CN106756468A - A kind of preparation method of 800Mpa transmission towers high-strength weathering steel - Google Patents
A kind of preparation method of 800Mpa transmission towers high-strength weathering steel Download PDFInfo
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- CN106756468A CN106756468A CN201510831031.6A CN201510831031A CN106756468A CN 106756468 A CN106756468 A CN 106756468A CN 201510831031 A CN201510831031 A CN 201510831031A CN 106756468 A CN106756468 A CN 106756468A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Mechanical Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The application provides a kind of preparation method of 800Mpa transmission towers high-strength weathering steel, its weather-proof composition of steel of optimization, using high temperature soak, high-temperature final rolling and high temperature coiling and the preparation method of controlled rolling and controlled cooling, produce a kind of low cost, pollute small, preparation process is simple, the weathering steel of high-strength corrosion-resistant corrosion energy.Its financial cost is than conventional weathering steel low cost more than 25%；Yield strength reaches 769MPa, tensile strength 857Mpa, and breaking elongation 20.9%, -40 DEG C of ballistic work is 44J, and cold-bending property is qualified；And with excellent corrosion resistance, wherein RtAnd RrustPeak is respectively up to 1150 and 63ohm cm2；Weathering steel prepared by the present invention can be promoted the use of in transmission of electricity industry extra-high voltage project, and effective energy-saving and emission-reduction have remarkable effect to reducing the cost of raw material and shaft tower later period maintenance cost.
Description
Technical field
The present invention relates to a kind of preparation method of weathering steel, specifically, it is related to a kind of 800Mpa transmission towers to use
The preparation method of high-strength weathering steel.
Background technology
The deep-etching gas such as sulfide, oxynitrides of industrial gas emission, heavy corrosion is chronically exposed to greatly
Iron tower of power transmission line among gas, every two years needs to carry out a preservative treatment, not only high cost to it, but also
Need to be had a power failure treatment, and economic loss is serious.
In the exploitation of weather resisting steel, domestic and international common practice is that a certain amount of anti-corrosion element is added in steel,
Such as Cr, Ni, Mo, Cu, while reducing hazardous elements S content in steel as far as possible.The corrosion resistance of steel is basic
It is that above-mentioned anti-corrosion element works, but above-mentioned alloying element is expensive, particularly Ni, Mo etc. increased
The weathering steel cost of raw material.Additionally, electric power line pole tower is also using aseptic technics such as galvanizings, and galvanizing is anti-
Corruption needs the operation such as rust cleaning, pickling, zinc-plated, and investment is big, and this process contamination is serious.Because zinc liquid need to be heated to
450 DEG C, discharge pernicious gas, harm people's health；Especially Cr in Zincing passivation solution6+, to human body and ring
There is very big harm in border, not environmentally；Meanwhile, it is zinc-plated to increased steel tower manufacturing cost；Additionally, rotten in industrial atmosphere
Under erosion environment, the life-span of zinc coat is general at 10 years or so, less than circuit service life, in circuit running
In still need to carry out Corrosion Maintenance using modes such as brushing corrosion resistant coatings.Though Aplataer process is improving coating anti-corrosion life side
Face obtains certain effect, but due to high cost, technology is immature the shortcomings of all do not promoted on a large scale
Using.
Accordingly, it is desirable to provide it is a kind of be applied to electric power line pole tower long-effective corrosion, technical, better economy and
The small high-strength weathering steel of environmental pollution, to extend the anti-corrosion life of electric power line pole tower, reduces transmission line of electricity bar
The anti-corrosion operating cost of tower.
The content of the invention
The purpose of the present invention is to overcome that the above-mentioned prior art weathering steel cost of raw material is high, hot galvanized layer preparation section
The aspect problem such as complicated and later stage Corrosion Maintenance is costly, environmental pollution is serious, a kind of 800Mpa is defeated for proposition
The preparation method of electric pole tower high-strength weathering steel, its weather-proof composition of steel of optimization, using high temperature soak, high-temperature final rolling
With high temperature coiling and the preparation method of controlled rolling and controlled cooling, produce a kind of low cost, pollute small, preparation process is simple,
The weathering steel of high-strength corrosion-resistant corrosion energy.
