CN107502835B - High-strength high-toughness weather-resistant angle steel for iron tower and preparation method thereof - Google Patents
High-strength high-toughness weather-resistant angle steel for iron tower and preparation method thereof Download PDFInfo
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- CN107502835B CN107502835B CN201710705302.2A CN201710705302A CN107502835B CN 107502835 B CN107502835 B CN 107502835B CN 201710705302 A CN201710705302 A CN 201710705302A CN 107502835 B CN107502835 B CN 107502835B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 238000009749 continuous casting Methods 0.000 claims description 24
- 238000005096 rolling process Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910000746 Structural steel Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 abstract description 16
- 238000005260 corrosion Methods 0.000 abstract description 16
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 4
- 238000010923 batch production Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 16
- 239000010955 niobium Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 229910000870 Weathering steel Inorganic materials 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 5
- 238000005452 bending Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000005536 corrosion prevention Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention provides high-strength high-toughness weather-resistant angle steel for an iron tower and a preparation method thereof. The high-strength high-toughness weather-resistant angle steel for the iron tower comprises the following components in percentage by weight: c: 0.05% -0.10%, Si: 0.15% -0.40%, Mn: 1.10-1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, Cr: 0.40% -1.00%, Ni: 0.30% -0.40%, Cu: 0.30-0.40%, Als is more than or equal to 0.015%, N: 0.02% -0.07%, Nb: 0.01% -0.04%, Ti: 0.01% -0.05%, V: 0.03 to 0.08 percent of the total weight of the alloy, and the balance of Fe. The invention also provides a preparation method of the high-strength high-toughness weather-resistant angle steel for the iron tower. The invention has the advantages that the hot-rolled weather-resistant angle steel for the iron tower with high strength, low temperature, high toughness and atmospheric corrosion resistance is obtained through the combined design of alloy elements, and the method can be used for batch production under the condition of the existing angle steel production equipment.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to high-strength high-toughness weather-resistant angle steel for an iron tower and a preparation method thereof.
Background
The iron tower of the power transmission line in China mainly selects hot-rolled angle steel sections for a long time, a small amount of steel pipes are used as tower materials, the currently used brands are mainly Q235, Q345 and Q420, the power transmission iron tower in the developed countries in China is mainly manufactured by Q400, Q450 and Q500 grade angle steels, and compared with the developed countries, the iron tower of the power transmission line in China has few varieties and low strength value. The ultra/extra-high voltage transmission line iron tower tends to be large-sized, the design load of the tower is larger and larger, and the common hot-rolled angle steel cannot meet the use requirements of the tower with large load in strength and specification. When the structural member is designed to have a large load, the bearing capacity requirement of the iron tower structural member is generally met by adopting a combined section method, so that the number and the specification of iron tower rod pieces are increased, the node structure is complex, the installation workload is increased, the engineering investment is increased, a large amount of resources are wasted, and the strength grade of steel selected by engineering is promoted to be developed to a higher level. According to statistical data, under the same load design, the Q460 grade angle steel is used for replacing the Q345 grade angle steel, so that the steel consumption can be averagely reduced by about 10%.
In a low-temperature environment, a low-stress brittle fracture phenomenon may occur in a power transmission iron tower due to a low-temperature cold-embrittlement effect of steel. The extra-high voltage alternating current same-tower multi-circuit line has large transmission capacity, high importance level and higher requirement on steel quality level. The test temperature and the impact absorption energy of the Charpy (V-type) impact test of the Q345B steel material were 20 ℃ and not less than 34J, respectively. The lowest temperature of an extra-high voltage alternating current line passing through a local area (such as inner Mongolia and the like) is lower than-40 ℃, the requirement on the quality grade of steel is higher, and Q345B is difficult to meet the requirement on low-temperature steel, so that hidden danger is brought to long-term safe operation of a power transmission iron tower in a cold area.
In the manufacturing process of the power transmission iron tower adopting carbon steel and low-alloy structural steel, hot galvanizing is applied for corrosion prevention. The galvanization corrosion prevention needs special procedures of rust removal, acid cleaning and galvanization, so that the manufacturing cost of the iron tower is increased, and the environment is polluted. With the continuous improvement of the construction level of a power grid and the application of new power transmission technologies such as multi-loop, compact line and multi-split large-section wire on the same tower, the tower load is larger and larger, the self weight of the iron tower is larger and larger (from 1-2 tons of single-base tower weight to 5000 tons of maximum single-base tower weight), and the problems of material waste, increased maintenance cost and environmental pollution caused by the specific rust removal, acid pickling and galvanizing procedures of galvanizing corrosion prevention are urgently needed to be solved. The application of new energy-saving and environment-friendly materials, new processes and new technologies is a necessary trend for the construction and development of power grids.
