CN107955913A - Steel wire rod and its LF stove production methods are built containing V, Nb, Cr microalloy - Google Patents
Steel wire rod and its LF stove production methods are built containing V, Nb, Cr microalloy Download PDFInfo
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- CN107955913A CN107955913A CN201711239846.0A CN201711239846A CN107955913A CN 107955913 A CN107955913 A CN 107955913A CN 201711239846 A CN201711239846 A CN 201711239846A CN 107955913 A CN107955913 A CN 107955913A
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb, Cr 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 present invention provides one kind containing V, Nb, Cr 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%, Cr：0.10%~0.60%, 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 method of the present invention is easy to operate, and nitrogen recovery rate is high and stablizes, moreover it is possible to effectively reduces production cost, is worth of widely use.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb, Cr 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 usually to add minimal amount for micro alloyed steel under the conditions of the prior art
Measure vanadium, niobium and titanium and obtain.The mechanism of action of microalloying is：After vanadium, niobium and titanium as trace element add molten steel, with steel
Carbon and nitrogen in liquid combine, and form carbon, nitrogen compound particle, i.e. V (C, N), Nb (C, N) and Ti (C, N) particle, these particles
There is certain precipitation strength and crystal grain refinement, 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 is in the range of 0.050%~0.085%, in most cases.The effect of vanadium, niobium and titanium is such as given full play to, is to have to
It is extra 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 is substantially stationary, be respectively 12 ︰ 78,14 ︰ 78,16 ︰ 78, the i.e. ratio of nitrogen and vanadium most
16 ︰ 78 of a height of VN16, 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, composite micro-alloyed steel, such as V-Ti-N are particularly, 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, Cr microalloy building steel wire rod.Should
Containing V, Nb, Cr 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~
0.100%th, Nb：0.010~0.030%, Cr：0.10~0.60%, 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, Cr 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 carries 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 component 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%th, Cr：0.10~0.60%, surplus is Fe and inevitable impurity；Billet heating temperature control for 950~
1220 DEG C, soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；The high-speed rod-rolling mill
In Laying head process, control laying temperature be 880~960 DEG C；It is described be cooled to it is cold with the cooling velocity of 4~8 DEG C/s first
But to 600~700 DEG C, 400~500 DEG C then are cooled to the cooling velocity of 2~3 DEG C/s, finally with 0.5~1.0 DEG C/s's
Cooling velocity is cooled to 150~300 DEG C.
Further, the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Cr 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%, whens liquid steel temperature >=1650 DEG C taps；
During tapping 1/3~2/3, FeSi, FeMn, FeCr, FeNb and FeV or VN alloys are added, and increases C agent, controls the C to be
0.15~0.30%, Si is 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010~0.100%, Cr be 0.10~
0.60%th, Nb is 0.010~0.030%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；
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
The square billet of × 150mm~200mm × 200mm, 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 terminates postcooling up to 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 the cooling velocity of 4~8 DEG C/s, then with the cooling of 2~3 DEG C/s
Speed is cooled to 400~500 DEG C, is finally cooled to 150~300 DEG C with the cooling velocity of 0.5~1.0 DEG C/s.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing V, Nb, Cr microalloy, molten iron described in step a will
Seek S content≤0.06%.
Wherein, it is above-mentioned containing V, Nb, Cr 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, Cr 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, Cr 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, Cr 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, Cr 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, Cr in steel：0.010%
~0.100%, Nb：0.010~0.030%, Cr：0.10%~0.60%, then coordinate and fed using after the refining of LF stoves in ladle
The mode for entering the core-spun yarn containing N adjusts N content in steel, and coordinates and rolled using high speed wire rolling production line, controls suitable spinning temperature
The parameter such as degree and cooldown rate, can finally be prepared V, Nb, Cr microalloy that contains that a kind of intensity is high, nitrogen recovery rate is high and build
Steel, function admirable.The method of the present invention is easy to operate, and nitrogen recovery rate is high and stablizes, moreover it is possible to effectively reduces production cost, is worth pushing away
It is wide to use.
Embodiment
It is containing V, Nb, Cr microalloy building steel wire rod, its chemical composition the present invention provides one kind：By weight percentage
Meter, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N：0.0060%~0.0180%,
P≤0.040%, S≤0.040%, V：0.010%~0.100%, Nb：0.010%~0.030%, Cr：0.10%~
0.60%, surplus is Fe and inevitable 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.Converter is used under normal circumstances
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, timeliness are deteriorated therewith in steel, therefore work as nitrogen
Content is higher than 0.006%, and with the increase of nitrogen content, it is necessary to and add suitable nitrogen killer and fixed, it is of the invention then use
The mode of 0.010%~0.100%V and 0.010%~0.030%Nb is added, to ensure the timeliness 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 the precipitation of V and Nb, 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.
