CN107815604A - Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy - Google Patents
Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy Download PDFInfo
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- CN107815604A CN107815604A CN201711242285.XA CN201711242285A CN107815604A CN 107815604 A CN107815604 A CN 107815604A CN 201711242285 A CN201711242285 A CN 201711242285A CN 107815604 A CN107815604 A CN 107815604A
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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 wire rod 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 invention provides one kind containing V, Nb, Ti microalloy building steel wire rod and its LF stove production methods.The constituent of the wire rod 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 adjusts N to suitable level in feeding core-spun yarn containing N in LF stoves.The inventive method is simple to operate, and nitrogen recovery rate is high and stably, 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 wire rod and its LF stoves
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 generally to add minimal amount for micro alloyed steel under the conditions of 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, the intensity of steel can be significantly improved.
It will thus be seen that the effect of vanadium, niobium and titanium is, but ordinary circumstance inseparable with nitrogen actually in micro alloyed steel
Lower to use converter smelting steel, residual nitrogen content is in the range of 0.0030%~0.065%, and using electric furnace smelting steel, residual nitrogen contains
Amount in most cases will such as give full play to the effect of vanadium, niobium and titanium, be to have to volume in the range of 0.050%~0.085%
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, almost all was using both in the production of micro alloyed steel
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.Ordinary circumstance
The ratio of lower three trade mark nitrogen and vanadium be substantially stationary, respectively 12 ︰ 78,14 ︰ 78,16 ︰ 78, i.e. nitrogen and vanadium ratio most
A height of VN16 16 ︰ 78, i.e., containing 16% N in alloy, contain 78% vanadium.Although alloy of vanadium nitride both contains vanadium and nitrogen content
It is again high, but for micro-alloying technology route different in micro alloyed steel, particularly composite micro-alloyed steel, such as V-Ti-N, very
As for 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 adjusts nitrogen content in microalloy, energy using nitrogenous core-spun yarn is added
Enough N contents being more accurately controlled in steel, the micro alloyed steel nitrogen recovery rate of preparation is high, and cost is low.
First technical problem to be solved by this invention is to provide a kind of containing V, Nb, Ti microalloy building steel wire rod.Should
Containing V, Nb, Ti microalloy building steel wire rod chemical composition be：By weight percentage, C：0.15~0.30%, Si：0.30~
1.00%th, Mn：0.60~1.30%, N：0.0060~0.0180%, P≤0.040%, S≤0.040%, V：0.010~
0.080%th, Nb：0.010~0.030%, Ti：0.010~0.030%, surplus is Fe and inevitable impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Ti microalloy.The LF stoves
Production method comprises the following steps：
It is blast-melted that steel billet is made through converter smelting, the refining of LF stoves, continuous casting；Steel billet is heated, high-speed rod-rolling mill is carried out
Rolling becomes a useful person, cools down pole wire rod or screw wire rod is made；Wherein, core-spun yarn adjustment N is fed after the refining of LF stoves in ladle to contain
Amount；The steel billet composition is C by weight percentage：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%th, Ti：0.010~0.030%, surplus is Fe and inevitable impurity；The billet heating temperature control is 950
~1220 DEG C, soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；The high-speed rod rolls
Laying head process in machine, it is 880~960 degree to control laying temperature；It is described to be cooled to first with 4~8 DEG C/s cooling velocity
600~700 DEG C are cooled to, is then cooled to 400~500 DEG C with 2~3 DEG C/s cooling velocity, finally with 0.5~1.0 DEG C/s
Cooling velocity be cooled to 150~300 DEG C.
