CN107746909A - Microalloy containing V builds steel wire rod and its LF stove production methods - Google Patents
Microalloy containing V builds steel wire rod and its LF stove production methods Download PDFInfo
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- CN107746909A CN107746909A CN201711243805.9A CN201711243805A CN107746909A CN 107746909 A CN107746909 A CN 107746909A CN 201711243805 A CN201711243805 A CN 201711243805A CN 107746909 A CN107746909 A CN 107746909A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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 a kind of building steel wire rod of microalloy containing V and its LF stove production methods.The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, and the invention provides a kind of building steel wire rod of microalloy containing V 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：0.010~0.160%, 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 a kind of the building steel wire rod of microalloy containing V and its LF stove producers
Method.
Background technology
Micro alloyed steel is primarily referred to as adding certain either micro element of minimal amount in steel with regard to that can significantly improve performance
Steel, particularly improve steel intensity index.It is either micro- mainly 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.General feelings
The ratio of three trade mark nitrogen and vanadium is substantially stationary, respectively 12 ︰ 78,14 ︰ 78,16 ︰ 78, the i.e. ratio of nitrogen and vanadium under condition
Up to VN16 16 ︰ 78, i.e., containing 16% N in alloy, contain 78% vanadium.Although alloy of vanadium nitride both contains containing vanadium and nitrogen
Amount is again high, but for micro-alloying technology route different in micro alloyed steel, particularly composite micro-alloyed steel, such as V-Ti-N,
Even V-Ti-Nb-N, and it is unable to meet demand.
The content of the invention
The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, and the present invention carries
A kind of new method for preparing nitrogen-containing alloy is supplied.This method 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 building of microalloy containing V steel wire rod.This contains the micro- conjunctions of V
Gold 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：0.010~0.160%, surplus is
Fe and inevitable impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building of microalloy containing V steel wire rod.The LF stove producers
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：0.010~0.160%, surplus is for Fe and not
Evitable impurity；The billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, is added
Heat and 90~120min of soaking total time；Laying head process in the high-speed rod-rolling mill, control laying temperature for 880~
960 degree；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.
Further, the LF stove production methods of the above-mentioned building of microalloy containing V steel wire rod, 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, add FeSi, FeMn 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%~0.160%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；
After steel ladle reaches LF stoves, 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 of microalloy containing V steel wire rod, molten iron described in step a requires S contents
≤ 0.06%.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel wire rod, FeSi described in step a and FeMn are closed
Gold uses FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel wire rod, the inert gas described in step b is
At least one of argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel wire rod, inert gas is blown into described in step b
Time >=2min.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing V steel wire rod, step b electrical heating temperatures are higher than steel
60~90 DEG C of liquidus temperature.
Wherein, in the LF stove production methods of above-mentioned microalloy containing V building steel wire rod, pole wire rod described in step d or build
Build and be with the specification of screw wire rod
The present invention adds alloying component V by designing a kind of microalloy building iron containing V in steel：0.010%~
0.160%, then coordinate and adjust N content in steel by the way of core-spun yarn containing N is fed in ladle after the refining of LF stoves, and coordinate and adopt
Rolled with high speed wire rolling production line, control the parameters such as suitable laying temperature and cooldown rate, one kind can finally be prepared
The building iron of microalloy containing V that intensity is high, nitrogen recovery rate is high, function admirable.The inventive method is simple to operate, and nitrogen recovery rate is high and steady
It is fixed, moreover it is possible to effectively reduce production cost, be worth of widely use.
Embodiment
The invention provides a kind of building of microalloy containing V steel wire rod, its chemical composition is：By weight percentage, C：
0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N：0.0060%~0.0180%, P≤
0.040%th, S≤0.040%, V：0.010%~0.160%, surplus is Fe and inevitable impurity.
In above-mentioned chemical composition, containing 0.0060%~0.0180% nitrogen in steel, given using 0.010%~0.160%V
It is fixed, to ensure the aging performance of steel.Generally use converter process smelting steel, the residual nitrogen in final finished steel contains
Amount is in the range of 0.0030%~0.0065%, and using electric furnace smelting steel, residual nitrogen content is then 0.0050%~0.0085%
In the range of.Higher nitrogen content, ageing to be deteriorated therewith in steel, therefore, when nitrogen content is higher than 0.006%, and with nitrogen content
Increase, it is necessary to add appropriate nitrogen killer and fixed, it is of the invention then by the way of 0.010%~0.160% vanadium is added,
To ensure the ageing of steel, while the solution strengthening effect of nitrogen can also be given full play to, so as to improve the intensity of steel, reduce steel
Cost of alloy.
