CN105506450A - Anti-seismic and weather-proof bridge steel and manufacturing process thereof - Google Patents
Anti-seismic and weather-proof bridge steel and manufacturing process thereof Download PDFInfo
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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Abstract
The invention relates to anti-seismic and weather-proof bridge steel. The anti-seismic and weather-proof bridge steel comprises the following components in percentage by weight: 0.04-0.08% of C, 0.15-0.30% of Si, 0.80-1.50% of Mn, not greater than 0.010% of P, not greater than 0.008% of S, 0.20-0.45% of Cu, 0.30-0.50% of Cr, 0.25-0.50% of Ni, 0.02-0.04% of Nb, 0.005-0.05% of V, 0.008-0.020% of Ti, 0.02-0.05% of Alt, and balance Fe. The anti-seismic and weather-proof bridge steel disclosed by the invention is simple in process and low in cost, has a high strength, a high toughness and excellent welding performance, and can meet the needs of high-thickness and wide-specification modern bridge structure construction; and an alloy cost is decreased due to a low carbon content, a carbon equivalent design, and addition of a small amount of Nb and V, the fine-grain structure is obtained through controlled rolling and controlled cooling, and a yield ratio of not greater than 0.80, a high strength, a high toughness and excellent welding performance are achieved.
Description
Technical field
The present invention relates to a kind of Bridge Steel and manufacturing process thereof, particularly relate to a kind of antidetonation Weather-resistance bridge steel and manufacturing process thereof, belong to Metal smelting Technology field.
Background technology
Atomospheric corrosion is one of principal mode of the bridge steel structure such as girder steel, Steel Bridge Deck inefficacy, and according to statistics, occur in the accident of fracture at steel bridge, nearly 20% causes because corroding.Prevent the main path that steel bridge ruptures because of corrosion from having two kinds: one to be development steel bridge coating antiseptic technology, as spary protective system, electric arc spraying compound coating, galvanizing (aluminium), glass reinforced plastic coating etc. at present.Wherein, protective system is the guard technology being applicable to Large Steel beam, being most widely used at present.Adopt in this way generally need every 3-5 safeguard once, need every 10-15 again application once.Therefore, steel bridge anticorrosive coating is costly, accounts for more than 10% of steel bridge total expenses.According to relevant department of former Ministry of Railways statistics, between 1984 ~ 1987 years 4 years, then application steel bridge more than 1260 hole, consume high-quality coating a few kiloton, costly.Two is the exposed weather resistant Bridge Steels of development, to substitute common Bridge Steel+steel bridge coating antiseptic technology.Weathering steel, also known as weather resisting steel, conventional weathering steel generally need utilize the elements such as Cu, P, Cr, Ni, by forming stable Surface Rust, stoping corrosion, playing weather-proof effect.Wherein, the weather-proof effect of Cu is the most remarkable, and Cr impels the formation of fine and close interior rusty scale, and Ni improves the stability of rusty scale, and P promotes rusty scale amorphous state.Generally speaking, Cu, P compound has optimum weather-proof effect.But consider that P causes low temperature brittleness and crack sensitivity, in important welded construction weathering steel, the content of general restriction P, only adds the alloying elements such as Cu, Cr, Ni.Weathering steel increases due to cost of alloy, and the one-time investment of material is higher than the common Bridge Steel of ad eundem.But due at factory and on-the-spot surface treatment and the coating decreasing component, so be that economic benefit recent or at a specified future date is all by highly significant.According to calculating, through the use of 40 years, the expense of ordinary steel+3 times application repeatedly exceedes 2 times of the naked cost of weathering steel.Therefore, develop Weather-resistance bridge steel to have broad prospects.
For ensureing the anti-seismic performance of Bridge Steel, bridge steel plate while pursuit high strength, high tenacity, using yield tensile ratio as an important index.The yield tensile ratio of steel is low, means that steel construction has high hardenability value and high uniform elongation.Taking place frequently and its catastrophic effect caused of earthquake, causes external showing great attention to bridge earthquake resistance, and made relevant regulations in some code for structural design.Antidetonation, Weather-resistance bridge steel are the development trends of bridge construction.