Further, the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Ti 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 that molten steel C contains
Measure as 0.05~0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
During tapping 1/3~2/3, FeSi, FeMn, FeNb and FeV or VN alloys are added, and increases C agent, it is 0.15 to control C
~0.30%, Si is 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010~0.080%, Nb be 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, FeTi alloys are added, it is 0.010~0.030% to control Ti, adds core-spun yarn containing N, is controlled in molten steel
N content is 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~200mm × 200mm square billet, is air-cooled to room temperature；
D, heating steel billet and rolling：Billet heating temperature control is 950~1220 DEG C, soaking temperature control for 1000~
1200 DEG C, heating with 90~120min of soaking total time, pole wire rod or screw wire rod are rolled into using high-speed rod-rolling mill, rolled
System cools down after terminating and produces product；Wherein, the Laying head process in the high-speed rod-rolling mill, control laying temperature for 880~
960℃；It is described to be cooled to be cooled to 600~700 DEG C first with 4~8 DEG C/s cooling velocity, then with 2~3 DEG C/s cooling
Speed is cooled to 400~500 DEG C, is finally cooled to 150~300 DEG C with 0.5~1.0 DEG C/s cooling velocity.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Ti microalloy, molten iron described in step a will
Seek S content≤0.06%.
Wherein, it is above-mentioned containing V, Nb, Ti microalloy building steel wire rod LF stove production methods in, FeSi described in step a and
FeMn alloys FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Ti microalloy, the inertia described in step b
Gas is at least one of argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Ti microalloy, it is blown into described in step b lazy
Time >=2min of property gas.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Ti microalloy, step b electrical heating temperatures are high
In 60~90 DEG C of liquidus temperature.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Ti microalloy, pole disk described in step d
The specification of bar or screw wire rod for building is
The present invention adds alloying component V by designing a kind of microalloy building iron containing V, Nb, Ti in steel：0.010~
0.080%th, Nb：0.010~0.030%, Ti：0.010~0.030%, then coordinate and fed using after the refining of LF stoves in ladle
The mode of the core-spun yarn containing N adjusts N content in steel, and coordinates and rolled using high speed wire rolling production line, controls suitable laying temperature
With the parameter such as cooldown rate, it can finally be prepared that a kind of intensity is high, nitrogen recovery rate is high builds containing V, Nb, Ti microalloy
Steel, function admirable.The inventive method is simple to operate, and nitrogen recovery rate is high and stably, moreover it is possible to effectively reduces production cost, is worth pushing away
It is wide to use.
Embodiment
It is containing V, Nb, Ti microalloy building steel wire rod, its chemical composition the 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.
In above-mentioned chemical composition, V is added：0.010%~0.080%, Nb：0.010%~0.030%, Ti：0.010%
~0.030% to being fixed, to ensure the aging performance of steel.Generally use converter process smelting steel, final finished steel
In residual nitrogen content in the range of 0.0030%~0.0065%, using electric furnace smelting steel, residual nitrogen content then exists
In the range of 0.0050%~0.0085%.Higher nitrogen content, ageing to be deteriorated therewith in steel, therefore when nitrogen content is higher than
0.0060%, and with the increase of nitrogen content, it is necessary to add appropriate nitrogen killer and fixed, of the invention then use adds
0.010%~0.080%V, 0.010%~0.030%Nb and 0.010%~0.030%Ti mode, with ensure steel when
Effect 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, vanadium, niobium and titanium
Addition be also more prone to form V (C, N), Nb (C, N) and Ti (C, N) particle, can so as to promote V, Nb and Ti precipitation
Vanadium, niobium and Ti precipitation strength and Grain Refinement Effect are more fully played, to improve the comprehensive mechanical property of steel, equal
On the premise of mechanical property, the usage amount of vanadium, niobium and titanium can be reduced.
Present invention also offers prepare above-mentioned V, Nb, Ti microalloy building steel wire rod bof process technique：Converter smelting →
LF refining+feeding core-spun yarn → is casting continuously to form steel billet → heating steel billet → high-speed wire rolling production line rolling and become a useful person.In detail below
Describe bof process technology of the present invention：
The first step：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, C function 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 taps when tapping temperature is not less than 1650 DEG C
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 agent, and control C is in the range of 0.15%~0.30%, control
Si is in the range of 0.30%~1.00%, and Mn is in the range of 0.60%~1.30% for control, and V is 0.010%~0.080% for control
In the range of, Nb is in the range of 0.010%~0.030% for control.Require in addition that, tap 1/3 when be initially added into FeSi, FeMn,
FeNb and FeV or VN alloys, carbon dust or anthracite etc. increase C agent, and 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.
Second step：Inert gas is blown into after Converter
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.
