CN110343949A - HRB400E high-strength anti-seismic steel bar production method and steel containing niobium vanadium - Google Patents
HRB400E high-strength anti-seismic steel bar production method and steel containing niobium vanadium Download PDFInfo
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Abstract
The HRB400E high-strength anti-seismic steel bar production method containing niobium vanadium that the invention discloses a kind of, the dosage of each raw material is calculated according to the content of each element in each element of reinforcing bar to be prepared proportion and raw material, and it prepares spare, converter is shaken to hot metal charging position, scrap iron material is added into it, add molten iron, it is blown twice, blowing to liquid steel temperature in furnace is 1670~1680 DEG C, and C element content is more than or equal to 0.06% in molten iron, P element content is less than or equal to 0.035% and S constituent content and is less than or equal to 0.040%, tap and calm 5~10min obtains steel ingot；Continuous casting and rolling are successively carried out, Nb-V-microalloyed HRB400E high-strength anti-seismic steel bar is obtained；The present invention reduces the V element usage amount in high-strength anti-seismic steel bar, thereby reduces production cost under the premise of guaranteeing reinforced steel bar strength.
Description
[technical field]
The invention belongs to smelting iron and steel and metal material processing and field shaping techniques, more particularly to one kind to contain niobium vanadium unit
The HRB400E high-strength anti-seismic steel bar production method and steel of element.
[background technique]
High-strength anti-seismic steel bar refers to the screw-thread steel of 335 or more intensity, at present steel industry HRB400E high-strength anti-seismic steel
Muscle mostly uses vanadium nitrogen or ferro-niobium individually to carry out microalloying with base.
For v n micro alloying, V element is added, since the solid solubility temperature of V element is generally below steel rolling temperature
Degree makes crystal grain grow up roughening after addition, V element is dissolved more, and precipitation is lacked, and invigoration effect is also unobvious.In addition, in recent years
Come further increasing with environmental protection pressure, VN alloy price as a raw material for production soars all the way, from 130,000 in 2016
Yuan/ton, to 480,000 yuan/ton in 2018, so that the steel cost of alloy of V microalloying HRB400E technique production is higher, it is unfavorable
Cost efficiency is realized in enterprise.
For ferro-niobium microalloying, Nb element is added, and can reduce transformation temperature, is increased nuclear driving force, is made ferrite
It is carried out at a lower temperature with bainitic transformation, so that super fine organization is formed, and Nb meltage in austenite is limited, so that
Invigoration effect is restricted.It, need to be compared in order to guarantee that the carbonitride of Nb is fully dissolved in austenite in addition, in process of production
High billet heating temperature causes the oxidization burning loss of steel billet higher, and Cracks In Continuous Cast Billets occurs, and occasionally there are yields point of steel bar not
Phenomena such as obvious.
[summary of the invention]
The object of the present invention is to provide a kind of HRB400E high-strength anti-seismic steel bar production method and steel containing niobium vanadium
Material reduces the V element usage amount in high-strength anti-seismic steel bar, thereby reduces and be produced under the premise of guaranteeing reinforced steel bar strength
This.
The invention adopts the following technical scheme: a kind of HRB400E high-strength anti-seismic steel bar producer containing niobium vanadium
Method, comprising the following steps:
The dosage of each raw material is calculated according to the content of each element in each element of reinforcing bar to be prepared proportion and raw material, and
Prepare it is spare, wherein the weight percentage of each element of reinforcing bar to be prepared be C:0.22~0.25%, Si:0.45~0.70%, Mn:
1.30~1.45%, 0 < V≤0.015%, 0 < Nb≤0.025%, S≤0.045%, P≤0.045%, remaining is Fe, and each
The sum of weight percent of element is 100%；
Converter is shaken to hot metal charging position, scrap iron material is added into it, adds molten iron, shakes positive converter to blow position；
Adjusting oxygen rifle to distance between its oxygen exhaust and molten iron level is 0.8~1.0m, to converter inside be blown into oxygen, while to converter
Interior addition part slag former carries out first stage blowing, and the time is 7~8min；
Remaining slag former is added into converter, while adjusting oxygen rifle to distance between its oxygen exhaust and molten iron level is 1.4
~1.6m carries out second stage blowing, and blowing to liquid steel temperature in furnace is 1670~1680 DEG C, and C element content is greater than in molten iron
It is less than or equal to 0.035% and S constituent content equal to 0.06%, P element content and is less than or equal to 0.040%；
It taps: bottom Argon being carried out to ladle and is sequentially added thereto when molten iron reaches 1/4 capacity in ladle
Antaciron, silicomangan, VN alloy and ferrocolumbium, until adding whole conjunctions when molten iron reaches 3/4 capacity in ladle
Gold, calm 5~10min obtain steel ingot；
Steel ingot is successively subjected to continuous casting and rolling, obtains Nb-V-microalloyed HRB400E high-strength anti-seismic steel bar.
Further, the amount that slag former is added for the first time is the 2/3 of slag former gross mass, the amount of second of addition slag former
It is the 1/3 of slag former gross mass.
Further, in tapping, first part's carburant first is added to ladle bottom, and before tapping is completed, is added
The weight ratio of second part carburant, first part's carburant and second part carburant is 2:(3~3.5).
Further, soaking zone heating temperature is 1130~1170 DEG C in the operation of rolling, and heating time is 40~60min.
Further, ferrocolumbium uses trade mark FeNb60-B alloy.
Another technical solution of the invention: a kind of high-strength anti-seismic steel containing niobium and vanadium, each member in anti-seismic steel
The weight percent of element are as follows:
C:0.22~0.25%, Si:0.45~0.70%, Mn:1.30~1.45%, 0 < V≤0.015%, 0 < Nb≤
0.025%, S≤0.045%, P≤0.045%, remaining is Fe, and the sum of weight percent of each element is 100%.
The beneficial effects of the present invention are: the present invention is high by the original part of the niobium element substitution that part low price is added in steel
The vanadium of valence, compared with V microalloying HRB400E or Nb microalloying HRB400E production ton steel alloy cost reduce about 30 yuan with
On；Moreover, in conjunction with V microalloying HRB400E high-strength quake-proof reinforcing steel bar production technology and Nb microalloying HRB400E high-strength anti-shock steel
The advantage and disadvantage of muscle production technology can form carbonitride after niobium and vanadium are added in steel, NbC, NbN, V (C, N),
Precipitation enhancement is played, since the complete solid solubility temperature of Nb is higher, needs higher soaking temperature, and the solid solubility temperature of V is low,
Therefore, Nb, V are added in steel simultaneously, can not only play the role of precipitation strength, can also play refinement crystal grain, from
And the intensity of steel can be improved and improve the toughness of steel, guarantee steel performance and quality, so that product meets new national standard GB/
T1499.2-2018 requirement.
[specific embodiment]
The present invention is described in detail With reference to embodiment.
The present invention, in base production process, passes through addition niobium element substitution part in existing HRB400E high-strength quake-proof reinforcing steel bar
Vanadium carries out microalloying jointly, and this method is made HRB400E high-strength anti-seismic steel bar and is greatly reduced with base cost, and Nb, V are same
It in Shi Tianjia steel, can not only play the role of precipitation strength, refinement crystal grain can also be played, so that steel can be improved
Intensity, and the toughness of steel can be improved.
The HRB400E high-strength anti-seismic steel bar production method containing niobium vanadium that the invention discloses a kind of, including it is following
Step:
The dosage of each raw material is calculated according to the content of each element in each element of reinforcing bar to be prepared proportion and each raw material,
And prepare it is spare, wherein the weight percentage of each element of reinforcing bar to be prepared be C:0.22~0.25%, Si:0.55~0.70%,
Mn:1.30~1.45%, 0 < V≤0.015%, 0 < Nb≤0.025%, S≤0.045%, P≤0.045%, remaining is Fe,
And the sum of weight percent of each element is 100%.
After the completion of ingredient, converter is shaken to hot metal charging position and adds molten iron after scrap iron material first is added into it, is added
After molten iron, positive converter is shaken to blow position.The secondary use of scrap iron may be implemented by the way that scrap iron material is added, reduce costs, and
And molten iron first is added after addition scrap iron material, it can be poured by the molten iron being added below on the scrap iron material that front is added, utilize iron
The temperature of water melts scrap iron material, and energy consumption is effectively reduced, and scrap iron material is added compared to being first added after molten iron, scrap iron material melts more
Add sufficiently, also avoids generating the case where molten iron splashes when scrap iron material being added into molten iron, improve the safety coefficient of operative employee.
After molten iron is added into converter, the position of oxygen rifle in converter is reduced, and to oxygen is blown into inside converter, i.e. constant pressure becomes
Rifle operation, at this point, the distance between oxygen rifle and molten iron surface be in 0.8~1.0m, meanwhile, in order to remove in molten iron and scrap iron material
C, O, P, S and gas, that is, go to be mingled with, into furnace be added first part's slag former, carry out first stage blowing.In the present invention
Slag former selects the mixture of lime, high magnesium ash and sinter.
In first segment converting process, have under enough Oxygen Conditions, the molten iron in converter can be persistently overheating until handle
Scrap iron material melts completely, and reducing oxygen rifle is to guarantee initial stage slag morningization to provide sufficient oxygen to molten iron, and process scorification is saturating,
Under normal circumstances, the stage oxygen rifle and the temperature of molten iron are maintained at 1m or so, and the time in the stage is generally 7~8min.
After first stage blowing reaction, the scrap iron material in converter is substantially completely melted into molten iron, melts with the molten iron of addition
It is integrated, at this point, remaining slag former is added into furnace, rises at the same time oxygen rifle and carry out second stage blowing, due to useless in converter
Iron charge melts substantially, at this point, the demand to oxygen is not too big, so, oxygen rifle is promoted, general promotion to 1.4~
1.6m or so, the molten iron temperature being mainly to maintain in converter prevent slag from returning dry, and the time in the stage is generally 4~5min.In order to
The quantity of slag is reduced, slag is allowed to melt as early as possible, first part's slag former is the 2/3 of slag former total weight, and second part slag former is slag making
The 1/3 of agent total weight.
In the prior art, for blowing, due to lower to molten iron intensity requirement is produced, oxygen can't frequently be changed
The distance between rifle and liquid level, general oxygen rifle and liquid level distance are in 1.2m or so, however, by the uniform of molten iron in the application
Property controlled, and then promote the performance of product, converting process be divided into two stages, the first stage reduces the distance of oxygen rifle,
Make it between 0.8~1.0m, promotion oxygen-supplying amount, oxygen loss amount are also reduced in this way, and can by the oxygen rifle with air pressure
To give molten iron certain pressure, molten iron is promoted gently to flow, it can quick slag charge of the melting in it.Second low order increases oxygen
Rifle distance makes it in 1.4~1.6m or so, in this way the distance due to oxygen rifle and liquid level, and under same air pressure, molten iron will not flow
It is dynamic, keep it in stable state.
In this process, some column reactions be will do it in furnace, key reaction is as follows:
(1) oxidation of Fe:
O2+ 2 ﹝ Fe ﹞=2FeO ﹝ O ﹞+﹝ Fe ﹞=FeO
(2) oxidation and reduction of Si:
2 ﹝ O ﹞+﹝ Si ﹞=SiO2
+ 2 (FeO)=(SiO of ﹝ Si ﹞2)+2 ﹝ Fe ﹞
(SiO2)+2 (FeO)=(2FeOSiO2)
(2FeO·SiO2)+2 (CaO)=(2CaOSiO2)+2(FeO)
(3) oxidation and reduction of Mn:
O2+ 2 ﹝ Mn ﹞=2MnO ﹝ Mn ﹞+﹝ O ﹞=(MnO)
﹝ Mn ﹞+(FeO)=(MnO)+﹝ Fe ﹞
(4) oxidation and reduction of C:
2(C)+O2=2CO
(FeO)+O2=(Fe2O3) (Fe2O3) ﹞=3+﹝ Fe (FeO)
(FeO)=﹝ O ﹞+﹝ Fe ﹞ ﹝ C ﹞+﹝ O ﹞=CO
(5) P reaction is taken off:
+ 5 (FeO)=(P of 2 ﹝ P ﹞2O5)+5 ﹝ Fe ﹞
3(FeO)+(P2O5)=(3FeOP2O5)
(3FeO·P2O5)+4 (CaO)=(4CaOP2O5)+3(FeO)
+ 4 (CaO)=(4CaOP of 2 ﹝ P ﹞+5 (FeO)2O5)+5 ﹝ Fe ﹞
(6) S reaction is taken off:
﹝ FeS ﹞=(FeS) (FeS)+(CaO)=(Cas)+(FeO)
﹝ FeS ﹞+(CaO)=(Cas)+(FeO).
When at this stage, the molten iron temperature in converter is generally 1670~1680 DEG C, and total duration of blast is about 10~
Converter is shaken to sample position, carries out thermometric sampling, be then sent to stokehold laboratory and chemically examined by 15min, grate work, alloy work
Each component element content C, Si, Mn, V, Nb, the S needed and P element are calculated according to the amount of sampling, and weighs the alloy of corresponding amount,
Subsequent detection is carried out, when C element content is more than or equal to 0.06%, P element content less than or equal to 0.035% and S in testing result
When constituent content is less than or equal to 0.040% (S element is impure in alloy), tapping steel is carried out.Otherwise, by oxygen rifle to iron
Water carries out partial points and blows, until meeting the requirements.
When carrying out tapping steel, buggy ladle is opened to furnace, to ladle carry out bottom Argon, pressure be 0.4~
0.6MPa, since the process time is short, and the additional amount of carburant is larger, can not disposably complete that increasing is added in this process
Carbon agent, so, first part's carburant first is added to ladle bottom, taps after converter is shaken to furnace, when molten iron in ladle
It when reaching 1/4 capacity, is covered substantially by molten iron in ladle, and the temperature in ladle and other conditions all tend towards stability at this time, to
Antaciron, silicomangan, VN alloy and ferrocolumbium are wherein sequentially added, at this point, alloy can be quick with molten steel after being added
Reaction, since alloy amount is big, under normal circumstances, until all being added when stating that molten iron reaches 3/4 capacity in ladle.Also, going out
Before steel is completed, be added second part carburant, the weight ratio of first part's carburant and second part carburant be 2:(3~
3.5).The sequence that alloy is added is added according to its deoxidation intensity, to guarantee sufficiently reaction.
Ferrocolumbium is added using trade mark FeNb60-B alloy, and FeNb60-B alloy is according to weight percent, by with the following group
Be grouped as: Nb:60~70%, C≤0.3%, Si≤3.0%, remaining is Fe, control impurity content: P≤0.3%, S≤
0.10%, the sum of weight percent of each component is 100%.
V element is added by VN alloy, composed of the following components according to weight percent: V: >=77.5%, N: >=
12%, C :≤6.0%, Si≤1.5%, remaining is Fe, controls impurity content: P≤0.01%, S≤0.01%, the weight of each component
Measuring the sum of percentage is 100%.
C element is added by carburant, composed of the following components according to weight percent: C:88~90%, remaining is
Impurity, the sum of weight percent of each component are 100%.
Si element is added by Antaciron, composed of the following components according to weight percent: Si:71~80%, Al
≤ 1.5%, Ca≤1.0%, Mn≤0.5%, Cr≤0.5%, remaining is Fe, control impurity content: P≤0.05%, S≤
0.03%, the sum of weight percent of each component is 100%.
Mn element is added by silicomangan, and according to weight percent, silicomangan is composed of the following components: Mn:63
~72%, Si:16~20%, C≤2.5%, remaining is Fe, control impurity content: P≤0., 25%, S≤0.04%, each component
The sum of weight percent be 100%.
After the completion of tapping, buggy ladle is outputed and allows molten steel calmness 5~10 minutes (pressure: 0.4~0.6MPa), so far smelts
It completes.
When carrying out continuous casting, ladle is hung to bale panoramic tables device, and take long nozzle, pours and build up continuous casting billet, it later, will
Continuous casting billet is transported to bar line-rolling, and is sent into heating furnace and is heated, and soaking zone heating temperature is 1130~1170 DEG C, when heating
Between be 40~60min, steel billet after heating carry out roughing, in roll and finish rolling, upper cold bed cooled to room temperature obtain niobium vanadium
Microalloying HRB400E high-strength anti-seismic steel bar.
It is a feature of the present invention that substituting part VN alloy with the ferro-niobium with price and superiority of effectiveness, carry out
HRB400E high-strength anti-seismic steel bar is produced with base, in the case where guaranteeing that steel product quality meets new national standard requirement and stable condition, reduces vanadium
The additional amount of nitrogen alloy reduces cost of alloy, to further decrease production cost.
The features of the present invention also characterized in that because steel billet ingredient adds two kinds of elements of V, Nb, in slab crystallization process collective effect,
Precipitation strength can not only be played the role of, can also play refinement crystal grain, thus can improve steel intensity and
The toughness of steel is improved, and reduces billet heating temperature (soaking temperature averagely reduces by 30 DEG C, ton steel gas consumption reduction 4m3),
The oxidization burning loss of steel billet is reduced, and continuous casting billet quality (crackle) is obviously improved, and yield point of steel bar is obvious.
The invention also discloses a kind of high-strength anti-seismic steel containing niobium and vanadium, the weight hundred of each element in anti-seismic steel
Divide ratio are as follows: C:0.22~0.25%, Si:0.45~0.70%, Mn:1.30~1.45%, 0 < V≤0.015%, 0 < Nb≤
0.025%, S≤0.045%, P≤0.045%, remaining is Fe, and the sum of weight percent of each element is 100%.
Embodiment 1:
The present embodiment is preparation Φ 25mmHRB400E high-strength anti-seismic steel bar.
Step 1,120 tons of converters are shaken to hot metal charging position, prepare 30 tons of steel scraps are hung to by overhead traveling crane by steel scrap bucket to be turned
Stokehold is added.Ladle is hung to stokehold, 125 tons of molten iron are blended into furnace；Converter is shaken just to blowing (oxygen blast gas) position.
Step 2, start to reduce oxygen rifle, constant pressure becomes rifle (pressure) operation, slag making is added into furnace while reducing oxygen rifle
Agent (lime 40kg/t, high magnesium ash 20kg/t, sinter 5kg/t) continues oxygen blast, blows 4~7 minutes, and second batch slag former is added,
Continue oxygen blast 3~4 minutes, 12 oxygen blast minute in total, early period rifle position lower (horizontal position is constant, highly adjusts to away from molten steel liquid
At the 1m of face), guarantee initial stage slag morningization, process scorification is saturating, and the later period improves rifle position, and (horizontal position is constant, highly adjusts to away from molten steel
At liquid level 1.4m), prevent slag from returning dry.
Step 3, after blowing 12 minutes, oxygen rifle is lifted, grate work shakes stove to sampling position, and thermometric samples and send stokehold
Laboratory is chemically examined, and stove is shaken just.
Step 4, alloy work is according to component requirements: HRB400E high-strength anti-seismic steel bar weighs down according to weight percent
Column component: C:0.23%, Si:0.60%, Mn:1.35%, V:0.012%, Nb:0.020%, S:0.035%, P:0.040%,
Calculate various alloy addition requirements: carburant: 206kg, VN alloy 25kg, ferro-niobium 50kg, Antaciron 653kg, silicon
Manganese 2856kg, and weigh in place.
Wherein ferrocolumbium: Nb:65%, VN alloy V:78%, carburant C:90%, Antaciron Si:75%, silicomanganese
Alloy Mn:65%, Si:18%.
Step 5, contents temperature testing result: C:0.11%, P:0.032%, S:0.029%, T:1680 DEG C are conformed to
It asks, taps after stove is shaken to furnace, the buggy ladle for being located ladle is opened to furnace, carburant 80kg is first added in bottom of steel ladle,
Remaining is added before tapping is completed, and alloy is added when tapping 1/4 (i.e. the 1/4 of ladleful) with steel stream, alloy addition sequence
For Antaciron, silicomangan, VN alloy, ferrocolumbium, molten steel all adds when going out to 3/4, before molten iron and opens steel
Packet bottom blowing Argon (pressure: 0.45MPa).
Step 6, after the completion of tapping, buggy ladle is outputed and allows calm 6 minutes (pressure: 0.5MPa) of molten steel；It has smelted above
At.
Step 7, ladle is hung to bale panoramic tables (device), and takes long nozzle, pour into continuous casting billet.
Step 8, continuous casting billet is transported to bar line-rolling, is sent into heating furnace and is heated, and soaking zone heating temperature is 1150 DEG C,
Heating time is 50min.
Step 9, steel billet after heating carry out roughing, in roll and finish rolling, upper cold bed cooled to room temperature are micro- up to niobium vanadium
Alloying HRB400E high-strength quake-proof reinforcing steel bar.
After tested, the steel billet chemical component that prepared by embodiment 1 is shown in Table 1, and reinforcement parameter is shown in Table 2, and steel mechanics performance closes
Lattice.
Embodiment 2
Φ 12mmHRB400E high-strength anti-seismic steel bar is prepared, is specifically implemented according to the following steps:
Step 1,120 tons of converters are shaken to hot metal charging position, the steel scrap bucket for preparing steel scrap (30 tons) is hung to converter by overhead traveling crane
Preceding addition；Ladle is hung to stokehold, 125 tons of molten iron are blended into furnace；Converter is shaken just to blowing (oxygen blast gas) position；
Step 2, start to reduce oxygen rifle, constant pressure becomes rifle (pressure) operation, while slag former (lime 38kg/t, Gao Mei is added
Grey 17kg/t, sinter 5kg/t), slag charge is added in two batches, first is added while reducing oxygen rifle, and second batch is increasing
It is added while oxygen rifle.
Early period, rifle position was lower (horizontal position is constant, highly adjusts at away from liquid steel level 1m), guaranteed initial stage slag morningization, mistake
Journey scorification is saturating, and the later period improves rifle position (horizontal position is constant, highly adjusts at away from liquid steel level 1.5m), prevents slag from returning dry.
Step 3, after blowing 12.5 minutes (first stage oxygen blast 8 minutes, second stage oxygen blast 4.5 minutes), oxygen rifle is mentioned
It rises, grate work shakes stove to sampling position, and thermometric samples and stokehold laboratory is sent to be chemically examined, stove is shaken just.
Step 4, alloy work is according to component requirements: HRB400E high-strength anti-seismic steel bar weighs down according to weight percent
Column component: C:0.23%, Si:0.50%, Mn:1.35%, V:0.012%, Nb:0.020%, S:0.035%, P:0.040%,
Various alloy addition requirements: carburant: 206kg, VN alloy 25kg, ferro-niobium 50kg, Antaciron 441kg, silicomanganese
2856kg, and weigh in place.
Wherein ferrocolumbium: Nb:65%, VN alloy V:78%, carburant C:90%, Antaciron Si:75%, silicomanganese
Alloy Mn:65%, Si:18%.
Step 5, contents temperature testing result: C:0.10%, P:0.028%, S:0.026%, T:1670 DEG C), it conforms to
It asks, taps after stove is shaken to furnace, the buggy ladle for being located ladle is opened to furnace, carburant 80kg is first added in bottom of steel ladle,
Tapping process addition is remained in, alloy is added in tapping 1/4 with steel stream, and alloy addition sequence is ferrosilicon, silicomanganese, vanadium nitrogen, niobium
Iron, molten steel all add when going out to 3/4, are added and open ladle bottom blowing Argon (pressure: 0.45MPa)；
Step 6, after the completion of tapping, buggy ladle is outputed and allows calm 5.5 minutes (pressure: 0.5MPa) of molten steel；It is above to smelt
It completes.
Step 7, ladle is hung to bale panoramic tables (device), and takes long nozzle, pour into continuous casting billet.
Step 8, continuous casting billet is transported to bar line-rolling, is sent into heating furnace and is heated, and soaking zone heating temperature is 1145 DEG C,
Heating time is 45min；
Step 9, steel billet after heating carry out roughing, in roll and finish rolling, upper cold bed cooled to room temperature are micro- up to niobium vanadium
Alloying HRB400E high-strength quake-proof reinforcing steel bar.
After tested, the steel billet chemical component that prepared by embodiment 2 is shown in Table 1, and reinforcement parameter is shown in Table 2, and steel mechanics performance closes
Lattice.
Table 3 is Cost comparisons' table of the reinforcing bar that embodiment 1 obtains and v n micro alloying reinforcing bar, is learnt according to the table, real
The cost of alloy applied in example 1 has dropped 23.0936 yuan compared to the cost of existing v n micro alloying reinforcing bar.Table 4 is to implement
Cost comparisons' table of reinforcing bar and v n micro alloying reinforcing bar that example 2 obtains, learns, the cost of alloy in embodiment 2 according to the table
Cost compared to existing v n micro alloying reinforcing bar has dropped 31.4126 yuan.
Table 1
| Specification | C | Si | Mn | S | P | V | Nb |
| Φ25mm | 0.23 | 0.60 | 1.35 | 0.027 | 0.026 | 0.012 | 0.020 |
| Φ12mm | 0.23 | 0.50 | 1.35 | 0.025 | 0.029 | 0.012 | 0.020 |
Table 2
Table 3
Table 4
Claims (6)
1. a kind of HRB400E high-strength anti-seismic steel bar production method containing niobium vanadium, which is characterized in that including following step
It is rapid:
The dosage of each raw material is calculated according to the content of each element in each element of reinforcing bar to be prepared proportion and raw material, and is prepared
It is spare, wherein the weight percentage of each element of reinforcing bar to be prepared is C:0.22~0.25%, Si:0.45~0.70%, Mn:1.30
The < of~1.45%, 0 < V≤0.015%, 0 Nb≤0.025%, S≤0.045%, P≤0.045%, remaining is Fe, and each element
The sum of weight percent be 100%；
Converter is shaken to hot metal charging position, scrap iron material is added into it, adds molten iron, shakes positive converter to blow position；Adjustment
Oxygen rifle to distance between its oxygen exhaust and molten iron level be 0.8~1.0m, to converter inside be blown into oxygen, while into converter plus
Enter part slag former, carry out first stage blowing, the time is 7~8min；
Remaining slag former is added into converter, at the same adjust oxygen rifle to distance between its oxygen exhaust and molten iron level be 1.4~
1.6m carry out second stage blowing, blowing to liquid steel temperature in furnace be 1670~1680 DEG C, and in molten iron C element content be greater than etc.
It is less than or equal to 0.035% and S constituent content in 0.06%, P element content and is less than or equal to 0.040%；
It taps: bottom Argon being carried out to ladle and is sequentially added thereto when molten iron reaches 1/4 capacity in the ladle
Antaciron, silicomangan, VN alloy and ferrocolumbium, until adding whole conjunctions when molten iron reaches 3/4 capacity in ladle
Gold, calm 5~10min obtain steel ingot；
The steel ingot is successively subjected to continuous casting and rolling, obtains Nb-V-microalloyed HRB400E high-strength anti-seismic steel bar.
2. a kind of HRB400E high-strength anti-seismic steel bar production method containing niobium vanadium as described in claim 1, feature
It is, the amount that slag former is added for the first time is the 2/3 of slag former gross mass, and second of amount that slag former is added is the total matter of slag former
The 1/3 of amount.
3. a kind of HRB400E high-strength anti-seismic steel bar production method containing niobium vanadium as claimed in claim 2, feature
It is, in tapping, first part's carburant first is added to the ladle bottom, and before tapping is completed, second part is added
The weight ratio of carburant, first part's carburant and second part carburant is 2:(3~3.5).
4. a kind of HRB400E high-strength anti-seismic steel bar production method containing niobium vanadium as claimed in claim 3, feature
It is, soaking zone heating temperature is 1130~1170 DEG C in the operation of rolling, and heating time is 40~60min.
5. a kind of HRB400E high-strength anti-seismic steel bar production method containing niobium vanadium as described in claim 3 or 4,
It is characterized in that, the ferrocolumbium uses trade mark FeNb60-B alloy.
6. a kind of high-strength anti-seismic steel containing niobium and vanadium, which is characterized in that the weight hundred of each element in the anti-seismic steel
Divide ratio are as follows:
C:0.22~0.25%, Si:0.45~0.70%, Mn:1.30~1.45%, 0 < V≤0.015%, 0 < Nb≤
0.025%, S≤0.045%, P≤0.045%, remaining is Fe, and the sum of weight percent of each element is 100%.
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| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111519100A (en) * | 2020-01-11 | 2020-08-11 | 武钢集团昆明钢铁股份有限公司 | Niobium-vanadium microalloyed 400 MPa-grade ultrafine-grain high-toughness anti-seismic reinforcing steel bar and preparation method thereof |
| CN112063911A (en) * | 2020-08-14 | 2020-12-11 | 陕西龙门钢铁有限责任公司 | Preparation method for producing HRB400E high-strength anti-seismic bar |
| CN115652200A (en) * | 2022-10-18 | 2023-01-31 | 南京钢铁股份有限公司 | Niobium-vanadium composite microalloyed HRB400 deformed steel bar and preparation method thereof |
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