CN107955919A - Steel bar and its LF stove production methods are built containing V, Nb microalloy - Google Patents
Steel bar and its LF stove production methods are built containing V, Nb microalloy 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- 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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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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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
- C22C38/001—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
- C22C38/02—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
- 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
- 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
- C21D2211/005—Ferrite
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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
- C21D2211/009—Pearlite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb microalloy building steel bar and its LF stove production methods.The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, the present invention provides one kind containing V, Nb microalloy building steel bar and its LF stove production methods.The constituent of the bar is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N:0.0060%~0.0180%, P≤0.040%, S≤0.040%, V:0.010%~0.100%, Nb:0.010%~0.030%, surplus is Fe and inevitable impurity.The key of its preparation method feeds core-spun yarn containing N, adjustment N to suitable level after being the refining of LF stoves.The method of the present invention is easy to operate, and nitrogen recovery rate is high and stablizes, moreover it is possible to effectively reduces production cost, is worth of widely use.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb microalloy building steel bar and its production of LF stoves
Method.
Background technology
Micro alloyed steel is primarily referred to as adding certain either micro element of minimal amount in steel with regard to that can significantly improve performance
Steel, particularly improve steel intensity index.It is either micro- mainly usually to add minimal amount for micro alloyed steel under the conditions of the prior art
Measure vanadium, niobium and titanium and obtain.The mechanism of action of microalloying is：After vanadium, niobium and titanium as trace element add molten steel, with steel
Carbon and nitrogen in liquid combine, and form carbon, nitrogen compound particle, i.e. V (C, N), Nb (C, N) and Ti (C, N) particle, these particles
There is certain precipitation strength and crystal grain refinement, can significantly improve the intensity of steel.
It will thus be seen that the effect of actually micro alloyed steel vanadium, niobium and titanium is inseparable with nitrogen, but under normal circumstances
Using converter smelting steel, residual nitrogen content is in the range of 0.0030%~0.065%, using electric furnace smelting steel, residual nitrogen content
In the range of 0.050%~0.085%, in most cases.The effect of vanadium, niobium and titanium is such as given full play to, is to have to volume
It is outer to add what nitrogen be realized.
Early stage increases nitrogen in micro alloyed steel, is realized by the nitridation class alloy of addition 3%~6%, but due to
It is nitrogenous very low to nitrogenize class alloy, causes alloy addition big, and recovery rate is unstable, is gradually closed by the higher vanadium nitride of nitrogen content
Jin Dynasty is replaced.At present almost it is difficult to reuse 3%~6% nitridation class alloy in the production of micro alloyed steel, almost all use is
Containing vanadium and nitrogen content and high alloy of vanadium nitride.Alloy of vanadium nitride mainly has tri- trades mark of VN12, VN14 and VN16.General feelings
The ratio of three trade mark nitrogen and vanadium is substantially stationary under condition, is respectively 12：78(N:V)；14：78(N:V)；16：78(N:
V), i.e. the ratio of nitrogen and vanadium is up to the 16 of VN16：78, i.e., containing 16% N in alloy, contain 78% vanadium.Alloy of vanadium nitride
Although not only again high containing vanadium and nitrogen content, for micro-alloying technology route different in micro alloyed steel, compound micro- conjunction is particularly
Jin Gang, such as V-Ti-N, even V-Ti-Nb-N, and it is unable to meet demand.
The content of the invention
The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, and the present invention carries
A kind of new method for preparing nitrogen-containing alloy is supplied.This method accurately controls nitrogen content by the way of nitrogenous core-spun yarn is added,
Nitrogen recovery rate is high.
The present invention solve above-mentioned technical problem technical solution be：There is provided it is a kind of containing V, Nb microalloy building steel bar and its
LF stove production methods.
The present invention provides a kind of V, Nb microalloy that contains and builds steel bar, its chemical composition is：By weight percentage, C：
0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N:0.0060%~0.0180%, P≤
0.040%th, S≤0.040%, V:0.010%~0.100%, Nb:0.010%~0.030%, surplus is for Fe and unavoidably
Impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, including following step
Suddenly：
It is blast-melted that steel billet is made through converter smelting, LF refining, continuous casting；Steel billet is heated, the production of continous way rolling bar
Line rolling becomes a useful person, cools down pole or Ribbed Bar is made；Core-spun yarn adjustment N, steel billet are wherein fed after the refining of LF stoves in ladle
Heating and temperature control be 950~1220 DEG C, soaking temperature control be 1000~1200 DEG C, heating and soaking total time 90~
120min；The steel billet component is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：
0.60%~1.30%, N:0.0060%~0.0180%, P≤0.040%, S≤0.040%, V:0.010%~0.100%,
Nb:0.010%~0.030%, surplus is Fe and inevitable impurity.
