CN107747047A - Steel Bar and its production method are built containing Nb, Cr microalloy - Google Patents
Steel Bar and its production method are built containing Nb, Cr microalloy Download PDFInfo
- Publication number
- CN107747047A CN107747047A CN201711243905.1A CN201711243905A CN107747047A CN 107747047 A CN107747047 A CN 107747047A CN 201711243905 A CN201711243905 A CN 201711243905A CN 107747047 A CN107747047 A CN 107747047A
- Authority
- CN
- China
- Prior art keywords
- steel
- microalloy
- production method
- bar
- billet
- 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
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (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 Nb, Cr microalloy building Steel Bar and its production method.The problems such as alloy of vanadium nitride nitrogen content is low, species is few is prepared selected by nitrogen-containing alloy steel for existing, the invention provides one kind containing Nb, Cr microalloy building Steel Bar and its production method.The constituent of the bar is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%, N:0.0060%~0.0180%, P≤0.040%, S≤0.040%, Nb:0.010%~0.050%, Cr:0.10%~0.60%, surplus is Fe and inevitable impurity.The key of its preparation method is that after stove chain-wales feed core-spun yarn containing N, adjustment N to suitable level.The inventive method is simple to operate, and nitrogen recovery rate is high and stably, moreover it is possible to effectively reduces production cost, is worth of widely use.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to one kind is containing Nb, Cr microalloy building Steel Bar and its producer
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 is made using nitrogen content in nitrogenous core-spun yarn adjustment microalloy is added
Standby micro alloyed steel nitrogen recovery rate is high, and cost is low.
The present invention solve above-mentioned technical problem technical scheme be：There is provided it is a kind of containing Nb, Cr microalloy building Steel Bar and
Its production method.
The present invention provides a kind of Nb, 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%, Nb:0.010%~0.050%, Cr:0.10%~0.60%, surplus is for Fe and inevitably
Impurity.
Present invention also offers a kind of production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, comprise the following steps：
It is blast-melted that steel billet is made through converter smelting, continuous casting；Steel billet is heated, continous way rolling bar production line is rolled into
Pole or Ribbed Bar is made in material, cooling；Core-spun yarn adjustment N, heating steel billet temperature are fed in the ladle of chain-wales wherein after stove
Degree control is 950~1220 DEG C, and soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；Institute
Stating steel billet composition is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~
1.30%th, N:0.0060%~0.0180%, P≤0.040%, S≤0.040%, Nb:0.010%~0.050%, Cr:
0.10%~0.60%, surplus is Fe and inevitable impurity.
Further, the production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, comprises the following steps：
A, converter smelting：Molten iron and steel scrap are added in converter, C is taken off using Converter Oxigen Blowing, is smelted, treat that molten steel C contains
Measure as 0.05%~0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
Tap 1/3-2/3 when, add FeSi, FeMn, FeCr, FeNb alloy and carburant, 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%, Nb be 0.010%~
0.050%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle,
Core-spun yarn containing N is added, it is 0.0060%~0.0180% to control N content in molten steel；
C, continuous casting：It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the steel billet section that molten steel is casting continuously to form is 150mm
× 150mm~200mm × 200mm square billet, is air-cooled to room temperature；
D, heating steel billet and rolling：Billet heating temperature control is 950~1220 DEG C, soaking temperature control for 1000~
1200 DEG C, heating and soaking total time are 90~120min, and pole or with ribbing is rolled into using continous way rolling bar production line
Reinforcing bar.
Wherein, in the production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, molten iron described in step a requires S contents
≤ 0.060%.
Wherein, in the production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, FeSi described in step a and FeMn are closed
Gold uses FeSiMn alloy replacings.
Wherein, in the production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, the inert gas described in step b is
One kind in argon gas or nitrogen.
Wherein, in the production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, inert gas is blown into described in step b
Time >=2min.
Wherein, in the production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, step b out-station temperatures are higher than the liquid of steel
60~90 DEG C of liquidus temperature.
