CN107747048A - Steel wire rod and its production method are built containing V, Nb, Ti, Cr microalloy - Google Patents
Steel wire rod and its production method are built containing V, Nb, Ti, Cr microalloy Download PDFInfo
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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
- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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Abstract
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb, Ti, Cr microalloy building steel wire rod and its production method.The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, the invention provides one kind containing V, Nb, Ti, Cr microalloy building steel wire rod and its production method.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：0.010~0.080%, Nb：0.010~0.030%, Ti：0.010~0.030%, Cr：0.10%~0.60%, surplus is Fe and inevitable impurity.The key of its preparation method is that after stove chain-wales feed core-spun yarn containing N, adjustment N to suitable level.The inventive method is simple to operate, and nitrogen recovery rate is high and stably, moreover it is possible to effectively reduces production cost, is worth of widely use.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb, Ti, Cr microalloy building steel wire rod and its life
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 generally to add minimal amount for micro alloyed steel under the conditions of prior art
Measure vanadium, niobium and titanium and obtain.The mechanism of action of microalloying is：After vanadium, niobium and titanium as trace element add molten steel, with steel
Carbon and nitrogen in liquid combine, and form carbon, nitrogen compound particle, i.e. V (C, N), Nb (C, N) and Ti (C, N) particle, these particles
There is certain precipitation strength and crystal grain refinement, the intensity of steel can be significantly improved.
It will thus be seen that the effect of 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 be substantially stationary, respectively 12 ︰ 78,14 ︰ 78,16 ︰ 78, i.e. nitrogen and vanadium ratio most
A height of VN16 16 ︰ 78, i.e., containing 16% N in alloy, contain 78% vanadium.Although alloy of vanadium nitride both contains vanadium and nitrogen content
It is again high, but for micro-alloying technology route different in micro alloyed steel, particularly composite micro-alloyed steel, such as V-Ti-N, very
As for V-Ti-Nb-N, and it is unable to meet demand.
The content of the invention
The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, and the present invention carries
A kind of new method for preparing nitrogen-containing alloy is supplied.This method adjusts nitrogen content in microalloy, energy using nitrogenous core-spun yarn is added
Enough N contents being more accurately controlled in steel, the micro alloyed steel nitrogen recovery rate of preparation is high, and cost is low.
First technical problem to be solved by this invention is to provide a kind of containing V, Nb, Ti, Cr microalloy building steel wire rod.
This containing V, Nb, Ti, Cr microalloy building steel wire rod chemical composition be：By weight percentage, C：0.15~0.30%, Si：
0.30~1.00%, Mn：0.60~1.30%, N：0.0060~0.0180%, P≤0.040%, S≤0.040%, V：0.010
~0.080%, Nb：0.010~0.030%, Ti：0.010~0.030%, Cr：0.10%~0.60%, surplus is for Fe and not
Evitable impurity.
Present invention also offers a kind of production method of the above-mentioned building steel wire rod containing V, Nb, Ti, Cr microalloy.The producer
Method comprises the following steps：
It is blast-melted that steel billet is made through converter smelting, continuous casting；Steel billet is heated, high-speed rod-rolling mill carry out rolling become a useful person,
Pole wire rod or screw wire rod is made in cooling；Wherein, core-spun yarn adjustment N content is fed in the ladle of chain-wales after stove；It is described
Steel billet composition is C by weight percentage：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：0.010~0.080%, Nb：0.010~0.030%, Ti：
0.010~0.030%, Cr：0.10%~0.60%, surplus is Fe and inevitable impurity；The billet heating temperature control
950~1220 DEG C are made as, soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；The height
Laying head process in fast rod-rolling mill, it is 880~960 DEG C to control laying temperature；It is described to be cooled to first with 4~8 DEG C/s's
Cooling velocity is cooled to 600~700 DEG C, is then cooled to 400~500 DEG C with 2~3 DEG C/s cooling velocity, finally with 0.5~
