CN107815601A - Steel wire rod and its LF stove production methods are built containing Nb, Cr microalloy - Google Patents

Steel wire rod and its LF stove production methods are built containing Nb, Cr microalloy Download PDF

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CN107815601A
CN107815601A CN201711239934.0A CN201711239934A CN107815601A CN 107815601 A CN107815601 A CN 107815601A CN 201711239934 A CN201711239934 A CN 201711239934A CN 107815601 A CN107815601 A CN 107815601A
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steel
wire rod
microalloy
production methods
cooled
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CN107815601B (en
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刘明
邓通武
雷秀华
王西江
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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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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/18—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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  • 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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Rolling (AREA)

Abstract

The invention belongs to field of steel metallurgy, and in particular to one kind is containing Nb, Cr microalloy building steel wire rod and its LF stove production methods.The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, the invention provides one kind containing Nb, Cr microalloy building steel wire rod and its LF stove production methods.The constituent of the wire rod is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N：0.0060%~0.0180%, P≤0.040%, S≤0.040%, Nb：0.010%~0.050%, Cr：0.10%~0.60%, surplus is Fe and inevitable impurity.The key of its preparation method adjusts N to suitable level in feeding core-spun yarn containing N in LF stoves.The 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

Steel wire rod and its LF stove production methods are built containing Nb, Cr microalloy
Technical field
The invention belongs to field of steel metallurgy, and in particular to one kind is containing Nb, Cr microalloy building steel wire rod and its life of LF stoves Production method.
Background technology
Micro alloyed steel is primarily referred to as adding certain either micro element of minimal amount in steel with regard to that can significantly improve performance Steel, particularly improve steel intensity index.It is either micro- mainly 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 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 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 not only containing vanadium and nitrogen content but also Height, but for micro-alloying technology route different in micro alloyed steel, particularly composite micro-alloyed steel, such as V-Ti-N, even In 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 containing Nb, Cr microalloy building steel wire rod.This contains Nb, Cr microalloy building steel wire rod chemical composition be：By weight percentage, C：0.15%~0.30%, Si：0.30%~ 1.00%th, Mn：0.60%~1.30%, N：0.0060%~0.0180%, P≤0.040%, S≤0.040%, Nb： 0.010%~0.050%, Cr：0.10%~0.60%, surplus is Fe and inevitable impurity.
Present invention also offers the LF stove production methods of the above-mentioned building steel wire rod containing Nb, Cr microalloy.The LF stove producers Method comprises the following steps：
It is blast-melted that steel billet is made through converter smelting, the refining of LF stoves, continuous casting；Steel billet is heated, high-speed rod-rolling mill is carried 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 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%, Nb：0.010%~0.050%, Cr： 0.10%~0.60%, surplus is Fe and inevitable impurity；The billet heating temperature control is 950~1220 DEG C, Hot temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；Spinning in the high-speed rod-rolling mill Machine process, it is 880~960 DEG C to control laying temperature；It is described be cooled to be cooled to 600 first with 4~8 DEG C/s cooling velocity~ 700 DEG C, 400~500 DEG C then are cooled to 2~3 DEG C/s cooling velocity, it is finally cold with 0.5~1.0 DEG C/s cooling velocity But to 150~300 DEG C.
Further, the LF stove production methods of the above-mentioned building steel wire rod containing Nb, Cr microalloy, comprise the following steps：
A, converter smelting：Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat that molten steel C contains Measure as 0.05~0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
Tapping 1/3~2/3 when, add FeSi, FeMn, FeCr and FeNb alloy, and increase C agent, control C be 0.15~ 0.30%th, Si is 0.30~1.00%, Mn is 0.60~1.30%, Cr is 0.10~0.60%, 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 × 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 LF stove production methods of the above-mentioned building steel wire rod containing Nb, Cr microalloy, molten iron described in step a requires S Content≤0.06%.
Wherein, it is above-mentioned containing Nb, Cr microalloy building steel wire rod LF stove production methods in, FeSi described in step a and FeMn alloys FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing Nb, Cr microalloy, the indifferent gas described in step b Body is at least one of argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing Nb, Cr microalloy, inertia is blown into described in step b The time of gas >=2min.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing Nb, Cr microalloy, step b electrical heating temperatures are higher than 60~90 DEG C of liquidus temperature.