Further, the LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, comprise the following steps：
A, converter smelting
Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat molten steel C content for 0.05%~
0.15%, P content≤0.025%, S content≤0.035%, when liquid steel temperature >=1650 DEG C, tap；
Tap 1/3-2/3 when, add FeSi, FeMn, FeNb alloy and carburant, FeV or VN, control C be 0.15%~
0.30%th, Si is that 0.30%~1.00%, Mn is 0.60%~1.30%, and V content is 0.010%~0.100%, Nb is
0.010%~0.030%；
B, core-spun yarn is fed
It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；Steel ladle reaches LF
Be electrically heated after stove, core-spun yarn fed in ladle after the refining of LF stoves, control in molten steel N content be 0.0060%~
0.0180%；
C, continuous casting
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the steel billet section that molten steel is casting continuously to form is 150mm × 150mm
The square billet of~200mm × 200mm, is air-cooled to room temperature；
D, heating steel billet and rolling
Billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, and heating and soaking are total
Time is 90~120min, and pole or Ribbed Bar are rolled into using continous way rolling bar production line.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, molten iron described in step a requires S
Content≤0.060%.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, FeSi and FeMn described in step a
Alloy FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, the inert gas described in step b
For one kind in argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, indifferent gas is blown into described in step b
The time of body >=2min.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, step b electrical heating temperatures are higher than liquid
60~90 DEG C of liquidus temperature.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Nb microalloy, pole or with ribbing described in step d
The specification of reinforcing bar is
Beneficial effects of the present invention are：
The present invention builds steel bar by designing a kind of microalloy containing V, Nb, and alloying component V is added in steel:
0.010%~0.100% and Nb:0.010%~0.030%, then coordinate using the side that the core-spun yarn containing N is fed after converter smelting
Formula is adjusted steel grade N content, is rolled using rolling bar production line, and it is high that a kind of intensity height, nitrogen recovery rate can finally be prepared
Microalloy builds steel bar.The method of the present invention is easy to operate, and nitrogen recovery rate is high and stablizes, moreover it is possible to production cost is effectively reduced,
It is worth of widely use.
Embodiment
It is containing V, Nb microalloy building steel bar, its chemical composition the present invention provides one kind：By weight percentage, C：
0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N:0.0060%~0.0180%, P≤
0.040%th, S≤0.040%, V:0.010%~0.100%, Nb:0.010%~0.030%, surplus is for Fe and unavoidably
Impurity.
When V, 0.010%~0.030% Nb that the present invention adds 0.010%~0.100% are to ensure steel
Imitate performance.When using converter smelting steel under normal circumstances, residual nitrogen content in final finished steel 0.0030%~
In the range of 0.0065%, using electric furnace smelting steel, residual nitrogen content is then in the range of 0.0050%~0.0085%.With in steel
N content raises, and timeliness is deteriorated therewith, of the invention then the V of use addition 0.010%~0.100%, 0.010%~0.030%
Nb modes, to ensure the timeliness of steel, while the solution strengthening effect of nitrogen can also be given full play to, so as to improve the strong of steel
Degree, reduces the cost of alloy of steel.
In addition, in above-mentioned chemical composition, because the nitrogen content in molten steel is higher than residual nitrogen content in usual steel, the addition of titanium
It is more prone to form V (C, N) particle, Nb (C, N) particle, so as to promote the precipitation of V, Nb, can more fully plays vanadium
,, can on the premise of equal mechanical property to improve the comprehensive mechanical property of steel with the precipitation strength and Grain Refinement Effect of niobium
Reduce the usage amount of vanadium and niobium.
