CN107955918A - Steel bar and its LF stove production methods are built containing V, Cr microalloy - Google Patents
Steel bar and its LF stove production methods are built containing V, Cr microalloy Download PDFInfo
- Publication number
- CN107955918A CN107955918A CN201711243833.0A CN201711243833A CN107955918A CN 107955918 A CN107955918 A CN 107955918A CN 201711243833 A CN201711243833 A CN 201711243833A CN 107955918 A CN107955918 A CN 107955918A
- Authority
- CN
- China
- Prior art keywords
- steel
- microalloy
- production methods
- stove
- ladle
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to field of steel metallurgy, and in particular to one kind is containing V, 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 present invention provides one kind containing V, 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%, V:0.010%~0.160%, 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 method of the present invention is easy to operate, and nitrogen recovery rate is high and stablizes, 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 V, Cr microalloy building steel bar and its production of LF stoves
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 usually to add minimal amount for micro alloyed steel under the conditions of the 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 under normal circumstances
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, is 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 again high containing vanadium and nitrogen content, for micro-alloying technology route different in micro alloyed steel, compound micro- conjunction is particularly
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 solution be：There is provided it is a kind of containing V, Cr microalloy building steel bar and its
LF stove production methods.
The present invention provides a kind of V, Cr microalloy that contains and builds 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%, V:0.010%~0.160%, Cr:0.10%~0.60%, surplus is for Fe and inevitably
Impurity.
Present invention also offers a kind of LF stove production methods of the above-mentioned building steel bar containing V, Cr microalloy, 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 component 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%, V:0.010%~0.160%,
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 V, 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%, when liquid steel temperature >=1650 DEG C, tap；
Tap 1/3-2/3 when, add FeSi, FeMn, FeCr and carburant, FeV or VN alloys, control C be 0.15%~
0.30%th, Si be 0.30%~1.00%, Mn be 0.60%~1.30%, Cr be 0.10%~0.60%, V be 0.010%~
0.160%；
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
Be electrically heated after stove, core-spun yarn fed in ladle after the refining of LF stoves, control in molten steel N content be 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
The square billet of~200mm × 200mm, 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 V, Cr microalloy, molten iron described in step a requires S
Content≤0.035%.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Cr microalloy, FeSi and FeMn described in step a
Alloy FeSiMn alloy replacings.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Cr microalloy, the inert gas described in step b
For one kind in argon gas or nitrogen.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Cr microalloy, indifferent gas is blown into described in step b
The time of body >=2min.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Cr microalloy, step b electrical heating temperatures are higher than liquid
60~90 DEG C of liquidus temperature.
Wherein, in the LF stove production methods of the above-mentioned building steel bar containing V, Cr microalloy, pole or with ribbing described in step d
The specification of reinforcing bar is
Beneficial effects of the present invention are：
The present invention builds steel bar by designing a kind of microalloy containing V, Cr, and alloying component V is added in steel:
0.010%~0.160%, 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 easy to operate, and nitrogen recovery rate is high and stablizes, moreover it is possible to effectively reduces production cost, is worth of widely use.
Embodiment
It is containing V, Cr microalloy building steel bar, its chemical composition the present 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%, V:0.010%~0.160%, Cr:0.10%~0.60%, surplus is for Fe and inevitably
Impurity.
The present invention adds 0.010%~0.160% V primarily to fixing in steel 0.0060%~0.0180% N,
So as to ensure the aging performance of steel.When using converter smelting steel under normal circumstances, the residual nitrogen content in final finished steel exists
In the range of 0.0030%~0.0065%, using electric furnace smelting steel, residual nitrogen content is then in 0.0050%~0.0085% scope
It is interior.As N content raises in steel, timeliness is deteriorated therewith, side that is of the invention then using the V for adding 0.010%~0.160%
Formula, to ensure the timeliness of steel, while can also give full play to the solution strengthening effect of nitrogen, 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 V (C, N) particle, so as to promote the precipitation of V, can more fully plays the precipitation strength and crystal grain of titanium
Refining effect, to improve the comprehensive mechanical property of steel, on the premise of equal mechanical property, can reduce the usage amount of V.