In above-mentioned chemical composition, 0.10%~0.60%Cr is the essential element for improving steel hardenability, and makes base steel table
Face forms the rusty scale of densification, slows down the corrosion of air or other corrosive mediums to weather-proof steel matrix, so as to improve weathering steel
Weatherability.Therefore add 0.10%~0.60%Cr and two beneficial effects are generated to construction(al)steel, be to add first
0.10%~0.60%Cr can make the centre grain size of the construction(al)steel of big specification reach unanimity in edge, secondly adding
The construction(al)steel of 0.10%~0.60%Cr, even if being stored in for a long time in open-air atmosphere, causes corrosion to lose weight by air
Quantity be also less than without Cr construction(al)steels.
Present invention also offers prepare above-mentioned V, Nb, Cr 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 becomes a useful person.In detail below
Narration 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, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.05%~0.15% C, P is no more than 0.025%, S is not more than 0.035%, and when tapping temperature is not less than 1650 DEG C taps
Into ladle.
The FeSi alloys containing Si elements, the FeMn alloys containing Mn elements, the conjunction containing V element are added in tapping process
Gold, the alloy containing Nb elements, the alloy containing Cr elements, and carbon dust or anthracite etc. increase C agent, control C 0.15%~
In the range of 0.30%, Si is controlled in the range of 0.30%~1.00%, and Mn is in the range of 0.60%~1.30% for control, controls Cr
In the range of 0.10%~0.60%, V is in the range of 0.010%~0.100% for control, and Nb is 0.010%~0.030% for control
In the range of.Require in addition that, FeSi, FeMn, FeCr, FeNb, FeV or VN alloy, and carbon dust are initially added into tapping 1/3
Or anthracite etc. increases C agent, 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 detects；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, which is by outbound temperature after above-mentioned converter tapping and stove
Degree controls to realize.
The steel billet section that molten steel is casting continuously to form be 150mm × 150mm~200mm × 200mm square billet, less than 150mm ×
The square billet section of 150mm is small to be unfavorable for working continuously for bof process, and the square billet section more than 200mm × 200mm can then extend
Heating time during follow-up rolling steel billet.
The steel billet that molten steel is casting continuously to form, naturally cools to room temperature in atmosphere.
5th step：Heating steel billet and rolling
Heating requirements total heating 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 spit 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 spat after silk pole wire rod steel or Ribbed Bar wire rod steel, first with the cooling velocity of 4 DEG C~8 DEG C/s
It is cooled in the range of 600 DEG C~700 DEG C, is then cooled to the cooling velocity of 2 DEG C~3 DEG C/s 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 the cooling velocity of 0.5 DEG C~1.0 DEG C/s, 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, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.09% C, 0.021% P, 0.026% S, tapping is into ladle when temperature is 1674 DEG C, and actual tap is at this time
132 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeV, FeNb alloy and anthracite carry out Si, Mn, Cr, V, Nb and C element alloying, wherein Si contents in the FeSi alloys added
It is that Cr contents are that V content is 78% in 54%, FeV alloys in 82%, FeCr alloys for Mn contents in 74%, FeMn alloys,
Nb contents are 65% in FeNb alloys, and C is fixed in anthracite as 92%, and to control in molten steel Si contents be 0.25%, Mn contents are
0.61%th, Cr contents are 0.10%, V content 0.010%, Nb contents are 0.010%, C content 0.15%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
4~5min of gas, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1577 DEG C
Cored wire, it is 0.0061% 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 to conticaster to cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1545 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, 0.32%
Si, 0.61% Mn, 0.10% Cr, 0.010% V, 0.010% Nb, 0.025% P, 0.022% S,
0.0064% N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to high-speed wire rolling production line and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 951 DEG C, and soaking temperature is 1001 DEG C, and total heating time, which reaches to come out of the stove after 116min, 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 spat after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with the cooling velocity of 4 DEG C/s
To 605 DEG C, 400 DEG C then are cooled to the cooling velocity of 2 DEG C/s, after being finally cooled to 150 DEG C with the cooling velocity of 1.0 DEG C/s
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 354MPa, tensile strength 481MPa, elongation are
35.1%th, maximum, force percentage of total elongation is 18.2%, 180 DEG C of clod wash qualification.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation process, the C of the chemical constituent 0.16% after preparation,
0.33% Si, 0.62% Mn, 0.010% V, 0.010% Nb, 0.028% P, 0.021% S, 0.0064%
N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel
Mechanical property is：ReL (Rp0.2) is 351MPa, tensile strength 476MPa, elongation 35.2%, maximum, force percentage of total elongation
For 19.0%, 180 DEG C of clod wash qualifications, the tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 1, the average weight-loss ratio of steel of the present invention is
2.508g/m2, the average weight-loss ratio of compared steel is 2.431g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
96.9%, corrosion test shows that steel of the present invention has certain corrosion resistance.
