CN106148630B - A kind of method of the low-phosphorous low-sulfur molten steel of converter smelting - Google Patents
A kind of method of the low-phosphorous low-sulfur molten steel of converter smelting Download PDFInfo
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Abstract
The technical issues of the invention discloses a kind of methods of the low-phosphorous low-sulfur molten steel of converter smelting, mainly solve in the prior art, and w [P]≤0.0080%, w [S]≤0.0040% are difficult to realize in the converter tapping ladle chemistry of converter smelting production.The technical scheme is that：A kind of method of the low-phosphorous low-sulfur molten steel of converter smelting, includes the following steps：Add steel scrap, hot metal charging；Desiliconization, dephosphorization are bessemerized, arranges pre-slag；Bessemerize decarburization；Converter tapping；Slag splashing and deslagging.The present invention is by limiting converter metal charge and slag making ratio of adjuvant and sulfur content, using the control for bessemerizing desiliconization, dephosphorization phase and carbon period, play each stage dephosphorization of converter, desulphurizing ability, and tapping process early period, the method for controlling ash-retention efficiency, realizes the smelting of w [P]≤0.0080%, w [S]≤0.0040% in converter tapping ladle chemistry.The process stabilizing of the method for the present invention, reduces production cost.
Description
Technical field
The present invention relates to a kind of method of converter smelting molten steel, the side of more particularly to a kind of low-phosphorous low-sulfur molten steel of converter smelting
Method belongs to converter steeling technology field.
Background technology
Phosphorus, sulphur are the harmful elements in most steel grades.In recent years, some steel grades simultaneously propose element p and s
Very high requirement.Such as automobile body outer board steel, w in steel [P]≤0.010%, w [S]≤0.0060% are generally required.At present, it is low-phosphorous
The representative production method of low-sulfur steel is to carry out deep dephosphorization in converter, then carries out deep desulfurization in LF stoves.Existing for the technique
Deficiency is that the low-phosphorous low nitrogen steel water of converter smelting can be contaminated in LF stove depth desulfurization process, mainly since molten steel desulfurizing needs
First deoxidation first obtains and carries out deoxidation to molten steel and ladle slag, makes reproducibility slag desulfurization.Therefore, the phosphate in ladle slag can be gone back
Original enters in molten steel, causes rephosphorization of molten steel；The molten steel of deoxidation simultaneously inhales the enhancing of nitrogen ability, and desulfurization needs stronger stirring, also increases
Molten steel has been added to inhale nitrogen.Therefore, the exploitation of the low-phosphorous low-sulfur molten steel technology of converter smelting is gradually taken seriously.
Ore deposit cost is matched to reduce by some iron and steel enterprises, and phosphorus content is 0.12%~0.16% in molten iron, and molten iron pretreatment carries out
Compound powder injection desulphurization, molten iron is without desiliconization and dephosphorization；It is less than 0.012% steel grade using converter single slag process production phosphorus content, turns
Stove ton steel lime consumption is more than 70kg, and the consumption of ton steel calcined magnesite ball is more than 16kg, and the oxidisability of converter terminal clinker is strong, tapping
Temperature is low（Less than 1630 DEG C）, smelting cost height.
Converter smelting Low-phosphorus Steel technology disclosed in existing literature, the technology of low phosphorus steel by smelting in a converter represent
Property technology for converter double slag dephosphorization, be the characteristics of being conducive to dephosphorization using converter initial stage, carried out again after dephosphorized slag is outwelled
Decarburization is smelted, i.e., dephosphorized slag and decarbonized slag is made respectively, to realize the smelting of converter Low-phosphorus Steel；Such as, Chinese patent CN
101363068 A、CN 102559985 A、CN 102534098 A、CN 102634629 A、CN 102212643 A、CN
103103308 A and 103194564 A of CN disclose converter double slag dephosphorization process control method from different level, deposit
The problem of for converter terminal use lower temperature（Less than 1650 DEG C）Control, converter cold melt can influence converter desulfurization degree and
Extend refining furnace process cycle；Meanwhile partial monopoly converter terminal is controlled using strong oxidizing property, is unfavorable for Cleanliness of Molten Steel control
System.Chinese patent CN 101363068 A, CN 102534098 A, CN 103103308 A and 102212643 A of CN to converter
Process ash-retention efficiency is described and controls, but specifically how accurately to measure and control ash-retention efficiency not illustrate then, not
See that such technology discloses, also have no that the control technology in terms of converter smelting low-sulfur molten steel discloses；Chinese Patent Application No. is
201410233273.0 disclose " a kind of control method of deslagging converter less-slag melting early period ", the patent by desiliconization,
The dephosphorization phase smelts control and deslagging control early period so that converter pre-slag dephosphorization rate reaches more than 60%, excludes clinker weight and accounts for always
The 50%~70% of clinker weight achievees the purpose that converter dephosphorization early period and reduces converter slag-making supplementary product onsumption.