1.0 DEG C/s cooling velocity is cooled to 150~300 DEG C.
Further, the production method of the above-mentioned building steel wire rod containing V, Nb, Ti, Cr microalloy, comprises the following steps：
A, converter smelting：Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat that molten steel C contains
Measure as 0.05~0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
During tapping 1/3~2/3, FeSi, FeMn, FeCr, FeNb, FeTi and FeV or VN alloys are added, and increases C agent, control
C processed is 0.15~0.30%, Si is 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010~0.080%, Cr is
0.10%~0.60%, Ti be 0.010~0.030%, Nb be 0.010~0.030%；
B, core-spun yarn is fed：Chain-wales ladle after stove is transferred to after tapping, inert gas is blown into ladle, adds cored containing N
Line, it is 0.0060~0.0180% to control N content in molten steel；
C, continuous casting：It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the steel billet section that molten steel is casting continuously to form is 150mm
× 150mm~200mm × 200mm square billet, is air-cooled to room temperature；
D, heating steel billet and rolling：Billet heating temperature control is 950~1220 DEG C, soaking temperature control for 1000~
1200 DEG C, heating with 90~120min of soaking total time, pole wire rod or screw wire rod are rolled into using high-speed rod-rolling mill, rolled
System cools down after terminating and produces product；Wherein, the Laying head process in the high-speed rod-rolling mill, control laying temperature for 880~
960℃；It is described to be cooled to be cooled to 600~700 DEG C first with 4~8 DEG C/s cooling velocity, then with 2~3 DEG C/s cooling
Speed is cooled to 400~500 DEG C, is finally cooled to 150~300 DEG C with 0.5~1.0 DEG C/s cooling velocity.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb, Ti, Cr microalloy, the requirement of molten iron described in step a
S content≤0.06%.
Wherein, it is above-mentioned containing V, Nb, Ti, Cr microalloy building steel wire rod production method in, FeSi described in step a and
FeMn alloys FeSiMn alloy replacings.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb, Ti, Cr microalloy, the indifferent gas described in step b
Body is at least one of argon gas or nitrogen.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb, Ti, Cr microalloy, inertia is blown into described in step b
The time of gas >=2min.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb, Ti, Cr microalloy, step b out-station temperatures are higher than steel
60~90 DEG C of liquidus temperature.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb, Ti, Cr microalloy, pole wire rod described in step d
Or the specification of screw wire rod for building is
The present invention adds alloying component V by designing a kind of microalloy building iron containing V, Nb, Ti, Cr in steel：
0.010~0.080%, Cr：0.10%~0.60%, Ti：0.010~0.030%, Nb：0.010~0.030%, then coordinate and adopt
Mode used in chain-wales feeding core-spun yarn containing N after converter smelting stove adjusts N content in steel, and coordinates and produced using high speed wire rolling
Line rolls, and controls the parameters such as suitable laying temperature and cooldown rate, and a kind of intensity height, nitrogen recovery rate can finally be prepared
The high microalloy building iron containing V, Nb, Ti, Cr, function admirable.The inventive method is simple to operate, and nitrogen recovery rate is high and stably, also
Production cost can be effectively reduced, is worth of widely use.
Embodiment
It is containing V, Nb, Ti, Cr microalloy building steel wire rod, its chemical composition the invention provides one kind：Percentage by weight
Than meter, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N：0.0060%~
0.0180%th, P≤0.040%, S≤0.040%, V：0.010%~0.080%, Nb：0.010%~0.030%, Ti：
0.010%~0.030%, Cr:0.10%~0.60%, surplus is Fe and inevitable impurity.