The weathering steel has the characteristics of environmental protection, energy conservation, long service life and the like, has the performances of high strength, high toughness and the like, and is widely applied to the fields of tanks, vehicles, buildings, bridges and the like. The corrosion resistance of the weathering steel is improved by adding alloy elements such as P, Cu, Cr, Ni and the like. When the weathering steel is used, the surface of the steel plate is in contact with corrosive atmosphere, elements such as P, Cu, Cr, Ni and the like are enriched on the surface of the steel plate through electrochemical action and react with oxygen and moisture in the air to generate compact amorphous spinel oxide on the surface of the weathering steel, protect a steel substrate, prevent the corrosive atmosphere from further corroding the steel substrate, achieve higher atmospheric corrosion resistance, have 4-8 times of corrosion resistance of carbon structural steel, and have higher strength, reasonable price and far lower cost than stainless steel, so the weathering steel has wide application prospect. The application of the weather-resistant steel tower in the power transmission line can reduce environmental pollution, reduce steel consumption and processing cost, and has remarkable economic and social benefits.
The cold-bending weather-resistant angle steel of the institute of electrical and power science in China is researched and applied in a pilot test. Research results show that the weather-resistant cold-formed steel adopted in the iron tower of the power transmission line can save the steel consumption, reduce the environmental pollution and obtain remarkable economic and social benefits. The first-base weather-resistant cold-bending steel transmission tower in China is successfully constructed and put into operation in 220kV xiamen self-sown-officer line transmission tower pilot test application engineering. However, two types of defects often appear in the cold-bending weather-resistant angle steel in the actual processing and use process. One is the defect of cutting delamination, when the hot-rolled weather-resistant steel plate is subjected to cold cutting, a cutting fracture is delaminated, and the delamination position is at the center position in the thickness direction of the hot coil plate. Such defects affect the steel sheet during subsequent use, and the corrosion resistance and welding properties thereof are reduced. The other defect is 90-degree cold bending cracking, and after the hot-rolled weather-resistant steel plate is deformed by cold bending, cracking occurs at a bent angle, so that the weather-resistant cold-bent angle steel power transmission tower cannot be expanded and applied on a large scale.
In view of the above, it is necessary to develop hot-rolled weather-resistant angle steel of class Q420, class Q460 or higher having high toughness under low temperature conditions. The extra-high voltage transmission line adopts high-strength high-toughness weather-resistant angle steel, so that the weight of an iron tower can be obviously reduced, resources are effectively saved, the environment is protected, the requirements of steel for transmission towers in low-temperature areas can be met, and the economic and social benefits are better.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide atmospheric corrosion resistant hot-rolled medium and small-sized angle steel with high strength, low temperature and high toughness and a preparation method thereof.
In order to achieve the aim, the invention provides high-strength high-toughness weather-resistant angle steel for an iron tower, which comprises the following components in percentage by weight:
c: 0.05% -0.10%, Si: 0.15% -0.40%, Mn: 1.10-1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, Cr: 0.40% -1.00%, Ni: 0.30% -0.40%, Cu: 0.30-0.40%, Als is more than or equal to 0.015%, N: 0.02% -0.07%, Nb: 0.01% -0.04%, Ti: 0.01% -0.05%, V: 0.03 to 0.08 percent of the total weight of the alloy, and the balance of Fe.
The technical scheme adopted by the high-strength high-toughness weather-resistant angle steel for the iron tower provided by the invention is as follows: low C, high Mn, low S, Nb, V, Ti + Als composite micro-alloying.
The C element has great influence on the strength, low-temperature toughness and welding performance of steel. The content of the C element is controlled to be 0.05-0.10%, so that the strength of the steel can be ensured, and adverse effects on the low-temperature toughness and the welding performance of the steel can be avoided.
The content of Mn element is controlled to be 1.10% -1.50%, the deoxidizing and desulfurizing effects of Mn element in steel can be exerted, part of Mn can be dissolved in ferrite and cementite to improve the strength, meanwhile, the Mn element can also refine the pearlite structure in steel, the content of Mn element in low-carbon steel is improved, and the toughness of the steel can be improved.
