CN107723605A - Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy - Google Patents
Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy Download PDFInfo
- Publication number
- CN107723605A CN107723605A CN201711239962.2A CN201711239962A CN107723605A CN 107723605 A CN107723605 A CN 107723605A CN 201711239962 A CN201711239962 A CN 201711239962A CN 107723605 A CN107723605 A CN 107723605A
- Authority
- CN
- China
- Prior art keywords
- steel
- microalloy
- production methods
- stove
- steel bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention belongs to field of steel metallurgy, and in particular to one kind is containing Ti, Cr microalloy building Steel Bar and its LF stove production methods.The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, the invention provides one kind containing Ti, Cr microalloy building Steel Bar 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%, Cr:0.10%~0.60%, 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 one kind is containing Ti, Cr microalloy building Steel Bar and its life of LF stoves
Production method.
Background technology
Micro alloyed steel is primarily referred to as adding certain either micro element of minimal amount in steel with regard to that can significantly improve performance
Steel, particularly improve steel intensity index.It is either micro- mainly generally to add minimal amount for micro alloyed steel under the conditions of prior art
Measure vanadium, niobium and titanium and obtain.The mechanism of action of microalloying is：After vanadium, niobium and titanium as trace element add molten steel, with steel
Carbon and nitrogen in liquid combine, and form carbon, nitrogen compound particle, i.e. V (C, N), Nb (C, N) and Ti (C, N) particle, these particles
There is certain precipitation strength and crystal grain refinement, 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：There is provided it is a kind of containing Ti, Cr microalloy building Steel Bar and
Its LF stove production method.
The present invention provides a kind of Ti, Cr microalloy that contains and builds 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%, Cr:0.10%~0.60%, surplus is for Fe and inevitably
Impurity.
It is including following present invention also offers a kind of LF stove production methods of the above-mentioned building Steel Bar containing Ti, Cr microalloy
Step：
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%, Cr:0.10%~0.60%, surplus is Fe and inevitable impurity.
Further, the LF stove production methods of the above-mentioned building Steel Bar containing Ti, Cr microalloy, comprise the following steps：
A, converter smelting
Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat 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, FeCr alloy and carburant are added, controls C as 0.15%~0.30%, Si
It is that 0.60%~1.30%, Cr is 0.10%~0.60% 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；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 Steel Bar containing Ti, Cr microalloy, molten iron described in step a requires S
Content≤0.035%.
Wherein, it is above-mentioned containing Ti, Cr microalloy building Steel Bar LF stove production methods in, FeSi described in step a and
FeMn alloys FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building Steel Bar containing Ti, Cr microalloy, the indifferent gas described in step b
Body is one kind in argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building Steel Bar containing Ti, Cr microalloy, inertia is blown into described in step b
The time of gas >=2min.
Wherein, in the LF stove production methods of the above-mentioned building Steel Bar containing Ti, Cr microalloy, step b electrical heating temperatures are higher than
60~90 DEG C of liquidus temperature.
Wherein, in the LF stove production methods of the above-mentioned building Steel Bar containing Ti, Cr microalloy, pole or band described in step d
The specification of rib reinforcement is
Beneficial effects of the present invention are：
The present invention builds Steel Bar by designing a kind of microalloy containing Ti, Cr, and alloying component Ti is added in steel:
0.010%~0.050%, then coordinate and steel grade N content is adjusted by the way of core-spun yarn containing N is fed after converter smelting, use
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.This hair
Bright 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.
Embodiment
It is containing Ti, Cr microalloy building Steel Bar, its chemical composition the invention provides one kind：By weight percentage,
C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N:0.0060%~0.0180%, P≤
0.040%th, S≤0.040%, Ti:0.010%~0.050%, Cr:0.10%~0.60%, surplus is for Fe and inevitably
Impurity.
