CN107815608A - Microalloy containing Ti builds Steel Bar and its LF stove production methods - Google Patents
Microalloy containing Ti builds Steel Bar and its LF stove production methods Download PDFInfo
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- CN107815608A CN107815608A CN201711243834.5A CN201711243834A CN107815608A CN 107815608 A CN107815608 A CN 107815608A CN 201711243834 A CN201711243834 A CN 201711243834A CN 107815608 A CN107815608 A CN 107815608A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (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 Ti 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, and the invention provides a kind of building Steel Bar of microalloy containing Ti and its LF stove production methods.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%, Ti:0.010%~0.050%, surplus is Fe and inevitable impurity.The key of its preparation method feeds core-spun yarn containing N, adjustment N to suitable level after being the refining of 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
Technical field
The invention belongs to field of steel metallurgy, and in particular to a kind of building Steel Bar of microalloy containing Ti and its LF stove producers
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 Ti and its LF are provided
Stove production method.
The present invention provides a kind of building of microalloy containing Ti 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%, Ti:0.010%~0.050%, surplus is Fe and inevitable impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, including following step
Suddenly:
It is blast-melted that steel billet is made through converter smelting, LF refining, continuous casting;Steel billet is heated, the production of continous way rolling bar
Line rolling becomes a useful person, cools down pole or Ribbed Bar is made;Core-spun yarn adjustment N, steel billet are wherein fed after the refining of LF stoves in ladle
Heating and temperature control be 950~1220 DEG C, soaking temperature control be 1000~1200 DEG C, heating and soaking total time 90~
120min;The steel billet 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%, Ti:0.010%~
0.050%, surplus is Fe and inevitable impurity.
Further, the LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, 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 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 and carburant, to control C be 0.15%~0.30%, Si 0.30%
~1.00%, Mn are 0.60%~1.30%;
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;Steel ladle reaches LF
It is electrically heated after stove, adds FeTi alloys, it is 0.010%~0.050% to control Ti, adds core-spun yarn containing N, is controlled in molten steel
N content is 0.0060%~0.0180%;
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 LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, molten iron described in step a requires that S contains
Amount≤0.060%.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, FeSi described in step a and FeMn are closed
Gold uses FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, the inert gas described in step b is
One kind in argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, inert gas is blown into described in step b
Time >=2min.
Wherein, in the LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, step b electrical heating temperatures are higher than liquid phase
60~90 DEG C of line temperature.
Wherein, in the LF stove production methods of above-mentioned microalloy containing Ti building Steel Bar, pole described in step d or with rib steel
The specification of muscle is
Beneficial effects of the present invention are:
The present invention builds Steel Bar by designing a kind of microalloy containing Ti, and alloying component Ti 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 Ti 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%, Ti:0.010%~0.050%, surplus is Fe and inevitable impurity.
The present invention adds 0.010%~0.050% Ti 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 content in final finished steel
In the range of 0.0030%~0.0065%, using electric furnace smelting steel, residual nitrogen content is then in 0.0050%~0.0085% model
In enclosing.It is ageing to be deteriorated therewith as N content raises in steel, Ti's 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, drop
The cost of alloy of low steel.
In addition, in above-mentioned chemical composition, because the nitrogen content in molten steel is higher than residual nitrogen content in usual steel, Ti addition
It is more prone to form Ti (C, N) particle, so as to promote Ti precipitation, can more fully plays Ti precipitation strength and crystalline substance
Grain refining effect, to improve the comprehensive mechanical property of steel, on the premise of equal mechanical property, can reduce Ti usage amount.