" preparation method of 420MPa high tenacity Weather-resistance bridge steel and hot-rolled sheet coil thereof " of patent No. CN102021495A discloses a kind of manufacture method of 420MPa level Weather-resistance bridge steel, there is good mechanical property and weather resistance, but be only applicable to the Plate Production of below thickness 15.5mm, width below 2250mm, the demand of heavy thickness, the modern bridge structure construction of wide specification can not be met, and containing B element, technique controlling difficulty is large.Patent No. CN103103458A " high-strength weathering steel and preparation method thereof " discloses a kind of production method of high-strength weathering steel, but C content 0.01-0.05%, belong to ultra low-carbon steel, smelt difficulty larger, Mn content 1.5-2.0%, strand easily produces center segregation, and finished product is the roll bending of Thin Specs, can not meet the demand of heavy thickness, the modern bridge structure construction of wide specification." hot rolled weatherproof bridge steel with yield strength of 500 MPa level and the manufacture method thereof " of patent No. CN101892431A discloses a kind of manufacture method of 500MPa level Weather-resistance bridge steel, but Mo content 0.15-0.35%, and needing RE-treated, cost is higher.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, a kind of antidetonation Weather-resistance bridge steel and manufacturing process thereof are provided, technique is simple, with low cost, there is the welding property of high strength, high tenacity and excellence, the demand of heavy thickness, the modern bridge structure construction of wide specification can be met.
In order to solve above technical problem, the invention provides a kind of antidetonation Weather-resistance bridge steel, comprising following component by weight percentage: C:0.04-0.08%, Si:0.15-0.30%, Mn:0.80-1.50%, P :≤0.010%, S :≤0.008%, Cu:0.20-0.45%, Cr:0.30-0.50%, Ni:0.25-0.50%, Nb:0.02-0.04%, V:0.005-0.0.05%, Ti:0.008-0.020%, Alt:0.02-0.05%, all the other are Fe content.
The technical scheme that the present invention limits further is: chemical composition is by weight percentage: C:0.05%, Si:0.18%, Mn:1.35%, P:0.008%, S:0.002%, Cu:0.35%, Cr:0.35%, Ni:0.27%, Nb:0.02%, V:0.02%, Ti:0.012%, Alt:0.03%, and all the other are Fe.
Further, chemical composition is by weight percentage: C:0.06%, Si:0.26%, Mn:1.25%, P:0.009%, S:0.003%, Cu:0.26%, Cr:0.45%, Ni:0.34%, Nb:0.03%, V:0.02%, Ti:0.015%, Alt:0.026%, and all the other are Fe.
Further, per-cent chemical composition is according to quantity: C:0.08%, Si:0.29%, Mn:0.90%, P:0.009%, S:0.002%, Cu:0.21%, Cr:0.40%, Ni:0.46%, Nb:0.035%, V:0.01%, Ti:0.018%, Alt:0.04%, and all the other are Fe.
A kind of manufacturing process of producing antidetonation Weather-resistance bridge steel, comprise converter or the smelting of electric furnace operation, external refining operation, pouring molten steel continuously cast bloom operation, process furnace heating process and plate mill rolling process, in process furnace heating process, Heating temperature is 1160-1250 DEG C, time is 2-6 hour, and steel inside obtains the prior austenite body tissue of fine uniform.
Further, in plate mill rolling process, adopt austenite recrystallization district (roughing rolling) and austenite Unhydrated cement (finish rolling rolling) two-phase control rolling technique, 2-4 passage transverse rolling before roughing rolling, by continuously cast bloom broadening to more than 3000mm, and pass through austenite recrystallization fining austenite grains repeatedly; Finish rolling rolling 4-9 passage, finish rolling start rolling temperature 860-920 DEG C, rolls the rear austenite structure obtaining sclerosis; Stop 10-30s after finish rolling, then through ultrafast but cold, cooling rate 5-20 DEG C/s, cold red temperature 500-650 DEG C eventually, air cooling is to room temperature subsequently.
