CN107747053A - Steel wire rod and its LF stove production methods are built containing V, Nb microalloy - Google Patents
Steel wire rod and its LF stove production methods are built containing V, Nb microalloy Download PDFInfo
- Publication number
- CN107747053A CN107747053A CN201711242236.6A CN201711242236A CN107747053A CN 107747053 A CN107747053 A CN 107747053A CN 201711242236 A CN201711242236 A CN 201711242236A CN 107747053 A CN107747053 A CN 107747053A
- Authority
- CN
- China
- Prior art keywords
- steel
- wire rod
- microalloy
- cooled
- production methods
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- 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
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
Abstract
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb 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 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%~0.100%, Nb：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 microalloy building steel wire rod and its production of LF stoves
Method.
Background technology
Micro alloyed steel is primarily referred to as adding certain either micro element of minimal amount in steel with regard to that can significantly improve performance
Steel, particularly improve steel intensity index.It is either micro- mainly 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 actually micro alloyed steel vanadium, niobium and titanium is inseparable with nitrogen, but generally
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%, the effect of vanadium, niobium and titanium is in most cases such as given full play to, is to have to additionally
Add what nitrogen could 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 microalloy building steel wire rod.This contain V,
Nb microalloys building steel wire rod chemical composition be：By weight percentage, C：0.15~0.30%, Si：0.30~1.00%,
Mn：0.60~1.30%, N：0.0060~0.0180%, P≤0.040%, S≤0.040%, V：0.010%~0.100%,
Nb：0.010%~0.030%, surplus is Fe and inevitable impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building steel wire rod containing V, Nb microalloy.The production method
Comprise 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%~0.100%, Nb：0.010%
~0.030%, surplus is Fe and inevitable impurity；The billet heating temperature control is 950~1220 DEG C, soaking temperature
Control as 1000~1200 DEG C, heating and 90~120min of soaking total time；Laying head process in the high-speed rod-rolling mill,
It is 880~960 degree 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 400~500 DEG C are cooled to 2~3 DEG C/s cooling velocity, are finally cooled to 0.5~1.0 DEG C/s cooling velocity
150~300 DEG C.
Further, the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb microalloy, comprise the following steps：
A, converter smelting：Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat 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 0.010~0.100%, 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, core-spun yarn containing N is added, 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~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 microalloy, molten iron described in step a requires S
Content≤0.06%.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb microalloy, FeSi and FeMn described in step a
Alloy FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb microalloy, the inert gas described in step b
For 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 microalloy, indifferent gas is blown into described in step b
The time of body >=2min.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb microalloy, step b electrical heating is higher than liquidus curve
60~90 DEG C of temperature.
Wherein, it is above-mentioned containing V, Nb microalloy building steel wire rod LF stove production methods in, pole wire rod described in step d or
The specification of screw wire rod for building is
The present invention adds alloying component V by designing a kind of microalloy building iron containing V, Nb in steel：0.010~
0.100%, Nb：0.010~0.030%, then coordinate and adjusted by the way of core-spun yarn containing N is fed in ladle after the refining of LF stoves
N content in steel, and coordinate and rolled using high speed wire rolling production line, the parameters such as suitable laying temperature and cooldown rate are controlled, most
The microalloy building iron containing V, Nb that a kind of intensity is high, nitrogen recovery rate is high, function admirable can be prepared eventually.The inventive method is grasped
Make simple, nitrogen recovery rate is high and stably, moreover it is possible to effectively reduces production cost, is worth of widely use.
Embodiment
It is containing V, Nb microalloy building steel wire rod, its chemical composition the invention provides one kind：By weight percentage, C：
0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N：0.0060%~0.0180%, P≤
0.040%th, S≤0.040%, V：0.010%~0.100%, Nb：0.010%~0.030%, surplus is for Fe and unavoidably
Impurity.
In above-mentioned chemical composition, containing 0.0060%~0.0180% nitrogen in steel, using add 0.010%~
0.100%V and 0.010%~0.030%Nb is to being fixed, to ensure the aging performance of steel.Generally use converter
Method smelting steel, the residual nitrogen content in final finished steel are residual using electric furnace smelting steel in the range of 0.0030%~0.0065%
Stay nitrogen content then in the range of 0.0050%~0.0085%.Higher nitrogen content, ageing to be deteriorated therewith in steel, therefore works as nitrogen
Content is higher than 0.006%, and with the increase of nitrogen content, it is necessary to and add appropriate nitrogen killer and fixed, it is of the invention then use
0.010%~0.100%V and 0.010%~0.030%Nb mode is added, to ensure the ageing of steel, while can also be filled
The solution strengthening effect of nitrogen is waved in distribution, so as to improve the intensity of steel, reduces the cost of alloy of steel.
