CN107955904A - Steel bar and its production method are built containing V, Nb, Ti microalloy - Google Patents
Steel bar and its production method are built containing V, Nb, Ti microalloy Download PDFInfo
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- CN107955904A CN107955904A CN201711240001.3A CN201711240001A CN107955904A CN 107955904 A CN107955904 A CN 107955904A CN 201711240001 A CN201711240001 A CN 201711240001A CN 107955904 A CN107955904 A CN 107955904A
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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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb, Ti microalloy building steel bar and its production method.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, Ti microalloy building steel bar and its production method.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%~0.080%, Nb:0.010%~0.030%, Ti:0.010%~0.030%, surplus is Fe and inevitable impurity.The key of its preparation method is that after stove chain-wales feed core-spun yarn containing N, adjustment N to suitable level.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, Ti microalloy building steel bar and its production
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 a kind of containing V, Nb, Ti microalloy building steel bar
And its production method.
The present invention provides a kind of V, Nb, Ti 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%~0.080%, Nb:0.010%~0.030%, Ti:0.010%~
0.030%, surplus is Fe and inevitable impurity.
Present invention also offers a kind of production method of the above-mentioned building steel bar containing V, Nb, Ti microalloy, including following step
Suddenly：
It is blast-melted that steel billet is made through converter smelting, continuous casting；Steel billet is heated, continous way rolling bar production line is rolled into
Pole or Ribbed Bar is made in material, cooling；Core-spun yarn adjustment N, heating steel billet temperature are fed in the ladle of chain-wales wherein after stove
Degree control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；Institute
Stating 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%~0.080%, Nb:
0.010%~0.030%, Ti:0.010%~0.030%, surplus is Fe and inevitable impurity.
Further, the production method of the above-mentioned building steel bar containing V, Nb, Ti microalloy, comprises 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, FeTi alloy and carburant, FeV or VN, control the C to be
0.15%~0.30%, Si is that 0.30%~1.00%, Mn is that 0.60%~1.30%, V is that 0.10%~0.80%, Nb is
0.010%~0.030%, Ti 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, adds cored containing N
Line, 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, 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 production method of the above-mentioned building steel bar containing V, Nb, Ti microalloy, molten iron described in step a requires S to contain
Amount≤0.060%.
Wherein, in the production method of the above-mentioned building steel bar containing V, Nb, Ti microalloy, FeSi and FeMn described in step a
Alloy FeSiMn alloy replacings.
Wherein, in the production method of the above-mentioned building steel bar containing V, Nb, Ti microalloy, the inert gas described in step b
For one kind in argon gas or nitrogen.
Wherein, in the production method of the above-mentioned building steel bar containing V, Nb, Ti microalloy, indifferent gas is blown into described in step b
The time of body >=2min.
Wherein, in the production method of the above-mentioned building steel bar containing V, Nb, Ti microalloy, step b out-station temperatures are higher than steel
60~90 DEG C of liquidus temperature.
Wherein, in the production method of the above-mentioned building steel bar containing V, Nb, Ti 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, Ti, and alloying component V is added in steel:
0.010%~0.080%, Nb:0.010%~0.30% and Ti:0.010%~0.030%, then coordinate using in converter smelting
The mode for feeding the core-spun yarn containing N afterwards is adjusted steel grade N content, is rolled using rolling bar production line, and one kind can finally be prepared
The microalloy building steel bar that intensity is high, nitrogen recovery rate is high.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, is worth of widely use.
Embodiment
It is containing V, Nb, Ti microalloy building steel bar, its chemical composition the present invention provides one kind：By weight percentage
Meter, 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%~0.080%, Nb:0.010%~0.030%, Ti:0.010%~
0.030%, surplus is Fe and inevitable impurity.
The present invention adds 0.010%~0.080% V, 0.010%~0.030% Nb and 0.010%~0.030%
Ti be to ensure the aging performance of steel.When using converter smelting steel under normal circumstances, the residual nitrogen in final finished steel
Content is in the range of 0.0030%~0.0065%, using electric furnace smelting steel, residual nitrogen content then 0.0050%~
In the range of 0.0085%.As N content raises in steel, timeliness is deteriorated therewith, and of the invention then use addition 0.010%~
0.010%~0.030% Ti modes of 0.080% V, 0.010%~0.030% Nb sums, to ensure the timeliness of steel
Property, while the solution strengthening effect of nitrogen can also be given full play to, 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, Nb (C, N) particles and Ti (C, N) particle, so that the precipitation of V, Nb and Ti are promoted, can
The precipitation strength and Grain Refinement Effect of vanadium and niobium are more fully played, to improve the comprehensive mechanical property of steel, in equal power
On the premise of learning performance, the usage amount of vanadium, niobium and titanium can be reduced.
