CN109252012A - A kind of Weather-resistance bridge steel and smelting process - Google Patents
A kind of Weather-resistance bridge steel and smelting process Download PDFInfo
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- CN109252012A CN109252012A CN201811323097.4A CN201811323097A CN109252012A CN 109252012 A CN109252012 A CN 109252012A CN 201811323097 A CN201811323097 A CN 201811323097A CN 109252012 A CN109252012 A CN 109252012A
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- C22C33/00—Making ferrous alloys
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- C22C33/06—Making ferrous alloys by melting using master alloys
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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- 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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Abstract
The invention discloses a kind of Weather-resistance bridge steel, are related to iron and steel smelting technology field, and chemical component and mass percent are as follows: C:0.36% 0.39%, Si:0.10% 0.25%, Mn:0.65% 0.75%, S≤0.005%, P≤0.010%, Cr:0.95% 1.05%, Ni:1.00% 1.10%, Cu:0.30% 0.40%, Mo:0.27% 0.35%, V:0.20% 0.30%, A1:0.015% 0.035%.The present invention accurately controls tissue by ingredient, rolling, the improvement of heat treatment process and innovation, to obtain higher performance requirement, tough, modeling with high-quality steel prolong, form, welding, abrasion, high temperature, the characteristics such as antifatigue.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, more particularly to a kind of Weather-resistance bridge steel and smelting process.
Background technique
It is well known that low-alloyed weathering steel is widely used in railway, vehicle, bridge, pylon, photovoltaic, high speed engineering etc.
It is chronically exposed to steel construction used in atmosphere.For manufacturing container, rail truck, oil derrick, harbour building, recovering the oil and put down
The structural members such as container of sulfide hydrogen corrosive medium in platform and chemical petroleum equipment, it has also become important material.These weather-proof bridges
What joist steel was born is cyclic loading complicated and changeable, it is also necessary to the Nature climatic environment is adapted to, thus to its corrosion resistance and power
Learning the indexs such as performance, more stringent requirements are proposed.
By adding a small amount of alloying element, its atmospheric corrosion resistance is made to obtain a kind of low-alloy steel being obviously improved.It
It can effectively block corrosive medium infiltration and transmission using from the rusty scale formed in surface, reduce the corruption in atmospheric environment
Lose speed.People in 1900 begin to focus on effect of the different-alloy element to steel atmospheric corrosion resistance ability；Nineteen twenty U.S.'s steel
Inland Steel (USS) carries out large-scale light exposure test and shows the low-alloy steel containing amount of copper, phosphorus, nickel, chromium with excellent
Atmospheric corrosion resistance；1933, United States Steel Corporation succeeded in developing CortenB series weathering steel, and corrosion resistance is about
It is 4-8 times of carbon steel.Steel bridge has more advantage, and weathering steel separately has the advantage of antirust maintenance.The comprehensive method of investment, is supported at operation
It protects, repair, putting the factors such as processing, carbon emission, service life aside as useless, Japan builds the reckoning of province building research institute as the result is shown: after 60 years
In 2 times or more after commonly steel bridge expense is 1.5 times, 100 years of weather-proof steel bridge.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of Weather-resistance bridge steel, chemical component and mass percent are such as
Under: C:0.36% 0.39%, Si:0.10% 0.25%, Mn:0.65% 0.75%, S≤0.005%, P≤0.010%, Cr:
0.95% 1.05%, Ni:1.00% 1.10%, Cu:0.30% 0.40%, Mo:0.27% 0.35%, V:0.20% 0.30%,
A1:0.015%〜0.035%。
Technical effect: the present invention accurately controls tissue by ingredient, rolling, the improvement of heat treatment process and innovation, thus
Obtain higher performance requirement.The elements such as a small amount of copper, nickel are added when smelting and increase its corrosion resistance, add a small amount of vanadium refinement crystal grain
And uniform formation, tough, modeling with high-quality steel prolong, form, welding, abrasion, high temperature, the characteristics such as antifatigue.