In addition, in above-mentioned chemical composition, because the nitrogen content in molten steel is higher than residual nitrogen content in usual steel, the addition of vanadium
It is more prone to form V (C, N) particle, so as to promote the precipitation of vanadium, can more fully plays the precipitation strength and crystalline substance of vanadium
Grain refining effect, to improve the comprehensive mechanical property of steel.
Present invention also offers prepare the above-mentioned building of microalloy containing V 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 are no more than 0.025%, S is not more than 0.035%, and tap 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, and carbon dust or anthracite etc. increase C agent, and control C is in the range of 0.15%~0.30%, control Si is 0.30%~1.00%
In the range of, Mn is in the range of 0.60%~1.30% for control, and V is in the range of 0.010%~0.160% for control.Require in addition that,
Tap 1/3 when be initially added into FeSi, FeMn, FeV alloy or VN alloys, and carbon dust or anthracite etc. increase C agent, tap to 2/3
Shi Bixu is added.
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
0.09% C, 0.021% P, 0.025% S, tapping is into ladle when temperature is 1674 DEG C, and now actual tap is
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that V content is 78% in 82%, FeV alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.28%th, Mn contents be 0.60%, V content 0.011%, 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 1574 DEG C
Cored wire, it is 0.0061% 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 1543 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.32%
Si, 0.62% Mn, 0.029% P, 0.021% S, 0.0062% N, 0.03% Cr, remaining is for Fe and unavoidably
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 959 DEG C, and soaking temperature is 1005 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 312MPa, tensile strength 473MPa, and elongation is
36..2%, maximum, force percentage of total elongation is 18.9%, 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, 0.017% P, 0.024% S, tapping is into ladle when temperature is 1681 DEG C, and now actual tap is
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that V content is 78% in 82%, FeV alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.96%th, Mn contents be 1.29%, V content 0.158%, C content 0.29%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
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 1579 DEG C
Cored wire, it is 0.0172% 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 1524 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, 0.96%
Si, 1.28% Mn, 0.156% V, 0.017% P, 0.022% S, 0.0180% N, 0.03% Cr, remaining is
Fe and inevitable other impurity, specification areRibbed Bar.Remaining is Fe and inevitable other impurity.Casting
Base 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 960 DEG C, and soaking temperature is 1006 DEG C, and total heat time, which reaches to come out of the stove after 113min, 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.
Examine compared steel mechanical property be：ReL (Rp0.2) is 518MPa, tensile strength 691MPa, and elongation is
18.1%, maximum, force percentage of total elongation is 12.1%, and 180 DEG C of clod washes are qualified, and 180 DEG C of clod washes are qualified.The tissue of steel be 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
0.11% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1682 DEG C, and now actual tap is
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that V content is 78% in 82%, FeV alloys, and it is 92% that C is fixed in anthracite, controls in molten steel and controls in molten steel
Si contents are 0.61%, Mn contents are 0.92%, V content 0.070%, C content 0.21%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
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 0.0121% 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 0.23% in conticaster C, 0.62%
Si, 0.96% Mn, 0.070% V, 0.026% P, 0.022% S, 0.0121% N, 0.03% Cr, 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 1124 DEG C, and soaking temperature is 1070 DEG C, and total heat time, which reaches to come out of the stove after 98min, 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 that ReL (Rp0.2) is 445MPa, and tensile strength is
618MPa, elongation 22.9%, maximum, force percentage of total elongation are 16.1%, 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
0.14% C, 0.024 P, 0.027% S, tapping is into ladle when temperature is 1675 DEG C, and now actual tap is 132
Ton (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeV alloy and
Anthracite carries out Si, Mn, V and C element alloying, wherein Si contents are Mn in 74%, FeMn alloys in the FeSi alloys added
Content is that V content is 78% in 82%, FeV alloys, and it is 92% that C is fixed in anthracite, controls and controls Si in molten steel to contain in molten steel
To measure as 0.56%, Mn contents be 0.81%, V content 0.041%, 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 1582 DEG C
Cored wire, it is 0.0101% 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 1539 DEG C during continuous casting,
The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.17% in conticaster C, 0.65%
Si, 0.78% Mn, 0.040% V, 0.024% P, 0.022% S, 0.0099% N, 0.03% Cr, 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 areCircle
Bar reinforcement.Slab heating temperature is 1155 DEG C, and soaking temperature is 1105 DEG C, and total heat time, which reaches to come out of the stove after 101min, 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 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 422MPa, and tensile strength is
591MPa, elongation 26.3%, maximum, force percentage of total elongation are 17.1%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite
+ pearlite.
