CN109536835A - Weather-proof low temperature resistant hot-rolled steel section of one kind and preparation method thereof - Google Patents
Weather-proof low temperature resistant hot-rolled steel section of one kind and preparation method 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/18—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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- 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
Abstract
The present invention provides a kind of weather-proof low temperature resistant hot-rolled steel sections and preparation method thereof, the weight percent of the chemical component of the hot-rolled steel section are as follows: 0.07~0.17wt% of C, 0.10~0.40wt% of Si, 0.70~1.25wt% of Mn, P≤0.030wt%, S≤0.020wt%, 0.25~0.60wt% of Cu, 0.40~0.80wt% of Cr, 0.20~0.55wt% of Ni, 0.020~0.055wt% of Nb, 0.010~0.035wt% of Ti, 0.020%~0.070wt% of V, remaining is iron and trace impurity.It is only designed by ingredient appropriate when the present invention rolls and technology controlling and process, intensity can be produced at 400MPa grade, tensile strength, with good impact property, while can resist atmospheric corrosion in 490MPa or more, 1.0 × 10‑ 2The NaHSO of mol/L3When carrying out week leaching test in solution, corrosion weight loss rate of the invention is less than 2.01g/m2/ h, and Q235B corrosion weight loss rate is 3.20-3.50g/m simultaneously2/h.The fashioned iron can have excellent atmospheric corrosion resistance ability in use.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to the weather-proof low temperature resistant hot-rolled steel section of one kind and production method.
Background technique
Fashioned iron is as a vital classification in steel products, and ratio rises year by year in the application of the steel in China.Its
Middle H profile steel, I-steel, angle steel, channel steel and T-steel are widely used with bridge, in steel building, come this year due to
The development of TMCP technology, internal sheet metal credit rating and performance quality have had good improvement, from antidetonation, weather-proof, resistance to low
Temperature impact, high-strength each angle development.But due to the particularity of fashioned iron specification and size, head heavy using TMCP technical difficulty
First each part thickness difference will lead to fashioned iron and irreversible torsion and warpage occur during reheating with Quench,
Secondly powerful stress will cause the tearing of stress concentration region, causes the edge of a wing and web bonding pad underbead crack, makes to subsequent
With causing security risk.Therefore, fashioned iron is very big using TMCP technology production high-performance steel difficulty.
The corrosion of steel is a universal and serious problem, and wherein loss caused by atmospheric corrosion accounts for about all corrosion damages
The half of mistake brings massive losses to national economy.H profile steel majority during military service is directly exposed in atmospheric environment,
So that plain C-Mn steel etching problem is more and more prominent.Weathering steel is exactly that the microelements such as phosphorus, copper, chromium, nickel are added in steel,
So that steel surface is formed the fine and close and very strong protective film of adhesion, hinders corrosion further to spread to matrix, significantly reduce steel
Corrosion rate is widely used to the fields such as manufacture rail truck, bridge, building, pylon, container.Prevent with using coating
Rotten steel construction is compared, and can be reduced environmental pollution using weathering steel, is a kind of green steel with bright prospects.Steel
Low-temperature flexibility is the main safety for influencing to be on active service in the period under steel low temperature environment, in recent years, the low-temperature flexibilities of steel by
The extensive concern of user, under the precondition for guaranteeing steel long life serve, moreover it is possible to guarantee the safety under low temperature environment
It is the choosing for the certainty that steel moves towards green high-efficient safety.
Steel low-temperature flexibility and weather resistance meet simultaneously has larger difficulty, and element is direct from different perspectives in steel
The properties of steel are affected, the addition of weatherability element forms certain influence for low temperature impact properties, and a large amount of alloys add
Enter will lead to steel low-temperature impact toughness variation, while can significantly promote shape and quality in steel material production process
Control difficulty, fashioned iron can not realize excellent Performance Match by heat treatment again, and therefore, the present invention passes through ingredient
The control of Precise spraying and production technology, overcoming weather-proof low temperature resistant fashioned iron production process to be easy to appear, performance is unqualified, product
The uncontrollable problem of surface quality, realizes the production of weather-proof low temperature resistant fashioned iron.
