the thickness of the bracket can be reduced while the strength is improved, the steel consumption of a unit bracket is greatly reduced, the cost is obviously reduced, and the weathering steel has wide application prospect.
2. The weather-resistant steel for the high-strength low-cost photovoltaic bracket provided by the invention can be exposed and used in the atmospheric environment with the environmental corrosion grade of C1-C3, and compared with the traditional hot galvanizing photovoltaic bracket, the weather-resistant steel for the high-strength low-cost photovoltaic bracket greatly reduces the cost of the full life cycle of the bracket, has the advantages of less environmental pollution and less resource consumption, and has good application value.
Drawings
FIG. 1 is a metallographic structure of example 6 of the present invention.
FIG. 2 shows the results of corrosion resistance tests of examples and comparative examples of the present invention.
Detailed Description
In order to better explain the present invention, the present invention will be described in further detail with reference to the following specific examples, but the present invention is not limited to the following examples.
Examples 1 to 6
The chemical components and the mass percentage of the weather-resistant steel for the high-strength low-cost photovoltaic bracket in the embodiment of the invention are shown in the table 1.
The TMCP process for preparing the weather-resistant steel for the high-strength low-cost photovoltaic bracket comprises the following steps: heating a casting blank, rough rolling, finish rolling, sectional cooling, tempering and cooling; wherein:
the heating temperature of the casting blank is 1250+/-20 ℃;
the initial rolling temperature is 1080+/-20 ℃, and the final rolling temperature is 950+/-20 ℃;
the initial rolling temperature of the finish rolling is 900+/-20 ℃, and the final rolling temperature is 790+/-20 ℃;
control the first stage when cooling in stages: the cooling rate is 2-4 ℃/s, and the temperature is cooled to 650+/-20 ℃; and a second stage: the cooling rate is 20-35 ℃/s, so that the steel plate is rapidly cooled to 100-300 ℃;
the tempering temperature is 200-300 ℃, and the temperature is kept for 28min.
Comparative examples 1 to 2
Comparative example 1 is plain steel Q345B; comparative example 2 is a conventional weathering steel SPA-H steel, and the specific chemical compositions and mass percentages thereof are shown in Table 1.
The period immersion corrosion test was carried out for 168 hours according to TB/T2375, method for periodic immersion corrosion test of weathering resistant Steel for railway. The peri-immersion corrosion results for each of examples and comparative examples 1-2 are shown in Table 1 and FIG. 2 below.
TABLE 1 chemical composition and comparative examples 1-6 and comparative examples 1-2 comparative dip corrosion
Compared with common carbon steel (Q345B), the weathering steel for the high-strength low-cost photovoltaic bracket, which is obtained by the embodiment of the invention, has the advantages that the corrosion rate is reduced by 60%, the corrosion resistance is improved by 35% compared with the traditional weathering steel (SPA-H), the cost is reduced by 15% compared with the traditional weathering steel (SPA-H), and the comprehensive cost is reduced by 20% compared with the traditional hot galvanizing photovoltaic bracket.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (8)
1. The weather-resistant steel for the high-strength low-cost photovoltaic bracket is characterized by comprising the following chemical components in percentage by mass: c is less than or equal to 0.10 percent, si: 0.02-0.50%, mn:0.80 to 2.00 percent, P is less than or equal to 0.030 percent, S is less than or equal to 0.005 percent, cr:0.20 to 0.80 percent, cu:0.20 to 0.60 percent, W:0.05 to 0.50 percent, als:0.010 to 0.050 percent, and the balance of Fe and unavoidable impurities; wherein:
performing a week immersion corrosion test for 168 hours by using TB/T2375, wherein the relative corrosion rate of the obtained weathering steel is less than or equal to 45%; the yield strength of the weathering steel is more than or equal to 690MPa, the tensile strength is 820-920 MPa, the elongation is more than or equal to 18%, and the low-temperature impact energy is more than or equal to 200J;
the preparation of the weathering steel adopts a TMCP process, and comprises the following steps: heating a casting blank, rough rolling, finish rolling, sectional cooling, tempering and cooling; the method comprises the following steps: the initial rolling temperature of the finish rolling is 950-850 ℃, and the final rolling temperature is 750-820 ℃; control the first stage when cooling in stages: the cooling rate is 2-4 ℃/s, and the temperature is cooled to 620-680 ℃; and a second stage: the cooling rate is 20-35 ℃/s, so that the steel plate is rapidly cooled to 100-300 ℃; the tempering temperature is 150-400 ℃, and the temperature is kept for 20-40 min.
