CN107955899A - Steel wire rod and its production method are built containing V, Nb microalloy - Google Patents

Steel wire rod and its production method are built containing V, Nb microalloy Download PDF

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Publication number
CN107955899A
CN107955899A CN201711239895.4A CN201711239895A CN107955899A CN 107955899 A CN107955899 A CN 107955899A CN 201711239895 A CN201711239895 A CN 201711239895A CN 107955899 A CN107955899 A CN 107955899A
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steel
wire rod
microalloy
cooled
production method
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刘明
邓通武
雷秀华
张颖刚
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Priority to CN201711239895.4A priority Critical patent/CN107955899A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Metal Rolling (AREA)

Abstract

The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb 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 present invention provides one kind containing V, Nb 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%~0.100%, Nb:0.010%~0.030%, 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 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

Steel wire rod and its production method are built containing V, Nb microalloy
Technical field
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, Nb microalloy building steel wire rod and its producer 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 actually micro alloyed steel vanadium, niobium and titanium is inseparable with nitrogen, but under normal circumstances Using converter smelting steel, residual nitrogen content is in the range of 0.0030%~0.065%, using electric furnace smelting steel, residual nitrogen content In the range of 0.050%~0.085%, the effect of vanadium, niobium and titanium is in most cases such as given full play to, is to have to additionally Add what nitrogen could be realized.
Early stage increases nitrogen in micro alloyed steel, is realized by the nitridation class alloy of addition 3%~6%, but due to It is nitrogenous very low to nitrogenize class alloy, causes alloy addition big, and recovery rate is unstable, is gradually closed by the higher vanadium nitride of nitrogen content Jin Dynasty is replaced.At present almost it is difficult to reuse 3%~6% nitridation class alloy, almost all was using both in the production of micro alloyed steel Containing vanadium and nitrogen content and high alloy of vanadium nitride.Alloy of vanadium nitride mainly has tri- trades mark of VN12, VN14 and VN16.Ordinary circumstance The ratio of lower three trade mark nitrogen and vanadium is substantially stationary, be respectively 12 ︰ 78,14 ︰ 78,16 ︰ 78, the i.e. ratio of nitrogen and vanadium most 16 ︰ 78 of a height of VN16, i.e., containing 16% N in alloy, contain 78% vanadium.Although alloy of vanadium nitride both contains vanadium and nitrogen content It is again high, but for micro-alloying technology route different in micro alloyed steel, composite micro-alloyed steel, such as V-Ti-N are particularly, very As for V-Ti-Nb-N, and it is unable to meet demand.
The content of the invention
The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, and the present invention carries A kind of new method for preparing nitrogen-containing alloy is supplied.This method adjusts nitrogen content in microalloy, energy using nitrogenous core-spun yarn is added Enough N contents being more accurately controlled in steel, the micro alloyed steel nitrogen recovery rate of preparation is high, and cost is low.
First technical problem to be solved by this invention is to provide a kind of containing V, Nb microalloy building steel wire rod.This contain V, Nb microalloys 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%~0.100%, Nb:0.010%~0.030%, surplus is Fe and inevitable impurity.
Present invention also offers a kind of production method of the above-mentioned building steel wire rod containing V, Nb microalloy.The production method includes 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 component 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%~0.100%, Nb:0.010%~ 0.030%, surplus is Fe and inevitable impurity;The billet heating temperature control is 950~1220 DEG C, soaking temperature control 1000~1200 DEG C are made as, is heated and 90~120min of soaking total time;Laying head process in the high-speed rod-rolling mill, control Laying temperature processed is 880~960 degree;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, so 400~500 DEG C are cooled to the cooling velocity of 2~3 DEG C/s afterwards, is finally cooled to 150 with the cooling velocity of 0.5~1.0 DEG C/s ~300 DEG C.
Further, the production method of the above-mentioned building steel wire rod containing V, Nb 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%, whens liquid steel temperature >=1650 DEG C taps;
During tapping 1/3~2/3, FeSi, FeMn, FeNb and FeV or VN alloys are added, and increases C agent, it is 0.15 to control C ~0.30%, Si is 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010~0.100%, 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 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 production method of the above-mentioned building steel wire rod containing V, Nb microalloy, molten iron described in step a requires S contents ≤ 0.06%.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb microalloy, FeSi and FeMn alloys described in step a With FeSiMn alloy replacings.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb microalloy, the inert gas described in step b is argon At least one of gas or nitrogen.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb microalloy, inert gas is blown into described in step b Time >=2min.