The technical solution that the present invention further limits is:
A kind of preceding Weather-resistance bridge steel, chemical component and mass percent are as follows: C:0.38%, Si:0.18%, Mn:
0.70%, S:0.003%, P:0.009%, Cr:0.98%, Ni:1.02%, Cu:0.32%, Mo:0.30%, V:0.23%, AL:0.20%.
A kind of preceding Weather-resistance bridge steel, chemical component and mass percent are as follows: C:0.38%, Si:0.20, Mn:
0.72%, S:0.004%, P:0.008%, Cr:1.00%, Ni:1.03%, Cu:0.35%, Mo:0.31%, V:0.25%, AL:0.25%.
A kind of preceding Weather-resistance bridge steel, chemical component and mass percent are as follows: C:0.37%, Si:0.17%,
Mn:0.68%, S:0.003%, P:0.007%, Cr:1.02%, Ni:1.05%, Cu:0.36%, Mo:0.29%, V:0.24%, AL:
0.26%。
Another object of the present invention is to provide a kind of Weather-resistance bridge steel smelting techniques, specifically include: electric furnace smelting process,
Refining furnace refining procedure, vacuum drying oven degassing process and continuous casting process,
In electric furnace smelting process, it is incorporated molten iron and steel scrap, wherein molten iron accounts for 40% the 60% of furnace charge total amount, supplies using coherent oxygen lance
Oxygen decarburization and slag making dephosphorization, melting down ingredient are controlled by P≤0.006%, reach 1610 DEG C of 1680 DEG C of tappings of tapping temperature, tapping
Preceding 2 minutes oxygen feeding stops, adding deoxygenation furnace-curing agent reduces the oxygen content of molten steel in electric furnace, and aluminium is added alloying process early period in tapping
Ball, alloy and outsole stir to molten steel just deoxidation；
In refining furnace refining procedure, refining furnace adds sial calcium diffusive deoxidation to make white slag, deep deoxidation, desulfurization, according to sampling ingredient point
Alloy adjusting component is added in analysis, and into 1630 DEG C 1640 DEG C of true temp, ingredient enters vacuum drying oven after meeting steel grades requirement
Processing；
Vacuum drying oven degassing process, rough vacuum 0.5mbar 1mbar keep 18min or more, determine hydrogen after vacuum breaker, and guarantee [H]≤
2ppm, vacuum breaker sample after determining hydrogen, feed aluminum steel according to aluminium component, feed aluminum steel 40m 60m, feed after stirring 2min 3min
Enter it is quiet after pure calcium pump core-spun yarn 80m 100m stir time 15min 35min, carbon-free covering agent 100kg is added in quiet process of stirring
200kg, 1550 DEG C 1570 DEG C of bull ladle temperature upper continuous castings are poured；
Continuous casting process, casting process are poured using full guard, and ladle to tundish seals molding casting using long nozzle argon, in
Between packet to crystallizer use submersed nozzle molding casting, molten steel uses carbon-free covering agent, carbon covering slag in crystallizer in middle packet；
The process control of continuous casting process includes control intensity of cooling, mold oscillation and stirring parameter, control continuous casting billet drawing
Speed and molten steel temperature in tundish.
Further, continuous casting process, continuous casting perseverance casting speed control 2.0m/min, continuous casting, which is opened, pours furnace tundish degree of superheat control
It makes control intensity of cooling in 25 DEG C 40 DEG C, continuous casting process and uses secondary cooling system, it is right during continuous casting
Slab sub-sectional cooling is divided into a cooling section, secondary cooling section, and a cooling section is cooling for crystallizer, and mold liquid level uses
Full-automatic level detection, the shake journey of crystallizer are less than 5mm, and secondary cooling section is cooling using aerosol；Stirring parameter is crystallization
The parameter of magnetic stirrer coil used by device, casting blank solidification end.