The Ti 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, titanium 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 titanium
It is more prone to form Ti (C, N) particle, so as to promote Ti precipitation, can more fully plays the precipitation strength and crystalline substance of titanium
Grain refining effect, to improve the comprehensive mechanical property of steel, on the premise of equal mechanical property, can reduce the usage amount of titanium.
It is including following present invention also offers a kind of LF stove production methods of the above-mentioned building Steel Bar containing Ti, Cr microalloy
Step：
A, converter smelting
Molten iron and steel scrap are added in converter, it is desirable to which the molten iron S contents of addition are not more than 0.060%.Molten iron and steel scrap add
After entering converter, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, when molten steel composition is just refined to 0.05%
~0.15% C, P is no more than 0.025%, S is not more than 0.035%, and ladle is arrived in tapping when tapping temperature is not less than 1650 DEG C
In；
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, controls C in the range of 0.15%~0.30%, controls Si in the range of 0.30%~1.00%, control Mn exists
In the range of 0.60%~1.30%, Cr is in the range of 0.10%~0.60% for control.Require in addition that, start to add in tapping 1/3
Enter FeSi, FeMn, FeCr alloy, 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
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, the core-spun yarn containing N predominantly closes containing N
Gold, such as SiN, control molten steel in N content in the range of 0.0060%~0.0180%, if N contains in molten steel after LF stove heats
Amount control is relatively stable, can not sample and carry out N content detection, be 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, inert gas can be argon gas or nitrogen, when being blown into inert gas after the completion of line feeding
Between also need extend 2min, to ensure the uniformity of Ti and N element in molten steel；
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 is prepared containing Ti, Cr microalloy building Steel Bar 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 0.055%.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, 0.022% P, 0.032% S, tapping is into ladle when temperature is 1680 DEG C, and now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeCr are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Cr and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Cr contents are 54% in 82%, FeCr 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%, Cr contents are 0.10%, 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
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 1566 DEG C, controls in firm water
Ti contents are that Ti contents are 40% in 0.010%, 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 1548 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.16% in conticaster C, 0.32%
Si, 0.62% Mn, 0.11% Cr, 0.011% Ti, 0.020% P, 0.019% S, 0.0062% 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 1216 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 954 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 359MPa, tensile strength 460MPa, elongation are
36.3%th, maximum, force percentage of total elongation is 16.8%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation technology, C that the chemical constituent after preparation is 0.15%,
0.30% Si, 0.62%% Mn, 0.03% Cr, 0.012% Ti, 0.034% P, 0.027% S, 0.0063%
N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine the mechanical property of compared steel
For：ReL (Rp0.2) is 325MPa, tensile strength 451MPa, elongation 36.6%, maximum, force percentage of total elongation are 18.9%,
180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 1, steel of the present invention relative to compared steel phase
It is 97.0% to rate of corrosion, corrosion test shows that steel of the present invention has certain decay resistance.
The corrosion resisting property assay of table 1
Embodiment 2 is prepared containing Ti, Cr microalloy building Steel Bar 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
0.06% C, 0.020% P, 0.025% S, tapping is into ladle when temperature is 1681 DEG C, and now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeCr are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Cr and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Cr contents are 54% in 82%, FeCr alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.94%th, Mn contents are 1.27%, Cr contents are 0.57%, 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
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 1567 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 0.0171% 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 1534 DEG C during continuous casting,
The liquidus temperature of steel is 1495 DEG C, bag sampling analysis molten steel chemical constituent is 0.30% in conticaster C, 0.96%
Si, 1.28% Mn, 0.58% Cr, 0.048% Ti, 0.031% P, 0.020% S, 0.0177% 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 1027 DEG C, and soaking temperature is 1014 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 887 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 544MPa, tensile strength 720MPa, elongation are
20.6%th, maximum, force percentage of total elongation is 11.5%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation technology, C that the chemical constituent after preparation is 0.29%,
0.99% 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, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 542MPa, tensile strength 718MPa, elongation 20.6%, maximum, force percentage of total elongation are 11.6%, 180
DEG C clod wash is qualified, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 1, steel of the present invention relative to compared steel phase
It is 97.0% to rate of corrosion, corrosion test shows that steel of the present invention has certain decay resistance.