Present invention also offers a kind of LF stove production methods of the building steel bar containing V, Cr microalloy, 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, the function of C 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 when tapping temperature is not less than 1650 DEG C taps
Into ladle；
The FeSi alloys containing Si elements are added in tapping process, the FeMn alloys containing Mn elements, contain Cr elements
FeCr, the alloy containing V element, and carbon dust or anthracite etc. increase C, and control C is in the range of 0.15%~0.30%, control Si
In the range of 0.30%~1.00%, Mn is in the range of 0.60%~1.30% for control, and Cr is in 0.10%~0.60% model for control
In enclosing, V is in the range of 0.010%~0.160% for control；Tap 1/3 when be initially added into FeSi, FeMn, FeCr and FeV or
VN alloys, 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 is blown
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, sampling carries out N content in molten steel and detects, and bag containing N is added using the method for line feeding according to testing result
Cored wire, the core-spun yarn containing N be mainly alloy containing N, such as SiN, control molten steel in N content in 0.0060%~0.0180% model
In enclosing, if N content control is relatively stable in molten steel after LF stove heats, it can not sample and carry out N content detection, be fed directly into cored
Line；
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and be blown into ability after inert gas
The core-spun yarn containing N is fed, inert gas can be argon gas or nitrogen, when being blown into inert gas after the completion of line feeding
Between also need extend 2min, to ensure the uniformity of N element in molten steel；
D, it is casting continuously to form steel billet
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, which is realized by above-mentioned LF stoves electrical heating；
The steel billet section that molten steel is casting continuously to form is the square billet of 150mm × 150mm~200mm × 200mm, 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 heating 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 heating 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, is rolled into using continous way rolling bar production lineCircle
Rod 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 V, Cr microalloy building steel bar with the method for the present invention
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 0.059%.Molten iron and useless
After steel adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.05% C, 0.025% P, 0.029% S, tapping is into ladle when temperature is 1678 DEG C, and actual tap is at this time
134 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Cr, V and C element alloying, wherein Si contents are closed for 74%, FeMn in the FeSi alloys added
Mn contents are that Cr contents are that V content is 78% in 54%, FeV alloys in 82%, FeCr alloys in gold, and fixing C in anthracite is
92%, control in molten steel that Si contents are 0.30%, Mn contents are 0.60%, Cr contents are 0.10%, V content 0.011%, 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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1575 DEG C
Cored wire, it is 0.0060% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent to conticaster to cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1538 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis molten steel chemical constituent is 0.15% in conticaster C, 0.31%
Si, 0.61% Mn, 0.10% Cr, 0.011% V, 0.038% P, 0.029% S, 0.0064% N, remaining is
Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to continous way production line of bar and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1213 DEG C, and soaking temperature is 1187 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 951 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 364MPa, tensile strength 479MPa, elongation are
37.0%th, maximum, force percentage of total elongation is 16.7%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation process, C that the chemical constituent after preparation is 0.16%,
0.31% Si, 0.61% Mn, 0.03% Cr, 0.011% V, 0.037% P, 0.028% S, 0.0061%
N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 345MPa, tensile strength 451MPa, elongation 37.3%, maximum, force percentage of total elongation are 17.4%, 180
DEG C clod wash qualification.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 96.9% to rate of corrosion, corrosion test shows that steel of the present invention has certain corrosion resistance.
1 corrosion resisting property inspection result of table
Embodiment 2 is prepared containing V, Cr microalloy building steel bar with the method for the present invention
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 0.054%.Molten iron and useless
After steel adds converter, the function of C is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.12% C, 0.018% P, 0.027% S, tapping is into ladle when temperature is 1687 DEG C, and actual tap is at this time
131 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Cr, V and C element alloying, wherein Si contents are closed for 74%, FeMn in the FeSi alloys added
Mn contents are that Cr contents are that V content is 78% in 54%, FeV alloys in 82%, FeCr alloys in gold, and fixing C in anthracite is
92%, control in molten steel that Si contents are 0.95%, Mn contents are 1.29%, Cr contents are 0.58%, V content 0.155%, C
Content is 0.30%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Gas 4min, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1573 DEG C
Cored wire, it is 0.0160% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent to conticaster to cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1522 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, 0.98%
Si, 1.29% Mn, 0.58% Cr, 0.156% V, 0.029% P, 0.025% S, 0.0165% N, remaining is
Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to continous way production line of bar and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1037 DEG C, and soaking temperature is 1011 DEG C, and total heating 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 573MPa, tensile strength 737MPa, elongation are
17.5%th, maximum, force percentage of total elongation is 12.0%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation process, C that the chemical constituent after preparation is 0.30%,
0.97% Si, 1.28% Mn, 0.03% Cr, 0.157% V, 0.034% P, 0.024% S, 0.0164%
N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 537MPa, tensile strength 703MPa, elongation 17.6%, maximum, force percentage of total elongation are 12.4%, 180
DEG C clod wash qualification.The tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 2, steel of the present invention relative to compared steel phase
It is 92.4% to rate of corrosion, corrosion test shows that steel of the present invention has certain corrosion resistance.