Present invention also offers a kind of LF stove production methods of the above-mentioned building of microalloy containing Ti Steel Bar, including following step
Suddenly:
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 is no more than 0.025%, S is not more than 0.035%, and taps when tapping temperature is not less than 1650 DEG C
Into ladle;The FeSi alloys containing Si elements, the FeMn alloys containing Mn elements, and carbon dust or nothing are added in tapping process
Bituminous coal etc. increases C, and control C is in the range of 0.15%~0.30%, control Si is in the range of 0.30%~1.00%;In tapping 1/3
When be initially added into FeSi, FeMn, FeCr alloy, tapping to when 2/3 to add;In the addition of above-mentioned alloy, it can also use and contain
The FeSiMn alloys for having Si and Mn replace FeSi and FeMn alloys;
B, inert gas is blown into after Converter
After the completion of tapping, after ladle arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle blows
Enter inert gas, the inert gas being blown into can be argon gas or nitrogen, be blown into the time of inert gas and should be not less than
2min;The blowing time of regulation inert gas is to ensure that molten steel has enough circulation time not less than 2min, can make to add
All kinds of alloys entered fully melt and uniformly;
C, 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, FeTi is added into ladle, it is 0.010%~0.050% to control the Ti contents in molten steel, then
Sampling carries out N content in molten steel and detected, and adds FeTi alloys, and Ti is in the range of 0.010%~0.050% for control;Subsequent root
Core-spun yarn containing N is added using the method for line feeding according to the testing result of N content in molten steel, N content is 0.0060% in control molten steel
In the range of~0.0180%, if N content control is relatively stable in molten steel after LF stove heats, it can not sample and carry out N content detection,
It is fed directly into core-spun yarn;
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, the core-spun yarn containing N is mainly alloy containing N, and such as SiN, inert gas can be argon gas, can also
It is nitrogen, being blown into the time of inert gas after the completion of line feeding also needs to extend 2min, to ensure that Ti's and N element in molten steel is uniform
Property;
D, 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 realized by above-mentioned LF stoves electrical heating;
The steel billet section that molten steel is casting continuously to form is 150mm × 150mm~200mm × 200mm square billet, the square billet less than 150mm × 150mm
Section is small to be unfavorable for working continuously for bof process, and the square billet section more than 200mm × 200mm can then extend follow-up rolling steel billet
When heat time;The steel billet that molten steel is casting continuously to form, naturally cools to room temperature in atmosphere;
E, heating steel billet and rolling
Heating requirements total heat time of steel billet is 90~120min, and heating and temperature control is 950~1220 DEG C, soaking temperature
Degree control is in the range of 1000~1200 DEG C;It is rolled into using continous way rolling bar production linePole
Or Ribbed Bar.
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 Ti 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 band for building and strangles reinforcing bar, production technology be blown into after converter smelting → stove inert gas → LF stoves electrical heating →
6 machines 6 stream billet caster is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoBand strangles reinforcing bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are 0.051%.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, 0.024% P, 0.031% 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).In tapping process into molten steel add FeSi, FeMn alloy and
Anthracite carries out Si, Mn and C element alloying, wherein Si contents are that Mn contains in 74%, FeMn alloys in the FeSi alloys added
Measure as 82%, C is fixed in anthracite as 92%, control in molten steel that Si contents are 0.30%, Mn contents are 0.60%, C content is
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
Gas 4min, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1569 DEG C, controls in firm water
Ti contents are that Ti contents are 40% in 0.011%, FeTi alloys.Core-spun yarn containing N is then added using the method for line feeding, controls steel
N content is 0.0061% in liquid.Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen
Gas, 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 to
Conticaster is cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1536 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.30%
Si, 0.62%% Mn, 0.03% Cr, 0.012% Ti, 0.034% P, 0.027% S, 0.0063% N, remaining
For 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 areBand strangle
Reinforcing bar.Slab heating temperature is 1215 DEG C, and soaking temperature is 1177 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 325MPa, tensile strength 451MPa, elongation are
36.6%th, maximum, force percentage of total elongation is 18.9%, 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 Ti 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 band for building and strangles reinforcing bar, production technology be blown into after converter smelting → stove inert gas → LF stoves electrical heating →
6 machines 6 stream billet caster is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoBand strangles reinforcing bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are 0.056%.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
0.08% C, 0.025% P, 0.033% S, tapping is into ladle when temperature is 1669 DEG C, and now actual tap is
136 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn alloy and
Anthracite carries out Si, Mn and C element alloying, wherein Si contents are that Mn contains in 74%, FeMn alloys in the FeSi alloys added
Measure as 82%, C is fixed in anthracite as 92%, control in molten steel that Si contents are 0.96%, Mn contents are 1.28%, C content is
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
Gas 5min, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1572 DEG C, controls in firm water
Ti contents are that Ti contents are 40% in 0.049%, FeTi alloys.Core-spun yarn containing N is then added using the method for line feeding, controls steel
N content is 0.0170% in liquid.Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen
Gas, 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 to
Conticaster is cast.
