CN107815526A - Microalloy containing Nb builds Steel Bar and its production method - Google Patents
Microalloy containing Nb builds Steel Bar and its production method Download PDFInfo
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- CN107815526A CN107815526A CN201711243902.8A CN201711243902A CN107815526A CN 107815526 A CN107815526 A CN 107815526A CN 201711243902 A CN201711243902 A CN 201711243902A CN 107815526 A CN107815526 A CN 107815526A
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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 the building Steel Bar 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 Bar of microalloy containing Nb and its production method.The constituent of the bar 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 the building Steel Bar 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, can significantly improve the intensity of steel.
It will thus be seen that the effect of actually micro alloyed steel vanadium, niobium and titanium is inseparable with nitrogen, but generally
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%, in most cases.The effect of vanadium, niobium and titanium is such as given full play to, is to have to volume
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 in the production of micro alloyed steel, almost all use is
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.General feelings
The ratio of three trade mark nitrogen and vanadium is substantially stationary under condition, respectively 12：78(N:V)；14：78(N:V)；16：78(N:
V), i.e. the ratio of nitrogen and vanadium is up to the 16 of VN16：78, i.e., containing 16% N in alloy, contain 78% vanadium.Alloy of vanadium nitride
Although not only containing vanadium and nitrogen content but also high, for micro-alloying technology route different in micro alloyed steel, particularly compound micro- conjunction
Jin Gang, such as V-Ti-N, even 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 accurately controls nitrogen content by the way of nitrogenous core-spun yarn is added,
Nitrogen recovery rate is high.
The present invention solve above-mentioned technical problem technical scheme be：A kind of building Steel Bar of microalloy containing Nb and its life are provided
Production method.
The present invention provides a kind of building of microalloy containing Nb Steel Bar, and 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%th, S≤0.040%, Nb:0.010%~0.050%, surplus is Fe and inevitable impurity.
Present invention also offers a kind of production method of the above-mentioned building of microalloy containing Nb Steel Bar, comprise the following steps：
It is blast-melted that steel billet is made through converter smelting, continuous casting；Steel billet is heated, continous way rolling bar production line is rolled into
Pole or Ribbed Bar is made in material, cooling；Core-spun yarn adjustment N, heating steel billet temperature are fed in the ladle of chain-wales wherein after stove
Degree control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；Institute
Stating steel billet composition is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~
1.30%th, N:0.0060%~0.0180%, P≤0.040%, S≤0.040%, Nb:0.010%~0.050%, surplus is
Fe and inevitable impurity.
Further, the production method of the above-mentioned building of microalloy containing Nb Steel Bar, 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 molten steel C content for 0.05%~
0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
During tapping 1/3-2/3, FeSi, FeMn, FeNb alloy and carburant are added, controls C as 0.15%~0.30%, Si
It is that 0.60%~1.30%, Nb is 0.010%~0.050% for 0.30%~1.00%, Mn；
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, adds cored containing N
Line, it is 0.0060%~0.0180% to control N content in molten steel；
C, continuous casting
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the steel billet section that molten steel is casting continuously to form is 150mm × 150mm
~200mm × 200mm square billet, is air-cooled to room temperature；
D, heating steel billet and rolling
Billet heating temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, and heating and soaking are total
Time is 90~120min, and pole or Ribbed Bar are rolled into using continous way rolling bar production line.
Wherein, in the production method of the above-mentioned building of microalloy containing Nb Steel Bar, the requirement S of molten iron described in step a contents≤
0.060%.
Wherein, in the production method of the above-mentioned building of microalloy containing Nb Steel Bar, 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 Bar, the inert gas described in step b is argon gas
Or one kind in nitrogen.