Chinese patent CN102618781A provides a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof, described
The weight percent of the chemical component of hot-rolled H-shaped steel for low temperature-resisting structure are as follows: C%0.12~0.22wt%, Si% 0.10~
0.40wt%, Mn%1.1~1.50wt%, P%≤0.025wt%, S%≤0.025wt%, V%0.01~0.05wt%,
Remaining is iron and trace impurity.The invention mainly passes through reduction sulfur content, and microalloying mainly applies vanadium, do not add other
Element, continuous casting process is using immersion flat mouth of a river full guard casting.Do not use aluminium deoxidation.- 20 DEG C of impact of collision function are flat
Equal 90J.Being different from the present invention is a little: 1) production technology is different, 2) deoxidation mode is different) 3) roll control technology it is different, 4) at
Set up that meter is different, 5) performance is more of the invention low and is not directed to -45 DEG C of steel longitudinal Charpy impacts separately.
Chinese patent CN1265710A describes a kind of solderable boron-containing steel of the superhigh intensity with excellent toughness, special
Sign is the tensile strength of steel at least about 900MPa (130ksi), is measured using Xia Shi v-notch impact specimen at -40 DEG C
Toughness at least 120 joules of its microscopic structures mainly include by basic non-recrystallization austenite grain transformation from fine grain
Lower bainite, fine grain lath martensite or more than the mixing organized, the manufacturing process of the steel is described as follows: extremely by heating of plate blank
Slab is thinned to steel plate by one or multi-channel hot rolling in the first temperature range that austenite recrystallizes by suitable temperature；
Then in the second temperature for starting to transform to ferrite temperature lower than above-mentioned first temperature range and higher than cooling period austenite
Above-mentioned steel plate is continued to be thinned by one or multi-channel hot rolling in section；Above-mentioned steel plate quenching to a suitable quenching is ended warm
Degree；Stop quenching, above-mentioned steel plate is air-cooled to room temperature.H profile steel microscopic structure ferrite and pearlite of the present invention, and
Controlled rolling and heat treatment are not needed, is a kind of low-cost high-toughness steel.
Summary of the invention
The object of the present invention is to provide a kind of weather-proof low temperature resistant hot-rolled steel section and preparation method thereof, present invention rollings
When only designed by ingredient appropriate and technology controlling and process, intensity can be produced at 400MPa grades, tensile strength is in 490 MPa or more
With good impact property, while atmospheric corrosion can be resisted, 1.0 × 10-2The NaHSO of mol/L3All leachings are carried out in solution
When test, corrosion weight loss rate of the invention is less than 2.01g/m2/ h, and Q235B corrosion weight loss rate is 3.20-3.50g/m simultaneously2/
h.The fashioned iron can have excellent atmospheric corrosion resistance ability in use.
To achieve the goals above, present invention employs the following technical solutions:
A kind of weather-proof low temperature resistant hot-rolled steel section, the weight percent of the chemical component of the hot-rolled steel section are as follows: C 0.07~
0.10~0.40wt% of 0.17wt%, Si, 0.70~1.25wt% of Mn, P≤0.030wt%, S≤0.020wt%, Cu
0.25~0.60wt%, 0.40~0.80wt% of Cr, 0.20~0.55wt% of Ni, 0.020~0.055wt% of Nb, Ti
0.010~0.035wt%, 0.020%~0.070wt% of V, remaining is iron and trace impurity.
A kind of preparation method of above-mentioned weather-proof low temperature resistant hot-rolled steel section, the preparation method include the following steps:
1) converter smelting:
Alloying is carried out using copper particle, nickel plate, low-carbon ferromanganese, low-carbon ferrochromium, silicomanganese, ferro-niobium, VN alloy；Molten steel goes out
2~5kg of deoxidier aluminium manganese iron steel per ton is added with steel stream when steel a quarter to molten steel goes out to one third；
2) LF refining:
LF refining is added lime 8-12kg/t steel, calcium carbide 3.0kg/t steel, Si-Ca-Ba 3.0kg/t steel and carries out deoxidation slag making,
Refining slag must assure that CaO/SiO2> 2.20；
0.7~1.4kg/t of titanium wire steel is fed in steel when [O]≤15ppm and increases titanium, linear velocity > 3m/s；
The aluminum steel of 0.4~0.75kg/t steel is fed according to [Al] content of T in steel before refining soft blow and argon gas stirs；
Then the calcium line of 0.5~1kg/t steel is fed according to T [Al] content；
3) continuous casting, rolling.