The beneficial effects of the present invention are:
(1) present invention in silicon be deoxidation in steel making essential elements, it may have certain solution strengthening effect, in the present invention by silicon
It is limited in the range of 0.10 0.25%；
(2) manganese has the function of postponing in steel austenite to ferritic transformation in the present invention, to thinning microstructure, improve intensity with
Toughness is advantageous；When the content of manganese is lower, and above-mentioned effect is not significant, and armor plate strength and toughness are relatively low etc., therefore manganese content in the present invention
Control is in the range of 0.65 0.75%；
(3) chromium is the element for improving steel hardenability in the present invention, is able to suppress the formation of polygonal ferrite and pearlite, is promoted
The transformation of cryo tissue bainite or martensite improves the intensity of steel；Within the scope of low-alloy, there is very big reinforcing to make steel
With, raising intensity, hardness and wearability, but Cr too high levels will affect the toughness of steel, and cause temper brittleness, chromium in the present invention
Content is controlled 0.95 1.05%；
(4) toughness of steel can be improved in nickel in the present invention, while can inhibit corrosion of the chloride ion to steel, can also improve copper
The caused red brittleness in steel, but nickel is that precious metal largely adds and can sharply increase cost, and influences welding performance, according to
It is required that adding appropriate amount, nickel content control is in the range of 1.00 1.10% in the present invention；
(5) copper is the effective element for not reducing toughness raising intensity in the present invention, while improving the weather resistance of steel, but copper meeting
Cause red brittleness in steel, thus in the present invention copper content control in the range of 0.30 0.40%；
(6) Mo can increase hardening with Cr in the same manner as in the present invention, will increase cost when largely adding, and reduce toughness and solderable
Property, it is limited in 0.70% or less；When tempering, carbide particle is formed, to be conducive to precipitation strength, therefore molybdenum contains in the present invention
Amount control is in the range of 0.27 0.35%；
(7) aluminium is deoxidant element in the present invention, while can refine crystal grain, if aluminium content is too small, effect is not significant, if aluminium content
It is excessive, it easily forms oxide and is mingled with, therefore aluminium content controls in the range of 0.015 0.035% in the present invention；
(8) in the present invention vanadium be steel excellent deoxidier, a small amount of vanadium is added can improve the welding performance of low-alloy steel significantly,
Can thinning microstructure crystal grain, improve intensity and toughness, resistant to hydrogen corrosion energy can be improved in the carbide that vanadium and carbon are formed at high temperature under high pressure
Power, therefore content of vanadium controls in the range of 0.20 0.30% in the present invention；
(9) present invention according to the performance requirement of Weather-resistance bridge steel elemental gas can be controlled respectively [O]≤20ppm, [N]≤
80ppm,[H]≤2ppm；
(10) slab can be gone out by 25 40 DEG C of the degree of superheat, permanent pulling rate 2.0m/min, secondary cooling etc. by straightening temperature in the present invention
Degree control is being greater than 1000 DEG C or more, effectively avoids low-temperature space and cracks；
(11) Calcium treatment is carried out by feeding silk thread mode after vacuum in the present invention；Its effect generated is: deoxidation and desulfurization, calcium
Have very strong affinity with oxygen and sulphur, with oxygen and sulphur content not Sheng Cheng CaO and CaS, therefore Calcium treatment is in deep deoxidation and deep de-
There is good effect in terms of sulphur；Inclusion modification, the A1 that group variety shape is distributed203It is mingled with the calcium aluminate of denaturation glomeration distribution
(mCa0nA1203) be mingled with, the mechanical performance of steel can be improved, it is most important for the wire rod and strip of small bore, it will lead to
The anisotropic plasticity MnS of steel is mingled with the CaS(for being changed into spherical distribution or even restores Mn), and often it is wrapped in calcium aluminate folder
It is miscellaneous；Nozzle clogging is prevented, aluminum killed steel, usually can be because of A1 when carrying out continuous casting203It is deposited on the mouth of a river and leads to the stifled of the mouth of a river
Plug, i.e., so-called nozzle clogging, when carrying out Calcium treatment to steel, the mCaOnA1 of generation203It can be divided by the difference of component several
Kind, such as C2A、C12A7、CA、CA2、CA6Deng these are mingled with the feature with low melting point, C therein12A7Fusing point down to 1415 DEG C,
It is mingled with for liquid without being deposited at the mouth of a river under molten steel temperature, to prevent the generation of dross phenomenon, these liquid are spherical
It is mingled with and is also easier to float, so that the aspect that is mingled with total in reducing steel also brings help.