Wherein, in the LF stove production methods of the above-mentioned building steel wire rod containing Nb, Cr microalloy, pole wire rod described in step d Or the specification of screw wire rod is
The present invention adds alloying component Nb by designing a kind of microalloy building iron containing Nb, Cr in steel：0.010~ 0.050%th, Cr：0.10%~0.60%, then coordinate and adjusted by the way of core-spun yarn containing N is fed in ladle after the refining of LF stoves N content in steel, and coordinate and rolled using high speed wire rolling production line, the parameters such as suitable laying temperature and cooldown rate are controlled, most The microalloy building iron containing Nb, Cr that a kind of intensity is high, nitrogen recovery rate is high, function admirable can be prepared eventually.The inventive method Simple to operate, nitrogen recovery rate is high and stably, moreover it is possible to effectively reduces production cost, is worth of widely use.
Embodiment
It is containing Nb, Cr microalloy building steel wire rod, its chemical composition the 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%, Nb：0.010%~0.050%, Cr：0.10%~0.60%, surplus is for Fe and inevitably 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.Generally use converter smelting steel, the residual nitrogen in final finished steel contains Amount is in the range of 0.0030%~0.0065%, and using electric furnace smelting steel, residual nitrogen content is then 0.0050%~0.0085% In the range of.Higher nitrogen content, ageing to be deteriorated therewith in steel, therefore, when nitrogen content is higher than 0.006%, and with nitrogen content Increase, it is necessary to add appropriate nitrogen killer and fixed, it is of the invention then use add 0.010%~0.050%Nb side Formula, to ensure the ageing of steel, while the solution strengthening effect of nitrogen can also be given full play to, so as to improve the intensity of steel, reduced 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 Nb invigoration effect is given full play to, to reduce Nb alloying cost, Nb addition can also be reduced after addition N.And add Cr It is to improve corrosion resisting property.
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 Nb, Cr microalloy building steel wire rod bof process technique：Converter smelting → LF Refining+feeding core-spun yarn → is casting continuously to form steel billet → heating steel billet → high-speed wire rolling production line rolling and become a useful person.Chat in detail below State bof process technology of the present invention：
The first step：Converter smelting
Molten iron and steel scrap are added first in converter, it is desirable to which the molten iron S contents of addition are not more than 0.060%；Molten iron and useless After steel adds converter, 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 are no more than 0.025%, S is not more than 0.035%, and tapping is arrived when tapping temperature is not less than 1650 DEG C In ladle；
The FeSi alloys containing Si elements are added in tapping process, the FeMn alloys containing Mn elements, contain Cr elements FeCr alloys, the alloy containing Nb elements, and carbon dust or anthracite etc. increase C agent, and C is in 0.15%~0.30% scope for control Interior, control Si is in the range of 0.30%~1.00%, and Mn is in the range of 0.60%~1.30% for control, control Cr 0.10%~ In the range of 0.60%, Nb is in the range of 0.010%~0.050% for control；Require in addition that, tap 1/3 when be initially added into FeSi, FeMn, FeCr, FeNb 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
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 detected, 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, 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.