Further, in process furnace heating process, after heat treatment furnace being heated to 500 ~ 600 DEG C, insulation more than 30min, after furnace temperature is stable, then enters stove and carries out tempering heat treatment by steel plate.The temperature of tempering heat treatment is 500 ~ 600 DEG C, and total time inside furnace (1.5h ~ 2.5h) min, h are steel plate thickness.
The invention has the beneficial effects as follows: adopt low C, the addition of C u, Ni, Cr, trace amount Nb, V, Ti multi-element composite micro-alloying Composition Design, by controlling heating phase temperature, adopting two benches controlled rolling process, control laminar flow speed of cooling, controlling the high-strength anti-seismic Weather-resistance bridge steel that final cooling temperature explained hereafter has ferrite+bainite structure, ferrite+bainite structure ensure that high room temperature strength and low yield strength ratio, improves anti-seismic performance; Add appropriate Cu, Ni, Cr, improve weather resistance; Low carbon content and carbon equivalent design, add a small amount of Nb, V, reduce cost of alloy, obtain fine grained texture by controlled rolling and controlled cooling, have the weldability of yield tensile ratio≤0.80, high strength, high tenacity and excellence.
Accompanying drawing explanation
Fig. 1 is the metallograph of steel plate microstructure of the present invention
Embodiment
Embodiment 1
Present embodiments provide the continuously cast bloom of three kinds of Different Weight per-cent chemical compositions, be as shown in table 1ly respectively numbering A, B and C:
A: its weight percent chemical composition is: C:0.05%, Si:0.18%, Mn:1.35%, P:0.008%, S:0.002%, Cu:0.35%, Cr:0.35%, Ni:0.27%, Nb:0.02%, V:0.02%, Ti:0.012%, Alt:0.03%, all the other are Fe and inevitable impurity.
B: its weight percent chemical composition is: C:0.06%, Si:0.26%, Mn:1.25%, P:0.009%, S:0.003%, Cu:0.26%, Cr:0.45%, Ni:0.34%, Nb:0.03%, V:0.02%, Ti:0.015%, Alt:0.026%, all the other are Fe and inevitable impurity.
C: its weight percent chemical composition is: C:0.08%, Si:0.29%, Mn:0.90%, P:0.009%, S:0.002%, Cu:0.21%, Cr:0.40%, Ni:0.46%, Nb:0.035%, V:0.01%, Ti:0.018%, Alt:0.04%, all the other are Fe and inevitable impurity.
Utilized by above-mentioned three kinds of continuously cast blooms the manufacture method designed by the present invention respectively to arrange three groups of different processing parameters to be respectively prepared, 6 blocks of high-strength anti-seismic Weather-resistance bridge steel plates are manufactured altogether, its concrete optimum configurations is as shown in table 2, and the width >=3000mm antidetonation Weather-resistance bridge steel plate transverse and longitudinal tensile property of 6 pieces of yield tensile ratio≤0.80 produced ,-40 DEG C of transverse and longitudinal ballistic works are listed in table 3.