Present invention also offers a kind of LF stove production methods of the building steel bar containing V, Nb microalloy, comprise the following steps：
A, converter smelting
Molten iron and steel scrap are added first in converter, it is desirable to which the molten iron S contents of addition are not more than 0.060%.Molten iron and useless
After steel adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.05%~0.15% C, P is no more than 0.025%, S is not more than 0.035%, and when tapping temperature is not less than 1650 DEG C taps
Into ladle；
The FeSi alloys containing Si elements, the FeMn alloys containing Mn elements, the conjunction containing V element are added in tapping process
Gold, the alloy containing Nb elements, and carbon dust or anthracite etc. increase C, and control C is in the range of 0.15%~0.30%, control Si
In the range of 0.30%~1.00%, Mn is in the range of 0.60%~1.30% for control, and V is in 0.010%~0.100% model for control
In enclosing, Nb is in the range of 0.010%~0.050% for control；Tap 1/3 when be initially added into FeSi, FeMn and FeNb, FeV or
Person's VN alloys, tapping to when 2/3 to add；
In the addition of above-mentioned alloy, also FeSi and FeMn alloys can be replaced using the FeSiMn alloys containing Si and Mn；
B, inert gas is blown into after Converter
After the completion of tapping, after ladle arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown
Enter inert gas, the inert gas being blown into can be argon gas or nitrogen, be blown into the time of inert gas and should be not less than
2min.The blowing time of regulation inert gas is to ensure that molten steel has enough circulation time not less than 2min, can make to add
All kinds of alloys entered fully melt and uniformly；
C, LF stove heats
After steel ladle reaches LF stoves, it is electrically heated, electrical heating temperature control range is higher than liquidus temperature 60~90
DEG C, after reaching requirement temperature, sampling carries out N content in molten steel and detects, and bag containing N is added using the method for line feeding according to testing result
Cored wire, the core-spun yarn containing N be mainly alloy containing N, such as SiN, control molten steel in N content in 0.0060%~0.0180% model
In enclosing, if N content control is relatively stable in molten steel after LF stove heats, it can not sample and carry out N content detection, be fed directly into cored
Line；
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into ability after inert gas
The core-spun yarn containing N is fed, inert gas can be argon gas or nitrogen, when being blown into inert gas after the completion of line feeding
Between also need extend 2min, to ensure the uniformity of N element in molten steel；
D, it is casting continuously to form steel billet
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, which is realized by above-mentioned LF stoves electrical heating；
The steel billet section that molten steel is casting continuously to form is the square billet of 150mm × 150mm~200mm × 200mm, the square billet less than 150mm × 150mm
Section is small to be unfavorable for working continuously for bof process, and the square billet section more than 200mm × 200mm can then extend follow-up rolling steel billet
When heating time；The steel billet that molten steel is casting continuously to form naturally cools to room temperature in atmosphere.
E, heating steel billet and rolling
Heating requirements total heating time of steel billet is 90~120min, and heating and temperature control is 950~1220 DEG C, soaking temperature
Degree control is in the range of 1000~1200 DEG C, is rolled into using continous way rolling bar production linePole
Or Ribbed Bar.
Explanation will be further explained to the embodiment of the present invention by embodiment below, but do not indicated that this
The protection domain of invention is limited in described in embodiment in scope.
Embodiment 1 is prepared containing V, Nb microalloy building steel bar with the method for the present invention
Certain steel plant is on 120 tons of (actual tap is in the range of 120~140 tons) bof processes of nominal capacity using this
Inventive technique produces band for building and strangles reinforcing bar, production technology be blown into after converter smelting → stove inert gas → LF stoves electrical heating →
6 machines 6 stream billet caster is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoBand strangles reinforcing bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1660~1680 DEG C, actual tapping at this time
Measure as 133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn,
FeV, FeNb alloy and anthracite carry out Si, Mn, V, Nb and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that V content is that Nb contents are 65% in 78%, FeNb alloys in 82%, FeV alloys in 74%, FeMn alloy, smokelessly
C is fixed in coal as 92%, control in molten steel Si contents be Si contents be 0.31%, Mn contents are 0.61%, V content is
0.010%th, Nb contents be 0.010%, C content 0.16%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 5min, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1579 DEG C
Cored wire, it is 0.0062% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent to conticaster to cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1550 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.32%
Si, 0.63% Mn, 0.03% Cr, 0.011% V, 0.010% Nb, 0.032% P, 0.018% S,
0.0064% N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to continous way production line of bar and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1213 DEG C, and soaking temperature is 1166 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 955 DEG C, and natural air cooling is carried out after upper cold bed, is finally collected, bundling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 362MPa, tensile strength 475MPa, elongation are