1 corrosion resisting property inspection result of table
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, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.11% C, 0.021% P, 0.029% S, tapping is into ladle when temperature is 1672 DEG C, and actual tap is at this time
133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeV alloys, FeNb and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that Cr contents are that V content is 78%, FeNb in 54%, FeV alloys in 82%, FeCr alloys in 74%, FeMn alloy
The content of Nb is 65% in alloy, and C is fixed in anthracite as 92%, and to control in molten steel Si contents be 0.95%, Mn contents are
1.28%th, Cr contents are 0.31%, V content 0.10%, Nb contents are 0.030%, 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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1581 DEG C
Cored wire, it is 0.0173% 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 to conticaster to cast.
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, 0.98%
Si, 1.26% Mn, 0.30% Cr, 0.10% V, 0.030% Nb, 0.028% P, 0.017% S, 0.0178%
N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to high-speed wire rolling production line and 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 heating 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 spat after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with the cooling velocity of 4 DEG C/s
To 605 DEG C, 400 DEG C then are cooled to the cooling velocity of 2 DEG C/s, after being finally cooled to 150 DEG C with the cooling velocity of 1.0 DEG C/s
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 537MPa, tensile strength 709MPa, elongation are
19.7%th, maximum, force percentage of total elongation is 11.8%, 180 DEG C of clod wash qualification.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation process, C that the chemical constituent after preparation is 0.30%,
0.95% Si, 1.29% Mn, 0.10% V, 0.030% Nb, 0.027% P, 0.021% S, 0.0179%
N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel
Mechanical property is：ReL (Rp0.2) is 516MPa, tensile strength 696MPa, elongation 21.1%, maximum, force percentage of total elongation
For 13.1%, 180 DEG C of clod wash qualifications, the tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 2, the average weight-loss ratio of steel of the present invention is
2.506g/m2, the average weight-loss ratio of compared steel is 2.320g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
92.6%, corrosion test shows that steel of the present invention has certain corrosion resistance.
2 corrosion resisting property inspection result of table
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, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.14% C, 0.020% P, 0.021% S, tapping is into ladle when temperature is 1675 DEG C, and actual tap is at this time
133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeV alloys, FeNb and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that Cr contents are that V content is 78%, FeNb in 54%, FeV alloys in 82%, FeCr alloys in 74%, FeMn alloy
The content of Nb is 65% in alloy, and C is fixed in anthracite as 92%, and to control in molten steel Si contents be 0.58%, Mn contents are
0.94%th, Cr contents are 0.54%, V content 0.065%, Nb contents are 0.025%, 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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1584 DEG C
Cored wire, it is 0.0127% 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 to conticaster to 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, 0.66%
Si, 0.94% Mn, 0.55% Cr, 0.065% V, 0.025% Nb, 0.024% P, 0.022% S,
0.0137% N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to high-speed wire rolling production line and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1217 DEG C, and soaking temperature is 1194 DEG C, and total heating time, which reaches to come out of the stove after 98min, 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 spat after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with the cooling velocity of 4 DEG C/s
To 605 DEG C, 400 DEG C then are cooled to the cooling velocity of 2 DEG C/s, after being finally cooled to 150 DEG C with the cooling velocity of 1.0 DEG C/s
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) be ReL (Rp0.2) be 491MPa, tensile strength be
672MPa, elongation 22.7%, maximum, force percentage of total elongation are 16.1%, 180 DEG C of clod wash qualification.The tissue of steel is ferrite
+ pearlite.
Using the compared steel of preparation identical with above-mentioned preparation process, C that the chemical constituent after preparation is 0.26%,
0.62% Si, 0.94% Mn, 0.065% V, 0.025% Nb, 0.024% P, 0.023% S, 0.03%
Cr, 0.0131% N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isBand rib steel
Muscle.Examine compared steel mechanical property be：ReL (Rp0.2) is 470MPa, tensile strength 651MPa, elongation 22.7%,
Maximum, force percentage of total elongation is 16.3%, and 180 DEG C of clod wash qualifications, the tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 3, the average weight-loss ratio of steel of the present invention is
2.501g/m2, the average weight-loss ratio of compared steel is 2.322g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
92.8%, corrosion test shows that steel of the present invention has certain corrosion resistance.