Preferably, in continuous casting step, baking of tundish temperature is 1100 ± 50 DEG C, and crystallizer uses immersion to arc
The casting of mouth of a river full guard；Wherein, two is cold using weak cold, and crystallizer uses non-sinusoidal oscillation, and tundish is using carbon-free alkalinity covering
Agent, coverture additional amount are 1~1.5kg/t steel；
Wherein, the tundish degree of superheat is by 20~30 DEG C of controls, and the first furnace temperature of middle packet is controlled at 1540~1550 DEG C, even
Heat control is poured at 1536~1546 DEG C, pulling rate is 0.75~0.95m/min.
Preferably, in continuous casting step, slab waits the base that cools to carry out reheating by the cold carry out slow cooling of heap；It is secondary to add
When hot, heating temperature is 1250-1280 DEG C, and total heating time control is between 180-240min；Overall compression ratio 3.5, rolling speed
Rate≤4.5m/s；Cold bed cooling rate≤1.0 DEG C/S.
Specifically, present invention is alternatively directed to provide a kind of based on weather-proof in the problems in ingredient, smelting and operation of rolling
Hot-rolled H-shaped steel for low temperature-resisting structure preparation method, low temperature resistant steel mechanical property of the invention is good, -20 DEG C of impact value >=100
Joule, -40 DEG C >=50 joules.
The preparation method comprises the following steps: molten iron pre-desulfurization, converter just makes steel water, molten steel is tapped to ladle, ladle
Refining, billet caster continuous casting, the medium-sized H profile steel rolling of AR method.Wherein:
1, the full fritting synthetic slag of 2~3kg/t steel is added when molten steel is tapped.
2, aluminium manganese iron 2.5~4kg/t steel is added when molten steel is tapped.
3. feeding 0.7~1.4kg/t of titanium wire steel in steel when [0]≤15ppm increases titanium.
4, the aluminum steel of refining feeding 0.4~0.75kg/t steel and 2~3min of big argon gas amount stirring.
5,0.5~1kg/t of calcium line steel is fed.
6, in continuous casting step, baking of tundish temperature is 1100 DEG C, full guard casting.
7, carbon-free alkaline covering agent, coverture additional amount are 1~1.5kg/t steel.
8, the tundish degree of superheat is by 20~30 DEG C of controls, and the first furnace temperature of middle packet is controlled at 1540~1550 DEG C, and furnace pours in company
For secondary control at 1536~1546 DEG C, casting blank specification is (275~320) × (375~410) mm, and pulling rate is 0.70~0.85m/
min。
9, controlled rolling rhythm and deflection are not necessarily to when rolling, without special cooling technique when cooling.
More specifically,
A kind of preparation method of above-mentioned weather-proof low temperature resistant hot-rolled steel section, the preparation method include the following steps:
1, molten steel tapping starts to before tapping that the full fritting synthetic slag of 2~3kg/t steel, full fritting is added between a quarter
The group of synthetic slag is divided into SiO2%0~3wt%, CaO%48~60wt%, Al2O3%42~50wt%, TFe%0~3wt%.
2, alloying is carried out using copper particle, nickel plate, mid-carbon fe-mn, medium carbon ferrochrome, silicomanganese, ferro-niobium, VN alloy.Molten steel
Deoxidier aluminium manganese iron 2.5~4kg/t steel is added when going out to molten steel to one third in a quarter of tapping.
3, ladle enters the station, and lime 8-12kg/t steel, calcium carbide 3.0kg/t steel, Si-Ca-Ba (silico-calcium) 3.0kg/t is added in refining
Steel carries out deoxidation slag making.
4,0.7~1.4kg/t of titanium wire steel is fed in steel when [O]≤15ppm and increases titanium, linear velocity > 3m/s.Titanium wire index are as follows:
C%0~5wt%, SiO2%0~5wt%, P%0~0.10wt%, S%0~0.040wt%, Ti%30~38%. remaining
For iron and trace impurity.