Invention content
The object of the present invention is to provide a kind of methods of the low-phosphorous low-sulfur molten steel of converter smelting, mainly solve prior art transfer
Stove is smelted the technology being difficult to realize of w [P]≤0.0080%, w [S]≤0.0040% in the converter tapping ladle chemistry of production and is asked
Topic.
The technical solution adopted by the present invention is：
A kind of method of the low-phosphorous low-sulfur molten steel of converter smelting, includes the following steps：
A, using top and bottom combined blown converter smelting, the weight percent of the raw material composition of input metal major ingredient is molten iron 88%
~94%, surplus is light-duty steel scrap, w [P]≤0.16%, w [S]≤0.0015% in molten iron chemical composition, light-duty steel scrap chemical composition
Middle w [S]≤0.0060%；
B, converter slag-making auxiliary material is added in when converter oxygen gun leads to oxygen point fire and carries out slag making, converter slag-making auxiliary material is quick lime,
W [S] in w [S]≤0.035%, iron ore in w [S]≤0.020%, calcined magnesite ball in calcined magnesite ball, iron ore, wherein quick lime
≤0.018%；
C, desiliconization, dephosphorization are bessemerized, converter desiliconization, the oxygen-supplying amount of dephosphorization phase is smelt the total oxygen-supplying amount quality percentage of heat
The 26%~34% of ratio, oxygen supply intensity control are 2.7~3.3Nm3/（min·t）；The control of bottom-blowing of converter argon flow amount 0.05~
0.08Nm3/（min·t）；Rifle position → low rifle position → high rifle position on the basis of converter desiliconization, the control of the rifle position of dephosphorization phase, first using base
Quasi- rifle position, control blowing oxygen quantity are the 4%~6% of total oxygen-supplying amount mass percent；Again using low rifle position, control blowing oxygen quantity is total oxygen supply
Measure the 18%~22% of mass percent；Finally again using high rifle position, control blowing oxygen quantity for total oxygen-supplying amount mass percent 4%~
6%；Converter desiliconization, the addition of dephosphorization phase quick lime, when entering w [Si]≤0.3% in stove molten iron, the ton steel addition of quick lime is
3~12kg；When entering 0.3% ＜ w [Si]≤0.7% in stove molten iron, the ton steel addition of quick lime is 12~26kg/ tons of steel；Enter stove
In molten iron during 0.7% ＜ w [Si], the ton steel addition of quick lime is 26~34kg/ tons of steel；The ton steel addition of calcined magnesite ball is 3
~8kg, the ton steel addition of iron ore is 0~40kg/ tons of steel；
D, converter desiliconization, dephosphorization phase terminate to carry out deslagging, and half steel molten steel, deslagging phase increase converter bottom are obtained after deslagging
Wind drift amount, bottom-blowing of converter flow control are 0.08~0.15Nm3/（min·t）, ash-retention efficiency control is 70%~80%；
E, decarburization is bessemerized, the oxygen-supplying amount of carbon period is smelt the total oxygen-supplying amount mass percent of heat 66%~74%,
Oxygen supply intensity control is 3.1~3.6Nm3/（min·t）, bottom-blowing of converter flow control is in 0.02~0.05Nm3/（min·t）；Turn
The rifle position control of stove carbon period is high rifle position → benchmark rifle position → low rifle position, first using high rifle position, strengthens slugging, controls blowing oxygen quantity
31%~35% for total oxygen-supplying amount mass percent；Again using benchmark rifle position, control blowing oxygen quantity is total oxygen-supplying amount mass percent
28%~36%；Stirring is finally strengthened using low rifle position again, reduces FeO contents in clinker, control blowing oxygen quantity is total oxygen-supplying amount matter
Measure the 5%~7% of percentage；The ton steel addition of quick lime is 10~25kg, and the ton steel addition of calcined magnesite ball is 3~8kg, iron
The ton steel addition of ore is 0~10kg；
F, in converter steelmaking process the carbon oxygen product value of molten steel control, the carbon oxygen product value control of molten steel is 0.0024 in converter
~0.0030, the carbon oxygen ponding of molten steel puts down the mixing effect that can effectively reflect bottom-blowing of converter, and the carbon oxygen product of molten steel is 0.0024
Bottom-blowing of converter best results when~0.0030 are conducive to smelting process and steadily reduce splash, heretofore described carbon oxygen product value
Refer to the product value of the mass percentage content of the carbon of molten steel and the mass percentage content of steel oxygen in water in converter；
G, it taps after bessemerizing；
H, slag splashing is carried out after converter tapping, the stove being unbonded on converter lining is outwelled after slag splashing
Slag.