In addition, in above-mentioned chemical composition, because the nitrogen content in molten steel is higher than residual nitrogen content in usual steel, vanadium and niobium plus
Enter and be also more prone to form V (C, N) and Nb (C, N) particle, so as to promote V and Nb precipitation, can more fully play
The precipitation strength and Grain Refinement Effect of vanadium and niobium, to improve the comprehensive mechanical property of steel, on the premise of equal mechanical property,
The usage amount of vanadium and niobium can be reduced.
Present invention also offers prepare above-mentioned V, Nb microalloy building steel wire rod bof process technique：Converter smelting → LF essences
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.Describe in detail below
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%~0.100% 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, FeV or VN alloy, and 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；Then used and fed according to the testing result of N content in molten steel
The method of line adds core-spun yarn containing N, and N content is in the range of 0.0060%~0.0180% in control molten steel, if LF stove heats
N content control is relatively stable in molten steel afterwards, can not sample and carry out N content detection, be fed directly into core-spun yarn.The core-spun yarn be containing
Nitrogen 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 the 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 intoPole 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
0.11% C, 0.024% P, 0.027% S, tapping is into ladle when temperature is 1676 DEG C, and now actual tap is
132 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 0.60%, V content 0.011%, 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 bag containing N is added using the method for line feeding when liquid steel temperature reaches 1578 DEG C
Cored wire, it is 0.0062% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent into conticaster to be cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1534 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.16% in conticaster C, 0.33%
Si, 0.62% Mn, 0.010% V, 0.010% Nb, 0.028% P, 0.021% S, 0.0064% 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 954 DEG C, and soaking temperature is 1003 DEG C, and total heat time, which reaches to come out of the stove after 115min, 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 351MPa, tensile strength 476MPa, and elongation is
35.2%, maximum, force percentage of total elongation is 19.0%, and 180 DEG C of clod washes are qualified.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, 0.026% S, tapping is into ladle when temperature is 1678 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 and C element alloying, wherein Si contents are 74%, FeMn 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 alloy, fixed in anthracite
C is 92%, controls in molten steel that Si contents are 0.95%, Mn contents are 1.27%, V content 0.100%, 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 bag containing N is added using the method for line feeding when liquid steel temperature reaches 1582 DEG C
Cored wire, it is 0.0174% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent into conticaster to be cast.
150mm × 150mm 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 0.30% in conticaster C, 0.95%
Si, 1.29% Mn, 0.10% V, 0.030% Nb, 0.027% P, 0.021% S, 0.0179% 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 1216 DEG C, and soaking temperature is 1195 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 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 516MPa, tensile strength 696MPa, and elongation is
21.1%, maximum, force percentage of total elongation is 13.1%, 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 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
0.07% C, 0.024% P, 0.025% S, tapping is into ladle when temperature is 1679 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 and C element alloying, wherein Si contents are 74%, FeMn 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 alloy, fixed in anthracite
C is 92%, controls in molten steel that Si contents are 0.57%, Mn contents are 0.96%, V content 0.066%, Nb contents are
0.025%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 bag containing N is added using the method for line feeding when liquid steel temperature reaches 1587 DEG C
Cored wire, it is 0.0124% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent into conticaster to be cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1537 DEG C during continuous casting,
The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.26% in conticaster C, 0.62%
Si, 0.94% Mn, 0.065% V, 0.025% Nb, 0.024% P, 0.023% S, 0.03% Cr,
0.0131% 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 1218 DEG C, and soaking temperature is 1196 DEG C, and total heat time, which reaches to come out of the stove after 96min, 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 that ReL (Rp0.2) is 470MPa, and tensile strength is
651MPa, elongation 22.7%, maximum, force percentage of total elongation are 16.3%, and 180 DEG C of clod washes are qualified.The tissue of steel is 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 reinforcing 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 intoPole 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
0.06% C, 0.022% P, 0.019% S, tapping is into ladle when temperature is 1677 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 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 0.56%, Mn contents are 0.97%, V content 0.030%, Nb contents are
0.015%th, C content 0.15%.After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, the molten steel into ladle
Nitrogen is blown into, is blown into 4~5min of nitrogen, all kinds of alloys of addition is fully melted 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 1586 DEG C
Cored wire, it is 0.097% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent into conticaster to be cast.