5, aluminum steel and the big argon gas according to [Al] content of T in steel feeding 0.4~0.75kg/t steel are fed before refining soft blow
Amount stirring 2min.The index of aluminum steel are as follows: Al% >=95wt%, remaining is trace impurity.
6, the calcium line of 0.5~1kg/t steel is fed according to T [Al] content.Calcium line index are as follows: Ca% >=98wt%, remaining is
Trace impurity.
7, baking of tundish temperature is 1100 DEG C, and crystallizer is poured arc using submersed nozzle full guard.
8, two is cold using weak cold, and crystallizer uses non-sinusoidal oscillation, and tundish uses carbon-free alkaline covering agent, coverture
Additional amount is 1~1.5kg/t steel, and the ingredient of coverture is SiO20~8%wt%, CaO 45~60wt%, Al2O330~
40wt%, Fe2O30~3wt%, MgO%0~5wt%.
9, wherein, which is 1516.2 DEG C, and the tundish degree of superheat is by 20~30 DEG C of controls, middle packet the
One furnace temperature is controlled at 1540~1550 DEG C, and heat control is poured at 1536~1546 DEG C by company, casting blank specification be (275~320) ×
(375~410) mm, pulling rate are 0.70~0.85m/min.
10, controlled rolling rhythm and deflection are not necessarily to when rolling, without special cooling technique when rolled piece is cooling.
The present invention mainly passes through ingredient design, copper chromium nickel niobium vanadium titanium-combined microalloying, aluminium deoxidation, steel inclusion control
Technology processed achievees the purpose that improve that steel are corrosion-resistant is provided simultaneously with superior low-temperature performance.
According to embodiments of the present invention, the weight percent of the chemical component based on weather-proof low temperature resistant hot-rolled steel section are as follows: C%
0.07~0.11wt%, Si%0.20~0.40wt%, Mn%1.05~1.25wt%, P%≤0.030wt%, S%≤
0.015wt%, Cu%0.25~0.45wt%, Cr%0.40~0.55wt%, Ni%0.20~0.35wt%, Nb% 0.020
~0.035wt%, Ti%0.010~0.035wt%, V%0.020%~0.040wt%, remaining is iron and trace impurity.
Preferably, the weight percent based on weather-proof hot-rolled H-shaped steel for low temperature-resisting structure chemical component are as follows: C%
0.08~0.11wt%, Si%0.25~0.40wt%, Mn%1.05~1.25wt%, P%≤0.025wt%, S%≤
0.015wt%, Cu%0.25~0.45wt%, Cr%0.40~0.55wt%, Ni%0.20~0.35wt%, Nb% 0.020
~0.035wt%, Ti%0.010~0.035wt%, V%0.020%~0.040wt%, remaining is iron and trace impurity.
According to embodiments of the present invention, the preparation method of weather-proof low temperature resistant structure H profile steel includes desulfurization, converter smelting (example
Such as, 50 tons of top-blown converters are smelted), LF refining, billet continuous casting, rolling (for example, 1-7 milling train layout pattern production line rolls).
This ingredient design feature be low carbon content, copper, chromium, nickel, niobium, vanadium, titanium it is compound, using aluminium deoxidation, fritting wash heat etc.
Technology controlling and process Molten Steel Cleanliness.It when controlled rolling means are low, keeps stablizing low-temperature flexibility and weather resistance, realize big
Batch steady production.
The unmentioned process of the present invention, can be used the prior art.
The present invention will be further described combined with specific embodiments below, but not limited to this.
The beneficial effects of the present invention are:
The present invention provides weather-proof low temperature resistant structure H profile steel of one kind and preparation method thereof, and the method does not need to control when rolling
It is cold to roll control, is only designed by ingredient appropriate and technology controlling and process, intensity can be produced in 400MPa or more, -20 DEG C of impact values >=
100J, -40 DEG C >=50J joules of weather-proof low temperature resistant hot rolled H-shaped, the present invention are mainly designed by ingredient；Multiphase microalloying
Elemental copper, chromium, nickel, niobium, vanadium, titanium are micro compound, and steel process is put in converter keeps steel low using techniques such as aluminium deoxidation, fritting wash heat
Warm nature can obtain good control.
