CN107955916A - Microalloy containing Ti builds steel wire rod and its LF stove production methods - Google Patents
Microalloy containing Ti builds steel wire rod and its LF stove production methods Download PDFInfo
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- CN107955916A CN107955916A CN201711242251.0A CN201711242251A CN107955916A CN 107955916 A CN107955916 A CN 107955916A CN 201711242251 A CN201711242251 A CN 201711242251A CN 107955916 A CN107955916 A CN 107955916A
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to field of steel metallurgy, and in particular to a kind of building steel wire rod of microalloy containing Ti 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 present invention provides a kind of building steel wire rod of microalloy containing Ti 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%, Ti：0.010~0.050%, 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 a kind of the building steel wire rod of microalloy containing Ti 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 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 building of microalloy containing Ti steel wire rod.It is micro- that this contains Ti
Alloy 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%, Ti：0.010~0.050%, surplus
For Fe and inevitable impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building of microalloy containing Ti 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 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%, Ti：0.010~0.050%, surplus for Fe and
Inevitable impurity；The 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；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.
Further, the LF stove production methods of the above-mentioned building of microalloy containing Ti 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%, whens liquid steel temperature >=1650 DEG C taps；
During tapping 1/3~2/3, FeSi and FeMn alloys are added, and increase C agent, to control C be 0.15~0.30%, Si is
0.30~1.00%, Mn is 0.60~1.30%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；
After steel ladle reaches LF stoves, FeTi alloys are added, it is 0.010~0.050% to control Ti, adds core-spun yarn containing N, is controlled in molten steel
N content is 0.0060~0.0180%；
C, continuous casting：It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the steel billet section that molten steel is casting continuously to form is 150mm
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 of microalloy containing Ti steel wire rod, molten iron described in step a requires S to contain
Amount≤0.06%.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing Ti 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 Ti 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 Ti 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 Ti steel wire rod, step b electrical heating temperatures are higher than liquid phase
60~90 DEG C of line temperature.
Wherein, in the LF stove production methods of above-mentioned microalloy containing Ti 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 Ti by designing a kind of microalloy building iron containing Ti in steel：0.010~
0.050%, 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 Ti that intensity is high, nitrogen recovery rate is high, function admirable.The method of the present invention is easy to operate, nitrogen recovery rate it is high and
Stablize, moreover it is possible to effectively reduce production cost, be worth of widely use.
Embodiment
The present invention provides a kind of building of microalloy containing Ti 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%, Ti：0.010%~0.050%, surplus is Fe and inevitable impurity.
In above-mentioned chemical composition, containing 0.0060%~0.0180% nitrogen in steel, using 0.010%~0.050%Ti
To being fixed, to ensure the aging performance of steel.Use converter process smelting steel under normal circumstances, the residual nitrogen in final finished steel
Content is in the range of 0.0030%~0.0065%, using electric furnace smelting steel, residual nitrogen content then 0.0050%~
In the range of 0.0085%.Higher nitrogen content, timeliness are deteriorated therewith in steel, therefore, when nitrogen content be higher than 0.006%, and with
The increase of nitrogen content, it is necessary to add suitable nitrogen killer and fixed, of the invention then use addition 0.010%~0.050%
The mode of Ti, to ensure the timeliness of steel, while can also give full play to the solution strengthening effect of nitrogen, so as to improve the strong of steel
Degree, 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, the addition of titanium
It is more prone to form Ti (C, N) particle, so as to promote the precipitation of Ti, can more fully plays the precipitation strength and crystalline substance of Ti
Grain refining effect, to improve the comprehensive mechanical property of steel.
Present invention also offers prepare above-mentioned Ti microalloys 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.Describe this in detail below
Invention bof process technology：
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 are no more than 0.025%, S is not more than 0.035%, and when tapping temperature is not less than 1650 DEG C taps
Into ladle.
The FeSi alloys containing Si elements, the FeMn alloys containing Mn elements, and carbon dust or nothing are added in tapping process
Bituminous coal etc. increases C agent, controls C in the range of 0.15%~0.30%, controls Si in the range of 0.30%~1.00%, control Mn exists
In the range of 0.60%~1.30%.Require in addition that, FeSi, FeMn alloy and and carbon dust or nothing are initially added into tapping 1/3
Bituminous coal etc. increases 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.
Thermometric is carried out before outbound, it is ensured that out-station temperature is higher than 60~90 DEG C of the liquidus temperature of steel.