3rd step：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 detected, and adds FeTi alloys, control Ti 0.010%~
In the range of 0.030%；Core-spun yarn containing N is then added using the method for line feeding according to the testing result of N content in molten steel, controls steel
N content is in the range of 0.0060%~0.0180% in liquid, can if N content control is relatively stable in molten steel after LF stove heats
Do not sample and carry out N content detection, be fed directly into core-spun yarn.The core-spun yarn is nitrogen-containing alloy, such as SiN.
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 Ti and N element in molten steel.
4th step：It is casting continuously to form steel billet
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the temperature 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 ×
150mm square billet section is small to be unfavorable for working continuously for bof process, and the square billet section more than 200mm × 200mm can then extend
Heat 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.
5th step：Heating steel billet and rolling
Heating requirements total heat time of steel billet is 90~120min, and billet heating temperature control is 950~1220 DEG C,
Hot temperature control is 1000~1200 DEG C.
Roughing temperature, entry temperature at finishing in the high-speed rod-rolling mill operation of rolling, exit temperature at finishing, deflection, roll
The inferior parameter in road processed can be set out, but it has to be ensured that finally tell according to appointed condition and rolling speed using routine techniques
The laying temperature of silk machine spinning process, the pole wire rod steel to be spued or Ribbed Bar wire rod steel is controlled in 880~960 DEG C of scopes
It is interior.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, first with 4 DEG C~8 DEG C/s cooling velocity
It is cooled in the range of 600 DEG C~700 DEG C, is then cooled to 2 DEG C~3 DEG C/s cooling velocity in the range of 400 DEG C~500 DEG C,
The collection collection volume that steel is carried out after 150 DEG C~300 DEG C scopes is finally cooled to 0.5 DEG C~1.0 DEG C/s cooling velocity, is finally used
Steel band or steel wire bundling are into the finished product wire rod steel for being readily transported and selling.
Finally illustrate：Final diameter isPole wire rod, or have and GB
The Ribbed Bar of defined is a diameter of in 1499.2Construction(al)steel wire rod, can use high-speed line
Material milling train is 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
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 → LF stove heat → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoBand rib steel
Muscle.
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, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.09% C, 0.020% P, 0.028% S, tapping is into ladle when temperature is 1674 DEG C, and now actual tap is
131 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeV,
FeNb alloys and anthracite carry out Si, Mn, V, Nb and C element alloying, wherein Si contents are 74% 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 FeMn alloys, solid in anthracite
C is determined for 92%, controls in molten steel that Si contents are 0.27%, Mn contents are 0.61%, V content 0.010%, Nb contents are
0.010%th, 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
4~5min of gas, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1676 DEG C, controls in firm water
Ti contents are 40% in 0.010% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, controlled in molten steel
N content is 0.0062%.
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 into conticaster to be poured
Casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1538 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, 0.010% V, 0.011% Nb, 0.010% Ti, 0.024% P, 0.022% S,
0.0063% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 958 DEG C, and soaking temperature is 1004 DEG C, and total heat time, which reaches to come out of the stove after 118min, to be rolled.
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 880 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 4 DEG C/s cooling velocity
To 605 DEG C, 400 DEG C then are cooled to 2 DEG C/s cooling velocity, after being finally cooled to 150 DEG C with 1.0 DEG C/s cooling velocity
The collection collection volume of steel is carried out, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 345MPa, tensile strength 475MPa, and elongation is
35.0%, maximum, force percentage of total elongation is 18.0%, and 180 DEG C of clod washes are qualified, and the tissue of steel is ferrite+pearlite.
Embodiment 2
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 → LF stove heat → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoBand rib steel
Muscle.
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, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.12% C, 0.019% P, 0.023% S, tapping is into ladle when temperature is 1674 DEG C, and now actual tap is
133 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, FeNb and anthracite carry out Si, Mn, V, Nb 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 78%, FeNb alloys in 82%, FeV alloys is 65% in FeMn alloys, in anthracite
Fixed C is 92%, controls in molten steel that Si contents are 0.95%, Mn contents are 1.25%, V content 0.080%, Nb contents are
0.030%th, C content 0.30%.
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
4~5min of gas, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1665 DEG C, controls in firm water
Ti contents are 40% in 0.030% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, controlled in molten steel
N content is 0.0168%.
