CN107502835A - A kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof - Google Patents

A kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof Download PDF

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CN107502835A
CN107502835A CN201710705302.2A CN201710705302A CN107502835A CN 107502835 A CN107502835 A CN 107502835A CN 201710705302 A CN201710705302 A CN 201710705302A CN 107502835 A CN107502835 A CN 107502835A
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steel
weather
strength
angle steel
ductility
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CN107502835B (en
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曾尚武
徐德录
张磊
李光
郭晓宏
张瑞琦
张东英
任玉锁
李凤辉
尹爱辉
张猛
赵道远
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北京国网富达科技发展有限责任公司
国家电网公司
国网山东省电力公司济南供电公司
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Abstract

The invention provides a kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof.By weight percentage, the weather-proof angle steel of steel tower high-strength and high ductility contains following composition:C:0.05% 0.10%, Si:0.15% 0.40%, Mn:1.10% 1.50%, P≤0.020%, S≤0.005%, Cr:0.40% 1.00%, Ni:0.30% 0.40%, Cu:0.30% 0.40%, Als >=0.015%, N:0.02% 0.07%, Nb:0.01% 0.04%, Ti:0.01% 0.05%, V:0.03% 0.08%, remaining is Fe.Present invention also offers the preparation method of the above-mentioned weather-proof angle steel of steel tower high-strength and high ductility.The advantage of the invention is that by alloying element Combination Design, intensity high and low temperature high tenacity, the steel tower hot rolling weather-resisting angle steel of atmospheric corrosion resistance are obtained, and can be produced in batches under the conditions of existing angle steel production equipment.