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, and adds FeTi alloys, control Ti 0.010%~
In the range of 0.050%；Core-spun yarn containing N is then added using the method for line feeding according to the testing result of N content in molten steel, controls steel
N content is in the range of 0.0060%~0.0180% in liquid, can if N content control is relatively stable in molten steel after LF stove heats
Do not sample and carry out N content detection, be fed directly into core-spun yarn.The core-spun yarn is nitrogen-containing alloy, such as SiN.
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into ability after inert gas
The core-spun yarn containing N is fed, inert gas can be argon gas or nitrogen, when being blown into inert gas after the completion of line feeding
Between also need extend 2min, to ensure the uniformity of Ti and N element in molten steel.
4th step：It is casting continuously to form steel billet
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, 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 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
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1658 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 alloy and
Anthracite carries out Si, Mn and C element alloying, wherein Si contents are that Mn contains in 74%, FeMn alloys in the FeSi alloys added
Measure as 82%, C is fixed in anthracite as 92%, control in molten steel that Si contents are 0.28%, Mn contents are 0.59%, C content is
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 liquid steel temperature adds FeTi alloys when reaching 1667 DEG C, controls in firm water
Ti contents are 40% in 0.011% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, is controlled in molten steel
N content is 0.0062%.
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen, when line feeding is completed
Extend afterwards and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Molten steel then is sent to conticaster to be poured
Casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1547 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.31%
Si, 0.60% Mn, 0.010% Ti, 0.026% P, 0.020% S, 0.0062% N, 0.03% Cr, 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 958 DEG C, and soaking temperature is 1000 DEG C, and total heating time, which reaches to come out of the stove after 120min, 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 315MPa, tensile strength 475MPa, and elongation is
36.0%, maximum, force percentage of total elongation is 19.0%, and 180 DEG C of clod wash qualifications, 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, 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
0.12% C, 0.022% P, 0.021% S, tapping is into ladle when temperature is 1661 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 alloy and
Anthracite carries out Si, Mn and C element alloying, wherein Si contents are that Mn contains in 74%, FeMn alloys in the FeSi alloys added
Measure as 82%, C is fixed in anthracite as 92%, control in molten steel that Si contents are 0.92%, Mn contents are 1.27%, C content is
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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1668 DEG C, controls in firm water
Ti contents are 40% in 0.049% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, is controlled in molten steel
N content is 0.0173%.
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen, when line feeding is completed
Extend afterwards and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Molten steel then is sent to conticaster to be poured
Casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1531 DEG C during continuous casting,
The liquidus temperature of steel is 1495 DEG C, bag sampling analysis molten steel chemical constituent is 0.29% in conticaster C, 0.96%
Si, 1.30% Mn, 0.050% Ti, 0.027% P, 0.023% S, 0.0177% N, 0.03% Cr, 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 areBand
Rib reinforcement.Slab heating temperature is 954 DEG C, and soaking temperature is 1004 DEG C, and total heating time, which reaches to come out of the stove after 118min, 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 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 314MPa, tensile strength 477MPa, and elongation is
36.1%, maximum, force percentage of total elongation is 19.3%, and 180 DEG C of clod wash qualifications, the tissue of steel is ferrite+pearlite.
Embodiment 3
Certain steel plant is on 120 tons of (actual tap is in the range of 120~140 tons) bof processes of nominal capacity using this
Inventive technique produces Ribbed Bar for building, and production technology is to be blown into inert gas → LF stove heat → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 200mm × 200mm steel billets → heating steel billet → high-speed wire rolling intoBand rib steel
Muscle.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.08% C, 0.021% P, 0.020% S, tapping is into ladle when temperature is 1673 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 alloy and
Anthracite carries out Si, Mn and C element alloying, wherein Si contents are that Mn contains in 74%, FeMn alloys in the FeSi alloys added
Measure as 82%, C is fixed in anthracite as 92%, it is that 0.58%, Mn contents are 0.97% to control Si contents in molten steel, and C content is
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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1671 DEG C, controls in firm water
Ti contents are 40% in 0.031% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, is controlled in molten steel
N content is 0.0106%.