3 corrosion resisting property inspection result of table
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, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.06% C, 0.022% P, 0.019% S, tapping is into ladle when temperature is 1677 DEG C, and actual tap is at this time
136 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeV, FeNb alloy and anthracite carry out Si, Mn, Cr, V, Nb and C element alloying, wherein Si contents in the FeSi alloys added
It is that Cr contents are that V content is 78% in 54%, FeV alloys in 82%, FeCr alloys for Mn contents in 74%, FeMn alloys,
Nb contents are 65% in FeNb alloys, and C is fixed in anthracite as 92%, and to control in molten steel Si contents be 0.54%, Mn contents are
0.96%th, Cr contents are 0.41%, V content 0.030%, Nb contents are 0.015%, 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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1581 DEG C
Cored wire, it is 0.099% 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 to conticaster to 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 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.64%
Si, 0.96% Mn, 0.41% Cr, 0.030% V, 0.015% Nb, 0.026% P, 0.023% S,
0.0101% N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to high-speed wire rolling production line and heated, rolled, rolling specs arePole
Reinforcing bar.Slab heating temperature is 1151 DEG C, and soaking temperature is 1098 DEG C, and total heating time, which reaches to come out of the stove after 109min, 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 spat after silk pole wire rod steel or pole wire roll steel, cooled down first with the cooling velocity of 4 DEG C/s
To 605 DEG C, 400 DEG C then are cooled to the cooling velocity of 2 DEG C/s, after being finally cooled to 150 DEG C with the cooling velocity of 1.0 DEG C/s
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) be ReL (Rp0.2) be 441MPa, tensile strength be
620MPa, elongation 28.2%, maximum, force percentage of total elongation are 17.4%, 180 DEG C of clod wash qualification.The tissue of steel is ferrite
+ pearlite.
Using the compared steel of preparation identical with above-mentioned preparation process, C that the chemical constituent after preparation is 0.15%,
0.65% Si, 0.98% Mn, 0.030% V, 0.015 Nb, 0.028% P, 0.019% S, 0.0099% N,
0.03% Cr, remaining is Fe and inevitable other impurity, and specification isPole reinforcing bar.Examine the power of compared steel
Learning performance is：ReL (Rp0.2) is 432MPa, tensile strength 608MPa, elongation 27.5%, and maximum, force percentage of total elongation is
16.2%, 180 DEG C of clod wash qualifications, the tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 4, the average weight-loss ratio of steel of the present invention is
2.497g/m2, the average weight-loss ratio of compared steel is 2.368g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
94.8%, corrosion test shows that steel of the present invention has certain corrosion resistance.
4 corrosion resisting property inspection result of table
Claims (9)
1. containing V, Nb, Cr 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%, Cr：0.10~0.60%, surplus is for Fe and unavoidably
Impurity.
2. the LF stove production methods of the building steel wire rod containing V, Nb, Cr 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 component：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%, Cr：
0.10~0.60%, 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；Laying head in the high-speed rod-rolling mill
Process, it is 880~960 DEG C to control laying temperature；It is described be cooled to be cooled to 600 first with the cooling velocity of 4~8 DEG C/s~
700 DEG C, 400~500 DEG C then are cooled to the cooling velocity of 2~3 DEG C/s, it is finally cold with the cooling velocity of 0.5~1.0 DEG C/s
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, Cr 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%, whens liquid steel temperature >=1650 DEG C, tap；
During tapping 1/3~2/3, FeSi, FeMn, FeCr, 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%, Cr be 0.10~
0.60%th, Nb is 0.010~0.030%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；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 ×
The square billet of 150mm~200mm × 200mm, is air-cooled to room temperature；
D, heating steel billet and rolling：Billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200
DEG C, heating and 90~120min of soaking total time, pole wire rod or screw wire rod, rolling knot are rolled into using high-speed rod-rolling mill
Beam postcooling is up to 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 the cooling velocity of 4~8 DEG C/s, then with the cooling speed of 2~3 DEG C/s
Degree is cooled to 400~500 DEG C, is finally cooled to 150~300 DEG C with the cooling velocity of 0.5~1.0 DEG C/s.
4. the LF stove production methods of the building steel wire rod according to claim 3 containing V, Nb, Cr 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, Cr 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, Cr microalloy, it is characterised in that：
In step b, the 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, Cr 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, Cr microalloy, it is characterised in that：
In step 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, Cr 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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