The chemical composition (wt.%) of the antidetonation Weather-resistance bridge steel of table 1 yield tensile ratio≤0.80
| Numbering | C | Mn | Si | P | S | Nb | Ti | V | Cu | Cr | Ni | Alt |
| A | 0.05 | 1.35 | 0.18 | 0.008 | 0.002 | 0.020 | 0.012 | 0.02 | 0.35 | 0.35 | 0.27 | 0.030 |
| B | 0.06 | 1.25 | 0.26 | 0.009 | 0.003 | 0.030 | 0.015 | 0.02 | 0.26 | 0.45 | 0.34 | 0.026 |
| C | 0.08 | 0.90 | 0.29 | 0.009 | 0.002 | 0.035 | 0.018 | 0.01 | 0.21 | 0.40 | 0.46 | 0.040 |
The main rolling technological parameter of the antidetonation Weather-resistance bridge steel of table 2 yield tensile ratio≤0.80
The antidetonation Weather-resistance bridge steel belt roof bolt processing parameter of table 3 yield tensile ratio≤0.80
| Steel plate number | Steel billet number | Heating temperature (DEG C) | Total time inside furnace (min) |
| 1 | A | 500 | 120 |
| 2 | A | 550 | 90 |
| 3 | B | 520 | 150 |
| 4 | B | 600 | 60 |
| 5 | C | 520 | 180 |
| 6 | C | 550 | 120 |
The mechanical property of the antidetonation Weather-resistance bridge steel of table 4 yield tensile ratio≤0.80
Be illustrated in figure 1 the photo of the antidetonation Weather-resistance bridge steel plate microstructure of No. 5 yield tensile ratio≤0.80, be organized as ferrite+bainite, its continuously cast bloom is B, weight percent chemical composition is: C:0.06%, Si:0.26%, Mn:1.25%, P:0.009%, S:0.003%, Cu:0.26%, Cr:0.45%, Ni:0.34%, Nb:0.03%, V:0.02%, Ti:0.015%, Alt:0.026%, and all the other are Fe and inevitable impurity;
Its processing parameter is:
Process furnace heating process: Heating temperature is 1200 DEG C, the time is 3.5 hours, obtains the prior austenite body tissue of fine uniform in steel inside;
Plate mill rolling process: adopt two-phase control rolling technique, roughing broadening 4 passage, recrystallization softening austenite is repeatedly passed through in steel inside, roughing finishing temperature is 1060 DEG C, finish rolling rolling 7 passage, finish rolling start rolling temperature 880 DEG C, finishing temperature is 856 DEG C, and steel inside obtains pancake shape austenite; Roll rear stop 15s, through section cooling, cooling rate 20 DEG C/s, eventually cold red temperature 560 DEG C, steel inside obtains fine ferrite grain and bainite structure, and air cooling is to room temperature subsequently; Tempering temperature is 560 DEG C, total time inside furnace 100min.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (7)
1. an antidetonation Weather-resistance bridge steel, is characterized in that, comprises following component by weight percentage: C:0.04-0.08%, Si:0.15-0.30%, Mn:0.80-1.50%, P :≤0.010%, S :≤0.008%, Cu:0.20-0.45%, Cr:0.30-0.50%, Ni:0.25-0.50%, Nb:0.02-0.04%, V:0.005-0.0.05%, Ti:0.008-0.020%, Alt:0.02-0.05%, all the other are Fe content.
2. a kind of antidetonation Weather-resistance bridge steel according to claim 1, it is characterized in that, chemical composition is by weight percentage: C:0.05%, Si:0.18%, Mn:1.35%, P:0.008%, S:0.002%, Cu:0.35%, Cr:0.35%, Ni:0.27%, Nb:0.02%, V:0.02%, Ti:0.012%, Alt:0.03%, and all the other are Fe.
3. a kind of antidetonation Weather-resistance bridge steel according to claim 1, it is characterized in that, chemical composition is by weight percentage: C:0.06%, Si:0.26%, Mn:1.25%, P:0.009%, S:0.003%, Cu:0.26%, Cr:0.45%, Ni:0.34%, Nb:0.03%, V:0.02%, Ti:0.015%, Alt:0.026%, and all the other are Fe.
4. a kind of antidetonation Weather-resistance bridge steel according to claim 1, it is characterized in that, per-cent chemical composition is according to quantity: C:0.08%, Si:0.29%, Mn:0.90%, P:0.009%, S:0.002%, Cu:0.21%, Cr:0.40%, Ni:0.46%, Nb:0.035%, V:0.01%, Ti:0.018%, Alt:0.04%, and all the other are Fe.
5. produce the manufacturing process of antidetonation Weather-resistance bridge steel described in claim 1 for one kind, comprise converter or the smelting of electric furnace operation, external refining operation, pouring molten steel continuously cast bloom operation, plate mill rolling process and process furnace heating process, is characterized in that, in described process furnace heat treatment step, Heating temperature is 1160-1250 DEG C, and the time is 2-6 hour, and steel inside obtains the prior austenite body tissue of fine uniform.