5th 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, exit temperature at finishing, deflection in the high-speed rod-rolling mill operation of rolling, 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 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, 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 0.09% C, 0.022% P, 0.026% S, tapping is into ladle when temperature is 1674 DEG C, and now actual tap is 132 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr, FeNb alloys and anthracite carry out Si, Mn, Cr, Nb and C element alloying, wherein Si contents are in the FeSi alloys added Mn contents are that Cr contents are that Nb contents are 65% in 54%, FeNb alloys in 82%, FeCr alloys in 74%, FeMn alloy, nothing C is fixed in bituminous coal as 92%, controls in molten steel that Si contents are 0.27%, Mn contents are 0.61%, Cr contents are 0.10%, Nb contains Measure as 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, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1577 DEG C Cored wire, it is 0.0061% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then Molten steel is sent into conticaster to be cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1546 DEG C during continuous casting, The liquidus temperature of steel is 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, 0.31% Si, 0.62% Mn, 0.10% Cr, 0.010% Nb, 0.027% P, 0.022% S, 0.0064% 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 959 DEG C, and soaking temperature is 1007 DEG C, and total heat time, which reaches to come out of the stove after 118min, 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 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 352MPa, tensile strength 483MPa, and elongation is 36.2%, maximum, force percentage of total elongation is 18.1%, and 180 DEG C of clod washes are qualified, and 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 0.16%, 0.32% Si, 0.61% Mn, 0.010% Nb, 0.026% P, 0.020% S, 0.0064% 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 346MPa, and tensile strength 478MPa, elongation 35.9%, maximum, force percentage of total elongation is 18.1%, 180 DEG C clod wash is 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 2.511g/m2, the average weight-loss ratio of compared steel is 2.432g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel 96.9%, corrosion test shows that steel of the present invention has certain 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, production technology be blown into after converter smelting → stove inert gas → LF stove heats → plus 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 0.08% C, 0.022% P, 0.024% S, tapping is into ladle when temperature is 1681 DEG C, and now actual tap is 132 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr, FeNb alloys and anthracite carry out Si, Mn, Cr, Nb and C element alloying, wherein Si contents are in the FeSi alloys added Mn contents are that Cr contents are that Nb contents are 65% in 54%, FeNb alloys in 82%, FeCr alloys in 74%, FeMn alloy, nothing It is 92% that C is fixed in bituminous coal, and it is that 0.93%, Mn contents are that 1.28%, Cr contents are that 0.30%, Nb contains to control Si contents in molten steel Measure as 0.050%, C content 0.30%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen 4~5min of gas, all kinds of alloys of addition are made fully to 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 1579 DEG C Cored wire, it is 0.0170% 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 into conticaster to be cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1526 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, 1.00% Si, 1.28% Mn, 0.29% Cr, 0.050% Nb, 0.027% P, 0.016% S, 0.0177% 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 areBand Rib reinforcement.Slab heating temperature is 959 DEG C, and soaking temperature is 1006 DEG C, and total heat 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 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 540MPa, tensile strength 701MPa, and elongation is 18.1%, maximum, force percentage of total elongation is 11.4%, 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 0.29%, 0.97% Si, 1.30% Mn, 0.049% Nb, 0.022% P, 0.018% S, 0.0178% N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine the mechanical property of compared steel For：ReL (Rp0.2) is 504MPa, and tensile strength 682MPa, elongation 18.8%, maximum, force percentage of total elongation is 11.1%, 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 2.507g/m2, the average weight-loss ratio of compared steel is 2.374g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel 94.7%, 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, production technology be blown into after converter smelting → stove inert gas → LF stove heats → plus 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 0.12% C, 0.020% P, 0.023% S, tapping is into ladle when temperature is 1672 DEG C, and now actual tap is 132 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr, FeNb alloys and anthracite carry out Si, Mn, Cr, Nb and C element alloying, wherein Si contents are in the FeSi alloys added Mn contents are that Cr contents are that Nb contents are 65% in 54%, FeNb alloys in 82%, FeCr alloys in 74%, FeMn alloy, nothing It is 92% that C is fixed in bituminous coal, and it is that 0.62%, Mn contents are that 0.97%, Cr contents are that 0.59%, Nb contains to control Si contents in molten steel Measure as 0.025%, C content 0.22%.
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, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1584 DEG C Cored wire, it is 0.0125% 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 into conticaster to be cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1538 DEG C during continuous casting, The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.21% in conticaster C, 0.66% Si, 1.01% Mn, 0.60% Cr, 0.025% Nb, 0.027% P, 0.021% S, 0.0126% 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 areBand Rib reinforcement.Slab heating temperature is 1125 DEG C, and soaking temperature is 1072 DEG C, and total heat 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 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 469MPa, tensile strength 629MPa, and elongation is 22.1%, maximum, force percentage of total elongation is 15.1%, 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 0.23%, 0.63% Si, 1.03% Mn, 0.025% Nb, 0.028% P, 0.019% S, 0.0121% N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine the mechanical property of compared steel For：ReL (Rp0.2) is 429MPa, and tensile strength 591MPa, elongation 21.2%, maximum, force percentage of total elongation is 15.3%, 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 2.509g/m2, the average weight-loss ratio of compared steel is 2.331g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel 92.9%, 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, production technology be blown into after converter smelting → stove inert gas → LF stove heats → plus 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 0.08% C, 0.018% P, 0.024% S, tapping is into ladle when temperature is 1685 DEG C, and now actual tap is 132 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr, FeNb alloys and anthracite carry out Si, Mn, Cr, Nb and C element alloying, wherein Si contents are in the FeSi alloys added Mn contents are that Cr contents are that Nb contents are 65% in 54%, FeNb alloys in 82%, FeCr alloys in 74%, FeMn alloy, nothing It is 92% that C is fixed in bituminous coal, and it is that 0.58%, Mn contents are that 0.87%, Cr contents are that 0.38%, Nb contains to control Si contents in molten steel Measure as 0.015%, C content 0.19%.