To achieve the above object, the present invention uses following technical scheme：
A kind of 800Mpa transmission towers high-strength weathering steel, weathering steel is by following component by weight percentage
It is prepared from：C, 0.13~0.20%；Si, 0.60~2.0%；Mn, 1.0~1.5%；P, 0.01~0.02%；
S ,≤0.003%；Al, 0.5~1.5%；N, 0.001~0.005%；O ,≤0.003%；Balance of Fe and micro-
Amount impurity.
Preferably, weathering steel is prepared from by following component by weight percentage：C, 0.16~0.19%；
Si, 1.0~1.5%；Mn, 1.3~1.4%；P, 0.012~0.013%；S ,≤0.003%；Al, 0.7~1.2%；
N, 0.002~0.004%；O ,≤0.003%；Balance of Fe and trace impurity.
Preferably, weathering steel is prepared from by following component by weight percentage：C, 0.18%；Si, 1.1%；
Mn, 1.4%；P, 0.013%；S, 0.003%；Al, 0.9%；N, 0.0028%；O, 0.003%；It is remaining
Measure is Fe and trace impurity.
Further, a kind of method of 800Mpa transmission towers high-strength weathering steel, comprises the steps：
1) converter or electric furnace smelting；2) LF refining or RH application of vacuum；3) continuous casting；4) high-temperature heating
Stove heat；5) roughing；6) high temperature finish rolling；7) cool down；8) high temperature coiling is coiled.
Further, step 4) include：By heating strand to 1300~1350 DEG C；By weathering steel effective thickness
Determine soaking time, 2.0min/mm；Step 5) and step 6) in, weathering steel workpiece thickness is into
10~12 times of product thickness, wherein, 950~1000 DEG C of entry temperature at finishing, 900 DEG C of finishing temperature.
Further, step 7) include：With section cooling and air cooling mode, wherein, 30~40 DEG C of water-cooled speed
/s；Step 8) include：Batched at 550~600 DEG C, one hour air cooling is incubated after high temperature coiling and is got product.
In the present invention described below the reasons why chemical composition limited amount：
C content selection of the invention is 0.13~0.20%.C is most basic intensified element in steel, can improve strong
Degree, but C increases the weldability and toughness of influence steel.In order that the yield strength of steel reaches more than 700MPa,
C need to be more than 0.12%.
Si contents selection of the invention is 0.60~2.0%.Si is solution strengthening element, can improve intensity；Together
When SiO can be generated under atmospheric corrosion environment2, play corrosion-resistant effect；But easy segregation causes flaw detection unqualified,
In order to improve intensity and increase the corrosion resistance of steel, Si is needed to measure more than 0.60%, but it is easy to cross high Si content
Reduce the welding performance of steel.
Mn contents selection of the invention is 1.0~1.5%.Mn is solution strengthening element, can improve intensity and
Toughness.
P content selection of the invention is 0.01~0.02%.P is unfavorable to welding, and with cold brittleness, belongs in steel
Harmful element；In the present invention, P content is generally higher than straight carbon steel, because P is effective corrosion-resistant element, P
Amount increases, and to improving corrosion resistance of steel energy effect is significant, in order to increase corrosion resistance, the content control of P exists
0.01~0.02%.
Al content selection of the invention is 0.5~1.5%.Al has crystal grain thinning and invigoration effect, the present invention
Al amounts are higher, and are more than 50~100 times of general carbon weathering steel content, because Al has Grain refinement,
Crystal grain thinning can improve hardness of steel and toughness；Additionally, in atmosphere, Al can form Al in rusty scale2O3,
Al2O3Can prevent steel substrate from further aoxidizing, with corrosion-resistant effect；The addition of Al elements, instead of biography
The precious metal such as Cr, Ni and Cu in system Steel material, reduces cost is promoted the use of to weathering steel, with weight
Want meaning.
