CN107815525A - Microalloy containing Nb builds steel wire rod and its production method - Google Patents
Microalloy containing Nb builds steel wire rod and its production method Download PDFInfo
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- CN107815525A CN107815525A CN201711242319.5A CN201711242319A CN107815525A CN 107815525 A CN107815525 A CN 107815525A CN 201711242319 A CN201711242319 A CN 201711242319A CN 107815525 A CN107815525 A CN 107815525A
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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
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to field of steel metallurgy, and in particular to a kind of building steel wire rod of microalloy containing Nb and its 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, and the invention provides a kind of building steel wire rod of microalloy containing Nb 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%, Nb：0.010~0.050%, 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 a kind of building steel wire rod of microalloy containing Nb and its 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 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 height of preparation, cost are low.
First technical problem to be solved by this invention is to provide a kind of building of microalloy containing Nb steel wire rod.The wire rod contains
The chemical composition of Nb microalloy building irons is：By weight percentage, C：0.15~0.30%, Si：0.30~1.00%, Mn：
0.60~1.30%, N：0.0060~0.0180%, P≤0.040%, S≤0.040%, Nb：0.010~0.050%, surplus
For Fe and inevitable impurity.
Present invention also offers a kind of production method of the above-mentioned building of microalloy containing Nb steel wire rod.The production method include 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 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%, Nb：0.010~0.050%, surplus is for Fe and inevitably
Impurity；The billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and soaking
90~120min of total time；Laying head process in the high-speed rod-rolling mill, it is 880~960 DEG C to control laying temperature；It is described
It is cooled to be cooled to 600~700 DEG C first with 4~8 DEG C/s cooling velocity, is then cooled to 2~3 DEG C/s cooling velocity
400~500 DEG C, finally it is cooled to 150~300 DEG C with 0.5~1.0 DEG C/s cooling velocity.
Further, the production method of the above-mentioned building of microalloy containing Nb steel wire rod, 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；
Tapping 1/3~2/3 when, add FeSi, FeMn and FeNb alloy, and increase C agent, control C be 0.15~0.30%,
Si is 0.30~1.00%, Mn is 0.60~1.30%, Nb is 0.010~0.050%；
B, core-spun yarn is fed：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, 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 production method of the above-mentioned building of microalloy containing Nb steel wire rod, the requirement S of molten iron described in step a contents≤
0.06%.
Wherein, in the production method of the above-mentioned building of microalloy containing Nb steel wire rod, FeSi and FeMn alloys described in step a are used
FeSiMn alloy replacings.
Wherein, in the production method of the above-mentioned building of microalloy containing Nb steel wire rod, the inert gas described in step b is argon gas
Or at least one of nitrogen.
Wherein, in the production method of above-mentioned microalloy containing Nb building steel wire rod, be blown into described in step b inert gas when
Between >=2min.
Wherein, in the production method of the above-mentioned building of microalloy containing Nb steel wire rod, step b out-station temperatures are higher than the liquidus curve of steel
60~90 DEG C of temperature.
Wherein, in the production method of the above-mentioned building of microalloy containing Nb steel wire rod, pole wire rod described in step d or screw thread disk
The specification of bar is
The present invention adds alloying component Nb by designing a kind of microalloy building iron containing Nb in steel：0.010~
0.050%, then coordinate and adjust N content in steel by the way of the chain-wales feeding core-spun yarn containing N after converter smelting stove, and coordinate
Rolled using high speed wire rolling production line, control the parameters such as suitable laying temperature and cooldown rate, can finally be prepared one
The building iron of microalloy containing Nb that kind intensity is high, nitrogen recovery rate is high, function admirable.The inventive method is simple to operate, and nitrogen recovery rate is high
And stably, moreover it is possible to effectively reduce production cost, be worth of widely use.
Embodiment
The invention provides a kind of building of microalloy containing Nb steel wire rod, its chemical composition is：By weight percentage, C：
0.15~0.30%, Si：0.30~1.00%, Mn：0.60~1.30%, N：0.0060~0.0180%, P≤0.040%, S
≤ 0.040%, Nb：0.010~0.050%, surplus is Fe and inevitable impurity.