Specific embodiment
Embodiment 1
A kind of Weather-resistance bridge steel provided in this embodiment, chemical component and mass percent are as follows: C:0.38%, Si:0.18%,
Mn:0.70%, S:0.003%, P:0.009%, Cr:0.98%, Ni:1.02%, Cu:0.32%, Mo:0.30%, V:0.23%, AL:
0.20%。
Its smelting process, specifically includes: electric furnace smelting process, refining furnace refining procedure, vacuum drying oven degassing process and continuous casting
Process is poured,
In electric furnace smelting process, it is incorporated molten iron and steel scrap, wherein molten iron accounts for the 46% of furnace charge total amount, supplies oxygen using coherent oxygen lance de-
Carbon and slag making dephosphorization, melting down ingredient are controlled by P≤0.006%, reach 1630 DEG C of tapping temperature tappings, are tapped first 2 minutes and are stopped
Oxygen supply, adding deoxygenation furnace-curing agent reduces the oxygen content of molten steel in electric furnace, and tapping is added aluminum shot alloying process early period, alloy and big
Bottom stirs to molten steel just deoxidation；
In refining furnace refining procedure, refining furnace adds sial calcium diffusive deoxidation to make white slag, deep deoxidation, desulfurization, according to sampling ingredient point
Alloy adjusting component is added in analysis, and into 1635 DEG C of true temp, ingredient enters vacuum drying oven processing after meeting steel grades requirement；
Vacuum drying oven degassing process, rough vacuum 0.5mbar 1mbar keep 18min or more, determine hydrogen after vacuum breaker, and guarantee [H]≤
2ppm, vacuum breaker sample after determining hydrogen, feed aluminum steel according to aluminium component, feed aluminum steel 40m 60m, feed after stirring 2min 3min
Enter it is quiet after pure calcium pump core-spun yarn 90m stir time 15min 35min, carbon-free covering agent 120kg, bull ladle temperature is added in quiet process of stirring
1555 DEG C of upper continuous castings are poured；
Continuous casting process, casting process are poured using full guard, and ladle to tundish seals molding casting using long nozzle argon, in
Between packet to crystallizer use submersed nozzle molding casting, molten steel uses carbon-free covering agent, carbon covering slag in crystallizer in middle packet；
The process control of continuous casting process includes control intensity of cooling, mold oscillation and stirring parameter, control continuous casting billet drawing
Speed and molten steel temperature in tundish: continuous casting perseverance casting speed control 2.0m/min, continuous casting, which is opened, pours the control of the furnace tundish degree of superheat at 35 DEG C, even
Control intensity of cooling in casting casting process uses secondary cooling system, and continuous casting is divided into the process to slab sub-sectional cooling
Cooling section, secondary cooling section, a cooling section is cooling for crystallizer, and mold liquid level uses full-automatic level detection, knot
The shake journey of brilliant device is less than 5mm, and secondary cooling section is cooling using aerosol；Stirring parameter is crystallizer, casting blank solidification end institute
The parameter of the magnetic stirrer coil of use.