Specific embodiment
Below with reference to specific implementation example, the invention will be further described, but the present invention is not therefore confined to reality
Apply example description within the scope of.
Embodiment one:
Heat (batch) number: Y164-8526, molten steel composition are C 0.10wt%, Si 0.28wt%, Mn 1.16wt%, P
0.018wt%, S≤0.002wt%, Nb 0.032wt%, Ti 0.011wt%, Cr 0.42wt%, Ni 0.26wt%, Cu
0.25wt%, V 0.034wt%.
1, molten steel tapping starts to before tapping that the full fritting synthetic slag of 2kg/t steel is added between a quarter, fuses into advance entirely
The group of slag is divided into SiO2%1.86wt%, CaO%52.10wt%, Al2O3%44.69wt%, TFe%1.35wt%.
2, molten steel taps when a quarter goes out to molten steel to one third and deoxidier aluminium manganese iron 3.0kg/t steel is added.
3, ladle enters the station, and lime 8.5kg/t steel, calcium carbide 3.0kg/t steel, Si-Ca-Ba (silico-calcium) 3.0kg/t is added in refining
Steel carries out deoxidation slag making.
4, feeding titanium wire 3m/t steel increases titanium when [0] is 12ppm in steel.Titanium wire index are as follows: C%2.37wt%, SiO2%
3.16wt%, P%0.008wt%, S%0.033wt%, Ti%34.5%.Remaining is iron and trace impurity.
5, it feeds the aluminum steel of 0.55kg/t steel and big argon gas amount stirs 2min.The index of aluminum steel are as follows: Al%98wt%,
Remaining is trace impurity.
6, the calcium line of 0.63kg/t steel is fed according to T [Al] content.Calcium line index are as follows: Ca%99%wt%, remaining is micro-
Measure impurity.
7, baking of tundish temperature is 1100 DEG C, and crystallizer is poured arc using submersed nozzle full guard.
8, continuous casting two cold uses weak cold, and crystallizer uses non-sinusoidal oscillation, and tundish uses carbon-free alkaline covering agent, covers
Lid agent additional amount is 1.2kg/t steel, the ingredient SiO of coverture2%3.18wt%, CaO%54.66wt%, Al2O3%
35.59%wt%, Fe2O3%1.85wt%, MgO%4.95wt%.
9, wherein, which is 1516.2 DEG C, and the tundish degree of superheat is by 20~30 DEG C of controls, middle packet the
One furnace temperature is controlled at 1540~1550 DEG C, and heat control is poured at 1536~1546 DEG C by company, and casting blank specification is 240 × 375mm,
Pulling rate is 0.75~0.85mmin-1。
10, by gained continuous casting billet H profile steel medium section mill carry out AR rolling, gained material object specification be H300 × 150 ×
6.5 × 9, H194 × 150 × 6 × 9, H200 × 200 × 8 × 12 specifications, mechanical property and impact property are shown in Table 1.
1 different size H profile steel performance of table
11, the test method recommended according to TB/T2375-98 is sampled inspection to stocking, and size of sample 60 × 40 ×
4mm, 10-2The NaHSO of mol/l3Test is compared in solution, by 72 hours altemate dry and wet tests, the test steel of survey was rotten
Erosion weight loss rate is 1.95g/m2/ h, and Q235B corrosion weight loss rate is 3.24g/m simultaneously2/ h has good corrosion-resistant energy
Power.
Embodiment two:
Heat (batch) number: Y174-3354, molten steel composition are C 0.08wt%, Si 0.26wt%, Mn 1.10wt%, P
0.015wt%, S≤0.002wt%, Nb0.030wt%, Ti 0.013wt%, Cr 0.42wt%, Ni 0.25wt%, Cu
0.24wt%, V 0.032wt%.
1, molten steel tapping starts to before tapping that the full fritting synthetic slag of 2kg/t steel is added between a quarter, fuses into advance entirely
The group of slag is divided into SiO2%1.86wt%, CaO%52.10wt%, Al2O3%44.69wt%, TFe%1.35wt%.
2, molten steel taps when a quarter goes out to molten steel to one third and deoxidier aluminium manganese iron 3.0kg/t steel is added.