Wherein, in the production method of the above-mentioned building Steel Bar containing Nb, Cr microalloy, 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 Nb, Cr, and alloying component Nb is added in steel:
0.010%~0.050%, Cr:0.10%~0.60%, then coordinate by the way of core-spun yarn containing N is fed after converter smelting
Adjust steel grade N content, rolled using rolling bar production line, it is micro- to be finally prepared that a kind of intensity is high, nitrogen recovery rate is high
Alloy builds Steel Bar.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
It must promote the use of.
Embodiment
It is containing Nb, 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%, Nb:0.010%~0.050%, Cr:0.10%~0.60%, surplus is for Fe and inevitably
Impurity.
The present invention adds 0.010%~0.050% Nb 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, niobium that is of the invention then using addition 0.010%~0.050%
Mode, to ensure the ageing of steel, while the solution strengthening effect of nitrogen can also be given full play to, so as to improve the intensity of steel, drop
The cost of alloy of low steel.
In order to ensure that mechanical property must be added to Nb, and it is in order to while performance is improved to add N, additionally it is possible to is more filled
Nb invigoration effect is waved in distribution, and to reduce Nb alloying cost, therefore, Nb will also be added by being not added with N, and Nb can be reduced after adding N
Addition.And Cr is added to be to improve corrosion resisting property.
In addition, in above-mentioned chemical composition, because the nitrogen content in molten steel is higher than residual nitrogen content in usual steel, the addition of niobium
It is more prone to form Nb (C, N) particle, so as to promote the precipitation of niobium, can more fully plays the precipitation strength and crystalline substance of niobium
Grain refining effect, to improve the comprehensive mechanical property of steel, on the premise of equal mechanical property, can reduce the usage amount of niobium.
Also containing 0.10%~0.60% Cr in the composition of steel of the present invention, Cr is the essential element for improving steel hardenability,
And steel substrate surface can be made to form the rusty scale of densification, slow down the corrosion of air or other corrosive mediums to weather-proof steel matrix, so as to
Improve the weatherability of weathering steel.Therefore the Cr for adding 0.10%~0.60% generates two beneficial works to construction(al)steel
With being that the Cr of addition 0.10%~0.60% can be such that the centre grain size of the construction(al)steel of big specification tends in edge first
Unanimously, next to that adding 0.10%~0.60%Cr construction(al)steel, even if being stored in for a long time in open-air atmosphere, led by air
Cause corrosion to lose the quantity of weight to be also less than without Cr construction(al)steels.
Present invention also offers a kind of production method of the above-mentioned building Steel Bar containing Nb, 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, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.05%~0.15% C, P are no more than 0.025%, S is not more than 0.035%, and tap when tapping temperature is not less than 1650 DEG C
Into ladle；
The FeSi alloys containing Si elements, the FeMn alloys containing Mn elements are added in tapping process, and contains Nb members
The alloy and carburant of element, the carburant are C powder or anthracite, and control C is in the range of 0.15%~0.30%, control Si exists
In the range of 0.30%~1.00%, Mn is in the range of 0.60%~1.30% for control, and Cr is in 0.10%~0.60% scope for control
Interior, Nb is in the range of 0.010%~0.050% for control.Require in addition that, FeSi, FeMn, FeCr are initially added into tapping 1/3
With FeNb 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 and feeds core-spun yarn
After the completion of tapping, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into inert gas, the inertia being blown into
Gas can be argon gas or nitrogen, be blown into the time of inert gas and should be not less than 2min；Regulation inert gas is blown into
Time is that all kinds of alloys that can make addition in order to ensure that molten steel has enough circulation time fully melt and not less than 2min
It is even；
The inert gas time is blown into more than after 2min, sampling carries out N content detection, and the side of line feeding is used according to assay
Method add core-spun yarn containing N, the core-spun yarn containing N predominantly alloy containing N, such as SiN, control molten steel in N content 0.0060%