35.6%th, maximum, force percentage of total elongation is 16.2%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Embodiment 2 is prepared containing V, Nb microalloy building steel bar with the method for the present invention
Certain steel plant is on 120 tons of (actual tap is in the range of 120~140 tons) bof processes of nominal capacity using this
Inventive technique produces band for building and strangles reinforcing bar, production technology be blown into after converter smelting → stove inert gas → LF stoves electrical heating →
6 machines 6 stream billet caster is cast into 200mm × 200mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoBand strangles reinforcing bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1660~1680 DEG C, actual tapping at this time
Measure as 133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn,
FeV alloys, FeNb and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that the content that V content is Nb in 78%, FeNb alloys in 82%, FeV alloys is 65% in 74%, FeMn alloy, nothing
C is fixed in bituminous coal as 92%, controls in molten steel that Si contents are 0.96%, Mn contents are 1.28%, V content 0.097%, Nb contain
Measure as 0.030%, C content 0.29%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 5min, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1581 DEG C
Cored wire, it is 0.0170% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent to conticaster to cast.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1537 DEG C during continuous casting,
The liquidus temperature of steel is 1495 DEG C, bag sampling analysis molten steel chemical constituent is 0.30% in conticaster C, 0.97%
Si, 1.28% Mn, 0.30% Cr, 0.098% V, 0.029% Nb, 0.035% P, 0.029% S,
0.0176% N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to continous way production line of bar and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1025 DEG C, and soaking temperature is 1009 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 890 DEG C, and natural air cooling is carried out after upper cold bed, is finally collected, bundling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 556MPa, tensile strength 725MPa, elongation are
20.2%th, maximum, force percentage of total elongation is 11.4%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Embodiment 3 is prepared containing V, Nb microalloy building steel bar with the method for the present invention
Certain steel plant is on 120 tons of (actual tap is in the range of 120~140 tons) bof processes of nominal capacity using this
Inventive technique produces band for building and strangles reinforcing bar, production technology be blown into after converter smelting → stove inert gas → LF stoves electrical heating →
6 machines 6 stream billet caster is cast into 200mm × 200mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoBand strangles reinforcing bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1660~1680 DEG C, actual tapping at this time
Measure as 133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn,
FeV, FeNb alloy and anthracite carry out Si, Mn, V, Nb and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that V content is that Nb contents are 65% in 78%, FeNb alloys in 82%, FeV alloys in 74%, FeMn alloy, smokelessly
C is fixed in coal as 92%, control in molten steel Si contents be Si contents be 0.65%, Mn contents are 0.96%, V content is
0.051%th, Nb contents be 0.021%, C content 0.22%.After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipe
Road, the molten steel into ladle are blown into nitrogen, are blown into 4~5min of nitrogen, all kinds of alloys of addition is fully melted and uniformly.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 5min, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1576 DEG C
Cored wire, it is 0.0113% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent to conticaster to cast.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1534 DEG C during continuous casting,
The liquidus temperature of steel is 1510 DEG C, and C, Si content that bag sampling analysis molten steel chemical constituent is 0.22% in conticaster are
0.64%th, Mn contents are 0.98%, Cr contents are 0.32%, V content 0.054%, Nb contents are 0.022%, 0.032%
P, 0.027% S, 0.0116% N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to continous way production line of bar and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1132 DEG C, and soaking temperature is 1108 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 907 DEG C, and natural air cooling is carried out after upper cold bed, is finally collected, bundling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 473MPa, tensile strength 617MPa, elongation are
25.6%th, maximum, force percentage of total elongation is 12.6%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Claims (9)
1. containing V, Nb microalloy building steel bar, it is characterised in that chemical composition is：By weight percentage, C：0.15%~
0.30%th, Si：0.30%~1.00%, Mn：0.60%~1.30%, N:0.0060%~0.0180%, P≤0.040%, S
≤ 0.040%, V:0.010%~0.100%, Nb:0.010%~0.030%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building steel bar containing V, Nb microalloy described in claim 1, it is characterised in that including following
Step：
It is blast-melted that steel billet is made through converter smelting, LF refining, continuous casting；Steel billet is heated, continous way rolling bar production line rolls
Material is made, pole or Ribbed Bar is made in cooling；Core-spun yarn adjustment N, heating steel billet are wherein fed after the refining of LF stoves in ladle
Temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；
The steel billet component is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~
1.30%th, N:0.0060%~0.0180%, P≤0.040%, S≤0.040%, V:0.010%~0.100%, Nb:
0.010%~0.030%, surplus is Fe and inevitable impurity.