Description

A kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof
Technical field
The present invention relates to field of metallurgy, and in particular to a kind of weather-proof angle steel of steel tower high-strength and high ductility and preparation method thereof.
Background technology
China's iron tower of power transmission line mainly selects hot-rolled angle steel section bar for a long time, is aided with a small amount of steel pipe as tower material, when It is preceding to use the trade mark based on Q235, Q345 and Q420, and developed countries electric power pylon uses Q400, Q450, Q500 level more Angle steel manufactures, and compared with developed countries, less varieties, intensity level are relatively low.Ultra-high/extra-high voltage iron tower of power transmission line tends to maximize, bar Deethanizer design load is also increasing, and conventional hot-rolled angle steel is all difficult to meet that the use of big load shaft tower will in intensity and specification Ask.It is general that the requirement of the bearing capacity of iron tower construction member is met using the method for compound section when component design load is larger, this Iron tower pole number of packages amount and specification is necessarily caused to increase, joint structure is complicated, installation workload increase, both causes construction investment to increase Add, waste ample resources again, this promotes the steel strength rank that engineering is selected to higher development.Data show according to statistics Show, under same load design, replace Q345 levels angle steel averagely to reduce steel using amount 10% or so using Q460 levels angle steel.
Electric power pylon at low ambient temperatures, due to steel brittle fracture under low temperature effect, it may occur however that low stress brittle fracture phenomenon. Extra-high-voltage alternating current multi-circuit lines on the same tower transmission capacity is big, and important level is high, higher to steel product quality class requirement.Q345B steel Charpy (V-type) impact test test temperature and impact absorbing energy be respectively 20 DEG C and not less than 34J.Extra-high-voltage alternating current line Road reaches less than -40 DEG C through some areas (such as the Inner Mongol etc.) lowest temperature, Q345B higher to steel product quality class requirement It is difficult to meet the requirement of cryogenic steel, so as to bring hidden danger to the operation of cold district electric power pylon long-term safety.
In the electric power pylon using carbon steel and low-alloy structural steel in the fabrication process, anti-corrosion is carried out using galvanizing.Plating Zinc anticorrosion needs have special derusting, pickling, zinc-plated process, make the increase of steel tower manufacturing cost, and pollute environment.With power network The transmission of electricity new technology such as the continuous improvement of its construction level and multiple-loop line road, compact line, more division large-section leads is answered With so that shaft tower load is increasing, and steel tower deadweight is increasing (to develop into maximum single base tower weight from single base tower weight 1-2 tons More than 5000 tons), the distinctive derusting of galvanized anticorrosive, pickling, zinc-plated process and caused by waste of material, maintenance cost increase, environment Pollution problem urgent need solves.Applicating energy-saving, new material, new technology and the new technology of environmental protection, are power grid construction and development Inexorable trend.
Weathering steel has green, environmental protection, the characteristic such as energy-conservation, long lifespan, and has the performances such as high-strength, high-ductility concurrently, case tank, The fields such as vehicle, building, bridge are widely used.Weathering steel improves steel by adding the alloying elements such as P, Cu, Cr, Ni Decay resistance.In use, surface of steel plate contacts weathering steel with corrosive atmosphere, by electrochemical action, P, Cu, The elements such as Cr, Ni are enriched with surface of steel plate, and with the oxygen and reaction of moisture in air, it is fine and close in weathering steel Surface Creation Amorphous state spinel oxide, steel matrix is protected, prevents corrosive environment from further corroding steel matrix, reach higher resistance to big Gas corrosion performance, its corrosion resistance are 4-8 times of carbon structural steel, and because it has higher-strength, and a reasonable price, cost is remote Less than stainless steel, therefore have a extensive future.In transmission line of electricity application weathering steel steel tower, it is possible to reduce environmental pollution, reduce steel Consumption and processing cost, have significant economic benefit and social benefit.
The weather-proof angle steel of China Electric Power Research Institute's clod wash carries out research and pilot application.Result of study shows, is transmitting electricity Rolled steel dosage can be saved using weather-resistant cold bending shaped steel in line steel tower, reduced environmental pollution, achieve significant economic effect Benefit and social benefit.China's the first base weather-resistant cold bending shaped steel electric power pylon is in self-sown-interior official's multi-line power transmission iron of 220kV Xiamen Chinese parasol tree Tower pilot application project, which is successfully built, to put into operation.But often there are two classes during actual processing use in the weather-proof angle steel of clod wash type Defect.One kind is cutting lamination defect, and when cold cut is cut, cutting fracture is layered hot rolling weather-resisting steel plate, and layered position is in warm The center of roll bending thickness direction.Such defect causes steel plate to be affected during subsequent use, its corrosion resistance Energy and welding performance reduce.Another kind of defect is 90 ° of cold bend crackings, and after cold-bending deformation, corner goes out hot rolling weather-resisting steel plate Now ftracture, cause weather-proof cold bending angle iron electric power pylon can not deploy to apply on a large scale.
In summary, it is necessary to develop the Q420 levels under cryogenic with high tenacity, Q460 levels or higher level Hot rolling weather-resisting angle steel.UHV transmission line uses the weather-proof angle steel of high-strength and high ductility, can significantly reduce steel tower weight, effectively save Resource, environmental protection, while low temp area transmission tower steel requirement can be met, there is preferable economic and social benefit.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide it is a kind of with high intensity, low-temperature high-toughness it is resistance to Middle-size and small-size bugle steel of atmospheric corrosion hot rolling and preparation method thereof.
To reach above-mentioned purpose, the invention provides a kind of weather-proof angle steel of steel tower high-strength and high ductility, by weight percentage, The weather-proof angle steel of steel tower high-strength and high ductility contains following composition:
C:0.05%-0.10%, Si:0.15%-0.40%, Mn:1.10%-1.50%, P≤0.020%, S≤ 0.005%, Cr:0.40%-1.00%, Ni:0.30%-0.40%, Cu:0.30%-0.40%, Als >=0.015%, N: 0.02%-0.07%, Nb:0.01%-0.04%, Ti:0.01%-0.05%, V:0.03%-0.08%, remaining is Fe.
Steel tower provided by the present invention is with technical scheme used by the weather-proof angle steel of high-strength and high ductility:Low C, high Mn, low S, Nb, V, Ti+Als combined microalloying.
C element all has a great impact to the intensity, low-temperature flexibility and welding performance of steel.The application contains C element Amount is controlled in 0.05%-0.10%, can either be ensured the intensity of steel, can be avoided the low-temperature flexibility and welding performance for steel again Adverse effect.
The content control of Mn elements is 1.10%-1.50% by the application, can either play deoxidation of the Mn elements in steel Desulphuration, there can also be part Mn to be dissolved in ferrite and cementite and improve intensity, while Mn elements can also make in steel Pearlitic structrure refinement, the toughness of steel can be improved by improving manganese element content in mild steel.
Microalloy element Nb, V and Ti element add in steel and are remarkably improved intensity.V element is can be fully molten in heating Solution is separated out in cooling procedure into steel in the form of tiny carbon, nitride in the matrix and crystal boundary of steel, and it is strong to play precipitation Change the effect with crystal grain thinning.Nb elements can postpone austenite recrystallization in hot rolling and reach the purpose of crystal grain thinning;Phase For large-scale bugle steel, cooling velocity is slightly higher during middle-size and small-size bugle steel hot rolling and roller repairing.Given birth to by suitable control Rhythm and technique adjustment are produced, be able to will be had a small amount of by angle steel finishing temperature within a certain range on traditional hot-rolled angle steel production line Nb (CN) disperse educt, play precipitation strength effect.Ti elements are strong carbonitride-forming elements, form TiN, TiC and are heating With Austenite Grain Growth, fining austenite grains can be prevented during soaking.Meanwhile Ti has postponed steel containing niobium and controlled Recrystallization in the operation of rolling, also plays fining austenite grains.
Als is that tradition is solid N element, and forming AlN can be with fining austenite grains.
P element can improve hardness of steel, hardness, especially corrosion resistance, but reduce plasticity, toughness.S is used as in steel to be had Evil element, the low-temperature flexibility and corrosion resistance of steel are had a strong impact on to it, so P, S constituent content all should be controlled effectively System.
By adding a certain amount of Cu, Cr and Ni element in steel, atmospheric corrosion resistant steel then resistance to industrial atmospheric can be ensured Performance.
The weather-proof angle steel of steel tower high-strength and high ductility provided by the invention can have following preferably constitute:
By weight percentage, the weather-proof angle steel of steel tower high-strength and high ductility contains following composition: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%, remaining is Fe.Or
By weight percentage, the weather-proof angle steel of steel tower high-strength and high ductility contains following composition: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%, remaining is Fe.
Present invention also offers the preparation method of the above-mentioned weather-proof angle steel of steel tower high-strength and high ductility, it comprises the following steps:
1) steel tower is smelted with the composition of the weather-proof angle steel of high-strength and high ductility, and continuous casting obtains continuous casting billet, continuous casting billet is adopted Room temperature is cooled to stacking;
2) continuous casting billet being heated, the soaking time of continuous casting billet is 20min-40min, tapping temperature is 1160 DEG C- 1210℃;
3) continuous casting billet by heating is rolled, wherein, 1120 DEG C -1180 DEG C of start rolling temperature, finishing temperature 820 DEG C -860 DEG C, strand overall compression ratio > 6;
4) air cooling is carried out for the angle steel after rolling, obtains the weather-proof angle steel of steel tower high-strength and high ductility.
The advantage of the invention is that by alloying element Combination Design, it is rotten to obtain intensity high and low temperature high tenacity, resistance to air The steel tower of erosion hot rolling weather-resisting angle steel, and can be produced in batches under the conditions of existing angle steel production equipment.
Embodiment
In order to which technical characteristic, purpose and the beneficial effect of the present invention is more clearly understood, now to the skill of the present invention Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1,2
Embodiment 1-2 provides a kind of weather-proof angle steel of steel tower high-strength and high ductility, and its composition composition is as shown in table 1, and it is logical Cross following steps preparation:
1) steel tower is smelted with the composition of the weather-proof angle steel of high-strength and high ductility, and continuous casting obtains continuous casting billet, continuous casting billet uses Stacking is cooled to room temperature;
2) continuous casting billet is heated, the soaking time of continuous casting billet, tapping temperature are referring to table 2;
3) continuous casting billet by heating is rolled, wherein, start rolling temperature, finishing temperature are referring to table 2, strand total compression Than > 6;
4) air cooling is carried out for the angle steel after rolling, obtains the weather-proof angle steel of steel tower high-strength and high ductility.
Other main technologic parameters in preparation process are shown in Table 2, and mechanical property is shown in Table 3, and rate of corrosion is shown in Table 4.
Meanwhile comparative example 1 can also be prepared with reference to above-mentioned steps, its related content is referring also to table 1-4.
The composition of table 1 forms (percentage by weight)
The main technologic parameters of table 2
The mechanical property of table 3
The test of mechanical property in table 3 is according to GB/T228.1-2010 metal material stretching test part 1s:Room temperature is tried Proved recipe method and GB/T229-2007 metal material Charpy pendulum impact tests method are carried out.
The corrosive nature of table 4
The test of corrosive nature in table 4 is according to TB/T 2375-1993 railways weathering steel alternate-immersion test side Method is carried out.
The dependence test result of the relatively corrosive speed provided in table 4 embodies embodiment 1 and embodiment 2 and comparative example 1 The relatively corrosive speed compared, can be seen that by the data in table 4:The decay resistance of the weather-proof angle steel of the application is much better than normal Advise angle steel.