In above-mentioned chemical composition, containing 0.0060%~0.0180% nitrogen in steel, using 0.010%~0.050%Nb
To being fixed, to ensure the aging performance of steel.Generally use converter process smelting steel, the residual nitrogen in final finished steel
Content is in the range of 0.0030%~0.0065%, using electric furnace smelting steel, residual nitrogen content then 0.0050%~
In the range of 0.0085%.Higher nitrogen content, ageing to be deteriorated therewith in steel, therefore, when nitrogen content be higher than 0.006%, and with
The increase of nitrogen content, it is necessary to add appropriate nitrogen killer and fixed, of the invention then use addition 0.010%~0.050%
Nb mode, 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 strong of steel
Degree, 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, 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.
Present invention also offers prepare above-mentioned Nb microalloys building steel wire rod bof process technique：Converter smelting → stove after-blow
Enter inert gas+feeding core-spun yarn → and be casting continuously to form the rolling of steel billet → heating steel billet → high-speed wire rolling production line to become a useful person.Below
Bof process technology of the present invention is described 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, 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 tap when tapping temperature is not less than 1650 DEG C
Into ladle；
The FeSi alloys containing Si elements are added in tapping process, the FeMn alloys containing Mn elements, contain Nb elements
Alloy, and carbon dust or anthracite etc. increase C agent, control C is in the range of 0.15%~0.30%, control Si 0.30%~
In the range of 1.00%, Mn is in the range of 0.60%~1.30% for control, and Nb is in the range of 0.010%~0.050% for control.In addition
It is required that being initially added into FeSi, FeMn, FeNb alloy and carbon dust or anthracite etc. in tapping 1/3 increases C agent, must when tapping to 2/3
It must add；
In the addition of above-mentioned alloy, also FeSi and FeMn alloys can be replaced using the FeSiMn alloys containing Si and Mn.
Second step：Inert gas is blown into after Converter 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.
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.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 more than 2min, to ensure the uniformity of N element in molten steel, and controls outbound liquid steel temperature.
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 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, the molten iron S contents 0.060% of addition are added first in converter.Molten iron and steel scrap
After adding 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, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1650 DEG C, and now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.26%th, Mn contents are 0.61%, Nb contents are 0.010%, 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, it is 0.0064% to control N content in 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 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% Nb, 0.020% P, 0.020% S, 0.0065% N, remaining is Fe and can not kept away
The other impurity exempted from.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 955 DEG C, and soaking temperature is 1000 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 882 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 345MPa, tensile strength 475MPa, and elongation is
36.0%, maximum, force percentage of total elongation is 18.0%, and 180 DEG C of clod washes are qualified, and the tissue of steel is ferrite+pearlite.
Embodiment 2
Certain steel plant is on 120 tons of (actual tap is in the range of 120~140 tons) bof processes of nominal capacity using this
Inventive technique produces Ribbed Bar for building, and production technology is to be blown into inert gas+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 0.055%.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, 0.015% P, 0.019% 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).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.90%, Mn content are that 1.30%, Nb contents are 0.050%, C content 0.29%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Core-spun yarn containing N is added using the method for line feeding after gas 4min, it is 0.0174% to control N content in 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 1540 DEG C during continuous casting,
The liquidus temperature of steel is 1495 DEG C, bag sampling analysis molten steel chemical constituent is 0.29% in conticaster C, 0.95%
Si, 1.30% Mn, 0.050% Nb, 0.017% P, 0.017% S, 0.0175% N, remaining is Fe and can not kept away
The other impurity exempted from.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 1218 DEG C, and soaking temperature is 1195 DEG C, and total heat time, which reaches to come out of the stove after 91min, is rolled
System.
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 960 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 505MPa, tensile strength 680MPa, and elongation is
19.0%, maximum, force percentage of total elongation is 11.00%, and 180 DEG C of clod washes are qualified, and 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 0.055%.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, 0.025% P, 0.020% 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).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.58%, Mn content are that 1.02%, Nb contents are 0.025%, C content 0.24%.
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, it is 0.0125% to control N content in 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 1550 DEG C during continuous casting,
The liquidus temperature of steel is 1505 DEG C, bag sampling analysis molten steel chemical constituent is 0.24% in conticaster C, 0.62%
Si, 1.03% Mn, 0.025% Nb, 0.026% P, 0.021% S, 0.0120% N, remaining is Fe and can not kept away
The other impurity exempted from.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 1120 DEG C, and soaking temperature is 1050 DEG C, and total heat time, which reaches to come out of the stove after 100min, is rolled
System.