In above-mentioned chemical composition, V is added：0.010%~0.080%, Nb：0.010%~0.030%, Ti：0.010%
~0.030% to being fixed, to ensure the aging performance of steel.Generally use converter process smelting steel, final finished steel
In residual nitrogen content in the range of 0.0030%~0.0065%, using electric furnace smelting steel, residual nitrogen content then exists
In the range of 0.0050%~0.0085%.Higher nitrogen content, ageing to be deteriorated therewith in steel, therefore when nitrogen content is higher than
0.0060%, and with the increase of nitrogen content, it is necessary to add appropriate nitrogen killer and fixed, of the invention then use adds
0.010%~0.080%V, 0.010%~0.030%Nb and 0.010%~0.030%Ti mode, with ensure steel when
Effect property, while the solution strengthening effect of nitrogen can also be given full play to, so as to improve the intensity of steel, reduce 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, niobium and titanium
Addition be also more prone to form V (C, N), Nb (C, N) and Ti (C, N) particle, can so as to promote V, Nb and Ti precipitation
Vanadium, niobium and Ti precipitation strength and Grain Refinement Effect are more fully played, to improve the comprehensive mechanical property of steel, equal
On the premise of mechanical property, the usage amount of vanadium, niobium and titanium 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 be reached unanimity in edge, next to that adding
0.10%~0.60%Cr construction(al)steel, even if being stored in for a long time in open-air atmosphere, corrosion is caused to lose weight by air
Quantity be also less than without Cr construction(al)steels.
Present invention also offers prepare above-mentioned V, Nb, Ti, Cr microalloy building steel wire rod bof process technique：Converter smelting
Inert gas+feeding core-spun yarn → is blown into after → stove it is casting continuously to form steel billet → heating steel billet → high-speed wire rolling production line and is rolled into
Material.Bof process technology of the present invention is described in detail below：
The first step：Converter smelting
Molten iron and steel scrap are added first in converter, it is desirable to which the molten iron S contents of addition are not more than 0.060%.Molten iron and useless
After steel adds converter, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.05%~0.15% C, P is no more than 0.025%, S is not more than 0.035%, and taps when tapping temperature is not less than 1650 DEG C
Into ladle.
The FeSi alloys containing Si elements, the FeMn alloys containing Mn elements, the conjunction containing V element are added in tapping process
Gold, the alloy containing Nb elements, the alloy containing Ti 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%~0.080% for control, and Nb is 0.010%~0.030% for control
In the range of, Ti is in the range of 0.010%~0.030% for control.Require in addition that, tap 1/3 when be initially added into FeSi, FeMn,
FeCr, FeNb, FeTi and FeV or VN alloys, carbon dust or anthracite etc. increase C agent, and tapping to when 2/3 to add.
In the addition of above-mentioned alloy, also FeSi and FeMn alloys can be replaced using the FeSiMn alloys containing Si and Mn.
Second step：Inert gas is blown into after Converter and feeds core-spun yarn
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, and control outbound liquid steel temperature.
The inert gas time is blown into more than after 2min, sampling carries out N content detection, and the side of line feeding is used according to assay
Method adds core-spun yarn containing N, and N content is in the range of 0.0060%~0.0180% in control molten steel, if N content in molten steel after stove
Control relatively stable can not sample to carry out N content detection, be fed directly into core-spun yarn.If foregoing carry out V using VN alloys
Alloying, the nitrogen content in molten steel can increase therewith, and now, the core-spun yarn containing N of feeding need to suitably reduce feed quantity, it is ensured that steel
N content is in the range of 0.0060%~0.0180% in liquid.Described core-spun yarn containing N 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 after the inert gas being blown into
The core-spun yarn containing N can be fed, inert gas can be argon gas or nitrogen, and inert gas is blown into after the completion of line feeding
Time also needs to extend 2min, to ensure the uniformity of N element in molten steel.
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：It is casting continuously to form steel billet
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the temperature is by outbound temperature after above-mentioned converter tapping and stove
Degree controls to realize.
The steel billet section that molten steel is casting continuously to form be 150mm × 150mm~200mm × 200mm square billet, less than 150mm ×
150mm square billet section is small to be unfavorable for working continuously for bof process, and the square billet section more than 200mm × 200mm can then extend
Heat time during follow-up rolling steel billet.
The steel billet that molten steel is casting continuously to form, naturally cools to room temperature in atmosphere.