Wherein, in the high speed wire rolling production method of the above-mentioned building steel wire rod containing V, Nb microalloy, step b out-station temperatures are higher than 60~90 DEG C of the liquidus temperature of steel.
Wherein, in the production method of the above-mentioned building steel wire rod containing V, Nb microalloy, pole wire rod or building described in step d It is with the specification of screw wire rod
The present invention adds alloying component V by designing a kind of microalloy building iron containing V, Nb in steel:0.010~ 0.100%, Nb:0.010~0.030%, then coordinate the tune by the way of the chain-wales feeding core-spun yarn containing N after converter smelting stove N content in whole steel, and coordinate and rolled using high speed wire rolling production line, the parameters such as suitable laying temperature and cooldown rate are controlled, The microalloy building iron containing V, Nb that a kind of intensity is high, nitrogen recovery rate is high, function admirable can finally be prepared.The method of the present invention Easy to operate, nitrogen recovery rate is high and stablizes, moreover it is possible to effectively reduces production cost, is worth of widely use.
Embodiment
It is containing V, Nb microalloy building steel wire rod, its chemical composition the present invention provides one kind:By weight percentage, C: 0.15%~0.30%, Si:0.30%~1.00%, Mn:0.60%~1.30%, N:0.0060%~0.0180%, P≤ 0.040%th, S≤0.040%, V:0.010%~0.100%, Nb:0.010%~0.030%, surplus is for Fe and unavoidably Impurity.
In above-mentioned chemical composition, containing 0.0060%~0.0180% nitrogen in steel, using add 0.010%~ 0.100%V and 0.010%~0.030%Nb is to being fixed, to ensure the aging performance of steel.Converter is used under normal circumstances Method smelting steel, the residual nitrogen content in final finished steel are residual using electric furnace smelting steel in the range of 0.0030%~0.0065% Stay nitrogen content then in the range of 0.0050%~0.0085%.Higher nitrogen content, timeliness are deteriorated therewith in steel, therefore work as nitrogen Content is higher than 0.006%, and with the increase of nitrogen content, it is necessary to and add suitable nitrogen killer and fixed, it is of the invention then use The mode of 0.010%~0.100%V and 0.010%~0.030%Nb is added, to ensure the timeliness of steel, while can also be filled The solution strengthening effect of nitrogen is waved in distribution, so as to improve the intensity of steel, reduces the cost of alloy of steel.
In addition, in above-mentioned chemical composition, because the nitrogen content in molten steel is higher than residual nitrogen content in usual steel, vanadium and niobium plus Enter and be also more prone to form V (C, N) and Nb (C, N) particle, so as to promote the precipitation of V and Nb, can more fully play The precipitation strength and Grain Refinement Effect of vanadium and niobium, to improve the comprehensive mechanical property of steel, on the premise of equal mechanical property, The usage amount of vanadium and niobium can be reduced.
Present invention also offers prepare above-mentioned V, Nb microalloy building steel wire rod bof process technique:After converter smelting → stove It is blown into inert gas+feeding core-spun yarn → and is casting continuously to form steel billet → heating steel billet → high-speed wire rolling production line and rolls and becomes a useful person.Under Face describes bof process technology of the present invention in detail:
The first step:Converter smelting
Molten iron and steel scrap are added first in converter, it is desirable to which the molten iron S contents of addition are not more than 0.060%.Molten iron and useless After steel adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines 0.05%~0.15% C, P is no more than 0.025%, S is not more than 0.035%, and when tapping temperature is not less than 1650 DEG C taps Into ladle.
The FeSi alloys containing Si elements, the FeMn alloys containing Mn elements, the conjunction containing V element are added in tapping process Gold, the alloy containing Nb elements, and carbon dust or anthracite etc. increase C agent, and control C is in the range of 0.15%~0.30%, control Si is in the range of 0.30%~1.00%, and Mn is in the range of 0.60%~1.30% for control, and V is 0.010%~0.100% for control In the range of, Nb 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, FeNb, FeV or VN alloy, and 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 inspection result 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 at this time, 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.The 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, 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.
4th 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+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, 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, 0.023% P, 0.025% S, tapping is into ladle when temperature is 1655 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, FeV, FeNb alloys and anthracite carry out Si, Mn, V, Nb and C element alloying, wherein Si contents are 74% in the FeSi alloys added, Mn contents are that V content is that Nb contents are 65% in 78%, FeNb alloys in 82%, FeV alloys in FeMn alloys, solid in anthracite C is determined for 92%, controls in molten steel that Si contents are 0.26%, Mn contents are 0.61%, V content 0.010%, Nb contents are 0.010%th, C content 0.15%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is in the range of 0.0065% 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 Adjust liquid steel temperature, it is outbound before carry out thermometric again, when liquid steel temperature be 1575 DEG C when it is outbound, and by molten steel be sent to conticaster into 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, 0.31% Si, 0.62% Mn, 0.010% V, 0.010% Nb, 0.024% P, 0.024% S, 0.0063% 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 950 DEG C, and soaking temperature is 1010 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 885 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 350MPa, tensile strength 475MPa, elongation are 35%th, maximum, force percentage of total elongation is 19.0%.