It is corresponding to adjust roughing and finish rolling using final adjustment laying temperature as 925 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 430MPa, tensile strength 595MPa, and elongation is
21.00%, maximum, force percentage of total elongation is 15.0%, and 180 DEG C of clod washes are qualified, and 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 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 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 0.055%.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, 0.020% P, 0.022% 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).FeSi, FeMn, FeNb are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Nb and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Nb contents are 65% in 82%, FeNb alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.58%, Mn content are that 0.86%, Nb contents are 0.015%, C content 0.18%.
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, it is 0.0100% to control N content in 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 0.17% in conticaster C, 0.62%
Si, 0.86% Mn, 0.015% Nb, 0.022% P, 0.021% S, 0.0098% N, remaining is Fe and can not kept away
The other impurity exempted from.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 1150 DEG C, and soaking temperature is 1060 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 910 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 430MPa, tensile strength 595MPa, and elongation is
23.0%, maximum, force percentage of total elongation is 16.0%, and 180 DEG C of clod washes are qualified, and the tissue of steel is ferrite+pearlite.
Claims (9)
1. microalloy containing Nb builds steel wire rod, it is characterised in that：Chemical composition is：By weight percentage, C：0.15~
0.30%th, Si：0.30~1.00%, Mn：0.60~1.30%, N：0.0060~0.0180%, P≤0.040%, S≤
0.040%th, Nb：0.010~0.050%, surplus is Fe and inevitable impurity.
2. the production method of the building steel wire rod of microalloy containing Nb described in claim 1, it is characterised in that：Comprise 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 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%, Nb：0.010~0.050%, surplus is Fe and inevitable impurity；
The billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and soaking total time
90~120min；Laying head process in the high-speed rod-rolling mill, it is 880~960 DEG C to control laying temperature；It is described to be cooled to
600~700 DEG C are cooled to 4~8 DEG C/s cooling velocity first, then 400 are cooled to 2~3 DEG C/s cooling velocity~
500 DEG C, finally it is cooled to 150~300 DEG C with 0.5~1.0 DEG C/s cooling velocity.
3. the production method of the building of microalloy containing Nb steel wire rod according to claim 2, it is characterised in that：Including following step
Suddenly：
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%, Nb is 0.010~0.050%；
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 of microalloy containing Nb steel wire rod according to claim 3, it is characterised in that：In step a, institute
State molten iron requirement S content≤0.06%.
5. the production method of the building of microalloy containing Nb steel wire rod according to claim 3, it is characterised in that：In step a, institute
State FeSi and FeMn alloy FeSiMn alloy replacings.
6. the production method of the building of microalloy containing Nb steel wire rod according to claim 3, it is characterised in that：In step b, institute
The inert gas stated is at least one of argon gas or nitrogen.
7. the production method of the building of microalloy containing Nb steel wire rod according to claim 3, it is characterised in that：In step b, institute
State the time >=2min for being blown into inert gas.
8. the production method of the building of microalloy containing Nb steel wire rod according to claim 3, it is characterised in that：In step b, go out
Temperature of standing is higher than 60~90 DEG C of the liquidus temperature of steel.
9. the production method of the building of microalloy containing Nb steel wire rod according to claim 3, it is characterised in that：In step d, institute
The specification for stating pole wire rod or screw wire rod is
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107955908A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Nb builds steel wire rod and its LF stove production methods |
| CN109554624A (en) * | 2018-12-12 | 2019-04-02 | 张家港宏昌钢板有限公司 | 400MPa grades of reinforcing bars of Nb, N complex intensifying and its manufacturing method |
| CN109609846A (en) * | 2018-12-18 | 2019-04-12 | 邯郸钢铁集团有限责任公司 | 400MPa grades of high nitrogen combined microalloying reinforcing bars and its production method |
| CN111235478A (en) * | 2020-03-16 | 2020-06-05 | 阳春新钢铁有限责任公司 | Low-niobium HRB400E coiled steel and production method thereof |
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Application publication date: 20180320 |