3, ladle enters the station, and lime 8.5kg/t steel, calcium carbide 3.0kg/t steel, Si-Ca-Ba (silico-calcium) 3.0kg/t is added in refining
Steel carries out deoxidation slag making.
4, feeding titanium wire 3m/t steel increases titanium when [0] is 10ppm in steel.Titanium wire index are as follows: C%2.37wt%, SiO2%
3.16wt%, P%0.008wt%, S%0.033wt%, Ti%34.5%.Remaining is iron and trace impurity.
5, it feeds the aluminum steel of 0.55kg/t steel and big argon gas amount stirs 2min.The index of aluminum steel are as follows: Al%98wt%,
Remaining is trace impurity.
6, in the rear calcium line for feeding 0.65kg/t steel according to T [Al] content.Calcium line index are as follows: Ca%99%wt%, remaining
For trace impurity.
7, baking of tundish temperature is 1100 DEG C, and crystallizer is poured arc using submersed nozzle full guard.
8, continuous casting two cold uses weak cold, and crystallizer uses non-sinusoidal oscillation, and tundish uses carbon-free alkaline covering agent, covers
Lid agent additional amount is 1.2kg/t steel, the ingredient SiO of coverture23.18%wt%, CaO 54.66wt%, Al2O3
35.59wt%, Fe2O31.85wt%, MgO%4.95wt%.
9, wherein, which is 1516.2 DEG C, and the tundish degree of superheat is by 20~30 DEG C of controls, middle packet the
One furnace temperature is controlled at 1540~1550 DEG C, and heat control is poured at 1536~1546 DEG C by company, and casting blank specification is 275 × 380mm,
Pulling rate is 0.70~0.80m/min.
10, gained continuous casting billet is subjected to AR rolling in H profile steel medium section mill, gained material object specification is
H294×200×8×12、H350×175×7×11。
Its mechanical property and impact property are shown in Table 2.
2 different size H profile steel performance of table
11, the test method recommended according to TB/T2375-98 is sampled inspection to stocking, and size of sample 60 × 40 ×
4mm, 10-2The NaHSO of mol/l3Test is compared in solution, by 72 hours altemate dry and wet tests, the test steel of survey was rotten
Erosion weight loss rate is 2.01g/m2/ h, and Q235B corrosion weight loss rate is 3.25g/m simultaneously2/ h has good corrosion-resistant energy
Power.
Technological parameter (such as temperature, time) section bound value of the invention and interval value can realize this law,
Embodiment numerous to list herein.
Ordinary skill in the art knowledge can be used in the unspecified content of the present invention.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (5)
1. a kind of weather-proof low temperature resistant hot-rolled steel section, which is characterized in that the weight percent of the chemical component of the hot-rolled steel section are as follows:
0.07~0.17wt% of C, 0.10~0.40wt% of Si, 0.70~1.25wt% of Mn, P≤0.030wt%, S≤
0.25~0.60wt% of 0.020wt%, Cu, 0.40~0.80wt% of Cr, 0.20~0.55wt% of Ni, Nb 0.020~
0.010~0.035wt% of 0.055wt%, Ti, 0.020%~0.070wt% of V, remaining is iron and trace impurity.
2. weather-proof low temperature resistant hot-rolled steel section according to claim 1, which is characterized in that the chemical component of the hot-rolled steel section
Weight percent are as follows: 0.08~0.11wt% of C, 0.25~0.40wt% of Si, 1.05~1.25wt% of Mn, P≤
0.025wt%, S≤0.25~0.45wt% of 0.015wt%, Cu, 0.40~0.55wt% of Cr, 0.20~0.35wt% of Ni,
0.020~0.035wt% of Nb, 0.010~0.035wt% of Ti, 0.020%~0.040wt% of V, remaining is iron and micro miscellaneous
Matter.