The corrosion resisting property assay of table 2
Embodiment 3 is prepared containing Ti, Cr microalloy building Steel Bar 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, 0.023% P, 0.025% S, tapping is into ladle when temperature is 1671 DEG C, and now actual tap is
133 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeCr are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Cr and C element alloying, wherein Si contents are 74%, FeMn alloys in the FeSi alloys added
Middle Mn contents are that Cr contents are 54% in 82%, FeCr alloys, and C is fixed in anthracite as 92%, control the Si contents in molten steel to be
0.64%th, Mn contents are 0.96%, Cr contents are 0.33%, C content 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 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 1568 DEG C, controls in firm water
Ti contents are that Ti contents are 40% in 0.033%, FeTi alloys.Core-spun yarn containing N is then added using the method for line feeding, controls steel
N content is 0.0117% 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 1539 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, 0.64%
Si, 0.98% Mn, 0.32% Cr, 0.033% Ti, 0.034% P, 0.021% S, 0.0123% 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 1140 DEG C, and soaking temperature is 1110 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 910 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 438MPa, tensile strength 606MPa, elongation are
26.1%th, maximum, force percentage of total elongation is 13.0%, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation technology, C that the chemical constituent after preparation is 0.20%,
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, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 541MPa, tensile strength 715MPa, elongation 20.5%, maximum, force percentage of total elongation are 11.7%, 180
DEG C clod wash is qualified, and 180 DEG C of clod washes are qualified.The tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 1, steel of the present invention relative to compared steel phase
It is 95.3% to rate of corrosion, corrosion test shows that steel of the present invention has certain decay resistance.
The corrosion resisting property assay of table 3
Claims (9)
1. containing Ti, Cr microalloy building 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%, Cr:0.10%~0.60%, surplus is Fe and inevitable impurity.
2. described in claim 1 containing Ti, Cr microalloy building Steel Bar LF stove production methods, it is characterised in that including with
Lower step：
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%, Cr:
0.10%~0.60%, surplus is Fe and inevitable impurity.
3. the LF stove production methods of the building Steel Bar according to claim 2 containing Ti, Cr microalloy, it is characterised in that bag
Include following steps：
A, converter smelting
Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat 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, FeCr alloy and carburant, to control C be 0.15%~0.30%, Si is
0.30%~1.00%, Mn are that 0.60%~1.30%, Cr is 0.10%~0.60%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle；Molten steel
Bag is electrically heated after reaching LF stoves, adds FeTi alloys, and it is 0.010%~0.050% to control Ti, adds core-spun yarn containing N, control
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 LF stove production methods of the building Steel Bar according to claim 3 containing Ti, Cr microalloy, it is characterised in that：Step
Molten iron requires S content≤0.035% described in rapid a.
5. the LF stove production methods of the building Steel Bar according to claim 3 containing Ti, Cr microalloy, it is characterised in that：Step
FeSi and FeMn alloys FeSiMn alloy replacings described in rapid a.
6. the LF stove production methods of the building Steel Bar according to claim 3 containing Ti, Cr microalloy, it is characterised in that：Step
Inert gas described in rapid b is one kind in argon gas or nitrogen.
7. the LF stove production methods of the building Steel Bar according to claim 3 containing Ti, Cr microalloy, it is characterised in that：Step
Time >=2min of inert gas is blown into described in rapid b.
8. the LF stove production methods of the building Steel Bar according to claim 3 containing Ti, Cr microalloy, it is characterised in that：Step
Rapid b electrical heating temperatures are higher than 60~90 DEG C of liquidus temperature.
