CN107699656A - A kind of ultra-low phosphoretic steel smelting process - Google Patents

A kind of ultra-low phosphoretic steel smelting process Download PDF

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Publication number
CN107699656A
CN107699656A CN201710885847.6A CN201710885847A CN107699656A CN 107699656 A CN107699656 A CN 107699656A CN 201710885847 A CN201710885847 A CN 201710885847A CN 107699656 A CN107699656 A CN 107699656A
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blowing
slag
steel
ultra
tmin
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不公告发明人
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Hefei Wisdom Longtuteng Intellectual Property Co Ltd
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Hefei Wisdom Longtuteng Intellectual Property Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention discloses a kind of smelting process of ultra-low phosphoretic steel.By first carrying out dephosphorizing pretreatment and then being operated using double slag process, including dephosphorization phase and blowing process, the dephosphorization phase：Dephosphorization smelting is carried out using the pre-slag that Dephosphorising agent and upper stove leave as slag making materials, obtains alkali converter slag；Blowing process：Once blow, oxygen flow suitably reduces during once blowing, bottom-blowing of converter intensity >=0.045Nm3/ (tmin), 6~7min of duration of blast is supplied oxygen, once blowing finishes releasing clinker, then adds new slag charge and carries out slag making again.Secondary blowing end point basicity of slag control is 3.5~4.5, FeO contents 18~25%, content of MgO 8~10%, 1600~1630 DEG C of outlet temperature, terminal C content 0.03~0.06%, special-purpose slag stop therefor is used before tapping, slag retaining cone is added after tapping 3/4,40~60% later stage slag of second of finishing blowing generation is left as to the slag making materials of lower stove steel.Using process above, can stablize converter terminal P controls below 0.005%.