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen, when line feeding is completed
Extend afterwards and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Molten steel then is sent to conticaster to be poured
Casting.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1546 DEG C during continuous casting,
The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.20% in conticaster C, 0.65%
Si, 0.98% Mn, 0.030% Ti, 0.024% P, 0.023% S, 0.0110% N, 0.03% Cr, remaining is
Fe and inevitable other impurity, 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 1125 DEG C, and soaking temperature is 1052 DEG C, and total heating time, which reaches to come out of the stove after 106min, is rolled
System,
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 920 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has spat after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with the cooling velocity of 6 DEG C/s
To 695 DEG C, 500 DEG C then are cooled to the cooling velocity of 2.5 DEG C/s, is finally cooled to 300 with the cooling velocity of 0.75 DEG C/s
The collection collection volume of steel is carried out after DEG C, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 426MPa, tensile strength 587MPa, and elongation is
22.1%, maximum, force percentage of total elongation is 16.2%, and 180 DEG C of clod wash qualifications, 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 for building, and production technology is to be blown into the machine 6 of inert gas → LF stove heats → 6 after converter smelting → stove to flow
Billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoPole.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.08% C, 0.019% P, 0.020% S, tapping is into ladle when temperature is 1681 DEG C 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 alloy and
Anthracite carries out Si, Mn and C element alloying, wherein Si contents are that Mn contains in 74%, FeMn alloys in the FeSi alloys added
Measure as 82%, C is fixed in anthracite as 92%, it is that 0.58%, Mn contents are 0.97% to control Si contents in molten steel, and C content is
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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1672 DEG C, controls in firm water
Ti contents are 40% in 0.020% Ti, FeTi alloy.Core-spun yarn containing N is then added using the method for line feeding, is controlled in molten steel
N content is 0.0102%.
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen, when line feeding is completed
Extend afterwards and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Molten steel then is sent to conticaster to be poured
Casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1536 DEG C during continuous casting,
The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.19% in conticaster C, 0.64%
Si, 0.73% Mn, 0.021% Ti, 0.023% P, 0.022% S, 0.0099% N, 0.03% Cr, 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 1148 DEG C, and soaking temperature is 1060 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 910 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 5 DEG C/s
To 680 DEG C, 460 DEG C then are cooled to the cooling velocity of 2.5 DEG C/s, is finally cooled to 250 with the cooling velocity of 0.75 DEG C/s
The collection collection volume of steel is carried out after DEG C, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 424MPa, tensile strength 579MPa, and elongation is
24.2%, maximum, force percentage of total elongation is 16.8%, and 180 DEG C of clod wash qualifications, the tissue of steel is ferrite+pearlite.
Claims (9)
1. microalloy containing Ti 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, Ti：0.010~0.050%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building steel wire rod of microalloy containing Ti 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 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%, Ti：0.010~0.050%, 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 the cooling velocity of 4~8 DEG C/s, is then cooled to the cooling velocity of 2~3 DEG C/s
400~500 DEG C, finally 150~300 DEG C are cooled to the cooling velocity of 0.5~1.0 DEG C/s.
3. the LF stove production methods of the building of microalloy containing Ti 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%, whens liquid steel temperature >=1650 DEG C, tap；
During tapping 1/3~2/3, FeSi and FeMn alloys are added, and increase C agent, to control C be 0.15~0.30%, Si 0.30
~1.00%, Mn is 0.60~1.30%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；Molten steel
After bag reaches LF stoves, FeTi alloys are added, it is 0.010~0.050% to control Ti, adds core-spun yarn containing N, controls N in molten steel to contain
Measure as 0.0060~0.0180%；
C, continuous casting：It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, by molten steel be casting continuously to form steel billet section for 150mm ×
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 of microalloy containing Ti 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 Ti 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 Ti steel wire rod according to claim 3, it is characterised in that：Step b
In, the inert gas is at least one of argon gas or nitrogen.
7. the LF stove production methods of the building of microalloy containing Ti 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 Ti 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 Ti 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 |
|---|---|---|---|---|
| CN110106446A (en) * | 2019-06-24 | 2019-08-09 | 新余钢铁股份有限公司 | A kind of 400MPa grades of hot rolled ribbed bars containing Ti and its production technology |
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2017
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| JPS5443822A (en) * | 1977-09-14 | 1979-04-06 | Nippon Steel Corp | Manufacture of high tensile hot rolled steel sheet with low intrafacial plastic anisotropy |
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| CN110106446A (en) * | 2019-06-24 | 2019-08-09 | 新余钢铁股份有限公司 | A kind of 400MPa grades of hot rolled ribbed bars containing Ti and its production technology |
| CN110106446B (en) * | 2019-06-24 | 2021-04-13 | 新余钢铁股份有限公司 | 400 MPa-grade Ti-containing hot-rolled ribbed steel bar and production process thereof |
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