Claims (9)
1. microalloy containing V builds 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：0.010~0.160%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building steel wire rod of microalloy containing V described in claim 1, it is characterised in that：Including following step
Suddenly：
It is blast-melted that steel billet is made through converter smelting, 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：0.010~0.160%, surplus is for Fe and inevitably
Impurity；The billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and soaking
90~120min of total time；Laying head process in the high-speed rod-rolling mill, it is 880~960 DEG C to control laying temperature；It is described
It is cooled to be cooled to 600~700 DEG C first with 4~8 DEG C/s cooling velocity, is then cooled to 2~3 DEG C/s cooling velocity
400~500 DEG C, finally it is cooled to 150~300 DEG C with 0.5~1.0 DEG C/s cooling velocity.
3. the LF stove production methods of the building of microalloy containing V steel wire rod according to claim 2, it is characterised in that：Including with
Lower step：
A, converter smelting：Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat 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, FeSi, FeMn and FeV or VN alloys are added, and increases C agent, control C be 0.15~0.30%,
Si is 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010%~0.160%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；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 of microalloy containing V steel wire rod according to claim 3, it is characterised in that：Step a
In, the molten iron requires S content≤0.06%.
5. the LF stove production methods of the building of microalloy containing V steel wire rod according to claim 3, it is characterised in that：Step a
In, FeSi the and FeMn alloys FeSiMn alloy replacings.
6. the LF stove production methods of the building of microalloy containing V steel wire rod according to claim 3, it is characterised in that：Step b
In, described inert gas is at least one of argon gas or nitrogen.
7. the LF stove production methods of the building of microalloy containing V steel wire rod according to claim 3, it is characterised in that：Step b
In, the time >=2min for being blown into inert gas.
8. the LF stove production methods of the building of microalloy containing V steel wire rod according to claim 3, it is characterised in that：Step b
In, electrical heating temperature is higher than 60~90 DEG C of liquidus temperature.
9. the LF stove production methods of the building of microalloy containing V steel wire rod according to claim 3, it is characterised in that：Step d
In, the specification of the pole wire rod or screw wire rod is
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468534A (en) * | 2018-11-23 | 2019-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V and its production method |
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|---|---|---|---|---|
| CN104372247A (en) * | 2014-11-04 | 2015-02-25 | 武钢集团昆明钢铁股份有限公司 | 600MPa high-strength antiseismic coil rod twisted steel bar and preparation method thereof |
| CN105400927A (en) * | 2015-12-24 | 2016-03-16 | 马鞍山中科冶金材料科技有限公司 | Multi-element nitralloy core-spun yarn and application and application method of same to HRB400 steel reinforcing treatment technology |
| CN105908091A (en) * | 2016-04-29 | 2016-08-31 | 河北钢铁股份有限公司承德分公司 | Hot rolled reinforced bar for high-impact-toughness 500-MPa anchor rod and production method |
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2017
- 2017-11-30 CN CN201711243805.9A patent/CN107746909A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372247A (en) * | 2014-11-04 | 2015-02-25 | 武钢集团昆明钢铁股份有限公司 | 600MPa high-strength antiseismic coil rod twisted steel bar and preparation method thereof |
| CN105400927A (en) * | 2015-12-24 | 2016-03-16 | 马鞍山中科冶金材料科技有限公司 | Multi-element nitralloy core-spun yarn and application and application method of same to HRB400 steel reinforcing treatment technology |
| CN105908091A (en) * | 2016-04-29 | 2016-08-31 | 河北钢铁股份有限公司承德分公司 | Hot rolled reinforced bar for high-impact-toughness 500-MPa anchor rod and production method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468534A (en) * | 2018-11-23 | 2019-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The 500MPa grades of high yield ratio anti-seismic steel bar wire rods of microalloy containing V and its production method |
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Application publication date: 20180302 |