Present invention also offers a kind of production method of the building steel bar containing V, Nb, Ti 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 are 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, the alloy containing Ti elements, alloy and carburant containing Nb elements, the carburant is C powder or anthracite, control
C in the range of 0.15%~0.30%, control Si in the range of 0.30%~1.00%, control Mn in 0.60%~1.30% model
In enclosing, V is in the range of 0.010%~0.080% for control, and Nb is in the range of 0.010%~0.030% for control, and control Ti exists
In the range of 0.010%~0.030%；FeSi, FeMn, FeNb, FeTi and FeV or VN alloys are initially added into tapping 1/3,
Tapping must be added to when 2/3；
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 and feeds core-spun yarn
After the completion of tapping, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into inert gas, the inertia being blown into
Gas can be argon gas or nitrogen, be blown into the time of inert gas and should be not less than 2min；Regulation inert gas is blown into
Time is that all kinds of alloys that can make addition in order to ensure that molten steel has enough circulation time fully melt and not less than 2min
It is even；
The inert gas time is blown into more than after 2min, sampling carries out N content detection, and the side of line feeding is used according to inspection result
Method add core-spun yarn containing N, the core-spun yarn containing N predominantly alloy containing N, such as SiN, control molten steel in N content 0.0060%
In the range of~0.0180%；If relatively stable can not sample of N content control carries out N content detection in molten steel after stove, directly feed
Enter core-spun yarn；
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and after the inert gas being blown into
The core-spun yarn containing N can be fed, inert gas can be argon gas or nitrogen, and inert gas is blown into after the completion of line feeding
Time also needs to extend more than 2min, to ensure the uniformity of N element in molten steel, and controls outbound liquid steel temperature；
Thermometric is carried out before outbound, it is ensured that out-station temperature is higher than 60~90 DEG C of the liquidus temperature of steel；
C, 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 by outbound temperature after above-mentioned converter tapping and stove
Degree controls to realize；
The steel billet section that molten steel is casting continuously to form be 150mm × 150mm~200mm × 200mm square billet, less than 150mm ×
The square billet section of 150mm is small to be unfavorable for working continuously for bof process, and the square billet section more than 200mm × 200mm can then extend
Heating time during follow-up rolling steel billet；
The steel billet that molten steel is casting continuously to form, naturally cools to room temperature in atmosphere；
D, heating steel billet and rolling
Heating requirements total heating time of steel billet is 90~120min, and heating furnace maximum heating temperature is 1220 DEG C, highest
Soaking temperature is 1200 DEG C, and steel billet goes out the temperature control of heating furnace in the range of 1000~1200 DEG C；
Final finished specification isPole, or have and defined in GB 1499.2
Ribbed Bar external formWith Ribbed Bar for building, continous way rolling bar production line can be used
Rolled.
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, Ti 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 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 1671 DEG C, and actual tap is at this time
131 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeV,
FeNb, FeTi alloy and anthracite carry out Si, Mn, V, Nb, Ti and C element alloying, wherein Si contains in the FeSi alloys added
It is that V content is that Nb contents are 65% in 54%, FeNb alloys in 82%, FeV alloys to measure as Mn contents in 74%, FeMn alloys,
Ti contents are 40% in FeTi alloys, and C is fixed in anthracite as 92%, and to control in molten steel Si contents be 0.31%, Mn contents are
0.61%th, V content 0.010%, Nb contents are 0.011%, Ti contents are 0.012%, 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, it is 0.0064% to control N content in molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Reduce liquid steel temperature, it is outbound before carry out thermometric again, when liquid steel temperature be 1568 DEG C when it is outbound, and by molten steel be sent to conticaster into
Row casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1547 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, 0.33%
Si, 0.62% Mn, 0.010% V, 0.011% Nb, 0.012% Ti, 0.024% P, 0.021% S,
0.0066% 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 1216 DEG C, and soaking temperature is 1193 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 950 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) be ReL (Rp0.2) be 363MPa, tensile strength be
458MPa, elongation 38.0%, maximum, force percentage of total elongation are 18.1%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite
+ pearlite.