150mm × 150mm 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, 0.99%
Si, 1.28% Mn, 0.03% Cr, 0.048% Ti, 0.034% P, 0.028% S, 0.0176% 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 areBand strangle
Reinforcing bar.Slab heating temperature is 1025 DEG C, and soaking temperature is 1015 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 884 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 542MPa, tensile strength 718MPa, elongation are
20.6%th, maximum, force percentage of total elongation is 11.6%, 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 Ti 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 band for building and strangles reinforcing bar, production technology be blown into after converter smelting → stove inert gas → LF stoves electrical heating →
6 machines 6 stream billet caster is cast into 150mm × 150mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoBand strangles reinforcing bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are 0.058%.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
0.07% C, 0.020% P, 0.028% S, tapping is into ladle when temperature is 1678 DEG C, and now actual tap is
136 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn alloy and
Anthracite carries out Si, Mn and C element alloying, wherein Si contents are that Mn contains in 74%, FeMn alloys in the FeSi alloys added
Measure as 82%, C is fixed in anthracite as 92%, control in molten steel that Si contents are 0.63%, Mn contents are 0.97%, C content is
0.21%.
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
Gas 4min, all kinds of alloys of addition are made fully to melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and liquid steel temperature adds FeTi alloys when reaching 1574 DEG C, controls in firm water
Ti contents are that Ti contents are 40% in 0.032%, FeTi alloys.Core-spun yarn containing N is then added using the method for line feeding, controls steel
N content is 0.0113% in liquid.Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into nitrogen
Gas, 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 to
Conticaster is cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1542 DEG C during continuous casting,
The liquidus temperature of steel is 1510 DEG C, bag sampling analysis molten steel chemical constituent is 0.20% in conticaster C, 0.65%
Si, 0.96% Mn, 0.03% Cr, 0.031% Ti, 0.031% P, 0.026% S, 0.0121% 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 areBand strangle
Reinforcing bar.Slab heating temperature is 1130 DEG C, and soaking temperature is 1115 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 541MPa, tensile strength 715MPa, elongation are
20.5%th, maximum, force percentage of total elongation is 11.7%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Claims (9)
1. microalloy containing Ti 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%, Ti:0.010%~0.050%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building Steel Bar of microalloy containing Ti described in claim 1, it is characterised in that including following step
Suddenly:
It is blast-melted that steel billet is made through converter smelting, LF refining, continuous casting;Steel billet is heated, continous way rolling bar production line rolls
Material is made, pole or Ribbed Bar is made in cooling;Core-spun yarn adjustment N, heating steel billet are wherein fed after the refining of LF stoves in ladle
Temperature control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time;
The 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%, Ti:0.010%~0.050%, surplus is
Fe and inevitable impurity.
3. the LF stove production methods of microalloy containing Ti according to claim 2 building Steel Bar, it is characterised in that including with
Lower step:
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 alloy and carburant, to control C be 0.15%~0.30%, Si 0.30%
~1.00%, Mn are 0.60%~1.30%;
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
It is electrically heated, adds FeTi alloys, it is 0.010%~0.050% to control Ti, adds core-spun yarn containing N, controls N in molten steel to contain
Measure as 0.0060%~0.0180%;
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 LF stove production methods of the building of microalloy containing Ti Steel Bar according to claim 3, it is characterised in that:Step a
Described in molten iron require S content≤0.060%.
5. the LF stove production methods of the building of microalloy containing Ti Steel Bar according to claim 3, it is characterised in that:Step a
Described in FeSi and FeMn alloys FeSiMn alloy replacings.
6. the LF stove production methods of the building of microalloy containing Ti Steel Bar according to claim 3, it is characterised in that:Step b
Described in inert gas be one kind in argon gas or nitrogen.
7. the LF stove production methods of the building of microalloy containing Ti Steel Bar according to claim 3, it is characterised in that:Step b
Described in be blown into time >=2min of inert gas.
8. the LF stove production methods of the building of microalloy containing Ti Steel Bar according to claim 3, it is characterised in that:Step b
Electrical heating temperature is higher than 60~90 DEG C of liquidus temperature.
9. the LF stove production methods of the building of microalloy containing Ti Steel Bar according to claim 3, it is characterised in that:Step d
Described in the specification of pole or Ribbed Bar be
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CN107964630A (en) * | 2017-11-30 | 2018-04-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Ti builds steel bar and its production method |
CN109735682A (en) * | 2018-12-18 | 2019-05-10 | 邯郸钢铁集团有限责任公司 | The smelting process of high nitrogen 400MPa grades of screw-thread steels of composite alloy microalloying |
CN112281071A (en) * | 2020-10-31 | 2021-01-29 | 张家港荣盛特钢有限公司 | Economical 500 MPa-level steel bar and preparation method thereof |
CN113186457A (en) * | 2021-04-02 | 2021-07-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Titanium microalloying hot-rolled ribbed steel bar HRB400E and smelting method thereof |
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