Step of the present invention is repeated, starts the smelting of next stove molten steel.
Further, in step b of the present invention, the weight percent of calcined magnesite ball chemical composition is MgO 58%~70%, CaO
20%~30%, SiO2≤ 5%, scaling loss≤10%.
In step c of the present invention, desiliconization is bessemerized, dephosphorization phase clinker dual alkalinity is 1.3~1.7, FeO mass in clinker
Score is 15%~25%；Bath temperature is 1350~1400 DEG C.
It is preceding using the weighing equipment on steel slag tank and the slag ladle weight display on converter grate platform in step d of the present invention
Ash-retention efficiency can be accurately controlled during phase deslagging.
In step e of the present invention, decarbonized slag is bessemerized（Converter terminal slag）Dual alkalinity is 4.5~5.5, MgO in clinker
Mass fraction is 9.0%~11.0%；Converter terminal molten steel dissociates w [O]≤0.070%；Converter terminal temperature 1660 DEG C~1690
℃。
In step c, e of the present invention, converter oxygen gun benchmark rifle position is H0+H0* (0.12~0.18), high rifle position are H0+H0*
(0.2~0.5), low rifle position are H0+H0* (0.05~0.10), H0For steel water surface elevation in converter.
Quick lime is the metallurgical quick lime of converter smelting molten steel in converter slag-making auxiliary material of the present invention.
The present invention is low using converter temperature early period, the characteristics of conducive to dephosphorization, makes dephosphorized slag early period, passes through smelting process control
System removes 70% or so of phosphorus element content in molten iron；The pre-slag stage is arranged, by increasing bottom blowing flow, and using on steel slag tank
Weighing equipment, control high ash-retention efficiency；In converter carbon period, smelting process slag is changed, converter terminal controls certain oxidisability
And temperature, further remove molten steel phosphorus method, realize w [P] in the tapping ladle chemistry of converter smelting≤
0.0080%。
The present invention controls coming for molten steel sulfur content by limiting converter metal charge and slag making ratio of adjuvant and sulfur content
Source；By bessemerizing the deslagging of desiliconization, the slag making of dephosphorization phase and early period, SiO is poured out2The high clinker of content, makes conducive to the later stage
The converter terminal slag of high alkalinity is made with less slag making auxiliary material, reduces the amount of bringing into of slag making auxiliary material sulphur；By converter terminal high temperature,
High alkalinity clinker and the control compared with low oxidative molten steel improve the desulphurizing ability of converter terminal clinker so that converter terminal sulphur
Distribution ratio（LS=w(S)/w[S]）For 3~7 method, realize w [S] in the tapping ladle chemistry of converter smelting≤
0.0040%。
The present invention has following good effect compared with prior art：
1st, the present invention has broken the technical bottleneck of the low-phosphorous low-sulfur molten steel of existing converter smelting, realizes converter tapping molten steel
A w [P]≤0.0080% in studying point, w [S]≤0.0040% molten steel smelting.