2. The weathering steel according to claim 1, wherein the W content in mass percent is 0.05-0.20%.
3. The weathering steel according to claim 1, characterized in that the Si content in mass percent is 0.05-0.20%.
4. The weathering steel according to claim 1, wherein the high-strength low-cost weathering steel for photovoltaic brackets comprises the following chemical components in percentage by mass: c:0.03 to 0.06 percent, si:0.05 to 0.20 percent, mn: 1.00-1.80%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, cr:0.50 to 0.60 percent, cu:0.30 to 0.50 percent, W:0.05 to 0.20 percent, als:0.015 to 0.050 percent, and the balance of Fe and unavoidable impurities.
5. A method for preparing the weather resistant steel for the high-strength low-cost photovoltaic bracket according to any one of claims 1 to 4, which is characterized by adopting a TMCP process and comprising the following steps: heating a casting blank, rough rolling, finish rolling, sectional cooling, tempering and cooling; wherein: the initial rolling temperature of the finish rolling is 950-850 ℃, and the final rolling temperature is 750-820 ℃; control the first stage when cooling in stages: the cooling rate is 2-4 ℃/s, and the temperature is cooled to 620-680 ℃; and a second stage: the cooling rate is 20-35 ℃/s, so that the steel plate is rapidly cooled to 100-300 ℃; the tempering temperature is 150-400 ℃, and the temperature is kept for 20-40 min.
6. The method according to claim 5, wherein the casting blank is heated at 1180 to 1270 ℃; the initial rolling temperature of rough rolling is 1060-1100 ℃ and the final rolling temperature is 930-970 ℃.
7. Use of the weathering steel for high strength low cost photovoltaic brackets of any one of claims 1-4 in photovoltaic construction or bridge construction.
8. The use according to claim 7, wherein the weathering steel is exposed for use in atmospheric environments of environmental corrosion class C1-C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211337425.2A CN115896613B (en) | 2022-10-28 | 2022-10-28 | High-strength low-cost weather-resistant steel for photovoltaic brackets and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211337425.2A CN115896613B (en) | 2022-10-28 | 2022-10-28 | High-strength low-cost weather-resistant steel for photovoltaic brackets and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115896613A CN115896613A (en) | 2023-04-04 |
| CN115896613B true CN115896613B (en) | 2024-03-01 |
Family
ID=86496520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211337425.2A Active CN115896613B (en) | 2022-10-28 | 2022-10-28 | High-strength low-cost weather-resistant steel for photovoltaic brackets and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115896613B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007186738A (en) * | 2006-01-11 | 2007-07-26 | Kobe Steel Ltd | Weather resistant steel sheet having excellent toughness in weld heat-affected zone |
| CN102127717A (en) * | 2010-01-18 | 2011-07-20 | 宝山钢铁股份有限公司 | Cr-contained weathering steel with excellent toughness and high corrosion resistance |
| 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 |
| CN106987772A (en) * | 2017-04-28 | 2017-07-28 | 武汉钢铁有限公司 | High-strength fireproof weathering steel and its production method |
| CN111676427A (en) * | 2020-07-30 | 2020-09-18 | 攀钢集团研究院有限公司 | 590MPa grade high-corrosion-resistance weathering steel and preparation method thereof |
| CN111850418A (en) * | 2020-07-30 | 2020-10-30 | 攀钢集团研究院有限公司 | 630MPa grade high-corrosion-resistance weathering steel and preparation method thereof |
| CN114807760A (en) * | 2022-04-28 | 2022-07-29 | 湖南华菱湘潭钢铁有限公司 | Tungsten-containing sulfuric acid dew point corrosion resistant steel and production method thereof |
-
2022
- 2022-10-28 CN CN202211337425.2A patent/CN115896613B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007186738A (en) * | 2006-01-11 | 2007-07-26 | Kobe Steel Ltd | Weather resistant steel sheet having excellent toughness in weld heat-affected zone |