4th step：Heating steel billet and rolling
Heating requirements total heat time of steel billet is 90~120min, and billet heating temperature control is 950~1220 DEG C,
Hot temperature control is 1000~1200 DEG C.
Roughing temperature, entry temperature at finishing in the high-speed rod-rolling mill operation of rolling, exit temperature at finishing, deflection, roll
The inferior parameter in road processed can be set out, but it has to be ensured that finally tell according to appointed condition and rolling speed using routine techniques
The laying temperature of silk machine spinning process, the pole wire rod steel to be spued or Ribbed Bar wire rod steel is controlled in 880~960 DEG C of scopes
It is interior.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, first with 4 DEG C~8 DEG C/s cooling velocity
It is cooled in the range of 600 DEG C~700 DEG C, is then cooled to 2 DEG C~3 DEG C/s cooling velocity in the range of 400 DEG C~500 DEG C,
The collection collection volume that steel is carried out after 150 DEG C~300 DEG C scopes is finally cooled to 0.5 DEG C~1.0 DEG C/s cooling velocity, is finally used
Steel band or steel wire bundling are into the finished product wire rod steel for being readily transported and selling.
Finally illustrate：Final diameter isPole wire rod, or have and GB
The Ribbed Bar of defined is a diameter of in 1499.2Construction(al)steel wire rod, can use high-speed line
Material milling train is rolled.
Explanation will be further explained to the embodiment of the present invention by embodiment below, but do not indicated that this
The protection domain of invention is limited in described in embodiment in scope.
Embodiment 1
Certain steel plant is on 120 tons of (actual tap is in the range of 120~140 tons) bof processes of nominal capacity using this
Inventive technique produces band for building and strangles reinforcing bar, and production technology is to be blown into inert gas+feeding core-spun yarn → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoBand rib steel
Muscle.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.06% C, 0.025% P, 0.025% S, temperature are 1653 DEG C and constantly tapped into ladle that now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeV, FeNb, FeTi alloy and anthracite carry out Si, Mn, Cr, V, Nb, Ti and C element alloying, wherein the FeSi alloys added
Middle Si contents are that Mn contents are that V content is that Nb contents are in 78%, FeNb alloys in 82%, FeV alloys in 74%, FeMn alloys
Ti contents are 40% in 65%, FeTi alloy, and it is 92% that C is fixed in anthracite, and it is that 0.26%, Mn contains to control Si contents in molten steel
It is 0.10% to measure as 0.60%, Cr contents, V content 0.010%, Nb contents are 0.010%, Ti contents are 0.010%, C contains
Measure as 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is in the range of 0.0062% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1575 DEG C, and molten steel is sent to conticaster and entered
Row casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1535 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, 0.30%
Si, 0.61% Mn, 0.10% Cr, 0.010% V, 0.010% Nb, 0.010% Ti, 0.027% P,
0.023% S, 0.0060% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 950 DEG C, and soaking temperature is 1010 DEG C, and total heat 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 885 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 4 DEG C/s cooling velocity
To 605 DEG C, 400 DEG C then are cooled to 2 DEG C/s cooling velocity, after being finally cooled to 150 DEG C with 1.0 DEG C/s cooling velocity
The collection collection volume of steel is carried out, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 350MPa, tensile strength 480MPa, elongation are
35%th, maximum, force percentage of total elongation is 18.0%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation technology, C that the chemical constituent after preparation is 0.15%,
0.31% Si, 0.62% Mn, 0.010% V, 0.010% Nb, 0.010% Ti, 0.026% P, 0.025%
S, 0.0061% N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.
Examine compared steel mechanical property be：ReL (Rp0.2) is 345MPa, tensile strength 475MPa, elongation 35.0%, most
Percentage of total elongation is 18.0% energetically, and 180 DEG C of clod washes are qualified, and 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
2.468g/m2, the average weight-loss ratio of compared steel is 2.501g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
98.7%, corrosion test shows that steel of the present invention has certain decay resistance.
