CN107955908A - Microalloy containing Nb builds steel wire rod and its LF stove production methods - Google Patents
Microalloy containing Nb builds steel wire rod and its LF stove production methods Download PDFInfo
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- CN107955908A CN107955908A CN201711242337.3A CN201711242337A CN107955908A CN 107955908 A CN107955908 A CN 107955908A CN 201711242337 A CN201711242337 A CN 201711242337A CN 107955908 A CN107955908 A CN 107955908A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to field of steel metallurgy, and in particular to a kind of building steel wire rod of microalloy containing Nb 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 Nb 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%, Nb：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 Nb 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 in most cases will such as give full play to the effect of vanadium, niobium and titanium, be to have to volume in the range of 0.050%~0.085%
It is outer to add what nitrogen be realized.
Early stage increases nitrogen in micro alloyed steel, is realized by the nitridation class alloy of addition 3%~6%, but due to
It is nitrogenous very low to nitrogenize class alloy, causes alloy addition big, and recovery rate is unstable, is gradually closed by the higher vanadium nitride of nitrogen content
Jin Dynasty is replaced.At present almost it is difficult to reuse 3%~6% nitridation class alloy, almost all was using both in the production of micro alloyed steel
Containing vanadium and nitrogen content and high alloy of vanadium nitride.Alloy of vanadium nitride mainly has tri- trades mark of VN12, VN14 and VN16.Ordinary circumstance
The ratio of lower three trade mark nitrogen and vanadium 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 height of preparation, cost are low.
First technical problem to be solved by this invention is to provide a kind of building of microalloy containing Nb steel wire rod.The wire rod contains
The chemical composition of Nb microalloy building irons 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%, Nb：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 Nb steel wire rod.The production method bag
Include 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%, Nb：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 Nb 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；
Tapping 1/3~2/3 when, add FeSi, FeMn and FeNb alloy, and increase C agent, control C be 0.15~0.30%,
Si is 0.30~1.00%, Mn is 0.60~1.30%, Nb is 0.010~0.050%；
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, 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, 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 Nb 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 Nb 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 Nb 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 Nb 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 Nbr steel wire rod, step b out-station temperatures are higher than steel
60~90 DEG C of liquidus temperature.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing Nb steel wire rod, pole wire rod or spiral shell described in step d
The specification of line wire rod is
The present invention adds alloying component Nb by designing a kind of microalloy building iron containing Nb 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 Nb 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 Nb 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%, S
≤ 0.040%, Nb：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%Nb
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 Nb, 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 niobium
It is more prone to form Nb (C, N) particle, so as to promote the precipitation of niobium, can more fully plays the precipitation strength and crystalline substance of niobium
Grain refining effect, to improve the comprehensive mechanical property of steel.
In order to ensure that the mechanical property present invention adds Nb, and it is in order to while performance is improved to add N, additionally it is possible to more
The invigoration effect of Nb is given full play to, to reduce the alloying cost of Nb, the addition of Nb can also be reduced after addition N.