Description

A kind of ultra-low phosphoretic steel smelting process
The application is application number 2015105484814, the applying date 2015 year 08 month 31, a kind of denomination of invention " ultralow phosphorus The divisional application of steel smelting method ".
Technical field
The invention belongs to metal material field of smelting, and in particular to a kind of ultra-low phosphoretic steel smelting process.
Background technology
Phosphorus is harmful element for most steel grades, it is necessary to be removed as much as possible in Steelmaking.Phosphorus is in steel Segregation is also easy to produce in process of setting, when phosphorus content is more than 0.015wt% in steel, the segregation of phosphorus sharply increases, and significantly reduces steel Low-temperature impact toughness and tempering toughness, improve the brittle transition temperature of steel, cause cold short, also deteriorate the welding performance of steel. Pipe line steel, oil well pipe steel, offshore platform steel, low-temperature (low temperature) vessel steel etc. are required to low phosphorus content, are less than for requirements such as 9Ni steel 0.003wt% ultralow phosphorus.At present, ultra-low phosphoretic steel dephosphorization requirement can not be met by being smelted using common process.
The method that industrial dephosphorization of molten iron uses dephosphorization under oxidizing atmosphere, Dephosphorising agent is generally using lime base slag system Dephosphorising agent. Lime base slag system raw material sources are wide, have very strong binding ability with the oxide of phosphorus, are widely used in actual steel and iron industry, because Its fusing point is high, so needing to be used cooperatively with fluxing agent.Conventional fluxing agent mainly has fluorite, and fluorite can reduce the glutinous of clinker Degree, fusion temperature, the slagging speed of dephosphorization phase clinker is improved, improve the dynamic conditions of dephosphorisation reaction, but fluorite is to converter Lining wear is serious, and also environment can be polluted, and avoids using fluorite so should try one's best.
The content of the invention
For above present situation, for overcome the deficiencies in the prior art, there is provided a kind of smelted using dephosphorization adds double slag process Smelt the method for ultra-low phosphoretic steel.
It is of the present invention it is a kind of produce ultra-low phosphoretic steel production method specific implementation step it is as follows：
The ultra-low phosphoretic steel smelting process includes dephosphorization phase and blowing process, wherein, in the dephosphorization phase, stayed with Dephosphorising agent and upper stove steel Under later stage slag come to carry out dephosphorization smelting to molten iron and steel scrap as slag making materials, dephosphorization slag charge is outwelled at the end of the dephosphorization phase； Dephosphorising agent includes lime, light dolomite and MICA.
Once blow：Oxygen rifle is opened blow before by bottom-blowing of converter intensity adjustment to >=0.045Nm3/ (tmin), before opening after blowing 1min top blast oxygen supply intensity is 3.0Nm3Oxygen supply intensity is reduced to 3.0Nm after/(tmin), rifle position 1.4m, 1min3/(t· Min) 70~80%, rifle position is promoted to 1.6~1.8m.Open blow after slag charge is added in 4min and finished, liquid steel temperature control At 1300~1400 DEG C, 6~7min of oxygen supply blowing carries rifle, proposes slagging after bottom blowing stirring 1min after rifle, and slagging is to being shown in there is a small amount of iron Water stops when escaping.
Secondary blowing：The secondary blowing of converter is opened blow before bottom blowing intensity is set as 0.037Nm3/ (tmin), oxygen rifle, which is opened, blows Oxygen supply intensity is set as 3.0Nm afterwards3/ (tmin), converting process 1.6~1.8m of rifle position, opens and slag charge is added after blowing, converting process Equilibrium heating, sublance determines after carbon thermometric rifle position being reduced to 1.3m for the first time until blowing end point, outlet temperature for 1600~ 1630 DEG C, clinker is released after secondary blowing, the 40~60% of production later stage slag is left as to the slag making material of lower stove steel Material, tapped after releasing clinker.
Tapping control：Tapping adds alloy to 1/3 or so, taps to being initially added into slag retaining cone after 3/4.By the 40 of production~ 60% later stage slag is left as the slag making materials of lower stove steel.
Wherein added slag charge is lime, light dolomite, fluorite, sintering back powder or iron in dephosphorization phase and second of blowing At least one of skin.
The amount of added material residue is according to obtained basicity of slag 1.8~2.2 in blowing for the first time, composition FeO and MnO in clinker Total content be 12~20%, content of MgO be 5~9% addition；The amount of slag charge is according to finishing slag basicity 3.5 added by second of blowing ~4.5, MgO8~10%, FeO18~25% with addition of.
Blowing for the first time obtains the index parameter of clinker and is：Basicity 1.8~2.2, FeO and MnO total content is in clinker 12~20%, content of MgO is 5~9%.
The index parameter that second blowing obtains terminal clinker is：Basicity 3.5~4.5, FeO contents 18 in clinker~ 25%, content of MgO 8~10%, C content 0.03~0.06%.
In blowing or blow for the first time for second in addition temperature range and regulation are controlled by adding iron sheet or sintering deposit Slag composition content.
According to an embodiment of the invention, the Dephosphorising agent of addition can including 10~35kg of steel per ton lime, steel per ton 2~ The MICA of 10kg light dolomite and 2~8kg of steel per ton.