Embodiment 2
A kind of Weather-resistance bridge steel provided in this embodiment, chemical component and mass percent are as follows: C:0.38%, Si:0.20,
Mn:0.72%, S:0.004%, P:0.008%, Cr:1.00%, Ni:1.03%, Cu:0.35%, Mo:0.31%, V:0.25%, AL:
0.25%。
Its smelting process, specifically includes: electric furnace smelting process, refining furnace refining procedure, vacuum drying oven degassing process and continuous casting
Process is poured,
In electric furnace smelting process, it is incorporated molten iron and steel scrap, wherein molten iron accounts for the 45% of furnace charge total amount, supplies oxygen using coherent oxygen lance de-
Carbon and slag making dephosphorization, melting down ingredient are controlled by P≤0.006%, reach 1625 DEG C of tapping temperature tappings, are tapped first 2 minutes and are stopped
Oxygen supply, adding deoxygenation furnace-curing agent reduces the oxygen content of molten steel in electric furnace, and tapping is added aluminum shot alloying process early period, alloy and big
Bottom stirs to molten steel just deoxidation；
In refining furnace refining procedure, refining furnace adds sial calcium diffusive deoxidation to make white slag, deep deoxidation, desulfurization, according to sampling ingredient point
Alloy adjusting component is added in analysis, and into 1632 DEG C of true temp, ingredient enters vacuum drying oven processing after meeting steel grades requirement；
Vacuum drying oven degassing process, rough vacuum 0.5mbar 1mbar keep 18min or more, determine hydrogen after vacuum breaker, and guarantee [H]≤
2ppm, vacuum breaker sample after determining hydrogen, feed aluminum steel according to aluminium component, feed aluminum steel 40m 60m, feed after stirring 2min 3min
Enter it is quiet after pure calcium pump core-spun yarn 90m stir time 15min 35min, carbon-free covering agent 140kg, bull ladle temperature is added in quiet process of stirring
1560 DEG C of upper continuous castings are poured；
Continuous casting process, casting process are poured using full guard, and ladle to tundish seals molding casting using long nozzle argon, in
Between packet to crystallizer use submersed nozzle molding casting, molten steel uses carbon-free covering agent, carbon covering slag in crystallizer in middle packet；
The process control of continuous casting process includes control intensity of cooling, mold oscillation and stirring parameter, control continuous casting billet drawing
Speed and molten steel temperature in tundish: continuous casting perseverance casting speed control 2.0m/min, continuous casting, which is opened, pours the control of the furnace tundish degree of superheat at 38 DEG C, even
Control intensity of cooling in casting casting process uses secondary cooling system, and continuous casting is divided into the process to slab sub-sectional cooling
Cooling section, secondary cooling section, a cooling section is cooling for crystallizer, and mold liquid level uses full-automatic level detection, knot
The shake journey of brilliant device is less than 5mm, and secondary cooling section is cooling using aerosol；Stirring parameter is crystallizer, casting blank solidification end institute
The parameter of the magnetic stirrer coil of use.
