CN107955905A - Microalloy containing V builds steel bar and its LF stove production methods - Google Patents
Microalloy containing V builds steel bar and its LF stove production methods Download PDFInfo
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- CN107955905A CN107955905A CN201711242259.7A CN201711242259A CN107955905A CN 107955905 A CN107955905 A CN 107955905A CN 201711242259 A CN201711242259 A CN 201711242259A CN 107955905 A CN107955905 A CN 107955905A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to field of steel metallurgy, and in particular to a kind of the building steel bar of microalloy containing V 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, and the present invention provides a kind of building steel bar of microalloy containing V 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%~0.160%, surplus is Fe and inevitable impurity.The crucial of its preparation method feeds core-spun yarn, adjustment N to suitable level after the refining of LF stoves in ladle.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 a kind of building steel bar of microalloy containing V and its LF stove producers
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：A kind of building steel bar of microalloy containing V and its LF are provided
Stove production method.
The present invention provides a kind of building of microalloy containing V 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%~0.160%, surplus is Fe and inevitable impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building of microalloy containing V steel bar, comprise the following steps：
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%~0.160%,
Surplus is Fe and inevitable impurity.
Further, the LF stove production methods of the above-mentioned building of microalloy containing V steel bar, 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；
During tapping 1/3-2/3, FeSi, FeMn and carburant, FeV or VN are added, controls C as 0.15%~0.30%, Si
It is that 0.60%~1.30%, V is 0.010%~0.160% for 0.30%~1.00%, Mn；
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
90~120min of time, 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 of microalloy containing V steel bar, molten iron described in step a requires S contents
≤ 0.060%.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel bar, FeSi described in step a and FeMn are closed
Gold uses FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel bar, the inert gas described in step b is
One kind in argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel bar, inert gas is blown into described in step b
Time >=2min.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel bar, step b electrical heating temperatures are higher than liquid phase
60~90 DEG C of line temperature.
Wherein, in the LF stove production methods of above-mentioned microalloy containing V building steel bar, pole described in step d or with rib steel
The specification of muscle is
Beneficial effects of the present invention are：
The present invention builds steel bar by designing a kind of microalloy containing V, and alloying component V is added in steel:0.010%~
0.160%, then coordinate and adjust steel grade N content by the way of core-spun yarn containing N is fed after converter smelting, given birth to using rolling bar
Producing line rolls, and the microalloy building steel bar that a kind of intensity is high, nitrogen recovery rate is high can finally be prepared.The method of the present invention operates
Simply, nitrogen recovery rate is high and stablizes, moreover it is possible to effectively reduces production cost, is worth of widely use.
Embodiment
The present invention provides a kind of building of microalloy containing V steel bar, its chemical composition is：By weight percentage, C：
0.15%~0.30%, Si：0.30%~1.0%, Mn：0.60%~1.30%, N:0.0060%~0.0180%, P≤
0.040%th, S≤0.040%, V:0.010%~0.160%, surplus is Fe and inevitable impurity.
The V that the present invention adds 0.010%~0.160% is to ensure the aging performance of steel.Use under normal circumstances
During converter smelting steel, the residual nitrogen content in final finished steel is in the range of 0.0030%~0.0065%, using electric furnace smelting
Steel, residual nitrogen content is then in the range of 0.0050%~0.0085%.As N content raises in steel, timeliness is deteriorated therewith, this
Invention then by the way of 0.010%~0.160% V is added, to ensure the timeliness of steel, while can also give full play to nitrogen
Solution strengthening effect, so as to improve the intensity of steel, reduce 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, so as to promote the precipitation of V, can more fully plays the precipitation strength and crystal grain of vanadium
Refining effect, to improve the comprehensive mechanical property of steel, on the premise of equal mechanical property, can reduce the usage amount of vanadium.
Present invention also offers a kind of LF stove production methods of microalloy containing V building steel bar, 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 are added in tapping process, and contains V element
Alloy and carburant, the carburant is C powder or anthracite, and control C is in the range of 0.15%~0.30%, control Si exists
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%~0.160% scope for control
It is interior；FeSi, FeMn and FeV or VN alloys are initially added into tapping 1/3, 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 lineCircle
Rod 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 prepares the building steel bar of microalloy containing V 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 Ribbed Bar for building, and production technology is to be blown into inert gas+feeding core-spun yarn → 6 after converter smelting → stove
The stream billet caster of machine 6 is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoRibbed 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 0.052%.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
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1679 DEG C, and actual tap is at this time
136 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that V content is 78% in 82%, FeV alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.31%th, Mn contents be 0.60%, V content 0.010%, C content 0.15%..