Claims (4)

1. a kind of weather-proof angle steel of steel tower high-strength and high ductility, by weight percentage, the weather-proof angle steel of steel tower high-strength and high ductility contain Following composition:
C:0.05%-0.10%, Si:0.15%-0.40%, Mn:1.10%-1.50%, P≤0.020%, S≤0.005%, Cr:0.40%-1.00%, Ni:0.30%-0.40%, Cu:0.30%-0.40%, Als >=0.015%, N:0.02%- 0.07%, Nb:0.01%-0.04%, Ti:0.01%-0.05%, V:0.03%-0.08%, remaining is Fe.
2. the weather-proof angle steel of steel tower high-strength and high ductility according to claim 1, by weight percentage, the high-strength height of the steel tower Tough weather-proof angle steel contains following composition:
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%, remaining is Fe.
3. the weather-proof angle steel of steel tower high-strength and high ductility according to claim 1, by weight percentage, the high-strength height of the steel tower Tough weather-proof angle steel contains following composition:
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%, remaining is Fe.
4. the preparation method of the weather-proof angle steel of steel tower high-strength and high ductility described in claim any one of 1-3, it comprises the following steps:
1) steel tower is smelted with the composition of the weather-proof angle steel of high-strength and high ductility, and continuous casting obtains continuous casting billet, continuous casting billet uses heap Pile is cooled to room temperature;
2) continuous casting billet is heated, the soaking time of continuous casting billet is 20min-40min, and tapping temperature is 1160 DEG C -1210 DEG C;
3) to by heating continuous casting billet roll, wherein, 1120 DEG C -1180 DEG C of start rolling temperature, finishing temperature be 820 DEG C - 860 DEG C, strand overall compression ratio > 6;
4) air cooling is carried out for the angle steel after rolling, obtains the weather-proof angle steel of steel tower high-strength and high ductility.
CN201710705302.2A 2017-08-17 2017-08-17 High-strength high-toughness weather-resistant angle steel for iron tower and preparation method thereof Active CN107502835B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109252091A (en) * 2018-09-19 2019-01-22 武汉钢铁有限公司 High tenacity 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

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CN101338401A (en) * 2008-08-29 2009-01-07 攀钢集团研究院有限公司 High strength weathering steel and producing method thereof
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CN102212752A (en) * 2011-06-09 2011-10-12 中国电力科学研究院 Low-temperature angle steel and manufacturing method thereof
CN106947913A (en) * 2017-03-21 2017-07-14 马钢(集团)控股有限公司 A kind of high-strength high-toughness hot rolls weather-resistant steel plate and preparation method thereof

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CN101235470A (en) * 2008-02-28 2008-08-06 武汉钢铁(集团)公司 Ultra-low carbon hot rolling weather-resisting steel with yield strength more than 450MPa
CN101338401A (en) * 2008-08-29 2009-01-07 攀钢集团研究院有限公司 High strength weathering steel and producing method thereof
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109252091A (en) * 2018-09-19 2019-01-22 武汉钢铁有限公司 High tenacity 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

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