The addition of microalloy elements Nb, V and Ti to the steel can significantly improve the strength. The V element can be fully dissolved into the steel material when being heated, and is separated out in the form of fine carbon and nitride in the matrix and grain boundary of the steel material during the cooling process, thereby playing the roles of precipitation strengthening and grain refinement. The Nb element can delay austenite recrystallization during hot rolling to achieve the purpose of grain refinement; compared with large-size angle steel, the cooling speed of the medium and small-size angle steel in the processes of hot rolling and cooling after rolling is slightly higher. By properly controlling the production rhythm and process adjustment, the final rolling temperature of the angle steel can be within a certain range on the traditional hot-rolled angle steel production line, and a small amount of Nb (CN) is dispersed and precipitated to play a role in precipitation strengthening. Ti is a strong carbonitride forming element, and formed TiN and TiC can prevent austenite grains from growing and refine the austenite grains in the heating and soaking processes. Meanwhile, Ti delays the recrystallization of the niobium-containing steel in the controlled rolling process and also plays a role in refining austenite grains.
Als is a solid N element traditionally, and AlN is formed to refine austenite grains.
The P element can improve the strength and hardness, especially the corrosion resistance, of the steel, but reduces the plasticity and the toughness. S is a harmful element in steel, and the low-temperature toughness and the corrosion resistance of the steel are seriously influenced, so that the P, S element content is effectively controlled.
By adding a certain amount of Cu, Cr and Ni elements into the steel, the weather-resistant steel can be ensured to have industrial atmospheric corrosion resistance.
The high-strength high-toughness weather-resistant angle steel for the iron tower provided by the invention has the following preferable components:
the high-strength high-toughness weather-resistant angle steel for the iron tower comprises the following components in percentage by weight: c: 0.081%, Si: 0.25%, Mn: 1.29%, P: 0.010%, S: 0.003%, Cr: 0.46%, Ni: 0.38%, Cu: 0.32%, Als: 0.027%, N: 0.01%, Nb: 0.02%, Ti: 0.021%, V: 0.04% and the balance Fe. Or,
the high-strength high-toughness weather-resistant angle steel for the iron tower comprises the following components in percentage by weight: c: 0.083%, Si: 0.30%, Mn: 1.18%, P: 0.009%, S: 0.002%, Cr: 0.75%, Ni: 0.37%, Cu: 0.31%, Als: 0.024%, N: 0.018%, Nb: 0.03%, Ti: 0.029%, V: 0.05% and the balance Fe.
The invention also provides a preparation method of the high-strength high-toughness weather-resistant angle steel for the iron tower, which comprises the following steps:
1) smelting the components of the high-strength high-toughness weather-resistant angle steel for the iron tower, and carrying out continuous casting to obtain a continuous casting blank, wherein the continuous casting blank is cooled to room temperature by stacking;
2) heating the continuous casting billet, wherein the soaking time of the continuous casting billet is 20-40 min, and the tapping temperature is 1160-1210 ℃;
3) rolling the heated continuous casting blank, wherein the initial rolling temperature is 1120-1180 ℃, the final rolling temperature is 820-860 ℃, and the total compression ratio of the casting blank is more than 6;
4) and air-cooling the rolled angle steel to obtain the high-strength high-toughness weather-resistant angle steel for the iron tower.
The invention has the advantages that the hot-rolled weather-resistant angle steel for the iron tower with high strength, low temperature, high toughness and atmospheric corrosion resistance is obtained through the combined design of alloy elements, and the method can be used for batch production under the condition of the existing angle steel production equipment.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Examples 1 and 2
Embodiments 1 to 2 provide high-strength, high-toughness, weather-resistant angle steel for iron towers, which has the composition shown in table 1, and is prepared by the following steps:
1) smelting the components of the high-strength high-toughness weather-resistant angle steel for the iron tower, and carrying out continuous casting to obtain a continuous casting blank, wherein the continuous casting blank is cooled to room temperature by stacking;
2) heating the continuous casting billet, wherein the soaking time and the tapping temperature of the continuous casting billet are shown in a table 2;
3) rolling the heated continuous casting blank, wherein the initial rolling temperature and the final rolling temperature are shown in a table 2, and the total compression ratio of the casting blank is more than 6;
4) and air-cooling the rolled angle steel to obtain the high-strength high-toughness weather-resistant angle steel for the iron tower.
Other main process parameters in the preparation process are shown in table 2, the mechanical properties are shown in table 3, and the corrosion rate is shown in table 4.
Meanwhile, comparative example 1 can also be prepared by referring to the above procedure, and the relevant contents thereof are also shown in tables 1 to 4.
TABLE 1 composition of ingredients (in weight percent)
TABLE 2 Main Process parameters
TABLE 3 mechanical Properties
The mechanical properties in Table 3 were tested according to GB/T228.1-2010 Metal materials tensile test part 1: the room temperature test method and the Charpy pendulum impact test method of GB/T229-2007 metal materials are carried out.
TABLE 4 Corrosion Properties
The corrosion performance in Table 4 was tested according to TB/T2375-.
The relative corrosion rate results given in table 4 represent the relative corrosion rates of examples 1 and 2 compared to comparative example 1, as can be seen from the data in table 4: the corrosion resistance of the weather-resistant angle steel is far better than that of conventional angle steel.