According to an embodiment of the invention, can be in the process conditions of dephosphorization phase control：Oxygen lance position is 1.5~2.0m, Oxygen blast intensity is 2.4~3.0Nm3/ (tmin), oxygen blow duration are 250~500s, and bottom blowing intensity is 0.01~0.04Nm3/ (tmin), bottom blown gas is nitrogen or argon gas, and furnace temperature is 1350~1450 DEG C, and the molten iron of falling stove wraps by weight percentage Containing 2.8~3.5% C, 0.01~0.08% Si, 0.03~0.05% P, the basicity for the dephosphorized slag of falling stove is 1.8~2.5, Weight percentages of the MgO in the dephosphorized slag of falling stove is that weight percentages of 3.5~8%, the Fe in the dephosphorized slag of falling stove is 10 ~20%.
The present invention advantageous effects be：The technique, which solves those, can not use the pneumatic steelmaking car of duplex technique Between, the problem of ultra-low phosphoretic steel continuous production can not be realized, it is not necessary to transform original equipment, by adjusting process side Method, it can implement secondary blowing using single-turn stove and operate, eliminate scrap build cost；And the converter smelting cycle only needs to increase 4min, continuous and stable production is can be achieved with, has saved investment for trnasforming urban land to greatest extent, improves production efficiency；By rifle position and Sintering deposit or iron sheet carry out working the slag temperature, it is uniformly heated up, by slag charge come basicity in working the slag and each component content Deng cost is lower, and operation is simpler, conveniently, has preferable popularizing application prospect.
Brief description of the drawings
Fig. 1 is a kind of smelting process flow chart for producing ultra-low phosphoretic steel that the present invention is implemented；
Fig. 2 is the phosphorus content figure in each stage during a kind of smelting process for producing ultra-low phosphoretic steel that the present invention is implemented；
Embodiment
Smelt steel grade：9Ni
Specifically, in the dephosphorization phase, by the Dephosphorising agent comprising lime, light dolomite and MICA add in converter and with The later stage slag that upper stove steel leaves is smelted together as slag making materials, and deslagging processing is carried out at the end of the dephosphorization phase.According to The exemplary embodiment of the present invention, the Dephosphorising agent of addition may include 10~35kg of steel per ton lime, 2~10kg of steel per ton it is light The MICA of calcined dolomite and 2~8kg of steel per ton.
Converter is once blown：Tapping hole is put into special-purpose slag stop therefor.Open bottom-blowing of converter Flow-rate adjustment to 410Nm before blowing3/ H, open oxygen flow 27000Nm when blowing3/ h, rifle position 1.4m.Rifle position is promoted to 1.6~1.8m after 1min, flow is down to 21000Nm3/h.Lime adding amount according to basicity 2.2 with addition of, light dolomite according to MgO6% with addition of sintering deposit is added portionwise 3.2 tons, blowing carries rifle in 395 seconds.
First time blowing end point molten bath composition and temperature are shown in Table 1
1 composition of steel of blowing end point half of table and temperature
C (%) Si (%) Mn (%) P (%) S (%) Temperature DEG C
Embodiment 1 2.20 0.102 0.15 0.021 0.010 1352
Embodiment 2 2.22 0.103 0.10 0.025 0.010 1360
Embodiment 3 2.35 0.105 0.12 0.023 0.011 1336
Embodiment 4 2.43 0.106 0.13 0.024 0.012 1346
Converter slagging：Carry and converter is placed in " 0 " degree position after rifle, after bottom blowing stirring 1min, implement converter slagging.Slagging is arrived Stop when seeing and thering is a small amount of molten iron to escape.
The secondary blowing of converter：By bottom blowing Flow-rate adjustment to 330Nm before blowing3/ h, the regulation of top blast oxygen flow are arrived 27000Nm3/h.Converting process 1.6~1.8m of rifle position, lime adding amount according to end-point alkalinity 4.5 with addition of, light dolomite according to MgO9% with addition of, according to clinker situation and process heating situation add 5.2 tons of sintering deposit successively.After sublance determines carbon thermometric for the first time Rifle position is reduced to 1.3m, continues the 115 seconds catch carbons that blow, and implements to determine carbon, thermometric operation before tapping.
Converter terminal contents temperature is shown in Table 2.
The secondary blowing end point composition of the converter of table 2 and temperature
Slag-stopping tapping：Normal tapping pattern is taken during tapping, alloy (750kg containing manganese metal, aluminium manganese are added after tapping 1/3 Iron 125kg, aluminium block 50kg), slag retaining cone is initially added into during tapping 3/4, and pushing off the slag success, and leave 40~60% later stage slag and make For the slag making materials of next stove.
LF and VD refining treatments are carried out to molten steel after tapping, ladle composition and final finished composition are shown in Table 3 after tapping.
Ladle composition and final finished composition after table 3 is tapped
As shown in Table 3, final finished P content≤0.006% of embodiment 1,2,3,4.
A kind of smelting process of ultra-low phosphoretic steel provided by the present invention is described in detail above.It is used herein Specific case is set forth to the principle and embodiment of the present invention, and the explanation of above example is only intended to help and understands this The method and its core concept of invention.It should be pointed out that for those skilled in the art, this hair is not being departed from On the premise of bright principle, some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into power of the present invention In the protection domain that profit requires.