With immediate prior art ratio, the present invention provide technical scheme there is following excellent effect：
1st, financial cost is relatively low, than conventional weathering steel low cost more than 25%.High content is added in the weathering steel
Si and Al, substitutes noble element Cr, Ni, Cu etc., significantly reduces cost.
2nd, 800Mpa weathering steels have excellent mechanical performance and decay resistance.Its yield strength reaches 769MPa,
Tensile strength 857Mpa, breaking elongation 20.9%, -40 DEG C of ballistic work is 44J, and cold-bending property is qualified.And
With excellent corrosion resistance, wherein RtAnd RrustPeak is respectively up to 1150 and 63ohm cm2。
3rd, preparation technology and required equipment are simple.The present invention is smelted and steel rolling equipment using conventional, and Hot-roller
Skill is simple and feasible.
4th, application prospect is extensive.Weathering steel prepared by the present invention can be promoted in transmission of electricity industry extra-high voltage project to be made
With effective energy-saving and emission-reduction have remarkable effect to reducing the cost of raw material and shaft tower later period maintenance cost.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the present invention, below will be attached to what is used needed for embodiment
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention,
For those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 weathering steel electrochemical test analog circuit figures；
Fig. 2 800MPa weathering steel rusty scale resistance test datagrams；
In figure：UFWS：800MPa weathering steels, Q420：Traditional weathering steel；RtAnd RrustRepresent electrochemistry
Parameter.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out it is clear,
It is fully described by, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole
Embodiment.Based on the embodiment in the present invention, the every other implementation that those of ordinary skill in the art are obtained
Example, belongs to the scope of protection of the invention.
Embodiment 1
Weathering steel of the present invention is prepared from by following component by weight percentage：C, 0.14%；Si, 1.9%；
Mn, 1.2%；P, 0.011%；S, 0.003%；Al, 0.5%；N, 0.0032%；O, 0.002%；It is remaining
Measure is Fe and trace impurity.
Weathering steel step of preparation process is as follows：
1) converter or electric furnace smelting；2) LF refining；3) continuous casting；4) high-temperature heating stove heat：By strand
1320 DEG C are heated to, soaking time presses weathering steel effective thickness 2.0min/mm controls, initial slab thickness is
80mm, soaking time is 160min；5) roughing：Weathering steel workpiece thickness is finished product thickness (33mm)
10 times；6) high temperature finish rolling：Weathering steel workpiece thickness is 10 times of finished product thickness (33mm), its
In, 980 DEG C of entry temperature at finishing, 900 DEG C of finishing temperature；7) cool down：Section cooling and air cooling, water-cooled speed
35 DEG C/s of degree control；8) high temperature coiling is coiled：580 DEG C of coiling temperature, is incubated a small space-time after high temperature coiling
It is cold to get product.
Embodiment 2
Weathering steel of the present invention is prepared from by following component by weight percentage：C, 0.17%；Si, 1.0%；
Mn, 1.3%；P, 0.012%；S, 0.002%；Al, 0.7%；N, 0.0040%；O, 0.002%；It is remaining
Measure is Fe and trace impurity.
Weathering steel step of preparation process is as follows：
1) converter or electric furnace smelting；2) LF refining；3) continuous casting；4) high-temperature heating stove heat：By strand
1330 DEG C are heated to, soaking time presses weathering steel effective thickness 2.0min/mm controls, initial slab thickness is
80mm, soaking time is 160min；5) roughing：Weathering steel workpiece thickness is finished product thickness (32mm)
11 times；6) high temperature finish rolling：Weathering steel workpiece thickness is 11 times of finished product thickness (32mm), its
In, 980 DEG C of entry temperature at finishing, 900 DEG C of finishing temperature；7) cool down：Section cooling and air cooling, water-cooled speed
30 DEG C/s of degree control；8) high temperature coiling is coiled：600 DEG C of coiling temperature, is incubated a small space-time after high temperature coiling
It is cold to get product.