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 into conticaster to be poured
Casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1529 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, 1.00%
Si, 1.28% Mn, 0.080% V, 0.029% Nb, 0.030% Ti, 0.025% P, 0.028% S,
0.0174% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs areBand
Rib reinforcement.Slab heating temperature is 1214 DEG C, and soaking temperature is 1190 DEG C, and total heat time, which reaches to come out of the stove after 95min, is rolled
System.
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 880 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 4 DEG C/s cooling velocity
To 605 DEG C, 400 DEG C then are cooled to 2 DEG C/s cooling velocity, after being finally cooled to 150 DEG C with 1.0 DEG C/s cooling velocity
The collection collection volume of steel is carried out, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 511MPa, tensile strength 692MPa, and elongation is
22.1%, maximum, force percentage of total elongation is 13.2%, and 180 DEG C of clod washes are qualified, and the tissue of steel is ferrite+pearlite.
Embodiment 3
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 → LF stove heat → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 200mm × 200mm steel billets → heating steel billet → high-speed wire rolling intoBand rib steel
Muscle.
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, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.07% C, 0.023% P, 0.019% S, tapping is into ladle when temperature is 1680 DEG C, and now actual tap is
136 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeV,
FeNb alloys and anthracite carry out Si, Mn, V, Nb and C element alloying, wherein Si contents are 74% in the FeSi alloys added,
Mn contents are that V content is that the Nb contents in 78%, FeNb alloys are 65% in 82%, FeV alloys in FeMn alloys, in anthracite
Fixed C is 92%, controls in molten steel that Si contents are 0.58%, Mn contents are 0.97%, V content 0.054%, Nb contents are
0.024%th, C content 0.25%.
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
4~5min of gas, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1673 DEG C, controls in firm water
Ti contents are 40% in 0.016% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, controlled in molten steel
N content is 0.0106%.
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 into conticaster to be poured
Casting.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1533 DEG C during continuous casting,
The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.25% in conticaster C, 0.60%
Si, 0.97% Mn, 0.055% V, 0.025% Nb, 0.016% Ti, 0.028% P, 0.021% S,
0.0107% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1122 DEG C, and soaking temperature is 1070 DEG C, and total heat time, which reaches to come out of the stove after 97min, to be rolled.
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 920 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 6 DEG C/s cooling velocity
To 695 DEG C, 500 DEG C then are cooled to 2.5 DEG C/s cooling velocity, is finally cooled to 300 with 0.75 DEG C/s cooling velocity
The collection collection volume of steel is carried out after DEG C, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) be ReL (Rp0.2) be 481MPa, tensile strength be
667MPa, elongation 23.1%, maximum, force percentage of total elongation are that 16.2,180 DEG C of clod washes are qualified.The tissue of steel be ferrite+
Pearlite.
Embodiment 4
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 pole for building, and production technology is to be blown into the machine 6 of inert gas → LF stove heats → 6 after converter smelting → stove to flow
Billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoPole.
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, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.09% C, 0.017% P, 0.018% S, tapping is into ladle when temperature is 1681 DEG C, and now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeV,
FeNb alloys and anthracite carry out Si, Mn, V, Nb and C element alloying, wherein Si contents are 74% in the FeSi alloys added,
Mn contents are that V content is that the Nb contents in 78%, FeNb alloys are 65% in 82%, FeV alloys in FeMn alloys, in anthracite
Fixed C is 92%, controls in molten steel that Si contents are 0.62%, Mn contents are 0.97%, V content 0.030%, Nb contents are
0.015%th, 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
4~5min of gas, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1670 DEG C, controls in firm water
Ti contents are 40% in 0.027% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, controlled in molten steel
N content is 0.0141%.