Embodiment 3
A kind of Weather-resistance bridge steel provided in this embodiment, chemical component and mass percent are as follows: C:0.37%, Si:0.17%,
Mn:0.68%, S:0.003%, P:0.007%, Cr:1.02%, Ni:1.05%, Cu:0.36%, Mo:0.29%, V:0.24%, AL:
0.26%。
Its smelting process, specifically includes: electric furnace smelting process, refining furnace refining procedure, vacuum drying oven degassing process and continuous casting
Process is poured,
In electric furnace smelting process, it is incorporated molten iron and steel scrap, wherein molten iron accounts for the 50% of furnace charge total amount, supplies oxygen using coherent oxygen lance de-
Carbon and slag making dephosphorization, melting down ingredient are controlled by P≤0.006%, reach 1632 DEG C of tapping temperature tappings, are tapped first 2 minutes and are stopped
Oxygen supply, adding deoxygenation furnace-curing agent reduces the oxygen content of molten steel in electric furnace, and tapping is added aluminum shot alloying process early period, alloy and big
Bottom stirs to molten steel just deoxidation；
In refining furnace refining procedure, refining furnace adds sial calcium diffusive deoxidation to make white slag, deep deoxidation, desulfurization, according to sampling ingredient point
Alloy adjusting component is added in analysis, and into 1636 DEG C of true temp, ingredient enters vacuum drying oven processing after meeting steel grades requirement；
Vacuum drying oven degassing process, rough vacuum 0.5mbar 1mbar keep 18min or more, determine hydrogen after vacuum breaker, and guarantee [H]≤
2ppm, vacuum breaker sample after determining hydrogen, feed aluminum steel according to aluminium component, feed aluminum steel 40m 60m, feed after stirring 2min 3min
Enter it is quiet after pure calcium pump core-spun yarn 90m stir time 15min 35min, carbon-free covering agent 180kg, bull ladle temperature is added in quiet process of stirring
1558 DEG C of upper continuous castings are poured；
Continuous casting process, casting process are poured using full guard, and ladle to tundish seals molding casting using long nozzle argon, in
Between packet to crystallizer use submersed nozzle molding casting, molten steel uses carbon-free covering agent, carbon covering slag in crystallizer in middle packet；
The process control of continuous casting process includes control intensity of cooling, mold oscillation and stirring parameter, control continuous casting billet drawing
Speed and molten steel temperature in tundish: continuous casting perseverance casting speed control 2.0m/min, continuous casting, which is opened, pours the control of the furnace tundish degree of superheat at 33 DEG C, even
Control intensity of cooling in casting casting process uses secondary cooling system, and continuous casting is divided into the process to slab sub-sectional cooling
Cooling section, secondary cooling section, a cooling section is cooling for crystallizer, and mold liquid level uses full-automatic level detection, knot
The shake journey of brilliant device is less than 5mm, and secondary cooling section is cooling using aerosol；Stirring parameter is crystallizer, casting blank solidification end institute
The parameter of the magnetic stirrer coil of use.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (6)
1. a kind of Weather-resistance bridge steel, which is characterized in that its chemical component and mass percent are as follows: C:0.36% 0.39%, Si:
0.10% 0.25%, Mn:0.65% 0.75%, S≤0.005%, P≤0.010%, Cr:0.95% 1.05%, Ni:1.00%
1.10%, Cu:0.30% 0.40%, Mo:0.27% 0.35%, V:0.20% 0.30%, A1:0.015% 0.035%.
2. a kind of Weather-resistance bridge steel according to claim 1, which is characterized in that its chemical component and mass percent are such as
Under: C:0.38%, Si:0.18%, Mn:0.70%, S:0.003%, P:0.009%, Cr:0.98%, Ni:1.02%, Cu:0.32%, Mo:
0.30%, V:0.23%, AL:0.20%.
3. a kind of Weather-resistance bridge steel according to claim 1, which is characterized in that its chemical component and mass percent are such as
Under: C:0.38%, Si:0.20, Mn:0.72%, S:0.004%, P:0.008%, Cr:1.00%, Ni:1.03%, Cu:0.35%, Mo:
0.31%, V:0.25%, AL:0.25%.
4. a kind of Weather-resistance bridge steel according to claim 1, which is characterized in that its chemical component and mass percent are such as
Under: C:0.37%, Si:0.17%, Mn:0.68%, S:0.003%, P:0.007%, Cr:1.02%, Ni:1.05%, Cu:0.36%, Mo:
0.29%, V:0.24%, AL:0.26%.