Embodiment 3
Weathering steel of the present invention is prepared from by following component by weight percentage：C, 0.18%；Si, 1.1%；
Mn, 1.4%；P, 0.013%；S, 0.003%；Al, 0.9%；N, 0.0028%；O, 0.001%；It is remaining
Measure is Fe and trace impurity.
Weathering steel step of preparation process is as follows：
1) converter or electric furnace smelting；2) RH application of vacuum；3) continuous casting；4) high-temperature heating stove heat：Will
To 1340 DEG C, soaking time presses weathering steel effective thickness 2.0min/mm controls to heating strand, and initial slab is thick
It is 80mm to spend, and soaking time is 160min；5) roughing：Weathering steel workpiece thickness is finished product thickness (35
Mm) 10 times；6) high temperature finish rolling：Weathering steel workpiece thickness is 10 times of finished product thickness (35mm),
Wherein, 1000 DEG C of entry temperature at finishing, 900 DEG C of finishing temperature；7) cool down：Section cooling and air cooling, water
Speed of cooling controls 30 DEG C/s；8) high temperature coiling is coiled：600 DEG C of coiling temperature, is incubated one small after high temperature coiling
When air cooling get product.
Embodiment 4
Weathering steel of the present invention is prepared from by following component by weight percentage：C, 0.16%；Si, 0.8%；
Mn, 1.1%；P, 0.010%；S, 0.001%；Al, 1.0%；N, 0.0013%；O, 0.002%；It is remaining
Measure is Fe and trace impurity.
Weathering steel step of preparation process is as follows：
1) converter or electric furnace smelting；2) RH application of vacuum；3) continuous casting；4) high-temperature heating stove heat：Will
To 1300 DEG C, soaking time presses weathering steel effective thickness 2.0min/mm controls to heating strand, and initial slab is thick
It is 80mm to spend, and soaking time is 160min；5) roughing：Weathering steel workpiece thickness is finished product thickness (36mm)
12 times；6) high temperature finish rolling：Weathering steel workpiece thickness is 12 times of finished product thickness (36mm), its
In, 960 DEG C of entry temperature at finishing, 900 DEG C of finishing temperature；7) cool down：Section cooling and air cooling, water-cooled speed
40 DEG C/s of degree control；8) high temperature coiling is coiled：560 DEG C of coiling temperature, is incubated a small space-time after high temperature coiling
It is cold to get product.
Embodiment 5
Weathering steel of the present invention is prepared from by following component by weight percentage：C, 0.15%；Si, 1.8%；
Mn, 1.5%；P, 0.018%；S, 0.002%；Al, 1.3%；N, 0.0010%；O, 0.003%；It is remaining
Measure is Fe and trace impurity.
Weathering steel step of preparation process is as follows：
1) converter or electric furnace smelting；2) LF refining；3) continuous casting；4) high-temperature heating stove heat：By strand
1340 DEG C are heated to, soaking time presses weathering steel effective thickness 2.0min/mm controls, initial slab thickness is
80mm, soaking time is 160min；5) roughing：Weathering steel workpiece thickness is finished product thickness (32mm)
11 times；6) high temperature finish rolling：Weathering steel workpiece thickness is 11 times of finished product thickness (32mm), wherein,
990 DEG C of entry temperature at finishing, 900 DEG C of finishing temperature；7) cool down：Section cooling and air cooling, water-cooled speed control
36 DEG C/s of system；8) high temperature coiling is coiled：590 DEG C of coiling temperature, one hour air cooling is incubated after high temperature coiling is
Obtain finished product.
The high-strength weathering steel that embodiment 1~5 is made carries out mechanical property, impact, bend test detection, detection
Data such as table 1.