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 into 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 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.63%
Si, 0.98% Mn, 0.030% V, 0.015% Nb, 0.026% Ti, 0.026% P, 0.021% S,
0.0146% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs arePole
Reinforcing bar.Slab heating temperature is 1145 DEG C, and soaking temperature is 1068 DEG C, and total heat time, which reaches to come out of the stove after 99min, to be rolled,
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 910 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 5 DEG C/s cooling velocity
To 680 DEG C, 460 DEG C then are cooled to 2.5 DEG C/s cooling velocity, is finally cooled to 250 with 0.75 DEG C/s cooling velocity
The collection collection volume of steel is carried out after DEG C, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 429MPa, tensile strength 606MPa, and elongation is
28.8%, maximum, force percentage of total elongation is 18.2%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Claims (9)
1. containing V, Nb, Ti microalloy building steel wire rod, 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%th, V：0.010~0.080%, Nb：0.010~0.030%, Ti：0.010~0.030%, surplus is Fe and can not kept away
The impurity exempted from.
2. the LF stove production methods of the building steel wire rod containing V, Nb, Ti microalloy described in claim 1, it is characterised in that：Including
Following steps：
It is blast-melted that steel billet is made through converter smelting, the refining of LF stoves, continuous casting；Steel billet is heated, high-speed rod-rolling mill is rolled
Become a useful person, cool down pole wire rod or screw wire rod is made；Wherein, core-spun yarn adjustment N content is fed after the refining of LF stoves in ladle；Institute
It is C by weight percentage to state steel billet composition：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 billet heating temperature control is 950~1220 DEG C,
Hot temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；Spinning in the high-speed rod-rolling mill
Machine process, it is 880~960 DEG C to control laying temperature；It is described be cooled to be cooled to 600 first with 4~8 DEG C/s cooling velocity~
700 DEG C, 400~500 DEG C then are cooled to 2~3 DEG C/s cooling velocity, it is finally cold with 0.5~1.0 DEG C/s cooling velocity
But to 150~300 DEG C.
3. the LF stove production methods of the building steel wire rod according to claim 2 containing V, Nb, Ti microalloy, it is characterised in that：
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 that molten steel C content is
0.05~0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
During tapping 1/3~2/3, add FeSi, FeMn, FeNb and FeV or VN alloys, and increase C agent, control C be 0.15~
0.30%th, Si is 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010~0.080%, Nb be 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；Molten steel
After bag reaches LF stoves, FeTi alloys are added, it is 0.010~0.030% to control Ti, adds core-spun yarn containing N, controls N in molten steel to contain
Measure as 0.0060~0.0180%；
C, continuous casting：It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, by molten steel be casting continuously to form steel billet section for 150mm ×
150mm~200mm × 200mm square billet, 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 90~120min of soaking total time, pole wire rod or screw wire rod, rolling knot are rolled into using high-speed rod-rolling mill
Cooled down after beam and produce product；Wherein, the Laying head process in the high-speed rod-rolling mill, it is 880~960 to control laying temperature
℃；It is described to be cooled to be cooled to 600~700 DEG C first with 4~8 DEG C/s cooling velocity, then with 2~3 DEG C/s cooling speed
Degree is cooled to 400~500 DEG C, is finally cooled to 150~300 DEG C with 0.5~1.0 DEG C/s cooling velocity.
4. the LF stove production methods of the building steel wire rod according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：
In step a, the molten iron requires S content≤0.06%.
5. the LF stove production methods of the building steel wire rod according to claim 3 containing V, Nb, Ti microalloy, 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 steel wire rod according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：
In step b, described inert gas is at least one of argon gas or nitrogen.
7. the LF stove production methods of the building steel wire rod according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：
In step b, the time >=2min for being blown into inert gas.
8. the LF stove production methods of the building steel wire rod according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：
In step b, electrical heating is higher than 60~90 DEG C of liquidus temperature.
9. the LF stove production methods of the building steel wire rod according to claim 3 containing V, Nb, Ti microalloy, it is characterised in that：
In step d, the specification of the pole wire rod or screw wire rod is
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Cited By (3)
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| CN113201683A (en) * | 2021-04-23 | 2021-08-03 | 玉溪新兴钢铁有限公司 | Method for producing casting blank for HRB400E anti-seismic steel bar by adding high-vanadium pig iron into vanadium-titanium molten iron |
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| CN113201683A (en) * | 2021-04-23 | 2021-08-03 | 玉溪新兴钢铁有限公司 | Method for producing casting blank for HRB400E anti-seismic steel bar by adding high-vanadium pig iron into vanadium-titanium molten iron |
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