5. a kind of Weather-resistance bridge steel smelting technique, which is characterized in that specifically include: electric furnace smelting process, refining furnace refining procedure,
Vacuum drying oven degassing process and continuous casting process,
In electric furnace smelting process, it is incorporated molten iron and steel scrap, wherein molten iron accounts for 40% the 60% of furnace charge total amount, supplies using coherent oxygen lance
Oxygen decarburization and slag making dephosphorization, melting down ingredient are controlled by P≤0. 006%, reach 1610 DEG C of 1680 DEG C of tappings of tapping temperature, out
2 minutes oxygen feeding stops before steel, adding deoxygenation furnace-curing agent reduces the oxygen content of molten steel in electric furnace, and tapping is added alloying process early period
Aluminum shot, alloy and outsole stir to molten steel just deoxidation；
In refining furnace refining procedure, refining furnace adds sial calcium diffusive deoxidation to make white slag, deep deoxidation, desulfurization, according to sampling ingredient point
Alloy adjusting component is added in analysis, and into 1630 DEG C 1640 DEG C of true temp, ingredient enters vacuum drying oven after meeting steel grades requirement
Processing；
Vacuum drying oven degassing process, rough vacuum 0.5mbar 1mbar keep 18min or more, determine hydrogen after vacuum breaker, and guarantee [H]≤
2ppm, vacuum breaker sample after determining hydrogen, feed aluminum steel according to aluminium component, feed aluminum steel 40m 60m, feed after stirring 2min 3min
Enter it is quiet after pure calcium pump core-spun yarn 80m 100m stir time 15min 35min, carbon-free covering agent 100kg is added in quiet process of stirring
200kg, 1550 DEG C 1570 DEG C of bull ladle temperature upper continuous castings are poured；
Continuous casting process, casting process are poured using full guard, and ladle to tundish seals molding casting using long nozzle argon, in
Between packet to crystallizer use submersed nozzle molding casting, molten steel uses carbon-free covering agent, carbon covering slag in crystallizer in middle packet；
The process control of continuous casting process includes control intensity of cooling, mold oscillation and stirring parameter, control continuous casting billet drawing
Speed and molten steel temperature in tundish.
6. a kind of Weather-resistance bridge steel according to claim 1, it is characterised in that: the continuous casting process, continuous casting perseverance are drawn
Speed control 2.0m/min, continuous casting open that pour control of the furnace tundish degree of superheat control in 25 DEG C 40 DEG C, continuous casting process cold
But intensity uses secondary cooling system, and continuous casting is divided into cooling section, a secondary cooling in the process to slab sub-sectional cooling
Section, a cooling section are that crystallizer is cooling, and mold liquid level uses full-automatic level detection, and the shake journey of crystallizer is less than 5mm, two
Secondary cooling section is cooling using aerosol；Stirring parameter is magnetic stirrer used by crystallizer, casting blank solidification end
The parameter of coil.
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| CN201811323097.4A CN109252012A (en) | 2018-11-08 | 2018-11-08 | A kind of Weather-resistance bridge steel and smelting process |
| PCT/CN2019/089350 WO2020093688A1 (en) | 2018-11-08 | 2019-05-30 | Weather-resistant bridge steel and smelting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020093688A1 (en) * | 2018-11-08 | 2020-05-14 | 南京钢铁股份有限公司 | Weather-resistant bridge steel and smelting process |
| CN111519081A (en) * | 2020-04-17 | 2020-08-11 | 南京钢铁股份有限公司 | Production method of low-sulfur peritectic steel continuous casting round billet |
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- 2018-11-08 CN CN201811323097.4A patent/CN109252012A/en active Pending
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| DE2144325A1 (en) * | 1971-09-03 | 1973-03-15 | Mim Comb Siderurg Galati | Weather resistant constructional steel - is fine grained, weldable and brittle fracture resistant |
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| WO2020093688A1 (en) * | 2018-11-08 | 2020-05-14 | 南京钢铁股份有限公司 | Weather-resistant bridge steel and smelting process |
| CN111519081A (en) * | 2020-04-17 | 2020-08-11 | 南京钢铁股份有限公司 | Production method of low-sulfur peritectic steel continuous casting round billet |
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