9. the LF stove production methods of the building Steel Bar according to claim 3 containing Ti, Cr microalloy, it is characterised in that：Step
The specification of pole or Ribbed Bar is described in rapid d
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711239962.2A CN107723605A (en) | 2017-11-30 | 2017-11-30 | Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711239962.2A CN107723605A (en) | 2017-11-30 | 2017-11-30 | Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107723605A true CN107723605A (en) | 2018-02-23 |
Family
ID=61220734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711239962.2A Pending CN107723605A (en) | 2017-11-30 | 2017-11-30 | Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107723605A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747058A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its production method are built containing Ti, Cr microalloy |
| 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 |
| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103003462A (en) * | 2010-07-20 | 2013-03-27 | 新日铁住金株式会社 | Rolled steel bar or wire for hot forging |
| CN202968665U (en) * | 2012-11-29 | 2013-06-05 | 湖北上大模具材料科技有限公司 | Core-spun yarn for nitrogen alloying |
| CN103255349A (en) * | 2013-04-26 | 2013-08-21 | 江苏省沙钢钢铁研究院有限公司 | Small-size 600MPa-level aseimatic twisted steel and manufacturing method thereof |
-
2017
- 2017-11-30 CN CN201711239962.2A patent/CN107723605A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103003462A (en) * | 2010-07-20 | 2013-03-27 | 新日铁住金株式会社 | Rolled steel bar or wire for hot forging |
| CN202968665U (en) * | 2012-11-29 | 2013-06-05 | 湖北上大模具材料科技有限公司 | Core-spun yarn for nitrogen alloying |
| CN103255349A (en) * | 2013-04-26 | 2013-08-21 | 江苏省沙钢钢铁研究院有限公司 | Small-size 600MPa-level aseimatic twisted steel and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747058A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its production method are built containing Ti, Cr microalloy |
| 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 |
| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102703811B (en) | Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof | |
| CN102703812B (en) | Titanium microalloyed 500-MPa high-strength steel bar and production method thereof | |
| CN107955919A (en) | Steel bar and its LF stove production methods are built containing V, Nb microalloy | |
| CN107815603A (en) | Steel Bar and its LF stove production methods are built containing V, Nb, Cr microalloy | |
| CN107955906A (en) | Steel bar and its production method are built containing V, Nb microalloy | |
| CN107747053A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy | |
| CN107747047A (en) | Steel Bar and its production method are built containing Nb, Cr microalloy | |
| CN107815608A (en) | Microalloy containing Ti builds Steel Bar and its LF stove production methods | |
| CN107955911A (en) | Microalloy containing Nb builds steel bar and its LF stove production methods | |
| CN107955905A (en) | Microalloy containing V builds steel bar and its LF stove production methods | |
| CN107747046A (en) | Steel Bar and its production method are built containing V, Ti microalloy | |
| CN107964630A (en) | Microalloy containing Ti builds steel bar and its production method | |
| CN107974619A (en) | Microalloy containing V builds steel bar and its production method | |
| CN107723605A (en) | Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy | |
| CN107815525A (en) | Microalloy containing Nb builds steel wire rod and its production method | |
| CN107955918A (en) | Steel bar and its LF stove production methods are built containing V, Cr microalloy | |
| CN107815609A (en) | Steel Bar and its LF stove production methods are built containing Nb, Cr microalloy | |
| CN107815526A (en) | Microalloy containing Nb builds Steel Bar and its production method | |
| CN107815601A (en) | Steel wire rod and its LF stove production methods are built containing Nb, Cr microalloy | |
| CN107955904A (en) | Steel bar and its production method are built containing V, Nb, Ti microalloy | |
| CN107815604A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy | |
| CN107955913A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb, Cr microalloy | |
| CN107747059A (en) | Steel wire rod and its production method are built containing V, Ti, Cr microalloy | |
| CN107955899A (en) | Steel wire rod and its production method are built containing V, Nb microalloy | |
| CN107955915A (en) | Steel bar and its LF stove production methods are built containing V, Ti microalloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180223 |