The corrosion resisting property assay of table 1
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+feeding core-spun yarn → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoBand rib steel
Muscle.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.15% C, 0.026% P, 0.023% S, tapping is into ladle when temperature is 1690 DEG C, and now actual tap is
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, FeTi and anthracite carry out Si, Mn, Cr, V, Nb, Ti and C element alloying, wherein the FeSi alloys added
Middle Si contents are that Mn contents are that Cr contents are that V content is in 54%, FeV alloys in 82%, FeCr alloys in 74%, FeMn alloys
Nb content is that the Ti contents in 65%, FeTi alloys are 40% in 78%, FeNb alloy, and it is 92% that C is fixed in anthracite, control
Si contents are 0.95% in molten steel processed, Mn contents are 1.25%, Cr contents are 0.30%, V content 0.080%, Nb contents are
0.030%th, Ti contents be 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is in the range of 0.0176% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is reduced, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1580 DEG C, and molten steel is sent to conticaster and entered
Row casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1540 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, 0.99%
Si, 1.26% Mn, 0.30% Cr, 0.080% V, 0.030% Nb, 0.030% Ti, 0.025% P,
0.022% S, 0.0175% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1215 DEG C, and soaking temperature is 1194 DEG C, and total heat time, which reaches to come out of the stove after 92min, to be rolled.
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 955 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 8 DEG C/S cooling velocity
To 650 DEG C, 450 DEG C then are cooled to 3 DEG C/S cooling velocity, after being finally cooled to 250 DEG C with 1.0 DEG C/S cooling velocity
The collection collection volume of steel is carried out, finally with steel band or steel wire bundling into the finished product wire rod steel for being readily transported and selling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 515MPa, tensile strength 695MPa, elongation are
22%th, maximum, force percentage of total elongation is 13%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
With the compared steel of preparation identical with above-mentioned preparation technology, C that the chemical constituent after preparation is 0.30%,
1.00% Si, 1.27% Mn, 0.080% V, 0.030% Nb, 0.030% Ti, 0.025% P, 0.025%
S, 0.0176% N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.
Examine compared steel mechanical property be：ReL (Rp0.2) is 510MPa, tensile strength 690MPa, elongation 22.0%, most
Percentage of total elongation is 13.0% energetically, and 180 DEG C of clod washes are qualified, and 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
2.432g/m2, the average weight-loss ratio of compared steel is 2.506g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
97.0%, corrosion test shows that steel of the present invention has certain decay resistance.
The corrosion resisting property assay of table 2
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+feeding core-spun yarn → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 200mm × 200mm steel billets → heating steel billet → high-speed wire rolling intoIt is with ribbing
Reinforcing bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.10% C, 0.015% P, 0.023% S, tapping is into ladle when temperature is 1690 DEG C, and now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeV, FeNb, FeTi alloy and anthracite carry out Si, Mn, Cr, V, Nb, Ti and C element alloying, wherein the FeSi alloys added
Middle Si contents are that Mn contents are that Cr contents are that V content is in 54%, FeV alloys in 82%, FeCr alloys in 74%, FeMn alloys
Nb contents in 78%, FeNb alloy are that the Ti contents in 65%, FeTi alloys are 40%, and it is 92% that C is fixed in anthracite, control
Si contents are 0.59% in molten steel processed, Mn contents are 0.95%, Cr contents are 0.55%, V content 0.055%, Nb contents are
0.025%th, Ti contents be 0.015%, 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is in the range of 0.0105% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1575 DEG C, and molten steel is sent to conticaster and entered
Row casting.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1555 DEG C during continuous casting,
The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.25% in conticaster C, 0.64%
Si, 0.92% Mn, 0.55% Cr, 0.055% V, 0.025% Nb, 0.015% Ti, 0.017% P,
0.020% S, 0.0102% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1125 DEG C, and soaking temperature is 1070 DEG C, and total heat 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 920 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 6 DEG C/s cooling velocity
To 695 DEG C, 500 DEG C then are cooled to 2.5 DEG C/s cooling velocity, is finally cooled to 300 with 0.75 DEG C/s cooling velocity
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 485MPa, tensile strength 670MPa, elongation are
23%th, maximum, force percentage of total elongation is 16%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation technology, C that the chemical constituent after preparation is 0.25%,
0.62% Si, 0.93% Mn, 0.056% V, 0.025% Nb, 0.015% Ti, 0.018% P, 0.022%
S, 0.03% Cr, 0.0105% N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.