Wherein, in the production method of above-mentioned microalloy containing Nb building Steel Bar, 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 Bar, 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 above-mentioned microalloy containing Nb building Steel Bar, pole described in step d or Ribbed Bar
Specification is
Beneficial effects of the present invention are：
The present invention builds Steel Bar by designing a kind of microalloy containing Nb, and alloying component Nb is added in steel:0.010%
~0.050%, then coordinate and adjust steel grade N content by the way of core-spun yarn containing N is fed after converter smelting, using rolling bar
Production line rolls, and the microalloy building Steel Bar that a kind of intensity is high, nitrogen recovery rate is high can finally be prepared.The inventive method is grasped
Make simple, nitrogen recovery rate is high and stably, moreover it is possible to effectively reduces production cost, is worth of widely use.
Embodiment
The invention provides a kind of building of microalloy containing Nb Steel Bar, 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%th, S≤0.040%, Nb:0.010%~0.050%, surplus is Fe and inevitable impurity.
The Nb that the present invention adds 0.010%~0.050% is primarily to 0.0060%~0.0180% in fixed steel
N, so as to ensure the aging performance of steel.When generally using 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.It is ageing to be deteriorated therewith as N content raises in steel, niobium that is of the invention then using addition 0.010%~0.050%
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 intensity of steel,
Reduce the cost of alloy of steel.
In addition, in above-mentioned chemical composition, because the nitrogen content in molten steel is higher than residual nitrogen content in usual steel, 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, on the premise of equal mechanical property, can reduce the usage amount of niobium.
Present invention also offers a kind of production method of the above-mentioned building of microalloy containing Nb Steel Bar, comprise the following steps：
A, 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, the FeMn alloys containing Mn elements are added in tapping process, and contains Nb members
The alloy and carburant of element, the carburant are C powder or anthracite, and control C is in the range of 0.15%~0.30%, control Si exists
In the range of 0.30%~1.00%, Mn is in the range of 0.60%~1.30% for control, and Nb is in 0.010%~0.050% model for control
In enclosing.Require in addition that, be initially added into FeSi, FeMn and FeNb alloy in tapping 1/3, 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；
B, 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 add core-spun yarn containing N, the core-spun yarn containing N predominantly alloy containing N, such as SiN, control molten steel in N content 0.0060%
In the range of~0.0180%；If relatively stable can not sample of N content control carries out N content detection in molten steel after stove, directly feed
Enter core-spun yarn；
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；
C, 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；
D, heating steel billet and rolling
Heating requirements total heat time of steel billet is 90~120min, and heating furnace maximum heating temperature is 1220 DEG C, highest
Soaking temperature is 1200 DEG C, and steel billet goes out the temperature control of heating furnace in the range of 1000~1200 DEG C；
Final finished specification isPole, or have and defined in GB 1499.2
Ribbed Bar external formWith Ribbed Bar for building, can be entered using continous way rolling bar production line
Row rolling.
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 prepares the building Steel Bar of microalloy containing Nb with the inventive method
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
The stream billet caster of machine 6 is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled 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 0.055%.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
0.06% C, 0.023% P, 0.031% S, tapping is into ladle when temperature is 1675 DEG C, and now actual tap is
137 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
0.30%th, Mn contents are 0.60%, 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, N content is 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
Liquid steel temperature is adjusted, carries out thermometric before outbound again, liquid steel temperature is outbound when being 1583 DEG C, and molten steel is sent into conticaster and carried out
Casting.