3. the preparation method of weather-proof low temperature resistant hot-rolled steel section as claimed in claim 1 or 2, the preparation method include the following steps:
1) converter smelting:
Alloying is carried out using copper particle, nickel plate, low-carbon ferromanganese, low-carbon ferrochromium, silicomanganese, ferro-niobium, VN alloy；Molten steel is tapped four points
One of 2~5kg of deoxidier aluminium manganese iron steel per ton is added with steel stream when going out to molten steel to one third；
2) LF refining:
LF refining is added lime 8-12kg/t steel, calcium carbide 3.0kg/t steel, Si-Ca-Ba 3.0kg/t steel and carries out deoxidation slag making, refining
Slag must assure that CaO/SiO2> 2.20；
0.7~1.4kg/t of titanium wire steel is fed in steel when [O]≤15ppm and increases titanium, linear velocity > 3m/s；
The aluminum steel of 0.4~0.75kg/t steel is fed according to [Al] content of T in steel before refining soft blow and argon gas stirs；
Then the calcium line of 0.5~1kg/t steel is fed according to T [Al] content；
3) continuous casting, rolling.
4. preparation method according to claim 3, which is characterized in that in continuous casting step, baking of tundish temperature is
1100 ± 50 DEG C, crystallizer is poured arc using submersed nozzle full guard；Wherein, two is cold using weak cold, and crystallizer is using non-
Sinusoidal vibration, tundish use carbon-free alkaline covering agent, and coverture additional amount is 1~1.5kg/t steel；
Wherein, the tundish degree of superheat is by 20~30 DEG C of controls, and the first furnace temperature of middle packet is controlled at 1540~1550 DEG C, and heat pours in company
At 1536~1546 DEG C, pulling rate is 0.75~0.95m/min for control.
5. preparation method according to claim 3, which is characterized in that in continuous casting step, slab is delayed by the way that heap is cold
It is cold, wait the base that cools to carry out reheating；When reheating, heating temperature is 1250-1280 DEG C, and total heating time control is in 180-
Between 240min；Overall compression ratio 3.5 rolls rate≤4.5m/s；Cold bed cooling rate≤1.0 DEG C/S.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110565011A (en) * | 2019-06-17 | 2019-12-13 | 南阳汉冶特钢有限公司 | q345qENH weather-proof bridge steel plate with thickness less than or equal to 50mm and production method thereof |
| CN113462972A (en) * | 2021-06-21 | 2021-10-01 | 山东钢铁股份有限公司 | Quenching and tempering high-strength low-temperature-resistant H-shaped steel for ocean engineering and preparation method thereof |
| CN113652599A (en) * | 2021-07-01 | 2021-11-16 | 河钢股份有限公司承德分公司 | High-strength corrosion-resistant cold-resistant hot-rolled steel coil and production method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001020036A (en) * | 1999-07-08 | 2001-01-23 | Nkk Corp | Wide flange shape for timbering excellent in weather resistance |
| CN101845602A (en) * | 2009-03-26 | 2010-09-29 | 宝山钢铁股份有限公司 | High-performance weather-proof building structural steel and manufacturing method thereof |
| CN103540844A (en) * | 2013-10-28 | 2014-01-29 | 莱芜钢铁集团有限公司 | Low temperature resistant H-shaped steel and production method thereof |
-
2018
- 2018-12-07 CN CN201811495530.2A patent/CN109536835A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001020036A (en) * | 1999-07-08 | 2001-01-23 | Nkk Corp | Wide flange shape for timbering excellent in weather resistance |
| CN101845602A (en) * | 2009-03-26 | 2010-09-29 | 宝山钢铁股份有限公司 | High-performance weather-proof building structural steel and manufacturing method thereof |
| CN103540844A (en) * | 2013-10-28 | 2014-01-29 | 莱芜钢铁集团有限公司 | Low temperature resistant H-shaped steel and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110565011A (en) * | 2019-06-17 | 2019-12-13 | 南阳汉冶特钢有限公司 | q345qENH weather-proof bridge steel plate with thickness less than or equal to 50mm and production method thereof |
| CN113462972A (en) * | 2021-06-21 | 2021-10-01 | 山东钢铁股份有限公司 | Quenching and tempering high-strength low-temperature-resistant H-shaped steel for ocean engineering and preparation method thereof |
| CN113652599A (en) * | 2021-07-01 | 2021-11-16 | 河钢股份有限公司承德分公司 | High-strength corrosion-resistant cold-resistant hot-rolled steel coil and production method and application thereof |
| CN113652599B (en) * | 2021-07-01 | 2022-07-29 | 河钢股份有限公司承德分公司 | High-strength corrosion-resistant cold-resistant hot-rolled steel coil and production method and application thereof |
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