Examine compared steel mechanical property be：ReL (Rp0.2) is 450MPa, tensile strength 665MPa, elongation 24.0%, most
Percentage of total elongation is 17.0% energetically, and 180 DEG C of clod washes are qualified, and 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
2.356g/m2, the average weight-loss ratio of compared steel is 2.505g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
94.17%, corrosion test shows that steel of the present invention has certain decay resistance.
The corrosion resisting property assay of table 3
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+feeding core-spun yarn → 6 after converter smelting → stove
Machine 6 flow billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoPole steel
Muscle.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are less than 0.060%.Molten iron and
After steel scrap adds converter, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.05% C, 0.025% P, 0.026% S, tapping is into ladle when temperature is 1685 DEG C, and now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeV, FeNb, FeTi alloy and anthracite carry out Si, Mn, Cr, V, Nb, Ti and C element alloying, wherein the FeSi alloys added
Middle Si contents are that Mn contents are that Cr contents are that V content is in 54%, FeV alloys in 82%, FeCr alloys in 74%, FeMn alloys
Nb contents in 78%, FeNb alloy are that the Ti contents in 65%, FeTi alloys are 40%, and it is 92% that C is fixed in anthracite, control
Si contents are 0.56% in molten steel processed, Mn contents are 0.94%, Cr contents are 0.40%, V content 0.030%, Nb contents are
0.015%th, Ti contents be 0.025%, 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is in the range of 0.0145% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1580 DEG C, and molten steel is sent to conticaster and entered
Row casting.
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 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.16% in conticaster C, 0.61%
Si, 0.95% Mn, 0.41% Cr, 0.030% V, 0.015% Nb, 0.025% Ti, 0.023% P,
0.024% S, 0.0142% N, remaining is Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to high-speed wire rolling production line after slab cooling to be heated, rolled, rolling specs arePole
Reinforcing bar.Slab heating temperature is 1145 DEG C, and soaking temperature is 1070 DEG C, and total heat 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 920 DEG C for target in high-speed rod-rolling mill rolling
The parameters such as temperature.
After Laying head has told after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with 5 DEG C/s cooling velocity
To 680 DEG C, 460 DEG C then are cooled to 2.5 DEG C/s cooling velocity, is finally cooled to 250 with 0.75 DEG C/s cooling velocity
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 445MPa, tensile strength 630MPa, elongation are
28%th, maximum, force percentage of total elongation is 17%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation technology, C that the chemical constituent after preparation is 0.15%,
0.62% Si, 0.96% Mn, 0.030% V, 0.015% Nb, 0.025% Ti, 0.022% P, 0.023%
S, 0.03% Cr, 0.0143% N, remaining is Fe and inevitable other impurity, and specification isPole reinforcing bar.
Examine compared steel mechanical property be：ReL (Rp0.2) is 430MPa, tensile strength 605MPa, elongation 27.0%, most
Percentage of total elongation is 16.0% energetically, and 180 DEG C of clod washes are qualified, and 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
2.421g/m2, the average weight-loss ratio of compared steel is 2.488g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel
97.3%, corrosion test shows that steel of the present invention has certain decay resistance.
The corrosion resisting property assay of table 4
Claims (9)
1. containing V, Nb, Ti, Cr microalloy building steel wire rod, it is characterised in that：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%, V：0.010~0.080%, Nb：0.010~0.030%, Ti：0.010~0.030%, Cr：0.10%~
0.60%, surplus is Fe and inevitable impurity.