In the range of~0.0180%；If relatively stable can not sample of N content control carries out N content detection in molten steel after stove, directly feed
Enter core-spun yarn；
Before feeding core-spun yarn, steel ladle need to connect the pipeline for being blown into inert gas again, and after the inert gas being blown into
The core-spun yarn containing N can be fed, inert gas can be argon gas or nitrogen, and inert gas is blown into after the completion of line feeding
Time also needs to extend more than 2min, to ensure the uniformity of N element in molten steel, and controls outbound liquid steel temperature；
Thermometric is carried out before outbound, it is ensured that out-station temperature is higher than 60~90 DEG C of the liquidus temperature of steel；
C, it is casting continuously to form steel billet
It is 20~50 DEG C to control the degree of superheat wrapped in conticaster, and the temperature is by outbound temperature after above-mentioned converter tapping and stove
Degree controls to realize；
The steel billet section that molten steel is casting continuously to form be 150mm × 150mm~200mm × 200mm square billet, less than 150mm ×
150mm square billet section is small to be unfavorable for working continuously for bof process, and the square billet section more than 200mm × 200mm can then extend
Heat time during follow-up rolling steel billet；
The steel billet that molten steel is casting continuously to form, naturally cools to room temperature in atmosphere；
D, heating steel billet and rolling
Heating requirements total heat time of steel billet is 90~120min, and heating furnace maximum heating temperature is 1220 DEG C, highest
Soaking temperature is 1200 DEG C, and steel billet goes out the temperature control of heating furnace in the range of 1000~1200 DEG C；
Final finished specification isPole, or have and defined in GB 1499.2
Ribbed Bar external formWith Ribbed Bar for building, can be entered using continous way rolling bar production line
Row rolling.
Explanation will be further explained to the embodiment of the present invention by embodiment below, but do not indicated that this
The protection domain of invention is limited in described in embodiment in scope.
Embodiment 1 is prepared containing Nb, 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 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, 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, 0.020% P, 0.027% S, tapping is into ladle when temperature is 1667 DEG C, and now actual tap is
132 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeNb alloys and anthracite carry out Si, Mn, Cr, Nb and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that Cr contents are that Nb contents are 65% in 54%, FeNb alloys in 82%, FeCr alloys in 74%, FeMn alloy, nothing
C is fixed in bituminous coal as 92%, controls in molten steel that Si contents are 0.30%, Mn contents are 0.60%, Cr contents are 0.10%, Nb contains
Measure as 0.010%, C content 0.15%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is 0.0060% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1569 DEG C, and molten steel is sent to conticaster and entered
Row casting.
150mm × 150mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1546 DEG C during continuous casting,
The liquidus temperature of steel is 1515 DEG C, bag sampling analysis ladle chemistry is 0.16% in conticaster C, 0.31%
Si, 0.62% Mn, 0.11% Cr, 0.010% Nb, 0.028% P, 0.018% S, 0.0063% 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 rib steel
Muscle.Slab heating temperature is 1215 DEG C, and soaking temperature is 1175 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled, eventually
It is 955 DEG C to roll temperature, 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 345MPa, tensile strength 453MPa, elongation are
35.5%th, maximum, force percentage of total elongation is 17.5%, 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 0.15%,
0.33% Si, 0.63% Mn, 0.03% Cr, 0.010% Nb, 0.020% P, 0.019% S, 0.0066%
N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 341MPa, tensile strength 445MPa, elongation 37.3%, maximum, force percentage of total elongation are 17.9%, 180
DEG C clod wash is qualified, and 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 96.7% 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 Nb, 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 Ribbed Bar for building, and production technology is to be blown into inert gas+feeding core-spun yarn → 6 after converter smelting → stove
The stream billet caster of machine 6 is cast into 200mm × 200mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoRibbed Bar.
120 tons of molten iron and 20 tons of steel scraps are added first in converter, the molten iron S contents of addition are 0.057%.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
0.09% C, 0.024% P, 0.029% S, tapping is into ladle when temperature is 1669 DEG C, and now actual tap is
135 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeNb alloys and anthracite carry out Si, Mn, Cr, Nb and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that Cr contents are that Nb contents are 65% in 54%, FeNb alloys in 82%, FeCr alloys in 74%, FeMn alloy, nothing
C is fixed in bituminous coal as 92%, controls in molten steel that Si contents are 0.93%, Mn contents are 1.30%, Cr contents are 0.60%, Nb contains
Measure as 0.050%, C content 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
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is 0.120% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1584 DEG C, and molten steel is sent to conticaster and entered
Row casting.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1527 DEG C during continuous casting,
The liquidus temperature of steel is 1495 DEG C, bag sampling analysis ladle chemistry is 0.29% in conticaster C, 0.96%
Si, 1.30% Mn, 0.59% Cr, 0.048% Nb, 0.028% P, 0.020% S, 0.0175% N, remaining is
Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to continous way production line of bar after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1036 DEG C, and soaking temperature is 1011 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 882 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 568MPa, tensile strength 725MPa, elongation are
22.5%th, maximum, force percentage of total elongation is 12.0%, 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 0.29%,
0.95% Si, 1.29% Mn, 0.03% Cr, 0.048% Nb, 0.025% P, 0.020% S, 0.0173%
N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 531MPa, tensile strength 693MPa, elongation 23.4%, maximum, force percentage of total elongation are 12.5%, 180
DEG C clod wash is 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 2, steel of the present invention relative to compared steel phase
It is 92.2% 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 Nb, 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 Ribbed Bar for building, and production technology is to be blown into inert gas+feeding core-spun yarn → 6 after converter smelting → stove
The stream billet caster of machine 6 is cast into 200mm × 200mm steel billets → heating steel billet → continous way rolling bar production line and is rolled intoRibbed Bar.
120 tons of molten iron and 20 tons of steel scraps, the molten iron S contents 0.53% of addition are added first in converter.Molten iron and steel scrap
After adding converter, C function is taken off using Converter Oxigen Blowing, molten iron and steel scrap are just smelt molten steel, arrived when molten steel composition just refines
0.07% C, 0.021% P, 0.025% S, tapping is into ladle when temperature is 1677 DEG C, and now actual tap is
131 tons (about 5% raw material is burnt in converter steelmaking process).In tapping process into molten steel add FeSi, FeMn, FeCr,
FeNb alloys and anthracite carry out Si, Mn, Cr, Nb and C element alloying, wherein Si contents are in the FeSi alloys added
Mn contents are that Cr contents are that V content is 65% in 54%, FeNb alloys in 82%, FeCr alloys in 74%, FeMn alloy, smokelessly
C is fixed in coal as 92%, controls in molten steel that Si contents are 0.65%, Mn contents are 0.95%, Cr contents are 0.40%, Nb contents
For 0.030%, C content 0.22%.
After molten steel arrival stove after chain-wales, steel ladle immediately accesses pipeline, and the molten steel into ladle is blown into nitrogen, is blown into nitrogen
Core-spun yarn containing N is added using the method for line feeding after gas 4min, N content is 0.0126% in control molten steel.
Continue to carry out thermometric after being blown into nitrogen 2min after having fed core-spun yarn, according to temperature-measuring results determine continue the nitrogen flushing time with
Liquid steel temperature is adjusted, thermometric is carried out again before outbound, it is outbound when liquid steel temperature is 1577 DEG C, and molten steel is sent to conticaster and entered
Row casting.
200mm × 200mm strands are cast on 6 machines 6 stream billet caster, tundish temperature is 1536 DEG C during continuous casting,
The liquidus temperature of steel is 1510 DEG C, bag sampling analysis ladle chemistry is 0.22% in conticaster C, 0.64%
Si, 0.96% Mn, 0.39% Cr, 0.031% Nb, 0.025% P, 0.020% S, 0.0122% N, remaining is
Fe and inevitable other impurity.Casting blank stacking naturally cools to room temperature.
Deliver to continous way production line of bar after slab cooling to be heated, rolled, rolling specs areIt is with ribbing
Reinforcing bar.Slab heating temperature is 1105 DEG C, and soaking temperature is 1080 DEG C, and total heat time, which reaches to come out of the stove after 95min, to be rolled,
Finishing temperature is 903 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 471MPa, tensile strength 605MPa, elongation are
26.5%th, maximum, force percentage of total elongation is 13.7%, 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 0.21%,
0.61% Si, 0.97% Mn, 0.03% Cr, 0.031% Nb, 0.025% P, 0.020% S, 0.0131%
N, remaining is Fe and inevitable other impurity, and specification isRibbed Bar.Examine compared steel mechanical property be：
ReL (Rp0.2) is 456MPa, tensile strength 591MPa, elongation 26.3%, maximum, force percentage of total elongation are 14.1%, 180
DEG C clod wash is 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 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 decay resistance.
The corrosion resisting property assay of table 3
Claims (9)
1. containing Nb, 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%, Nb:0.010%~0.050%, Cr:0.10%~0.60%, surplus is Fe and inevitable impurity.
2. the production method of the building Steel Bar containing Nb, Cr microalloy 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, continuous casting；Steel billet is heated, the rolling of continous way rolling bar production line is become a useful person,
Pole or Ribbed Bar is made in cooling；Core-spun yarn adjustment N, billet heating temperature control are fed in the ladle of chain-wales wherein after stove
950~1220 DEG C are made as, soaking temperature control is 1000~1200 DEG C, heating and 90~120min of soaking total time；The steel
Base composition is：By weight percentage, C：0.15%~0.30%, Si：0.30%~1.00%, Mn：0.60%~1.30%,
N:0.0060%~0.0180%, P≤0.040%, S≤0.040%, Nb:0.010%~0.050%, Cr:0.10%~
0.60%, surplus is Fe and inevitable impurity.
3. it is according to claim 2 containing Nb, Cr microalloy building Steel Bar production method, 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 that molten steel C content is
0.05%~0.15%, P content≤0.025%, S content≤0.035%, tap during liquid steel temperature >=1650 DEG C；
Tap 1/3-2/3 when, add FeSi, FeMn, FeCr, FeNb alloy and carburant, control C be 0.15%~0.30%,
Si be 0.30%~1.00%, Mn be 0.60%~1.30%, Cr be 0.10%~0.60%, Nb be 0.010%~
0.050%；
B, core-spun yarn is fed：It is transferred to ladle after tapping, ladle is reached after stove after chain-wales, and inert gas is blown into ladle, is added
Core-spun yarn containing N, 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 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 are 90~120min, and pole or Ribbed Bar are rolled into using continous way rolling bar production line.
4. the production method of the building Steel Bar according to claim 3 containing Nb, Cr microalloy, it is characterised in that：In step a
The molten iron requires S content≤0.060%.
5. the production method of the building Steel Bar according to claim 3 containing Nb, Cr microalloy, it is characterised in that：In step a
FeSi the and FeMn alloys FeSiMn alloy replacings.
6. the production method of the building Steel Bar according to claim 3 containing Nb, Cr microalloy, it is characterised in that：In step b
Described inert gas is one kind in argon gas or nitrogen.
7. the production method of the building Steel Bar according to claim 3 containing Nb, Cr microalloy, it is characterised in that：In step b
Time >=the 2min for being blown into inert gas.
8. the production method of the building Steel Bar according to claim 3 containing Nb, Cr microalloy, it is characterised in that：Step b goes out
Temperature of standing is higher than 60~90 DEG C of the liquidus temperature of steel.
9. the production method of the building Steel Bar according to claim 3 containing Nb, Cr microalloy, it is characterised in that：In step d
The specification of the pole or Ribbed Bar is
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711243905.1A CN107747047A (en) | 2017-11-30 | 2017-11-30 | Steel Bar and its production method are built containing Nb, Cr microalloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711243905.1A CN107747047A (en) | 2017-11-30 | 2017-11-30 | Steel Bar and its production method are built containing Nb, Cr microalloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107747047A true CN107747047A (en) | 2018-03-02 |
Family
ID=61249874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711243905.1A Pending CN107747047A (en) | 2017-11-30 | 2017-11-30 | Steel Bar and its production method are built containing Nb, Cr microalloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107747047A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815609A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing Nb, Cr microalloy |
| 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 |
| CN110819907A (en) * | 2019-10-24 | 2020-02-21 | 柳州钢铁股份有限公司 | Niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110846583A (en) * | 2019-12-24 | 2020-02-28 | 江苏永钢集团有限公司 | Nb microalloying high-strength steel bar and preparation method thereof |
| CN111549279A (en) * | 2020-01-11 | 2020-08-18 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich niobium microalloyed 400MPa ultrafine grain anti-seismic steel bar and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1730705A (en) * | 2005-08-08 | 2006-02-08 | 宣化钢铁集团有限责任公司 | Microalloyed reinforcing steel bar containing chromium and niobium, and its production process |
| CN102828119A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | High-bending 980MPa cold rolled dual-phase steel and its preparation technology |
| CN104263876A (en) * | 2014-09-22 | 2015-01-07 | 山东钢铁股份有限公司 | Nitrogen-increasing manganese-increasing method for high-strength steel production |
| JP2016084541A (en) * | 2015-12-22 | 2016-05-19 | 新日鐵住金株式会社 | Steel bar for case hardening and wire |
| CN107815609A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing Nb, Cr microalloy |
-
2017
- 2017-11-30 CN CN201711243905.1A patent/CN107747047A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1730705A (en) * | 2005-08-08 | 2006-02-08 | 宣化钢铁集团有限责任公司 | Microalloyed reinforcing steel bar containing chromium and niobium, and its production process |
| CN102828119A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | High-bending 980MPa cold rolled dual-phase steel and its preparation technology |
| CN104263876A (en) * | 2014-09-22 | 2015-01-07 | 山东钢铁股份有限公司 | Nitrogen-increasing manganese-increasing method for high-strength steel production |
| JP2016084541A (en) * | 2015-12-22 | 2016-05-19 | 新日鐵住金株式会社 | Steel bar for case hardening and wire |
| CN107815609A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing Nb, Cr microalloy |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107815609A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its LF stove production methods are built containing Nb, Cr microalloy |
| 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 |
| CN110819907A (en) * | 2019-10-24 | 2020-02-21 | 柳州钢铁股份有限公司 | Niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110819907B (en) * | 2019-10-24 | 2020-11-27 | 柳州钢铁股份有限公司 | Niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110846583A (en) * | 2019-12-24 | 2020-02-28 | 江苏永钢集团有限公司 | Nb microalloying high-strength steel bar and preparation method thereof |
| CN111549279A (en) * | 2020-01-11 | 2020-08-18 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich niobium microalloyed 400MPa ultrafine grain anti-seismic steel bar and preparation method thereof |
| CN111549279B (en) * | 2020-01-11 | 2021-05-18 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich niobium microalloyed 400MPa ultrafine grain anti-seismic steel bar and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102703811B (en) | Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof | |
| CN107747047A (en) | Steel Bar and its production method are built containing Nb, Cr microalloy | |
| CN102703812B (en) | Titanium microalloyed 500-MPa high-strength steel bar and production method thereof | |
| CN107955906A (en) | Steel bar and its production method are built containing V, Nb microalloy | |
| 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 | |
| CN107747053A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb microalloy | |
| 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 | |
| CN107815608A (en) | Microalloy containing Ti builds Steel Bar and its LF stove production methods | |
| CN107974619A (en) | Microalloy containing V builds steel bar and its production method | |
| 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 | |
| CN107815525A (en) | Microalloy containing Nb builds steel wire rod and its production method | |
| 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 | |
| CN107955904A (en) | Steel bar and its production method are built containing V, Nb, Ti microalloy | |
| CN107955918A (en) | Steel bar and its LF stove production methods are built containing V, Cr microalloy | |
| CN107723605A (en) | Steel Bar and its LF stove production methods are built containing Ti, Cr microalloy | |
| CN107747059A (en) | Steel wire rod and its production method are built containing V, Ti, Cr microalloy | |
| CN107815601A (en) | Steel wire rod and its LF stove production methods are built containing Nb, Cr microalloy | |
| CN107955913A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb, Cr microalloy | |
| CN107955899A (en) | Steel wire rod and its production method are built containing V, Nb microalloy | |
| CN107815604A (en) | Steel wire rod and its LF stove production methods are built containing V, Nb, Ti microalloy | |
| CN107747058A (en) | Steel Bar and its production method are built containing Ti, Cr 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: 20180302 |
|
| RJ01 | Rejection of invention patent application after publication |