The high-strength weathering steel performance test results of table 1
After performance detection being carried out to the weathering steel that embodiment 1~5 is made, weathering steel and biography in another Example 3
System weathering steel Q420 carries out indoor accelerated corrosion experiment and electrochemical test, tests its corrosion resistance, its experiment
Result data is shown in accompanying drawing 2.As shown in Figure 2, after after tested, the resistance R of novel weathering resistant steel of the present inventiont、Rrust
With Q420 ratios, in cycle period, novel weathering resistant steel R of the present inventiontAnd RrustPeak is respectively up to 1150 Hes
63ohm cm2, it is significantly higher than Q420, it is seen that high-strength weathering steel excellent anti-corrosion performance prepared by the present invention.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvements made etc., in pending right of the invention
Within the scope of claimed.
Claims (7)
1. a kind of 800Mpa transmission towers high-strength weathering steel, it is characterised in that the weathering steel is by by weight
The following component for measuring percentages is prepared from：
C, 0.13~0.20%；Si, 0.60~2.0%；Mn, 1.0~1.5%；P, 0.01~0.02%；S ,≤0.003%；
Al, 0.5~1.5%；N, 0.001~0.005%；O ,≤0.003%；Balance of Fe and trace impurity.
2. a kind of 800Mpa transmission towers high-strength weathering steel as claimed in claim 1, it is characterised in that
The weathering steel is prepared from by following component by weight percentage：
C, 0.16~0.19%；Si, 1.0~1.5%；Mn, 1.3~1.4%；P, 0.012~0.013%；Al,
0.7~1.2%；N, 0.002~0.004%.
3. a kind of 800Mpa transmission towers high-strength weathering steel as claimed in claim 1, it is characterised in that
The weathering steel is prepared from by following component by weight percentage：
C, 0.18%；Si, 1.1%；Mn, 1.4%；P, 0.013%；S, 0.003%；Al, 0.9%；N,
0.0028%；O, 0.003%.
4. a kind of preparation method of 800Mpa transmission towers high-strength weathering steel as claimed in claim 1,
Comprise the steps：
1) converter or electric furnace smelting；2) LF refining or RH application of vacuum；3) continuous casting；4) high-temperature heating
Stove heat；5) roughing；6) high temperature finish rolling；7) cool down；8) high temperature coiling is coiled.
5. preparation method as claimed in claim 4, it is characterised in that the step 4) include：Will casting
Base is heated to 1300~1350 DEG C；Determine soaking time, 2.0min/mm by weathering steel effective thickness.
6. preparation method as claimed in claim 4, it is characterised in that the step 5) and step 6) in,
Weathering steel workpiece thickness is 10~12 times of finished product thickness, wherein, 950~1000 DEG C of entry temperature at finishing,
900 DEG C of finishing temperature.
7. preparation method as claimed in claim 4, it is characterised in that the step 7) include：With layer
Stream cooling and air cooling mode, wherein, 30~40 DEG C/s of water-cooled speed；The step 8) include：550~600 DEG C
Under batch, after batching be incubated one hour air cooling get product.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111020365A (en) * | 2018-10-09 | 2020-04-17 | 中国电力科学研究院有限公司 | Weather-resistant steel, steel plate manufacturing method thereof and angle steel manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102650015A (en) * | 2012-05-29 | 2012-08-29 | 江苏省沙钢钢铁研究院有限公司 | Economical-type fine-grain high-flexibility weather-proof medium steel plate and production method thereof |
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2015
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102650015A (en) * | 2012-05-29 | 2012-08-29 | 江苏省沙钢钢铁研究院有限公司 | Economical-type fine-grain high-flexibility weather-proof medium steel plate and production method thereof |
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| 王国承: "《钢中夹杂物尺寸控制理论》", 31 January 2015, 冶金工业出版社 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111020365A (en) * | 2018-10-09 | 2020-04-17 | 中国电力科学研究院有限公司 | Weather-resistant steel, steel plate manufacturing method thereof and angle steel manufacturing method |
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Application publication date: 20170531 |