6. the manufacturing process of antidetonation Weather-resistance bridge steel according to claim 5, it is characterized in that, in described plate mill rolling process, adopt austenite recrystallization district (roughing rolling) and austenite Unhydrated cement (finish rolling rolling) two-phase control rolling technique, 2-4 passage transverse rolling before roughing rolling, by continuously cast bloom broadening to more than 3000mm, and pass through austenite recrystallization fining austenite grains repeatedly; Finish rolling rolling 4-9 passage, finish rolling start rolling temperature 860-920 DEG C, rolls the rear austenite structure obtaining sclerosis; Stop 10-30s after finish rolling, then through ultrafast but cold, cooling rate 5-20 DEG C/s, cold red temperature 500-650 DEG C eventually, air cooling is to room temperature subsequently.
7. the manufacturing process of antidetonation Weather-resistance bridge steel according to claim 5, it is characterized in that, in described process furnace heating process, after heat treatment furnace being heated to 500 ~ 600 DEG C, insulation more than 30min, after furnace temperature is stable, again steel plate is entered stove and carry out tempering heat treatment, the temperature of tempering heat treatment is 500 ~ 600 DEG C, and total time inside furnace (1.5h ~ 2.5h) min, h are steel plate thickness.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107841689A (en) * | 2017-10-19 | 2018-03-27 | 南京钢铁股份有限公司 | A kind of weather-resistant steel plate and its manufacture method |
| CN108950389A (en) * | 2018-07-03 | 2018-12-07 | 舞阳钢铁有限责任公司 | A kind of 490MPa grades of water power steel plates of inexpensive surrender and its production method |
| CN110042309A (en) * | 2019-05-07 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of production method improving wide surface of thin steel sheet quality |
| WO2021196343A1 (en) * | 2020-03-30 | 2021-10-07 | 南京钢铁股份有限公司 | 500 mpa grade low yield ratio weather-resistant bridge steel and manufacturing method therefor |
| CN114182168A (en) * | 2021-11-19 | 2022-03-15 | 南京钢铁股份有限公司 | Ultrahigh-strength wide and thick steel plate containing rare earth and preparation method thereof |
| CN114892082A (en) * | 2022-04-28 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 460 MPa-grade steel plate for ocean engineering and production method thereof |
| CN114892090A (en) * | 2022-05-25 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Production method of Q550-grade high-corrosion-resistance high-strength offshore structure steel |
| WO2023040034A1 (en) * | 2021-09-17 | 2023-03-23 | 南京钢铁股份有限公司 | Micro-molybdenum-type weather-resistant bridge steel plate and preparation method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107841689A (en) * | 2017-10-19 | 2018-03-27 | 南京钢铁股份有限公司 | A kind of weather-resistant steel plate and its manufacture method |
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| CN108950389A (en) * | 2018-07-03 | 2018-12-07 | 舞阳钢铁有限责任公司 | A kind of 490MPa grades of water power steel plates of inexpensive surrender and its production method |
| CN110042309A (en) * | 2019-05-07 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of production method improving wide surface of thin steel sheet quality |
| WO2021196343A1 (en) * | 2020-03-30 | 2021-10-07 | 南京钢铁股份有限公司 | 500 mpa grade low yield ratio weather-resistant bridge steel and manufacturing method therefor |
| WO2023040034A1 (en) * | 2021-09-17 | 2023-03-23 | 南京钢铁股份有限公司 | Micro-molybdenum-type weather-resistant bridge steel plate and preparation method therefor |
| CN114182168A (en) * | 2021-11-19 | 2022-03-15 | 南京钢铁股份有限公司 | Ultrahigh-strength wide and thick steel plate containing rare earth and preparation method thereof |
| CN114892082A (en) * | 2022-04-28 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 460 MPa-grade steel plate for ocean engineering and production method thereof |
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Application publication date: 20160420 |