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 4min, 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 1575 DEG C
Cored wire, it is 0.0060% to control N content in molten steel.Before feeding core-spun yarn, steel ladle connects the pipeline for being blown into inert gas again,
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 will
Molten steel is sent to conticaster and casts.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1546 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, 0.31%
Si, 0.61% Mn, 0.10% Cr, 0.011% V, 0.038% P, 0.029% 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 1214 DEG C, and soaking temperature is 1181 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 364MPa, tensile strength 479MPa, elongation are
37.0%th, maximum, force percentage of total elongation is 16.7%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Embodiment 2 prepares the building steel bar of microalloy containing V 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 Ribbed Bar for building, and production technology is to be blown into inert gas+feeding core-spun yarn → 6 after converter smelting → stove
The stream billet caster of machine 6 is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoRibbed 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 0.052%.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
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1681 DEG C, and actual tap is at this time
131 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that V content is 78% in 82%, FeV alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.96%th, Mn contents be 1.28%, V content 0.157%, 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 1577 DEG C
Cored wire, it is 0.0162% to control N content in molten steel.Before feeding core-spun yarn, steel ladle connects the pipeline for being blown into inert gas again,
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 will
Molten steel is sent to conticaster and casts.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1535 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, 0.98%
Si, 1.29% Mn, 0.03% Cr, 0.156% V, 0.034% P, 0.022% S, 0.0162% 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 1036 DEG C, and soaking temperature is 1011 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 884 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 536MPa, tensile strength 702MPa, elongation are
17.3%th, maximum, force percentage of total elongation is 12.3%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Embodiment 3 prepares the building steel bar of microalloy containing V 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 Ribbed Bar for building, and production technology is to be blown into inert gas+feeding core-spun yarn → 6 after converter smelting → stove
The stream billet caster of machine 6 is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoRibbed 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 0.055%.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
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1680 DEG C, and actual tap is at this time
134 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that V content is 78% in 82%, FeV alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.65%th, Mn contents be 0.97%, V content 0.080%, C content 0.20%.
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 4min, 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 1583 DEG C
Cored wire, it is 0.0110% to control N content in molten steel.
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen, when line feeding is completed
Extend afterwards and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Molten steel then is sent to conticaster to be poured
Casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1541 DEG C during continuous casting,
The liquidus temperature of steel is 1510 DEG C, bag sampling analysis molten steel chemical constituent is 0.20% in conticaster C, 0.68%
Si, 0.98% Mn, 0.03% Cr, 0.081% V, 0.033% P, 0.026% S, 0.0130% 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 1130 DEG C, and soaking temperature is 1111 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 908 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 432MPa, tensile strength 582MPa, elongation are
23.0%th, maximum, force percentage of total elongation is 15.5%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Claims (9)
1. microalloy containing V builds 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%~0.160%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building steel bar of microalloy containing V described in claim 1, it is characterised in that including following step
Suddenly：
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%~0.160%, surplus Fe
With inevitable impurity.
3. the LF stove production methods of microalloy containing V according to claim 2 building steel bar, it is characterised in that including with
Lower step：
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 and carburant, FeV or VN, to control C be 0.15%~0.30%, Si is
0.30%~1.00%, Mn are that 0.60%~1.30%, V is 0.010%~0.160%；
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 of microalloy containing V steel bar according to claim 3, it is characterised in that：In step a
The molten iron requires S content≤0.060%.
5. the LF stove production methods of the building of microalloy containing V steel bar according to claim 3, it is characterised in that：In step a
FeSi the and FeMn alloys FeSiMn alloy replacings.
6. the LF stove production methods of the building of microalloy containing V steel bar according to claim 3, it is characterised in that：In step b
The inert gas is one kind in argon gas or nitrogen.
7. the LF stove production methods of the building of microalloy containing V steel bar according to claim 3, it is characterised in that：In step b
Time >=the 2min for being blown into inert gas.
8. the LF stove production methods of the building of microalloy containing V steel bar according to claim 3, it is characterised in that：Step b electricity
Heating-up temperature is higher than 60~90 DEG C of liquidus temperature.
9. the LF stove production methods of the building of microalloy containing V steel bar according to claim 3, it is characterised in that：In step d
The specification of the pole or Ribbed Bar is
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109338248A (en) * | 2018-10-24 | 2019-02-15 | 河钢股份有限公司承德分公司 | A kind of Australia mark 300E reinforcing bar and its production method |
| CN109852873A (en) * | 2019-04-09 | 2019-06-07 | 攀钢集团攀枝花钢铁研究院有限公司 | The composite brake beam steel of railway freight-car containing V and its manufacturing method with corrosion resisting property |
| CN110373610A (en) * | 2019-08-23 | 2019-10-25 | 福建三宝钢铁有限公司 | A kind of fine grain reinforcing bar preparation method producing HRB400E |
| CN113957324A (en) * | 2021-09-02 | 2022-01-21 | 包头钢铁（集团）有限责任公司 | Smelting and rolling production method of 700 MPa-level pearlite ferrite ultrahigh-strength construction steel bar |
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| CN202968665U (en) * | 2012-11-29 | 2013-06-05 | 湖北上大模具材料科技有限公司 | Core-spun yarn for nitrogen alloying |
| CN105908091A (en) * | 2016-04-29 | 2016-08-31 | 河北钢铁股份有限公司承德分公司 | Hot rolled reinforced bar for high-impact-toughness 500-MPa anchor rod and production method |
| CN107974619A (en) * | 2017-11-30 | 2018-05-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing V builds steel bar and its production method |
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| CN202968665U (en) * | 2012-11-29 | 2013-06-05 | 湖北上大模具材料科技有限公司 | Core-spun yarn for nitrogen alloying |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109338248A (en) * | 2018-10-24 | 2019-02-15 | 河钢股份有限公司承德分公司 | A kind of Australia mark 300E reinforcing bar and its production method |
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| CN110373610A (en) * | 2019-08-23 | 2019-10-25 | 福建三宝钢铁有限公司 | A kind of fine grain reinforcing bar preparation method producing HRB400E |
| CN113957324A (en) * | 2021-09-02 | 2022-01-21 | 包头钢铁（集团）有限责任公司 | Smelting and rolling production method of 700 MPa-level pearlite ferrite ultrahigh-strength construction steel bar |
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