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, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1581 DEG C Cored wire, it is 0.0106% 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 into conticaster to be cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1534 DEG C during continuous casting, The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.19% in conticaster C, 0.62% Si, 0.88% Mn, 0.40% Cr, 0.014% Nb, 0.023% P, 0.016% S, 0.0109% 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 areCircle Bar reinforcement.Slab heating temperature is 1152 DEG C, and soaking temperature is 1100 DEG C, and total heat 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 told after silk pole wire rod steel or pole wire roll 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 4435MPa, tensile strength 618MPa, and elongation is 22.7%, maximum, force percentage of total elongation is 16.2%, 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 0.17%, 0.65% Si, 0.78% Mn, 0.040% V, 0.024% P, 0.022% S, 0.0099% N, 0.03% Cr, remaining is Fe and inevitable other impurity, and specification isPole reinforcing bar.Examine the mechanical property of compared steel For：ReL (Rp0.2) is 422MPa, and tensile strength 591MPa, elongation 26.3%, maximum, force percentage of total elongation is 17.1%, 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 2.498g/m2, the average weight-loss ratio of compared steel is 2.412g/m2, steel of the present invention is relative to the relatively corrosive rate of compared steel 96.6%, 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 Nb, Cr microalloy building steel wire rod, it is characterised in that：Chemical composition is：By weight percentage, C：0.15%~ 0.30%th, Si：0.30%~1.00%, Mn：0.60%~1.30%, N：0.0060%~0.0180%, P≤0.040%, S ≤ 0.040%, Nb：0.010%~0.050%, Cr：0.10%~0.60%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building steel wire rod containing Nb, 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, 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 composition：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%, Cr： 0.10%~0.60%, surplus is Fe and inevitable impurity；The billet heating temperature control is 950~1220 DEG C, Hot temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；Spinning in the high-speed rod-rolling mill Machine process, it is 880~960 DEG C to control laying temperature；It is described be cooled to be cooled to 600 first with 4~8 DEG C/s cooling velocity~ 700 DEG C, 400~500 DEG C then are cooled to 2~3 DEG C/s cooling velocity, it is finally cold with 0.5~1.0 DEG C/s cooling velocity But to 150~300 DEG C.
3. the LF stove production methods of the building steel wire rod according to claim 2 containing Nb, 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；
Tapping 1/3~2/3 when, add FeSi, FeMn, FeCr and FeNb alloy, and increase C agent, control C be 0.15~ 0.30%th, Si is 0.30~1.00%, Mn is 0.60~1.30%, Cr is 0.10~0.60%, 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；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 × 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 LF stove production methods of the building steel wire rod according to claim 3 containing Nb, Cr microalloy, it is characterised in that：Step In rapid a, the molten iron requires S content≤0.06%.
5. the LF stove production methods of the building steel wire rod according to claim 3 containing Nb, Cr microalloy, it is characterised in that：Step In rapid a, FeSi the and FeMn alloys FeSiMn alloy replacings.
6. the LF stove production methods of the building steel wire rod according to claim 3 containing Nb, 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 LF stove production methods of the building steel wire rod according to claim 3 containing Nb, Cr microalloy, it is characterised in that：Step In rapid b, the time >=2min for being blown into inert gas.
8. the LF stove production methods of the building steel wire rod according to claim 3 containing Nb, Cr microalloy, it is characterised in that：Step In rapid b, electrical heating temperature is higher than 60~90 DEG C of liquidus temperature.
9. the LF stove production methods of the building steel wire rod according to claim 3 containing Nb, 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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