2 corrosion resisting property inspection result of table
Embodiment 3 is prepared containing V, Cr microalloy building steel bar with the method for the present invention
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 0.051%.Molten iron and useless
After steel adds converter, the function of C 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, 0.029% S, tapping is into ladle when temperature is 1688 DEG C, and actual tap is at this time
132 tons (about 5% raw material is burnt in converter steelmaking process).FeSi, FeMn, FeV are added in tapping process into molten steel to close
Gold and anthracite carry out Si, Mn, Cr, V and C element alloying, wherein Si contents are closed for 74%, FeMn in the FeSi alloys added
Mn contents are that Cr contents are that V content is 78% in 54%, FeV alloys in 82%, FeCr alloys in gold, and fixing C in anthracite is
92%, control in molten steel that Si contents are 0.65%, Mn contents are 0.98%, Cr contents are 0.40%, V content 0.085%, C
Content is 0.20%.
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, makes all kinds of alloys of addition fully melt and uniformly.
Molten steel is electrically heated after reaching LF stoves, and bag containing N is added using the method for line feeding when liquid steel temperature reaches 1580 DEG C
Cored wire, it is 0.0111% to control N content in molten steel.Before feeding core-spun yarn, steel ladle need to connect the pipe for being blown into inert gas again
Road, and nitrogen is blown into, extend after the completion of line feeding and be blown into nitrogen time 2min, to ensure the uniformity of N element in molten steel.Then
Molten steel is sent to conticaster to cast.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1541 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, 0.67%
Si, 0.98% Mn, 0.40% Cr, 0.080% V, 0.034% P, 0.026% S, 0.0135% N, remaining is
Fe and inevitable other impurity.Casting blank stacking cooled to room temperature.
Sent after slab cooling to continous way production line of bar and heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1130 DEG C, and soaking temperature is 1111 DEG C, and total heating time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 908 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 461MPa, tensile strength 594MPa, elongation are
22.7%th, maximum, force percentage of total elongation is 15.4%, 180 DEG C of clod wash qualifications.The tissue of steel is ferrite+pearlite.
Using the compared steel of preparation identical with above-mentioned preparation process, C that the chemical constituent after preparation is 0.20%,
0.68% Si, 0.98% Mn, 0.03% Cr, 0.081% V, 0.033% P, 0.026% S, 0.0130%
N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 432MPa, tensile strength 582MPa, elongation 23.0%, maximum, force percentage of total elongation are 15.5%, 180
DEG C clod wash qualification.The tissue of steel is ferrite+pearlite.
Compared steel and steel of the present invention are subjected to corrosion test under conditions of table 3, steel of the present invention relative to compared steel phase
It is 94.9% to rate of corrosion, corrosion test shows that steel of the present invention has certain corrosion resistance.
3 corrosion resisting property inspection result of table
Claims (9)
1. containing V, 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%, V:0.010%~0.160%, Cr:0.10%~0.60%, surplus is Fe and inevitable impurity.
2. the LF stove production methods of the building steel bar containing V, Cr microalloy described in claim 1, it is characterised in that including following
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 component 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%, V:0.010%~0.160%, 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 V, Cr microalloy, it is characterised in that including
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%, when liquid steel temperature >=1650 DEG C, tap；
Tap 1/3-2/3 when, add FeSi, FeMn, FeCr and carburant, FeV or VN alloys, control C be 0.15%~
0.30%th, Si be 0.30%~1.00%, Mn be 0.60%~1.30%, Cr be 0.10%~0.60%, V be 0.010%~
0.160%；
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, core-spun yarn is fed in ladle after the refining of LF stoves, 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, the steel billet section that molten steel is casting continuously to form for 150mm × 150mm~
The square billet of 200mm × 200mm, 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 V, Cr microalloy, it is characterised in that：Step
Molten iron described in a requires S content≤0.035%.