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 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.65%
Si, 0.98% Mn, 0.030% V, 0.015 Nb, 0.028% P, 0.019% S, 0.0099% N, remaining is Fe
With 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 1153 DEG C, and soaking temperature is 1099 DEG C, and total heat time, which reaches to come out of the stove after 106min, 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 pole wire roll 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 that ReL (Rp0.2) is 432MPa, and tensile strength is
608MPa, elongation 27.5%, maximum, force percentage of total elongation are 16.2%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite
+ pearlite.
Claims (9)
1. containing V, Nb 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%~0.100%, Nb：0.010%~0.030%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building steel wire rod containing V, Nb microalloy described in claim 1, it is characterised in that：Including following
Step：
It is blast-melted that steel billet is made through converter smelting, 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%~0.100%, Nb：0.010%~
0.030%, surplus is Fe and inevitable impurity；The billet heating temperature control is 950~1220 DEG C, soaking temperature control
1000~1200 DEG C are made as, is heated and 90~120min of soaking total time；Laying head process in the high-speed rod-rolling mill, control
Laying temperature processed is 880~960 DEG C；It is described to be cooled to be cooled to 600~700 DEG C first with 4~8 DEG C/s cooling velocity, so
400~500 DEG C are cooled to 2~3 DEG C/s cooling velocity afterwards, is finally cooled to 150 with 0.5~1.0 DEG C/s cooling velocity
~300 DEG C.
3. the LF stove production methods of the building steel wire rod according to claim 2 containing V, Nb microalloy, it is characterised in that：Including
Following steps：
A, converter smelting：Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat 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 0.010~0.100%, 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, core-spun yarn containing N is added, 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, 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 microalloy, it is characterised in that：Step
In 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 microalloy, it is characterised in that：Step
In 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 microalloy, it is characterised in that：Step
In 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 microalloy, it is characterised in that：Step
In 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 microalloy, it is characterised in that：Step
In b, electrical heating temperature 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 microalloy, it is characterised in that：Step
In d, the specification of the pole wire rod or screw wire rod is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711242236.6A CN107747053A (en) | 2017-11-30 | 2017-11-30 | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711242236.6A CN107747053A (en) | 2017-11-30 | 2017-11-30 | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107747053A true CN107747053A (en) | 2018-03-02 |
Family
ID=61249877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711242236.6A Pending CN107747053A (en) | 2017-11-30 | 2017-11-30 | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107747053A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109161812A (en) * | 2018-11-23 | 2019-01-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar wire rod and its production method |
| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
| CN110205558A (en) * | 2019-06-05 | 2019-09-06 | 盐城市联鑫钢铁有限公司 | A kind of HRB400 steel alloy and its smelting process method containing Nb, V |
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN113293337A (en) * | 2021-04-28 | 2021-08-24 | 顿口渔具科技(东莞)有限公司 | Niobium-vanadium composite microalloyed high-carbon steel wire for fishhook |
| CN114293096A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 500 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775538A (en) * | 2010-03-24 | 2010-07-14 | 中南大学 | Technique for producing 500MPa level high-strength quake-proof reinforcing steel bar |
| CN102071357A (en) * | 2011-01-05 | 2011-05-25 | 武钢集团昆明钢铁股份有限公司 | Nitrogenous niobium vanadium microalloying 500MPa and 550MPa high-intensity aseismic reinforcing steel bar and melting method |
| CN104018075A (en) * | 2014-06-25 | 2014-09-03 | 武汉钢铁(集团)公司 | Hot rolled ribbed steel bar with yield-to-tensile ratio of less than or equal to 0.8 and Rel of more than or equal to 600MPa, and production method |
| CN104213033A (en) * | 2014-09-03 | 2014-12-17 | 马钢(集团)控股有限公司 | 60-steel hot rolling coil rod with high strength and high plasticity and production method thereof |