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 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.33%
Si, 0.63% Mn, 0.03% Cr, 0.010% Nb, 0.029% P, 0.018% S, 0.0066% N, remaining is
Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to continous way production line of bar after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1215 DEG C, and soaking temperature is 1176 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 957 DEG C, and natural air cooling is carried out after upper cold bed, is finally collected, bundling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 341MPa, tensile strength 445MPa, elongation are
37.3%th, maximum, force percentage of total elongation is 17.9%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Embodiment 2 prepares the building Steel Bar of microalloy containing Nb with the inventive method
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
The stream billet caster of machine 6 is cast into 200mm × 200mm steel billets → heating steel billet → continous way rolling bar production line and is rolled 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 0.054%.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
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1673 DEG C, and now actual tap is
135 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
0.95%th, Mn contents are 1.28%, Nb contents are 0.048%, 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, N content is 0.0175% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1573 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 1533 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, 0.98%
Si, 1.29% Mn, 0.03% Cr, 0.048% Nb, 0.025% P, 0.025% S, 0.0173% N, remaining is
Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to continous way production line of bar after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1125 DEG C, and soaking temperature is 1103 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 901 DEG C, and natural air cooling is carried out after upper cold bed, is finally collected, bundling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 531MPa, tensile strength 693MPa, elongation are
23.4%, maximum, force percentage of total elongation is 12.5%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Embodiment 3 prepares the building Steel Bar of microalloy containing Nb with the inventive method
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
The stream billet caster of machine 6 is cast into 200mm × 200mm steel billets → heating steel billet → continous way rolling bar production line and is rolled 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 0.049%.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
0.010% C, 0.022% P, 0.025% S, tapping is into ladle when temperature is 1668 DEG C, and now actual tap is
136 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
0.60%th, Mn contents are 0.96%, Nb contents are 0.030%, 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is 0.0125% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1588 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 1531 DEG C during continuous casting,
The liquidus temperature of steel is 1510 DEG C, bag sampling analysis molten steel chemical constituent is 0.21% in conticaster C, 0.61%
Si, 0.97% Mn, 0.03% Cr, 0.031% Nb, 0.025% P, 0.024% S, 0.0131% N, remaining is
Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to continous way production line of bar after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1127 DEG C, and soaking temperature is 1113 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 902 DEG C, and natural air cooling is carried out after upper cold bed, is finally collected, bundling.
The mechanical properties test result of steel is：ReL (Rp0.2) is 456MPa, tensile strength 591MPa, elongation are
26.3%th, maximum, force percentage of total elongation is 14.1%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Claims (9)
1. microalloy containing Nb builds Steel Bar, 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%, surplus is Fe and inevitable impurity.
2. the production method of the building Steel Bar 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, the rolling of continous way rolling bar production line is become a useful person,
Pole or Ribbed Bar is made in cooling；Core-spun yarn adjustment N, billet heating temperature control are fed in the ladle of chain-wales wherein after stove
950~1220 DEG C are made as, soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；The steel
Base 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 can not
The impurity avoided.
3. the production method of the building of microalloy containing Nb Steel Bar 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 molten steel C content for 0.05%~
0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
Tap 1/3-2/3 when, add FeSi, FeMn, FeNb alloy and carburant, to control C be 0.15%~0.30%, Si is
0.30%~1.00%, Mn are that 0.60%~1.30%, Nb is 0.010%~0.050%；
B, core-spun yarn is fed
It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle, 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, the steel billet section that molten steel is casting continuously to form be 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 soaking total time
For 90~120min, pole or Ribbed Bar are rolled into using continous way rolling bar production line.
4. the production method of the building of microalloy containing Nb Steel Bar according to claim 3, it is characterised in that：Institute in step a
State molten iron requirement S content≤0.060%.
5. the production method of the building of microalloy containing Nb Steel Bar according to claim 3, it is characterised in that：Institute in step a
State FeSi and FeMn alloy FeSiMn alloy replacings.
6. the production method of the building of microalloy containing Nb Steel Bar according to claim 3, it is characterised in that：Institute in step b
The inert gas stated is one kind in argon gas or nitrogen.
7. the production method of the building of microalloy containing Nb Steel Bar according to claim 3, it is characterised in that：Institute in step b
State the time >=2min for being blown into inert gas.
8. the production method of the building of microalloy containing Nb Steel Bar according to claim 3, it is characterised in that：Step b is outbound
Temperature 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 Bar according to claim 3, it is characterised in that：Institute in step d
The specification for stating pole or Ribbed Bar is
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