Claims (8)

1. a kind of smelting process for producing ultra-low phosphoretic steel, it is characterised in that comprise the following steps：
Step S101, the dephosphorization phase：Come to carry out molten iron and steel scrap using the later stage slag that Dephosphorising agent and upper stove leave as slag making materials Dephosphorization is smelted, and releases converter slag；
Step S102, a blowing process：Once blown, oxygen rifle is opened blow before bottom-blowing of converter intensity is set as >=0.045Nm3/ (tmin), open to blow to add slag charge in rear 4min and finish, open the preceding 1min oxygen supply intensities after blowing and be set as 3.0Nm3/(t· Min), rifle position 1.4m；Oxygen supply intensity is reduced to 3.0Nm after 1min3The 70~80% of/(tmin), rifle position is promoted to 1.6~ 1.8m, oxygen supply blowing carry rifle after totally 6~7min, propose slagging after bottom blowing stirring 1min after rifle；Duration of blast is 6~7min, Oxygen supply intensity is reduced to 3.0Nm after blowing 1min3The 70~80% of/(tmin), a blowing end point temperature 1300~1400 DEG C, slagging when having molten iron effusion to stopping after once blowing；Once blowing added by slag charge amount according to once blowing finishing slag alkali Spend for 1.8~2.2, MgO5~9% with addition of；
Step S103, the secondary blowing process：Add new slag charge and carry out secondary blowing：The secondary blowing of converter is opened blow before by bottom blowing intensity It is set as 0.037Nm3/ (tmin), oxygen rifle, which is opened, blows rear oxygen supply intensity and is set as 3.0Nm3/ (tmin), converting process rifle position 1.6~1.8m, open and new slag charge is added after blowing, the balanced heating of converting process, sublance reduces rifle position after determining carbon thermometric for the first time To 1.3m until blowing end point, outlet temperature are 1600~1630 DEG C；
Step S104, tapped after secondary blowing, tap and add alloy to 1/3 or so, tapped to being initially added into after 3/4 Slag retaining cone, 40~60% later stage slag of second of blowing production is left as to the slag making materials of lower stove steel.
A kind of 2. ultra-low phosphoretic steel smelting process as claimed in claim 1, it is characterised in that：The Dephosphorising agent added in step S101 The MICA of lime including 10~35kg of steel per ton, 2~10kg of steel per ton light dolomite and 2~8kg of steel per ton.
A kind of 3. ultra-low phosphoretic steel smelting process described in claim 1, it is characterised in that：The molten iron added in step S101 is by weight Measure percentages include 4.0~4.5% C, 0.25~0.60% Si, 0.20~0.40% Mn, 0.10~0.12% P, the temperature of molten iron is 1250~1320 DEG C, and the weight ratio of molten iron and steel scrap is 6:1~12：1.
A kind of 4. ultra-low phosphoretic steel smelting process as claimed in claim 1, it is characterised in that：The dephosphorized slag of falling stove in step S101 Basicity is that weight percentages of 1.8~2.5, the MgO in the dephosphorized slag of falling stove is weights of 3.5~8%, the Fe in the dephosphorized slag of falling stove It is 10~20% to measure percentage composition.
A kind of 5. ultra-low phosphoretic steel smelting process as claimed in claim 1, it is characterised in that：Secondary blowing obtains in step S103 The index parameter of clinker is：Basicity 1.8~2.2, FeO and MnO total content is 12~20% in clinker, content of MgO is 5~ 9%, C content 0.03~0.06%.
A kind of 6. ultra-low phosphoretic steel smelting process according to claim 1, it is characterised in that：Secondary blowing institute in step S103 Add the amount of new slag charge according to finishing slag basicity 3.5~4.5, MgO8~10%, FeO18~25% with addition of.
A kind of 7. ultra-low phosphoretic steel smelting process as claimed in claim 1, it is characterised in that：During step S101 dephosphorization is smelted： Oxygen lance position is 1.5~2.0m, and oxygen blast intensity is 2.4~3.0Nm3/ (tmin), and oxygen blow duration is 250~500s, and bottom blowing is strong Spend for 0.01~0.04Nm3/ (tmin), bottom blown gas are nitrogen or argon gas, and furnace temperature is 1350~1450 DEG C.
A kind of 8. ultra-low phosphoretic steel smelting process as described in any one of claim 1 to 7, it is characterised in that：Described slag charge is One or more of mixing in lime, light dolomite, fluorite, sintering back powder or iron sheet.
CN201710885847.6A 2015-08-31 2015-08-31 A kind of ultra-low phosphoretic steel smelting process Pending CN107699656A (en)

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Cited By (2)

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CN109280734A (en) * 2018-11-30 2019-01-29 武汉钢铁集团鄂城钢铁有限责任公司 A kind of smelting process of middle high alloy ultra-low phosphoretic steel
CN115747406A (en) * 2022-12-01 2023-03-07 湖南华菱涟源钢铁有限公司 Ultra-low phosphorus steel converter smelting method

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CN107365886B (en) * 2016-05-13 2019-03-26 上海梅山钢铁股份有限公司 A kind of method of converter high temperature dephosphorization
CN106282477B (en) * 2016-08-23 2018-06-19 唐山不锈钢有限责任公司 A kind of smelting process of ultra-low phosphoretic steel
CN108715932A (en) * 2018-06-19 2018-10-30 青海百通高纯材料开发有限公司 A kind of smelting process of low-phosphorous ferrosilicon
CN109593907B (en) * 2019-01-30 2021-03-09 北京首钢股份有限公司 Method for smelting low-phosphorus steel
CN111778377A (en) * 2019-04-04 2020-10-16 上海梅山钢铁股份有限公司 Smelting method with high scrap ratio and low cost for converter
CN116103565B (en) * 2022-12-16 2024-09-13 武安市裕华钢铁有限公司 Production method of low-cost S350GD hot rolled steel strip
CN117965840B (en) * 2024-03-29 2024-06-04 江苏省沙钢钢铁研究院有限公司 Converter phosphorus control smelting method of low-temperature steel and production method of high-quality low-temperature steel

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CN115747406A (en) * 2022-12-01 2023-03-07 湖南华菱涟源钢铁有限公司 Ultra-low phosphorus steel converter smelting method

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