| CN106591700A (en) * | 2016-12-05 | 2017-04-26 | 邢台钢铁有限责任公司 | Hot rolled wire rod for high-strength cut steel wires and production method of hot rolled wire rod |
| CN107385334A (en) * | 2017-08-02 | 2017-11-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of steel strand wires wire rod and its manufacturing process |
-
2017
- 2017-11-30 CN CN201711242236.6A patent/CN107747053A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775538A (en) * | 2010-03-24 | 2010-07-14 | 中南大学 | Technique for producing 500MPa level high-strength quake-proof reinforcing steel bar |
| CN102071357A (en) * | 2011-01-05 | 2011-05-25 | 武钢集团昆明钢铁股份有限公司 | Nitrogenous niobium vanadium microalloying 500MPa and 550MPa high-intensity aseismic reinforcing steel bar and melting method |
| CN104018075A (en) * | 2014-06-25 | 2014-09-03 | 武汉钢铁(集团)公司 | Hot rolled ribbed steel bar with yield-to-tensile ratio of less than or equal to 0.8 and Rel of more than or equal to 600MPa, and production method |
| CN104213033A (en) * | 2014-09-03 | 2014-12-17 | 马钢(集团)控股有限公司 | 60-steel hot rolling coil rod with high strength and high plasticity and production method thereof |
| CN106591700A (en) * | 2016-12-05 | 2017-04-26 | 邢台钢铁有限责任公司 | Hot rolled wire rod for high-strength cut steel wires and production method of hot rolled wire rod |
| CN107385334A (en) * | 2017-08-02 | 2017-11-24 | 首钢水城钢铁（集团）有限责任公司 | A kind of steel strand wires wire rod and its manufacturing process |
Non-Patent Citations (1)
| Title |
|---|
| 许后昌等: "HRB400E抗震钢筋研制与开发", 《四川冶金》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109161812A (en) * | 2018-11-23 | 2019-01-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 500MPa grades contain V, Nb microalloy high yield ratio anti-seismic steel bar wire rod and its production method |
| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
| CN110205558A (en) * | 2019-06-05 | 2019-09-06 | 盐城市联鑫钢铁有限公司 | A kind of HRB400 steel alloy and its smelting process method containing Nb, V |
| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN113293337A (en) * | 2021-04-28 | 2021-08-24 | 顿口渔具科技(东莞)有限公司 | Niobium-vanadium composite microalloyed high-carbon steel wire for fishhook |
| CN114293096A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 500 MPa-grade vanadium-titanium micro-alloying hot-rolled steel bar and production method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107747053A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy | |
| CN102703812B (en) | Titanium microalloyed 500-MPa high-strength steel bar and production method thereof | |
| CN107955906A (en) | Steel bar and its production method are built containing V, Nb microalloy | |
| CN107955919A (en) | Steel bar and its LF stove production methods are built containing V, Nb microalloy | |
| CN107815603A (en) | Steel Bar and its LF stove production methods are built containing V, Nb, Cr microalloy | |
| CN107815525A (en) | Microalloy containing Nb builds steel wire rod and its production method | |
| CN108950135A (en) | The production method of HRB400 reinforcing bar and HRB400 reinforcing bar | |
| CN107747047A (en) | Steel Bar and its production method are built containing Nb, Cr microalloy | |
| CN107955911A (en) | Microalloy containing Nb builds steel bar and its LF stove production methods | |
| CN107955905A (en) | Microalloy containing V builds steel bar and its LF stove production methods | |
| CN107815608A (en) | Microalloy containing Ti builds Steel Bar and its LF stove production methods | |
| CN107964630A (en) | Microalloy containing Ti builds steel bar and its production method | |
| CN107974619A (en) | Microalloy containing V builds steel bar and its production method | |
| CN107747046A (en) | Steel Bar and its production method are built containing V, Ti microalloy | |
| CN107815604A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy | |
| CN107955899A (en) | Steel wire rod and its production method are built containing V, Nb microalloy | |
| CN107815601A (en) | Steel wire rod and its LF stove production methods are built containing Nb, Cr microalloy | |
| CN107955913A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb, Cr microalloy | |
| CN107747059A (en) | Steel wire rod and its production method are built containing V, Ti, Cr microalloy | |
| CN107815526A (en) | Microalloy containing Nb builds Steel Bar and its production method | |
| CN107723605A (en) | Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy | |
| CN107955918A (en) | Steel bar and its LF stove production methods are built containing V, Cr microalloy | |
| CN107955904A (en) | Steel bar and its production method are built containing V, Nb, Ti microalloy | |
| CN107815609A (en) | Steel Bar and its LF stove production methods are built containing Nb, Cr microalloy | |
| CN107747052A (en) | Microalloy containing V builds steel wire rod and its production method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180302 |