2nd, the method for the present invention process stabilizing, ladle chemistry smelting shoot straight, and reduce the life of low-phosphorous low-sulfur molten steel
Produce cost.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
Embodiment as shown in table 1 to table 5, using 150 tons of the top and bottom combined blown converter smelting trade mark as SEDDQ-1 car inner plates
For steel, converter steelmaking process bottom blown gas is argon gas, and concrete operations are as follows：
1 converter smelting metal charge of the present invention of table, slag making ratio of adjuvant and composition
2 converter smelting desiliconization of the present invention of table, dephosphorization phase technological parameter
3 deslagging converter smelting early period technological parameter of the present invention of table
4 converter smelting carbon period technological parameter of the present invention of table
5 converter smelting endpoint index of the present invention of table
The embodiment of the present invention 1~4, the loss per ton steel of converter smelting lime be respectively 32.9kg, 28.9kg, 28.9kg and
36.0kg；The loss per ton steel of calcined magnesite ball is respectively 10.9kg, 12kg, 9.6kg and 10.8kg；Converter tapping ladle chemistry
Middle w [P] is respectively 0.0062%, 0.0059%, 0.0074% and 0.0053%；W [S] is respectively in converter tapping ladle chemistry
0.0032%th, 0.0031%, 0.0027% and 0.0028%；It is 100% that converter molten steel, which is smelt rate, w in converter tapping ladle chemistry
[P]≤0.0080%, w [S]≤0.0040% reduce the production cost of low-phosphorous low-sulfur molten steel.
Claims (4)
1. a kind of method of the low-phosphorous low-sulfur molten steel of converter smelting, it is characterized in that, the method includes the following steps：
A, using top and bottom combined blown converter smelting, the weight percent of the raw material composition of input metal major ingredient is, molten iron for 88%~
94%, surplus is light-duty steel scrap, w [P]≤0.16%, w [S]≤0.0015% in molten iron chemical composition, light-duty steel scrap chemistry into
W [S]≤0.0060% in point；
B, converter slag-making auxiliary material is added in when converter oxygen gun leads to oxygen point fire and carries out slag making, converter slag-making auxiliary material is quick lime, light-burned
W [S] in w [S]≤0.035%, iron ore in w [S]≤0.020%, calcined magnesite ball in magnesium ball, iron ore, wherein quick lime≤
0.018%；
C, desiliconization, dephosphorization are bessemerized, converter desiliconization, the oxygen-supplying amount of dephosphorization phase are to smelt the total oxygen-supplying amount mass percent of heat
26%~34%, oxygen supply intensity control is 2.7~3.3Nm3/(min·t)；The control of bottom-blowing of converter argon flow amount 0.05~
0.08Nm3/(min·t)；Rifle position → low rifle position → high rifle position on the basis of converter desiliconization, the control of the rifle position of dephosphorization phase, first using base
Quasi- rifle position, control blowing oxygen quantity are the 4%~6% of total oxygen-supplying amount mass percent；Again using low rifle position, control blowing oxygen quantity is supplied to be total
The 18%~22% of oxygen amount mass percent；Finally again using high rifle position, control blowing oxygen quantity is total oxygen-supplying amount mass percent
4%~6%；Converter desiliconization, the addition of dephosphorization phase quick lime, when entering w [Si]≤0.3% in stove molten iron, the ton steel of quick lime
Addition is 3~12kg；When entering 0.3% ＜ w [Si]≤0.7% in stove molten iron, the ton steel addition of quick lime is 12~26kg/
Ton steel；When entering 0.7% ＜ w [Si] in stove molten iron, the ton steel addition of quick lime is 26~34kg/ tons of steel；The ton of calcined magnesite ball
Steel addition is 3~8kg, and the ton steel addition of iron ore is 0~40kg/ tons of steel；The converter oxygen gun benchmark rifle position is H0+
H0* (0.12~0.18), high rifle position are H0+H0* (0.2~0.5), low rifle position are H0+H0* (0.05~0.10), H0For in converter
Steel water surface elevation；
D, converter desiliconization, dephosphorization phase terminate to carry out deslagging, obtain half steel molten steel after deslagging, bottom-blowing of converter flow control is
0.08~0.15Nm3/ (mint), ash-retention efficiency control are 70%~80%；
E, decarburization is bessemerized, the oxygen-supplying amount of carbon period is smelt the total oxygen-supplying amount mass percent of heat 66%~74%, is supplied
Oxygen strength control is 3.1~3.6Nm3/ (mint), bottom-blowing of converter flow control is in 0.02~0.05Nm3/(min·t)；Converter
The rifle position control of carbon period is high rifle position → benchmark rifle position → low rifle position, first using high rifle position, strengthens slugging, control blowing oxygen quantity is
The 31%~35% of total oxygen-supplying amount mass percent；Again using benchmark rifle position, control blowing oxygen quantity is total oxygen-supplying amount mass percent
28%~36%；Finally again using low rifle position, strengthen stirring, control blowing oxygen quantity for total oxygen-supplying amount mass percent 5%~
7%；The ton steel addition of quick lime is 10~25kg, and the ton steel addition of calcined magnesite ball is 3~8kg, and the ton steel of iron ore adds
Enter amount for 0~10kg；The converter oxygen gun benchmark rifle position is H0+H0* (0.12~0.18), high rifle position are H0+H0* (0.2~
0.5), low rifle position is H0+H0* (0.05~0.10), H0For steel water surface elevation in converter；
F, the carbon oxygen product value control of molten steel is 0.0024~0.0030 in converter steelmaking process；
G, it taps after bessemerizing；
H, slag splashing is carried out after converter tapping, the clinker being unbonded on converter lining is outwelled after slag splashing.