2. the production method of the building steel wire rod containing V, Nb, Ti, Cr microalloy described in claim 1, it is characterised in that：Including with
Lower step：
It is blast-melted that steel billet is made through converter smelting, continuous casting；Steel billet is heated, high-speed rod-rolling mill carries out rolling and becomes a useful person, cools down
Pole wire rod or screw wire rod is made；Wherein, core-spun yarn adjustment N content is fed in the ladle of chain-wales after stove；The steel billet
Composition is C by weight percentage：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：0.010~0.080%, Nb：0.010~0.030%, Ti：0.010
~0.030%, Cr：0.10%~0.60%, surplus is Fe and inevitable impurity；The billet heating temperature controls
950~1220 DEG C, soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；The high-speed line
Laying head process in material milling train, it is 880~960 DEG C to control laying temperature；It is described to be cooled to first with 4~8 DEG C/s cooling
Speed is cooled to 600~700 DEG C, then 400~500 DEG C is cooled to 2~3 DEG C/s cooling velocity, finally with 0.5~1.0
DEG C/s cooling velocity is cooled to 150~300 DEG C.
3. the production method of the building steel wire rod according to claim 2 containing V, Nb, Ti, Cr microalloy, it is characterised in that：Bag
Include following steps：
A, converter smelting：Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat that molten steel C content is
0.05~0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
During tapping 1/3~2/3, FeSi, FeMn, FeCr, FeNb, FeTi and FeV or VN alloys are added, and increases C agent, controls C
For 0.15~0.30%, Si be 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010~0.080%, Cr 0.10%
~0.60%, Ti be 0.010~0.030%, Nb be 0.010~0.030%；
B, core-spun yarn is fed：Chain-wales ladle after stove is transferred to after tapping, inert gas is blown into ladle, adds core-spun yarn containing N, is controlled
N content is 0.0060~0.0180% in molten steel processed；
C, continuous casting：It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, by molten steel be casting continuously to form steel billet section for 150mm ×
150mm~200mm × 200mm square billet, is air-cooled to room temperature；
D, heating steel billet and rolling：Billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200
DEG C, heating and 90~120min of soaking total time, pole wire rod or screw wire rod, rolling knot are rolled into using high-speed rod-rolling mill
Cooled down after beam and produce product；Wherein, the Laying head process in the high-speed rod-rolling mill, it is 880~960 to control laying temperature
℃；It is described to be cooled to be cooled to 600~700 DEG C first with 4~8 DEG C/s cooling velocity, then with 2~3 DEG C/s cooling speed
Degree is cooled to 400~500 DEG C, is finally cooled to 150~300 DEG C with 0.5~1.0 DEG C/s cooling velocity.
4. the production method of the building steel wire rod according to claim 3 containing V, Nb, Ti, Cr microalloy, it is characterised in that：Step
In rapid a, the molten iron requires S content≤0.06%.
5. the production method of the building steel wire rod according to claim 3 containing V, Nb, Ti, Cr microalloy, it is characterised in that：Step
In rapid a, FeSi the and FeMn alloys FeSiMn alloy replacings.
6. the production method of the building steel wire rod according to claim 3 containing V, Nb, Ti, Cr microalloy, it is characterised in that：Step
In rapid b, described inert gas is at least one of argon gas or nitrogen.
7. the production method of the building steel wire rod according to claim 3 containing V, Nb, Ti, Cr microalloy, it is characterised in that：Step
In rapid b, the time >=2min for being blown into inert gas.
8. the production method of the building steel wire rod according to claim 3 containing V, Nb, Ti, Cr microalloy, it is characterised in that：Step
In rapid b, out-station temperature is higher than 60~90 DEG C of the liquidus temperature of steel.
9. the production method of the building steel wire rod according to claim 3 containing V, Nb, Ti, Cr microalloy, it is characterised in that：Step
In rapid d, the specification of the pole wire rod or screw wire rod is
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