Claims (4)
1. The high-strength high-toughness weather-resistant angle steel for the iron tower comprises the following components in percentage by weight:
c: 0.05% -0.083%, Si: 0.15% -0.40%, Mn: 1.10-1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, Cr: 0.40% -1.00%, Ni: 0.30% -0.40%, Cu: 0.30-0.40%, Als is more than or equal to 0.015%, N: 0.02% -0.07%, Nb: 0.01% -0.04%, Ti: 0.021% -0.05%, V: 0.03% -0.05%, the rest is Fe;
the high-strength high-toughness weather-resistant angle steel for the iron tower is prepared by the following preparation method, and comprises the following steps:
1) smelting the components of the high-strength high-toughness weather-resistant angle steel for the iron tower, and carrying out continuous casting to obtain a continuous casting blank, wherein the continuous casting blank is cooled to room temperature by stacking;
2) heating the continuous casting billet, wherein the soaking time of the continuous casting billet is 20-40 min, and the tapping temperature is 1160-1210 ℃;
3) rolling the heated continuous casting blank, wherein the initial rolling temperature is 1120-1180 ℃, the final rolling temperature is 820-860 ℃, and the total compression ratio of the casting blank is more than 6;
4) and air-cooling the rolled angle steel to obtain the high-strength high-toughness weather-resistant angle steel for the iron tower.
2. The angle iron for high strength, high toughness and weather resistance of iron tower as claimed in claim 1, comprises the following components by weight percent:
c: 0.081%, Si: 0.25%, Mn: 1.29%, P: 0.010%, S: 0.003%, Cr: 0.46%, Ni: 0.38%, Cu: 0.32%, Als: 0.027%, N: 0.01%, Nb: 0.02%, Ti: 0.021%, V: 0.04% and the balance Fe.
3. The angle iron for high strength, high toughness and weather resistance of iron tower as claimed in claim 1, comprises the following components by weight percent:
c: 0.083%, Si: 0.30%, Mn: 1.18%, P: 0.009%, S: 0.002%, Cr: 0.75%, Ni: 0.37%, Cu: 0.31%, Als: 0.024%, N: 0.018%, Nb: 0.03%, Ti: 0.029%, V: 0.05% and the balance Fe.
4. The method for preparing high-strength high-toughness weather-resistant angle steel for iron towers in any one of claims 1 to 3, which comprises the following steps:
1) smelting the components of the high-strength high-toughness weather-resistant angle steel for the iron tower, and carrying out continuous casting to obtain a continuous casting blank, wherein the continuous casting blank is cooled to room temperature by stacking;
2) heating the continuous casting billet, wherein the soaking time of the continuous casting billet is 20-40 min, and the tapping temperature is 1160-1210 ℃;
3) rolling the heated continuous casting blank, wherein the initial rolling temperature is 1120-1180 ℃, the final rolling temperature is 820-860 ℃, and the total compression ratio of the casting blank is more than 6;
4) and air-cooling the rolled angle steel to obtain the high-strength high-toughness weather-resistant angle steel for the iron tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710705302.2A CN107502835B (en) | 2017-08-17 | 2017-08-17 | High-strength high-toughness weather-resistant angle steel for iron tower and preparation method thereof |
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| CN201710705302.2A CN107502835B (en) | 2017-08-17 | 2017-08-17 | High-strength high-toughness weather-resistant angle steel for iron tower and preparation method thereof |
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| CN108425068A (en) * | 2018-05-16 | 2018-08-21 | 中唐空铁科技有限公司 | A kind of steel can be used as bridge steel plate and empty iron traveling wheel support plate |
| CN109252091B (en) * | 2018-09-19 | 2020-10-02 | 武汉钢铁有限公司 | High-toughness high-weather-resistance steel and preparation method thereof |
| CN109487164A (en) * | 2018-12-13 | 2019-03-19 | 河钢股份有限公司 | Steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its production method |
| CN110512141A (en) * | 2019-09-05 | 2019-11-29 | 首钢集团有限公司 | A kind of electric tower weathering steel and preparation method thereof and weather-proof angle steel |
| CN112647020A (en) * | 2020-12-11 | 2021-04-13 | 贵州电网有限责任公司 | Weather-resistant steel tower and preparation method thereof |
| CN113846895A (en) * | 2021-10-15 | 2021-12-28 | 峻江建设有限公司 | High-strength iron tower main rod and preparation method thereof |
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| CN100580123C (en) * | 2008-08-29 | 2010-01-13 | 攀钢集团研究院有限公司 | High strength anti-weathering steel and producing method thereof |
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