5. the LF stove production methods of the building steel bar according to claim 3 containing V, Cr microalloy, it is characterised in that：Step
The FeSiMn alloy replacings of FeSi and FeMn alloys described in a.
6. the LF stove production methods of the building steel bar according to claim 3 containing V, Cr microalloy, it is characterised in that：Step
Inert gas described in 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 V, Cr microalloy, it is characterised in that：Step
Time >=2min of inert gas is blown into described in b.
8. the LF stove production methods of the building steel bar according to claim 3 containing V, Cr microalloy, it is characterised in that：Step
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 V, Cr microalloy, it is characterised in that：Step
The specification of pole described in d or Ribbed Bar is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711243833.0A CN107955918A (en) | 2017-11-30 | 2017-11-30 | Steel bar and its LF stove production methods are built containing V, Cr microalloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711243833.0A CN107955918A (en) | 2017-11-30 | 2017-11-30 | Steel bar and its LF stove production methods are built containing V, Cr microalloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107955918A true CN107955918A (en) | 2018-04-24 |
Family
ID=61962855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711243833.0A Pending CN107955918A (en) | 2017-11-30 | 2017-11-30 | Steel bar and its LF stove production methods are built containing V, Cr microalloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107955918A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107955903A (en) * | 2017-11-30 | 2018-04-24 | 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 V, Cr microalloy |
| CN113957325A (en) * | 2021-09-06 | 2022-01-21 | 包头钢铁（集团）有限责任公司 | Method for solving brittle failure of construction steel bar |
| CN116005068A (en) * | 2022-12-13 | 2023-04-25 | 江苏鸿泰钢铁有限公司 | High-strength deformed steel bar with yield strength of 600MPa |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 600 MPa-level anti-seismic twisted steel and manufacturing method thereof |
| CN107955903A (en) * | 2017-11-30 | 2018-04-24 | 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 V, Cr microalloy |
-
2017
- 2017-11-30 CN CN201711243833.0A patent/CN107955918A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 600 MPa-level anti-seismic twisted steel and manufacturing method thereof |
| CN107955903A (en) * | 2017-11-30 | 2018-04-24 | 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 V, Cr microalloy |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107955903A (en) * | 2017-11-30 | 2018-04-24 | 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 V, Cr microalloy |
| CN113957325A (en) * | 2021-09-06 | 2022-01-21 | 包头钢铁（集团）有限责任公司 | Method for solving brittle failure of construction steel bar |
| CN116005068A (en) * | 2022-12-13 | 2023-04-25 | 江苏鸿泰钢铁有限公司 | High-strength deformed steel bar with yield strength of 600MPa |
| CN116005068B (en) * | 2022-12-13 | 2024-07-12 | 江苏鸿泰钢铁有限公司 | High-strength deformed steel bar with yield strength of 600MPa |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| 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 | |
| CN107955906A (en) | Steel bar and its production method are built containing V, Nb microalloy | |
| CN107815603A (en) | Steel Bar and its LF stove production methods are built containing V, Nb, Cr microalloy | |
| CN107747047A (en) | Steel Bar and its production method are built containing Nb, Cr microalloy | |
| CN107747053A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy | |
| CN107955905A (en) | Microalloy containing V builds steel bar and its LF stove production methods | |
| CN107955911A (en) | Microalloy containing Nb builds steel bar and its LF stove production methods | |
| CN107974619A (en) | Microalloy containing V builds steel bar and its production method | |
| CN107815608A (en) | Microalloy containing Ti builds Steel Bar and its LF stove production methods | |
| CN107964630A (en) | Microalloy containing Ti builds steel bar and its production method | |
| CN107747046A (en) | Steel Bar and its production method are built containing V, Ti microalloy | |
| CN107955918A (en) | Steel bar and its LF stove production methods are built containing V, Cr microalloy | |
| CN107815525A (en) | Microalloy containing Nb builds steel wire rod and its production method | |
| CN107955904A (en) | Steel bar and its production method are built containing V, Nb, Ti microalloy | |
| CN107723605A (en) | Steel Bar and its LF stove production methods are built containing Ti, 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 | |
| CN107815604A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy | |
| CN107815601B (en) | Microalloy construction steel wire rod containing Nb and Cr and LF furnace production method thereof | |
| 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 | |
| CN107955910A (en) | Steel bar and its LF stove production methods are built containing V, Nb, 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 |
Application publication date: 20180424 |
|
| RJ01 | Rejection of invention patent application after publication |