Present invention also offers prepare above-mentioned Nb 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 are added in tapping process, the FeMn alloys containing Mn elements, contain Nb elements
Alloy, and carbon dust or anthracite etc. increase C agent, control C is in the range of 0.15%~0.30%, control Si 0.30%~
In the range of 1.00%, Mn is in the range of 0.60%~1.30% for control, and Nb is in the range of 0.010%~0.050% for control.In addition
It is required that being initially added into FeSi, FeMn, FeNb alloy and carbon dust or anthracite etc. in tapping 1/3 increases C agent, must when tapping to 2/3
It must 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, and is 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 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
0.10% C, 0.022% P, 0.025% S, tapping is into ladle when temperature is 1676 DEG C, and actual tap is at this time
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.28%th, Mn contents are 0.62%, Nb contents are 0.010%, 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 1578 DEG C
Cored wire, it is 0.0062% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent to conticaster to cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1544 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, and bag sampling analysis molten steel chemical constituent is the bag sampling analysis in conticaster in conticaster
Molten steel chemical constituent is 0.16% C, 0.32% Si, 0.61% Mn, 0.010% Nb, 0.026% P, 0.020%
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 958 DEG C, and soaking temperature is 1006 DEG C, and total heating time, which reaches to come out of the stove after 117min, 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 346MPa, tensile strength 478MPa, and elongation is
35.9%, maximum, force percentage of total elongation is 18.1%, 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
0.06% C, 0.018% P, 0.022% S, tapping is into ladle when temperature is 1683 DEG C, and actual tap is at this time
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.92%, Mn content are that 1.29%, Nb contents are 0.050%, 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, 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 0.0168% 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 1495 DEG C, bag sampling analysis molten steel chemical constituent is 0.29% in conticaster C, 0.97%
Si, 1.30% Mn, 0.049% Nb, 0.022% P, 0.018% S, 0.0178% N, remaining is Fe and can not keep away
The other impurity exempted from.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 956 DEG C, and soaking temperature is 1002 DEG C, and total heating time, which reaches to come out of the stove after 115min, 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 504MPa, tensile strength 682MPa, and elongation is
18.8%, maximum, force percentage of total elongation is 11.1%, 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 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, 0.022% P, 0.024% S, tapping is into ladle when temperature is 1678 DEG C, and actual tap is at this time
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.61%, Mn content are that 0.98%, Nb contents are 0.024%, 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, 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 1586 DEG C
Cored wire, it is 0.0122% 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 0.23% in conticaster C, 0.63%
Si, 1.03% Mn, 0.025% Nb, 0.028% P, 0.019% S, 0.0121% N, remaining is Fe and can not keep away
The other impurity exempted from.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 1125 DEG C, and soaking temperature is 1072 DEG C, and total heating 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 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 429MPa, tensile strength 591MPa, and elongation is
21.2%, maximum, force percentage of total elongation is 15.3%, 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 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
0.05% C, 0.021% P, 0.022% S, tapping is into ladle when temperature is 1683 DEG C, and actual tap is at this time
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.59%, Mn content are that 0.88%, Nb contents are 0.015%, C content 0.20%.
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 1580 DEG C
Cored wire, it is 0.0103% 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 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, remaining is for Fe and unavoidably
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 areCircle
Bar reinforcement.Slab heating temperature is 1154 DEG C, and soaking temperature is 1101 DEG C, and total heating time, which reaches to come out of the stove after 99min, 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 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) is 422MPa, tensile strength 591MPa, and elongation is
26.3%, maximum, force percentage of total elongation is 17.1%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Claims (9)
1. microalloy containing Nb 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, Nb：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 Nb 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%, Nb：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 Nb 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, FeMn and FeNb alloy are added, and increases C agent, to control C be 0.15~0.30%, Si is
0.30~1.00%, Mn be 0.60~1.30%, Nb be 0.010~0.050%；
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 of microalloy containing Nb 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 Nb 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 Nb 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 Nb 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 Nb 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 Nb 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 |
|---|---|---|---|---|
| CN113652601A (en) * | 2021-07-06 | 2021-11-16 | 广西柳钢华创科技研发有限公司 | High-speed wire threaded steel with small strength fluctuation difference in same circle and surface oxidized iron sheet thickness of more than 10 mu m and production method thereof |
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| CN113652601A (en) * | 2021-07-06 | 2021-11-16 | 广西柳钢华创科技研发有限公司 | High-speed wire threaded steel with small strength fluctuation difference in same circle and surface oxidized iron sheet thickness of more than 10 mu m and production method thereof |
| CN113652601B (en) * | 2021-07-06 | 2022-11-29 | 广西柳钢华创科技研发有限公司 | High-speed wire threaded steel with small intensity fluctuation difference and surface iron scale thickness of more than 10 mu m in same circle and production method thereof |
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Application publication date: 20180424 |