3. the LF stove production methods of the building steel bar according to claim 2 containing V, Nb microalloy, it is characterised in that including
Following steps：
A, converter smelting
Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat molten steel C content for 0.05%~
0.15%, P content≤0.025%, S content≤0.035%, when liquid steel temperature >=1650 DEG C, tap；
Tap 1/3-2/3 when, add FeSi, FeMn, FeNb alloy and carburant, FeV or VN, control C be 0.15%~
0.30%th, Si is that 0.30%~1.00%, Mn is 0.60%~1.30%, and V content is 0.010%~0.100%, Nb is
0.010%~0.030%；
B, core-spun yarn is fed
It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；After steel ladle reaches LF stoves
It is electrically heated, core-spun yarn is fed in ladle after the refining of LF stoves, it is 0.0060%~0.0180% to control N content in molten steel；
C, continuous casting
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, the steel billet section that molten steel is casting continuously to form for 150mm × 150mm~
The square billet of 200mm × 200mm, is air-cooled to room temperature；
D, heating steel billet and rolling
Billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and soaking total time
For 90~120min, pole or Ribbed Bar are rolled into using continous way rolling bar production line.
4. the LF stove production methods of the building steel bar according to claim 3 containing V, Nb microalloy, it is characterised in that：Step
Molten iron described in a requires S content≤0.060%.
5. the LF stove production methods of the building steel bar according to claim 3 containing V, Nb microalloy, it is characterised in that：Step
The FeSiMn alloy replacings of FeSi and FeMn alloys described in a.
6. the LF stove production methods of the building steel bar according to claim 3 containing V, Nb microalloy, it is characterised in that：Step
Inert gas described in b is one kind in argon gas or nitrogen.
7. the LF stove production methods of the building steel bar according to claim 3 containing V, Nb microalloy, it is characterised in that：Step
Time >=2min of inert gas is blown into described in b.
8. the LF stove production methods of the building steel bar according to claim 3 containing V, Nb microalloy, it is characterised in that：Step
B electrical heating temperatures are higher than 60~90 DEG C of liquidus temperature.
9. the LF stove production methods of the building steel bar according to claim 3 containing V, Nb microalloy, it is characterised in that：Step
The specification of pole described in d or Ribbed Bar is
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252106A (en) * | 2018-11-23 | 2019-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar bar and its production method |
| CN110819891A (en) * | 2019-10-14 | 2020-02-21 | 长沙东鑫环保材料有限责任公司 | Niobium-nitrogen-containing microalloyed HRB500E steel bar and production method thereof |
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111519100A (en) * | 2020-01-11 | 2020-08-11 | 武钢集团昆明钢铁股份有限公司 | Niobium-vanadium microalloyed 400 MPa-grade ultrafine-grain high-toughness anti-seismic reinforcing steel bar and preparation method thereof |
| CN114657346A (en) * | 2022-03-23 | 2022-06-24 | 安阳钢铁股份有限公司 | VN microalloyed steel for coal mine hydraulic support and preparation method thereof |
| CN116790979A (en) * | 2023-06-14 | 2023-09-22 | 重庆钢铁股份有限公司 | HRB500E ribbed double high rod and production method thereof |
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| CN107955906A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel bar and its production method are built containing V, Nb microalloy |
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| CN104018075A (en) * | 2014-06-25 | 2014-09-03 | 武汉钢铁(集团)公司 | Hot rolled ribbed steel bar with yield-to-tensile ratio of less than or equal to 0.8 and Rel of more than or equal to 600MPa, and production method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252106A (en) * | 2018-11-23 | 2019-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar bar and its production method |
| CN110819891A (en) * | 2019-10-14 | 2020-02-21 | 长沙东鑫环保材料有限责任公司 | Niobium-nitrogen-containing microalloyed HRB500E steel bar and production method thereof |
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111519100A (en) * | 2020-01-11 | 2020-08-11 | 武钢集团昆明钢铁股份有限公司 | Niobium-vanadium microalloyed 400 MPa-grade ultrafine-grain high-toughness anti-seismic reinforcing steel bar and preparation method thereof |
| CN114657346A (en) * | 2022-03-23 | 2022-06-24 | 安阳钢铁股份有限公司 | VN microalloyed steel for coal mine hydraulic support and preparation method thereof |
| CN116790979A (en) * | 2023-06-14 | 2023-09-22 | 重庆钢铁股份有限公司 | HRB500E ribbed double high rod and production method thereof |
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