Embodiment 2 is prepared containing V, Nb, Ti 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 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 200mm × 200mm 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 0.053%.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
0.11% C, 0.023% P, 0.024% S, tapping is into ladle when temperature is 1678 DEG C, and actual tap is at this time
132 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeV,
FeNb, FeTi and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74% in the FeSi alloys added,
Mn contents are that the content that V content is Nb in 54%, FeNb alloys in 82%, FeV alloys is 65%, FeTi alloys in FeMn alloys
In Ti contents be 40%, C is fixed in anthracite as 92%, to control in molten steel Si contents be 0.93%, Mn contents are 1.28%,
V content is 0.080%, Nb contents are 0.029%, Ti contents are 0.027%, 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, it is 0.0166% to control N content in molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Reduce liquid steel temperature, it is outbound before carry out thermometric again, when liquid steel temperature be 1582 DEG C when it is outbound, and by molten steel be sent to conticaster into
Row casting.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1526 DEG C during continuous casting,
The liquidus temperature of steel is 1495 DEG C, bag sampling analysis molten steel chemical constituent is 0.29% in conticaster C, 0.96%
Si, 1.28% Mn, 0.080% V, 0.029% Nb, 0.028% Ti, 0.028% P, 0.020% S,
0.0167% 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 1041 DEG C, and soaking temperature is 1005 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 886 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 546MPa, tensile strength 733MPa, elongation are
16.2%th, maximum, force percentage of total elongation is 11.6%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Embodiment 3 is prepared containing V, Nb, Ti 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 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 200mm × 200mm 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
0.08% C, 0.017% P, 0.025% S, tapping is into ladle when temperature is 1666 DEG C, and actual tap is at this time
133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeV,
FeNb, FeTi alloy and anthracite carry out Si, Mn, V, Nb, Ti and C element alloying, wherein Si contains in the FeSi alloys added
It is that V content is that the Nb contents in 54%, FeNb alloys are in 82%, FeV alloys to measure as Mn contents in 74%, FeMn alloys
Ti contents in 65%, FeTi alloy are 40%, and it is 92% that C is fixed in anthracite, and it is 0.64%, Mn to control Si contents in molten steel
Content is 0.97%, V content 0.049%, Nb contents are 0.017%, Ti contents are 0.016%, C content 0.21%.
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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, it is 0.0122% to control N content in molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Reduce liquid steel temperature, it is outbound before carry out thermometric again, when liquid steel temperature be 1579 DEG C when it is outbound, and by molten steel be sent to conticaster into
Row casting.
200mm × 200mm 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 1510 DEG C, bag sampling analysis molten steel chemical constituent is 0.21% in conticaster C, 0.67%
Si, 0.99% Mn, 0.050% V, 0.017% Nb, 0.017% Ti, 0.024% P, 0.018% S,
0.0125% 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 1123 DEG C, and soaking temperature is 1005 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 900 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 451MPa, tensile strength 601, elongation are
21.9%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. containing V, Nb, Ti microalloy building steel bar, it is characterised in that 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%,
S≤0.040%, V:0.010%~0.080%, Nb:0.010%~0.030%, Ti:0.010%~0.030%, surplus is
Fe and inevitable impurity.
2. the production method of the building steel bar containing V, Nb, Ti 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, continuous casting；Steel billet is heated, the rolling of continous way rolling bar production line is become a useful person,
Pole or Ribbed Bar is made in cooling；Core-spun yarn adjustment N, billet heating temperature control are fed in the ladle of chain-wales wherein after stove
950~1220 DEG C are made as, soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；The steel
Base 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%~0.080%, Nb:0.010%~
0.030%th, Ti:0.010%~0.030%, surplus is Fe and inevitable impurity.
3. the production method of the building steel bar according to claim 2 containing V, Nb, Ti 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, FeTi alloy and carburant, FeV or VN, control C be 0.15%~
0.30%th, Si be 0.30%~1.00%, Mn be 0.60%~1.30%, V be 0.10%~0.80%, Nb be 0.010%~
0.030%th, Ti 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, adds core-spun yarn containing N, is controlled
N content is 0.0060%~0.0180% in molten steel processed；
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 production method of the building steel bar according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：Step a
Described in molten iron require S content≤0.060%.
5. the production method of the building steel bar according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：Step a
Described in FeSi and FeMn alloys FeSiMn alloy replacings.
6. the production method of the building steel bar according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：Step b
Described in inert gas be one kind in argon gas or nitrogen.
7. the production method of the building steel bar according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：Step b
Described in be blown into time >=2min of inert gas.
8. the production method of the building steel bar according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：Step b
Out-station temperature is higher than 60~90 DEG C of the liquidus temperature of steel.
9. the production method of the building steel bar according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：Step d
Described in the specification of pole or Ribbed Bar be
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| CN109576583A (en) * | 2018-12-18 | 2019-04-05 | 邯郸钢铁集团有限责任公司 | 500MPa grades of high nitrogen combined microalloying reinforcing bars and its production method |
| CN109694980A (en) * | 2018-12-18 | 2019-04-30 | 邯郸钢铁集团有限责任公司 | The smelting process of high nitrogen 500MPa grades of screw-thread steels of composite alloy microalloying |
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