| CN102127717A (en) * | 2010-01-18 | 2011-07-20 | 宝山钢铁股份有限公司 | Cr-contained weathering steel with excellent toughness and high corrosion resistance |
| 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 |
| CN106987772A (en) * | 2017-04-28 | 2017-07-28 | 武汉钢铁有限公司 | High-strength fireproof weathering steel and its production method |
| CN111676427A (en) * | 2020-07-30 | 2020-09-18 | 攀钢集团研究院有限公司 | 590MPa grade high-corrosion-resistance weathering steel and preparation method thereof |
| CN111850418A (en) * | 2020-07-30 | 2020-10-30 | 攀钢集团研究院有限公司 | 630MPa grade high-corrosion-resistance weathering steel and preparation method thereof |
| CN114807760A (en) * | 2022-04-28 | 2022-07-29 | 湖南华菱湘潭钢铁有限公司 | Tungsten-containing sulfuric acid dew point corrosion resistant steel and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115896613A (en) | 2023-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102240599B1 (en) | Highly Corrosion-resistant, High Strength, Al-containing Weathering Steel Plate and Process of Manufacturing Same | |
| WO2014201887A1 (en) | Ht550 steel plate with ultrahigh toughness and excellent weldability and manufacturing method therefor | |
| CN109628840B (en) | 550 MPa-grade cold-rolled corrosion-resistant dual-phase steel and manufacturing method thereof | |
| CN112813360B (en) | Low-carbon Cr-Ni-Al series high-strength and high-toughness corrosion-resistant steel and preparation method thereof | |
| WO2023241665A1 (en) | High-strength and high-plasticity hot-rolled strip steel with high weather resistance and manufacturing method therefor | |
| CN110578085A (en) | Hot-rolled steel plate with yield strength of 500MPa and atmospheric corrosion resistance | |
| CN111057812A (en) | High-toughness fire-resistant corrosion-resistant steel with 600MPa tensile strength and manufacturing method thereof | |
| JP2022027527A (en) | 630 MPa GRADE HIGH CORROSION-RESISTANT WEATHER-RESISTANT STEEL AND METHOD FOR PRODUCING THE SAME | |
| CN104313486A (en) | Atmospheric corrosion-resistant steel and production process thereof | |
| CN110952035A (en) | High-strength low-carbon low-alloy steel for buildings and preparation process thereof | |
| CN114892090A (en) | Production method of Q550-grade high-corrosion-resistance high-strength offshore structure steel | |
| CN115896613B (en) | High-strength low-cost weather-resistant steel for photovoltaic brackets and preparation method and application thereof | |
| CN111850411A (en) | 400 MPa-grade high-chromium weathering steel and preparation method thereof | |
| CN103849820A (en) | High-strength corrosion-resistant rebar containing Cr and rolling process thereof | |
| CN115161551B (en) | High-strength high-formability super-atmospheric corrosion-resistant steel and manufacturing method thereof | |
| CN113667888B (en) | 690 MPa-grade low-silicon corrosion-resistant bridge steel and preparation method thereof | |
| JP7233482B2 (en) | 540 MPa grade high silicon high chromium weathering steel and its manufacturing method | |
| CN114763593B (en) | Marine engineering steel with high humidity and heat atmosphere corrosion resistance and manufacturing method thereof | |
| CN114807785A (en) | 390 MPa-grade corrosion-resistant steel plate and production method thereof | |
| CN111057968B (en) | Corrosion-resistant hot-rolled steel plate for street lamp pole and preparation method thereof | |
| CN110004358B (en) | Marine steel plate with low Pcm value, large thickness and easy welding and production method thereof | |
| CN113512682A (en) | High-strength and high-toughness ultra-thick quenched and tempered hydroelectric steel plate and preparation method thereof | |
| CN115261723B (en) | Hot-rolled dual-phase high corrosion-resistant steel plate with 650 MPa-level tensile strength and manufacturing method thereof | |
| CN115747637B (en) | Economical ocean atmospheric corrosion resistant steel and production method thereof | |
| CN118086796A (en) | High-strength high-weather-resistance steel for low-cost photovoltaic bracket in industrial ocean atmospheric environment and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |