CN102618691B - Method for producing HRB 600 high-strength steel through micro-alloying - Google Patents
Method for producing HRB 600 high-strength steel through micro-alloying Download PDFInfo
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Abstract
The invention discloses a method for producing HRB 600 high-strength steel through micro-alloying. The method comprises the following steps: firstly, blast-furnace hot metal desulfurized is subjected to deslagging, temperature-measuring and sampling, so that the slag rate is not more than 0.5%, and then the blast-furnace hot metal is to be blown; before blowing, scrap steel is added in advance, after blowing, slag forming constituents such as lime are added in advance, the oxygen working pressure is 0.80 to 0.90 MPa, a rocking furnace is used for measuring the temperature and sampling after the blowing is finished, the temperature measurement and the sampling are finished within 2 minutes, if qualified, the blast-furnace hot metal is directly poured into the furnace for steel tapping, while if not qualified, the blast-furnace hot metal needs steel tapping after reblowing, at the same time, silicomanganese and ferrosilicon are added to be subjected to the micro-alloying operation, and then ferroniobium, ferrochrome, ferrovanadium and ferrotitanium are added to be subjected to the micro-alloying operation, and finally the blast-furnace hot metal is subjected to argon blowing modulation to enable the temperature and the compositions to be uniform. Compared with the prior art, the method for producing HRB 600 high-strength steel through micro-alloying operations can produce qualified HRB 600 high-strength steel, and fills a gap that HRB 600 high-strength steel cannot be produced in China.
Description
Technical field
The present invention relates to Iron and Steel Production field, exactly refer to a kind of method of microalloying production HRB600 high-strength steel.
Background technology
At present, China is strengthening the High Strength Steel Bar dynamics of applying, and widely applies the ripe of High Strength Steel Bar.Apply high strength cast iron, the challenge of can boosting Iron And Steel Industry implementation structure adjusting, can promote again all kinds of buildings of China and Infrastructure to improve quality and life-span, has very high realistic feasibility, significant economic benefit and social benefit.Apply high strength cast iron, improve class, quality and the stability of reinforcing bar, will promote iron and steel " minimizing " application, support upgrading transition of construction industry; Meanwhile, alleviate resource, the energy and the restriction of environment to Iron and Steel Production, the quickening of China's Iron And Steel Industry is realized by focusing on the transformation of scale enlargement item emphasis quality benefit and being of great significance.During " 12 ", High Strength Steel Bar ratio will bring up to 80% by 40%, will reduce every year 1000 ten thousand tons of left and right of reinforcing bar usage quantity, reduce 1,600 ten thousand tons of left and right of iron ore consumption, reduce 2,000 ten thousand tons of left and right of Carbon emission.
At present, the High Strength Steel Bar of 600MPa rank that only had a few major industrialized country's Development and Production such as the U.S. in the world.For many years, although China is for applying High Strength Steel Bar, take specification revision, carried out the multinomial measures such as demonstration project, but compared with developed countries, China's building trade reinforced steel bar strength used is a low 1-2 grade generally, the industrial scale of High Strength Steel Bar is also very little, does not especially substantially also start to walk in China for the production of 600MPa level High Strength Steel Bar.
Summary of the invention
For above-mentioned defect, the technical problem that the present invention solves is to provide a kind of microalloying to produce the method for HRB600 high-strength steel, can produce qualified HRB600 high-strength steel, has filled up the blank that China produces HRB600 high-strength steel.
In order to solve above technical problem, microalloying provided by the invention is produced the method for HRB600 high-strength steel, comprises the following steps:
(1), pack molten iron into converter, wherein the carbon content of molten iron is not less than 3.6%, and molten iron temperature is between 1280 DEG C-1330 DEG C, and silicone content is no more than 0.60%, P content and is no more than 0.100%, S content and is no more than 0.080%;
(2), molten iron pretreatment desulfurizing, below desulfurizing iron to 0.050%, and must take off the dregs in naked molten iron after desulfurization, make the band quantity of slag of molten iron be less than or equal to 0.5%, the molten iron temperature after desulfurization is not less than 1250 DEG C;
(3), molten iron thermometric and sampling, make into need the satisfy condition requirement of (1), (2) of composition, the temperature of stove molten iron;
(4), the add-on control of lime slag former and steel scrap:
Lime adding amount=2.2 × molten iron containing [Si] %+[P] %} × basicity × (iron water amount+pig)/lime effective CaO % content;
Adding amount of scrap steel=molten iron Intake Quantity × (15-20) %, if enter capping of stove molten iron temperature height, temperature is low to be removed the limit;
(5), converter smelting control Parameter Conditions is as follows:
Oxygen supply control: oxygen operating pressure 0.80MP-0.90MPa, oxygen-supplying amount is 16500-18500Nm
3/ h, oxygen supply intensity 3.2-4.0Nm
3/ t.min, the intensity of bottom blowing nitrogen is 0.23-0.30m
3/ min.t;
Smelting temperature control: Primary period by temperature held stationary increase, reaction between carbon and oxygen arrive before control temperature below 1450 DEG C, to the later stage control terminal temperature 1620-1700 DEG C of left and right;
(6), grate tapping steel
In the time that reaching the terminal control target in following table, smelting molten steel can tap:
1. end point carbon is controlled at 0.10-0.15%, and P, S all need to be controlled within 0.025%, and basicity R is controlled at 2.8-3.5;
2. tapping temperature is controlled at 1675 ± 5 DEG C, tapping time >=2.5min;
Need to continue blowing until various composition meets terminal control target if do not reach above-mentioned control target;
(7), alloying and microalloying control
The control of alloy addition sequence: alloy addition sequence is first to add silicomanganese and ferrosilicon to carry out alloying, and then add ferro-niobium, ferrochrome, vanadium iron and ferrotianium and carry out microalloying, wherein, alloy addition is: silicomanganese 25.5-27.0kg/t, ferrosilicon 8.0-9.5kg/t, ferro-niobium 2.0-3.5kg/t, ferrochrome 4.5-6.5kg/t, vanadium iron 3.0-5.0kg/t, ferrotianium 1.5-3.0kg/t;
(8), Argon modulation;
(9), obtain qualified molten steel.
Preferably, in step (7), alloy addition sequence is to start to add silicomanganese and ferrosilicon to carry out alloying to 1/3 o'clock in tapping, and then add ferro-niobium, ferrochrome, vanadium iron and ferrotianium and carry out microalloying, all alloys all added before tapping 3/4, ferro-niobium, ferrochrome, vanadium iron and these four kinds of micro alloying elements of ferrotianium must not load in mixture simultaneously, need classification, add in batches.
Preferably, in step (8), it is 150-200mm apart from height at the bottom of tank that argon rifle inserts rifle head by large tank central position, and argon pressure is controlled at 0.40-0.80MPa.
Microalloying provided by the invention is produced the method for HRB600 high-strength steel, first by blast-melted take off most slag, thermometric, sampling after treatment desulfurization, makes its band slag rate be no more than 0.5%, then waits to blow; Before starting, blowing first adds steel scrap, after beginning, first add the slag formers such as lime, oxygen operating pressure 0.80-0.90MPa, until after blow end point, the sampling of grate thermometric, thermometric sampling need complete within 2min, if the qualified directly tapping of falling stove of composition, if off analysis is tapped after need re-blowing again, in tapping time,, first add silicomanganese, ferrosilicon carries out alloying operation, then add ferro-niobium, ferrochrome, vanadium iron and ferrotianium and carry out microalloying operation, be finally that molten steel is carried out to Argon modulation, make its temperature composition even.Compared with prior art, microalloying provided by the invention is produced the method for HRB600 high-strength steel, can produce qualified HRB600 high-strength steel, has filled up the blank that China produces HRB600 high-strength steel.
Brief description of the drawings
Fig. 1 is the process flow sheet that microalloying provided by the invention is produced the method for HRB600 high-strength steel.
Embodiment
For those skilled in the art can understand technical scheme provided by the present invention better, set forth below in conjunction with specific embodiment.
Refer to Fig. 1, this figure is the process flow sheet that microalloying provided by the invention is produced the method for HRB600 high-strength steel.
Vanadium extraction by converter blowing principle of the present invention is as follows: vanadium extraction by converter blowing is exactly the principle of utilizing selective oxidation, adopt high speed oxygen jet in converter, vanadium-bearing hot metal to be stirred, vanadium in molten iron is oxidized to stable barium oxide, to produce a kind of physical-chemical reaction process of vanadium slag.In reaction process, by adding refrigerant control bath temperature below carbon vanadium invert point, reach the object of " going vanadium to protect carbon ", to obtain high-grade vanadium slag and high physical thermal, produce commodity vanadium slag for next step and supply raw materials.
Same stove single-link procedure vanadium extraction principle of the present invention is as follows: do not add lime slag making at Primary period, first the vanadium in molten iron is oxidized into slag, simultaneously silicon, manganese, the also oxidized slag phase that enters of titanium in molten iron.After the oxidation of vanadium finishes, suspend blowing, vanadium slag is clawed, then add lime and other slag former slagging and producing steels, and then produce qualified molten steel.
Below two specific embodiments that in the present invention, microalloying is produced the method for HRB600 high-strength steel.
Embodiment 1
The microalloying that the present embodiment provides is produced the method for HRB600 high-strength steel, comprises the following steps:
(1), pack molten iron into converter, wherein the carbon content of molten iron is not less than 3.6%, and molten iron temperature is between 1280 DEG C-1330 DEG C, and silicone content is no more than 0.60%, P content and is no more than 0.100%, S content and is no more than 0.080%;
(2), molten iron pretreatment desulfurizing, below desulfurizing iron to 0.050%, and must take off the dregs in naked molten iron after desulfurization, make the band quantity of slag of molten iron be less than or equal to 0.5%, the molten iron temperature after desulfurization is not less than 1250 DEG C;
(3), molten iron thermometric and sampling, make into need the satisfy condition requirement of (1), (2) of composition, the temperature of stove molten iron;
(4), the add-on control of lime slag former and steel scrap:
Lime adding amount=2.2 × molten iron containing [Si] %+[P] %} × basicity × (iron water amount+pig)/lime effective CaO % content;
Adding amount of scrap steel=molten iron Intake Quantity × (15-20) %, if enter capping of stove molten iron temperature height, temperature is low to be removed the limit;
(5), converter smelting control Parameter Conditions is as follows:
Oxygen supply control: oxygen operating pressure 0.80MPMPa, oxygen-supplying amount is 16500Nm
3/ h, oxygen supply intensity 3.2Nm
3/ t.min, the intensity of bottom blowing nitrogen is 0.23m
3/ min.t;
Smelting temperature control: Primary period by temperature held stationary increase, reaction between carbon and oxygen arrive before control temperature below 1450 DEG C, to the later stage control terminal temperature 1620 DEG C of left and right;
(6), grate tapping steel
In the time that reaching the terminal control target in following table, smelting molten steel can tap:
1. end point carbon is controlled at 0.10-0.15%, and P, S all need to be controlled within 0.025%, and basicity R is controlled at 2.8-3.5; 2. tapping temperature is controlled at 1675 ± 5 DEG C, tapping time >=2.5min;
Need to continue blowing until various composition meets terminal control target if do not reach above-mentioned control target;
(7), alloying and microalloying control
The control of alloy addition sequence: alloy addition sequence is to start to add silicomanganese and ferrosilicon to carry out alloying to 1/3 o'clock in tapping, and then add ferro-niobium, ferrochrome, vanadium iron and ferrotianium and carry out microalloying, all alloys all added before tapping 3/4, ferro-niobium, ferrochrome, vanadium iron and these four kinds of micro alloying elements of ferrotianium must not load in mixture simultaneously, need classification, add in batches, wherein, alloy addition is: silicomanganese 25.5kg/t, ferrosilicon 8.0kg/t, ferro-niobium 2.0kg/t, ferrochrome 4.5kg/t, vanadium iron 3.0kg/t, ferrotianium 1.5kg/t;
(8), Argon modulation: it is 150mm apart from height at the bottom of tank that argon rifle inserts rifle head by large tank central position, and argon pressure is controlled at 0.40MPa.；
(9), obtain qualified molten steel.The smelting component according to the form below control of molten steel:
Embodiment 2
The microalloying that the present embodiment provides is produced the method for HRB600 high-strength steel, comprises the following steps:
(1), pack molten iron into converter, wherein the carbon content of molten iron is not less than 3.6%, and molten iron temperature is between 1280 DEG C-1330 DEG C, and silicone content is no more than 0.60%, P content and is no more than 0.100%, S content and is no more than 0.080%;
(2), molten iron pretreatment desulfurizing, below desulfurizing iron to 0.050%, and must take off the dregs in naked molten iron after desulfurization, make the band quantity of slag of molten iron be less than or equal to 0.5%, the molten iron temperature after desulfurization is not less than 1250 DEG C;
(3), molten iron thermometric and sampling, make into need the satisfy condition requirement of (1), (2) of composition, the temperature of stove molten iron;
(4), the add-on control of lime slag former and steel scrap:
Lime adding amount=2.2 × molten iron containing [Si] %+[P] %} × basicity × (iron water amount+pig)/lime effective CaO % content; Adding amount of scrap steel=molten iron Intake Quantity × (15-20) %, if enter capping of stove molten iron temperature height, temperature is low to be removed the limit;
(5), converter smelting control Parameter Conditions is as follows:
Oxygen supply control: oxygen operating pressure 0.90MPa, oxygen-supplying amount is 18500Nm
3/ h, oxygen supply intensity 4.0Nm
3/ t.min, the intensity of bottom blowing nitrogen is 0.30m
3/ min.t;
Smelting temperature control: Primary period by temperature held stationary increase, reaction between carbon and oxygen arrive before control temperature below 1450 DEG C, to the later stage control terminal temperature 1700 DEG C of left and right;
(6), grate tapping steel
In the time that reaching the terminal control target in following table, smelting molten steel can tap:
1. end point carbon is controlled at 0.10-0.15%, and P, S all need to be controlled within 0.025%, and basicity R is controlled at 2.8-3.5;
2. tapping temperature is controlled at 1675 ± 5 DEG C, tapping time >=2.5min;
Need to continue blowing until various composition meets terminal control target if do not reach above-mentioned control target;
(7), alloying and microalloying control
The control of alloy addition sequence: alloy addition sequence is to start to add silicomanganese and ferrosilicon to carry out alloying to 1/3 o'clock in tapping, and then add ferro-niobium, ferrochrome, vanadium iron and ferrotianium and carry out microalloying, all alloys all added before tapping 3/4, ferro-niobium, ferrochrome, vanadium iron and these four kinds of micro alloying elements of ferrotianium must not load in mixture simultaneously, need classification, add in batches, wherein, alloy addition is: silicomanganese 27.0kg/t, ferrosilicon 9.5kg/t, ferro-niobium 3.5kg/t, ferrochrome 6.5kg/t, vanadium iron 5.0kg/t, ferrotianium 3.0kg/t;
(8), Argon modulation: it is 200mm apart from height at the bottom of tank that argon rifle inserts rifle head by large tank central position, and argon pressure is controlled at 0.80MPa.；
(9), obtain qualified molten steel.The smelting component according to the form below control of molten steel:
The principle that niobium, chromium, vanadium, titanium micro-alloyedization improve reinforced steel bar strength is as follows:
These four kinds of niobium, chromium, vanadium and titaniums are all the yield strengths that are used for improving reinforcing bar by crystal grain thinning and precipitation strength.Niobium can form phase in the middle of the gap such as NbC or NbN in steel.In recrystallization process, because NbC, NbN are to anchoring of dislocation and to effects such as the migration of subgrain boundary stop, thereby greatly increased the time of recrystallize, the feature of Nb in steel improves austenitic recrystallization temperature exactly, thereby reach refine austenite crystal grain, put forward high-intensity object.Chromium can increase the hardening capacity of steel and have secondary hardening effect.Can improve the hardness of carbon steel and wear resistance and not make steel become fragile; Make steel have the effect of good high-temperature oxidation resistance and scale resistance dielectric corrosion, also increase the heat resistance of steel simultaneously.The effect of vanadium is by forming V (C, N) affect tissue and the performance of steel, mainly Precipitation in the cable body of austenite grain boundary can suppress austenitic recrystallize and stop grain growth in the operation of rolling, thereby plays intensity and the toughness of refinement cable body crystal grain, raising steel.Titanium is carbide, it and C have extremely strong avidity to form TiC, the TiC particle that a large amount of disperses that form in solidification of molten steel process distribute, the solid nucleus can become solidification of molten steel time, be beneficial to the crystallization of steel and the tissue of refinement steel, play the effect of strengthening.
Compared with prior art, microalloying provided by the invention is produced the method for HRB600 high-strength steel, can produce qualified HRB600 high-strength steel, has filled up the blank that China produces HRB600 high-strength steel.The HRB600 high-strength steel that the present invention produces for building trade after, the usage quantity of low level reinforcing bar will greatly reduce, use HRB600 high-strength steel compared with the HRB335, the HRB400 that mainly use at present, HRB500 grade reinforcing steel, can distinguish Saving steel amount 73.3%, 44.4% and 19.5%, there is the realistic meaning of energy-saving and emission-reduction, the annual like this 1,000 ten thousand tons of left and right of steel consumption of reducing, reduce 1,600 ten thousand tons of left and right of iron ore consumption, reduce 6,000,000 tons of standard coals of energy consumption, reduce 2,000 ten thousand tons of left and right of Carbon emission, there is very large social benefit.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (2)
1. microalloying is produced a method for HRB600 high-strength steel, it is characterized in that, comprises the following steps:
(1), pack molten iron into converter, wherein the carbon content of molten iron is not less than 3.6%, and molten iron temperature is between 1280 DEG C～1330 DEG C, and silicone content is no more than 0.60%, P content and is no more than 0.100%, S content and is no more than 0.080%;
(2), molten iron pretreatment desulfurizing, below desulfurizing iron to 0.050%, and must take off the dregs in naked molten iron after desulfurization, make the band quantity of slag of molten iron be less than or equal to 0.5%, the molten iron temperature after desulfurization is not less than 1250 DEG C;
(3), molten iron thermometric and sampling, make into need the satisfy condition requirement of (1), (2) of composition, the temperature of stove molten iron;
(4), the add-on control of lime slag former and steel scrap:
Lime adding amount=2.2 × molten iron containing [Si] %+[P] %} × basicity × (iron water amount+pig)/lime effective CaO % content;
Adding amount of scrap steel=molten iron Intake Quantity × (15～20) %, if enter capping of stove molten iron temperature height, temperature is low to be removed the limit;
(5), converter smelting control Parameter Conditions is as follows:
Oxygen supply control: oxygen operating pressure 0.80MP-0.90MPa, oxygen-supplying amount is 16500-18500Nm
3/ h, oxygen supply intensity 3.2-4.0Nm
3/ t.min, the intensity of bottom blowing nitrogen is 0.23-0.30m
3/ min.t;
Smelting temperature control: Primary period by temperature held stationary increase, reaction between carbon and oxygen arrive before control temperature below 1450 DEG C, to the later stage control terminal temperature at 1620-1700 DEG C;
(6), grate tapping steel
In the time that reaching following terminal control target, smelting molten steel can tap:
1. end point carbon is controlled at 0.10-0.15%, and P, S all need to be controlled within 0.025%, and basicity R is controlled at 2.8-3.5,
2. tapping temperature is controlled at 1675 ± 5 DEG C, tapping time >=2.5min;
Need to continue blowing until various composition meets terminal control target if do not reach above control target;
(7), alloying and microalloying control
The control of alloy addition sequence: alloy addition sequence is first to add silicomanganese and ferrosilicon to carry out alloying, and then add ferro-niobium, ferrochrome, vanadium iron and ferrotianium and carry out microalloying, wherein, alloy addition is: silicomanganese 25.5-27.0kg/t, ferrosilicon 8.0-9.5kg/t, ferro-niobium 2.0-3.5kg/t, ferrochrome 4.5-6.5kg/t, vanadium iron 3.0-5.0kg/t, ferrotianium 1.5-3.0kg/t; Alloy addition sequence is to start to add silicomanganese and ferrosilicon to carry out alloying to 1/3 o'clock in tapping, and then add ferro-niobium, ferrochrome, vanadium iron and ferrotianium and carry out microalloying, all alloys all added before tapping 3/4, ferro-niobium, ferrochrome, vanadium iron and these four kinds of micro alloying elements of ferrotianium must not load in mixture simultaneously, need classification, add in batches;
(8), Argon modulation;
(9), obtain qualified molten steel.
2. microalloying according to claim 1 is produced the method for HRB600 high-strength steel, it is characterized in that, in step (8), it is 150-200mm apart from height at the bottom of tank that argon rifle inserts rifle head by large tank central position, and argon pressure is controlled at 0.40-0.80MPa.
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| CN102796938B (en) * | 2012-08-25 | 2014-04-02 | 武钢集团昆明钢铁股份有限公司 | Method for increasing vanadium content of molten steel |
| CN104294001A (en) * | 2014-09-19 | 2015-01-21 | 中山市鸿程科研技术服务有限公司 | Converter steelmaking method |
| CN106048394B (en) * | 2016-08-02 | 2019-01-18 | 河北中重冷轧材料有限公司 | The formula and preparation method thereof of low-cost and high-quality smelting Q345B steel |
| CN111876693A (en) * | 2020-07-16 | 2020-11-03 | 舞阳钢铁有限责任公司 | Steel for steel rail and production method thereof |
| CN116694851B (en) * | 2023-05-26 | 2024-04-05 | 福建三宝钢铁有限公司 | High-nitrogen process method for deformed steel bar |
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| CN1970817A (en) * | 2006-12-07 | 2007-05-30 | 武汉钢铁(集团)公司 | High-strength deformed steel bar and method of manufacturing same |
| CN102071357A (en) * | 2011-01-05 | 2011-05-25 | 武钢集团昆明钢铁股份有限公司 | Nitrogenous niobium vanadium microalloying 500MPa and 550MPa high-intensity aseismic reinforcing steel bar and melting method |
| CN102383033A (en) * | 2011-11-08 | 2012-03-21 | 河北钢铁股份有限公司承德分公司 | 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof |
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| KR101149184B1 (en) * | 2010-08-30 | 2012-05-25 | 현대제철 주식회사 | METHOD OF MANUFACTURING THE HIGH STRENGTH STRUCTURAL STEEL OF TENSILE STRENGTH OF 750MPa GRADE AND HIGH STRENGTH AND THE STEEL USING THEREOF |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1970817A (en) * | 2006-12-07 | 2007-05-30 | 武汉钢铁(集团)公司 | High-strength deformed steel bar and method of manufacturing same |
| CN102071357A (en) * | 2011-01-05 | 2011-05-25 | 武钢集团昆明钢铁股份有限公司 | Nitrogenous niobium vanadium microalloying 500MPa and 550MPa high-intensity aseismic reinforcing steel bar and melting method |
| CN102383033A (en) * | 2011-11-08 | 2012-03-21 | 河北钢铁股份有限公司承德分公司 | 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof |
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