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 produce HRB400 (E) Ribbed Bar for building, production technology be converter smelting → stove after be blown into inert gas+feeding The machine 6 of core-spun yarn → 6 flow billet caster be cast into 150mm × 150mm steel billets → heating steel billet → high-speed wire rolling intoRibbed 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, 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 0.15% C, 0.016% P, 0.020% S, tapping is into ladle when temperature is 1685 DEG C, and actual tap is at this time 133 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close Gold, FeNb and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn in the FeSi alloys added Mn contents are that the content that V content is Nb in 78%, FeNb alloys in 82%, FeV alloys is 65% in alloy, fixed in anthracite C is 92%, controls in molten steel that Si contents are 0.94%, Mn contents are 1.26%, V content 0.100%, Nb contents are 0.030%th, 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 0.0178% 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 Reduce liquid steel temperature, it is outbound before carry out thermometric again, when liquid steel temperature be 1580 DEG C when it is outbound, and by molten steel be sent to conticaster into 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, 1.27% Mn, 0.100% V, 0.030% Nb, 0.017% P, 0.018% S, 0.0180% 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 1215 DEG C, and soaking temperature is 1194 DEG C, and total heating 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 spat after silk pole wire rod steel or Ribbed Bar wire rod steel, cooled down first with the cooling velocity of 8 DEG C/s To 650 DEG C, 450 DEG C then are cooled to the cooling velocity of 3 DEG C/s, after being finally cooled to 250 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 515MPa, tensile strength 695MPa, elongation are 21%th, maximum, force percentage of total elongation is 13%, 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+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 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 0.10% C, 0.024% P, 0.024% S, tapping is into ladle when temperature is 1690 DEG C, and actual tap is at this time 133 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close Gold, FeNb and anthracite carry out Si, Mn, V and C element alloying, wherein Si contents are 74%, FeMn in the FeSi alloys added Mn contents are that the content that V content is Nb in 78%, FeNb alloys in 82%, FeV alloys is 65% in alloy, fixed in anthracite C is 92%, controls in molten steel that Si contents are 0.57%, Mn contents are 0.94%, V content 0.065%, Nb contents are 0.025%th, 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 0.0130% 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 Adjust liquid steel temperature, it is outbound before carry out thermometric again, when liquid steel temperature be 1575 DEG C when it is outbound, and by molten steel be sent to conticaster into 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, 0.62% Si, 0.93% Mn, 0.065% V, 0.025% Nb, 0.023% P, 0.022% S, 0.0130% 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 1125 DEG C, and soaking temperature is 1070 DEG C, and total heating time, which reaches to come out of the stove after 98min, to be rolled.
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 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 475MPa, tensile strength 650MPa, elongation are 23%th, maximum, force percentage of total elongation is 16%, 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+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, 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, 0.019% P, 0.024% S, tapping is into ladle when temperature is 1685 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, FeV, FeNb alloys and anthracite carry out Si, Mn, V, Nb and C element alloying, wherein Si contents are 74% in the FeSi alloys added, Mn contents are that V content is that Nb contents are 65% in 78%, FeNb alloys in 82%, FeV alloys in FeMn alloys, solid in anthracite C is determined for 92%, controls in molten steel that Si contents are 0.57%, Mn contents are 0.95%, V content 0.030%, Nb contents are 0.015%th, 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 0.0100% 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 Adjust liquid steel temperature, it is outbound before carry out thermometric again, when liquid steel temperature be 1580 DEG C when it is outbound, and by molten steel be sent to conticaster into 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, 0.62% Si, 0.96% Mn, 0.030% V, 0.015% Nb, 0.022% P, 0.021% S, 0.0098% N, remaining is Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to high-speed wire rolling production line and heated, rolled, rolling specs arePole Reinforcing bar.Slab heating temperature is 1150 DEG C, and soaking temperature is 1100 DEG C, and total heating time, which reaches to come out of the stove after 99min, 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 430MPa, tensile strength 605MPa, elongation are 27%th, maximum, force percentage of total elongation is 16%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.