2. a kind of method of the low-phosphorous low-sulfur molten steel of converter smelting as described in claim 1, it is characterized in that, the calcined magnesite ball
The weight percent of chemical composition is MgO 58%~70%, CaO 20%~30%, SiO2≤ 5%, scaling loss≤10%.
3. a kind of method of the low-phosphorous low-sulfur molten steel of converter smelting as described in claim 1, it is characterized in that, in the step c,
Bessemerize desiliconization, dephosphorization phase clinker dual alkalinity is 1.3~1.7, FeO mass fractions are 15%~25% in clinker；Molten bath
Temperature is 1350~1400 DEG C.
4. a kind of method of the low-phosphorous low-sulfur molten steel of converter smelting as described in claim 1, it is characterized in that, in the step e,
It is 4.5~5.5 to bessemerize decarbonized slag dual alkalinity, and MgO mass fractions are 9.0%~11.0% in clinker；Converter terminal steel
Water dissociates w [O]≤0.070%；1660 DEG C~1690 DEG C of converter terminal temperature.
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| CN106242524A (en) * | 2016-07-22 | 2016-12-21 | 佛山石湾华鹏陶瓷有限公司 | A kind of pure white polished glazed tile and preparation method thereof |
| CN107604120B (en) * | 2017-09-12 | 2019-02-19 | 攀钢集团攀枝花钢铁研究院有限公司 | The extremely low extremely low sulphur method for making steel of phosphorus |
| CN109022670A (en) * | 2018-07-20 | 2018-12-18 | 首钢集团有限公司 | A kind of converter steel making method producing ultra-low phosphoretic steel |
| CN110938726A (en) * | 2018-09-21 | 2020-03-31 | 上海梅山钢铁股份有限公司 | Method for smelting low-phosphorus molten steel by converter |
| CN110042189B (en) * | 2019-04-18 | 2021-01-12 | 宁波钢铁有限公司 | Converter slagging method for efficiently dephosphorizing |
| CN110273043B (en) * | 2019-06-17 | 2021-05-25 | 首钢集团有限公司 | Dephosphorization process for molten steel of converter |
| CN112111622A (en) * | 2019-06-21 | 2020-12-22 | 上海梅山钢铁股份有限公司 | Blowing method for converter with low molten iron consumption |
| CN112126737B (en) * | 2019-06-24 | 2022-04-15 | 上海梅山钢铁股份有限公司 | Production method of low-sulfur alloy molten steel |
| CN111705265A (en) * | 2020-06-29 | 2020-09-25 | 张家港联峰钢铁研究所有限公司 | Steel for automobile anti-skid chains in alpine regions and converter smelting process of steel |
| CN111926139B (en) * | 2020-08-27 | 2021-06-29 | 北京科技大学 | Method for prolonging service life of converter lining during production of low-carbon low-phosphorus steel |
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| CN102899443A (en) * | 2012-10-23 | 2013-01-30 | 秦皇岛首秦金属材料有限公司 | Process for smelting low-phosphorous molten iron |
| CN102965466A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Technology for improving slag pouring quantity of converter in stage of dephosphorization |
| CN103194564A (en) * | 2013-03-25 | 2013-07-10 | 济钢集团有限公司 | Process for producing ultra-low phosphorus steel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899443A (en) * | 2012-10-23 | 2013-01-30 | 秦皇岛首秦金属材料有限公司 | Process for smelting low-phosphorous molten iron |
| CN102965466A (en) * | 2012-11-21 | 2013-03-13 | 首钢总公司 | Technology for improving slag pouring quantity of converter in stage of dephosphorization |
| CN103194564A (en) * | 2013-03-25 | 2013-07-10 | 济钢集团有限公司 | Process for producing ultra-low phosphorus steel |
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