Claims (9)

1. containing V, Nb microalloy building steel wire rod, it is characterised in that:Chemical composition is:By weight percentage, C:0.15~ 0.30%th, Si:0.30~1.00%, Mn:0.60~1.30%, N:0.0060~0.0180%, P≤0.040%, S≤ 0.040%th, V:0.010%~0.100%, Nb:0.010%~0.030%, surplus is Fe and inevitable impurity.
2. the production method of the building steel wire rod containing V, Nb microalloy 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, 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 Component 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%~0.100%, Nb:0.010%~0.030%, surplus For Fe and inevitable impurity;Billet heating temperature control is 950~1220 DEG C, soaking temperature control for 1000~ 1200 DEG C, heat and 90~120min of soaking total time;Laying head process in the high-speed rod-rolling mill, controls laying temperature For 880~960 DEG C;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 2~3 DEG C/ The cooling velocity of s 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.
3. the production method of the building steel wire rod according to claim 2 containing V, Nb microalloy, it is characterised in that:Including following 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, add FeSi, FeMn, FeNb and FeV or VN alloys, and increase C agent, control C be 0.15~ 0.30%th, Si is 0.30~1.00%, Mn is 0.60~1.30%, V is 0.010~0.100%, 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 × 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 production method of the building steel wire rod according to claim 3 containing V, Nb microalloy, it is characterised in that:In step 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 microalloy, it is characterised in that:In step 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 microalloy, it is characterised in that:In step b, The 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 microalloy, it is characterised in that:In step b, Time >=the 2min for being blown into inert gas.
8. the production method of the building steel wire rod according to claim 3 containing V, Nb microalloy, it is characterised in that:In step 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 microalloy, it is characterised in that:In step d, The specification of the pole wire rod or screw wire rod is
CN201711239895.4A 2017-11-30 2017-11-30 Steel wire rod and its production method are built containing V, Nb microalloy Pending CN107955899A (en)

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