CN108754063A - A kind of H08A steel series dephosphorization production technology - Google Patents
A kind of H08A steel series dephosphorization production technology Download PDFInfo
- Publication number
- CN108754063A CN108754063A CN201810512795.2A CN201810512795A CN108754063A CN 108754063 A CN108754063 A CN 108754063A CN 201810512795 A CN201810512795 A CN 201810512795A CN 108754063 A CN108754063 A CN 108754063A
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- Prior art keywords
- slag
- dephosphorization
- added
- iron
- steel
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Classifications
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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
- C21C5/32—Blowing from above
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of H08A steel series dephosphorization production technologies comprising following steps：Iron making feeds：Lime is added before iron making, iron scale is added with steel scrap or sinter return fine carries out bedding and padding；When iron making terminates to start blowing, iron scale and partial supplementary material light dolomite is added；Slag making dephosphorization：In oxygen rifle converting process, lime is added, in 1.5~1.7 ranges, later stage basicity controls in 2.5~2.8 ranges for basicity control early period, rationally controls rifle position, and double slag operation is combined to carry out dephosphorization.Technical solution according to the present invention can reach the standard of ultralow phosphorus, while lime consumption there is blow loss to reduce, steel technology reduces, converter terminal first-hit yield improves, being capable of the good results such as extending furnace lining life in controlled range in smelting process.
Description
Technical field
The present invention relates to iron and steel smelting technology field more particularly to a kind of H08A steel series dephosphorization production technologies.
Background technology
Phosphorus needs the harmful element removed when being refining overwhelming majority steel grade, generally requires phosphorus content to be less than 0.03%, contains
When phosphorus amount is high, the moulding and impact flexibility of steel can be reduced, when low temperature, it may appear that the phenomenon that " cold short ", therefore dephosphorization is converter refining
One of main task of steel generally uses oxygen top-blown converter dephosphorization mode, using single slag process or double slags in the prior art
Method carries out slag making operation, and dephosphorization efficiency has up to efficiency 85%~95% since finishing slag basicity is high, slag temperature is high, FeO contents are high
Help lime fusing slagging early period and dephosphorization, advantages, the component requirements of most steel grades can be met, but to some spies
In 0.005% low-carbon steel grade below, traditional operation technology is difficult to complete for the steel grade of other component requirements, especially phosphorus sulfur content,
If grasping misoperation simultaneously, the big spray of iron making easily occurs, opens and blows the problems such as being not easy ignition, splash serious, furnace bottom rising, so
A kind of effective and feasible technique is needed to substitute former technique.
Invention content
The purpose of the present invention is to provide a kind of H08A steel series dephosphorization production technologies, by controlling the basicity of molten steel,
And double slag operation dephosphorization is combined, realize the stabilized production of H08A steel series low costs.
In order to achieve the above objectives, the technical scheme is that：
A kind of H08A steel series dephosphorization production technology comprising following steps：
(1) iron making feeds：Lime is added before iron making, iron scale is added with steel scrap or sinter return fine carries out bedding and padding；It converts
When iron terminates to start blowing, iron scale and partial supplementary material light dolomite is added；
(2) slag making dephosphorization：In oxygen rifle converting process, lime is added, early period, basicity controlled in 1.5~1.7 ranges, after
Phase basicity controls in 2.5~2.8 ranges, rationally controls rifle position, and double slag operation is combined to carry out dephosphorization.
The double slag operation specifically includes：
Blow 2400~3200Nm3 of oxygen amount, when playing slag in stove, and has excessive slag sign to occur, while coal gas detection CO is dense
Degree reaches 40~50m3When/min, rifle deslagging is proposed, pre-slag pours out 2/5~3/5；
After early period is finished down slag, second of slag making is carried out, raises oxygen lance position, promotes to generate FeO, ensures FeO in finishing slag
For content in 20%~25% range, the content of MgO could form low melting point in 9~12% ranges, be easy to the slag of dephosphorization
System.
Further, in order to promote slugging, and phosphorus, the sulphur in molten iron are removed to greatest extent, it is preceding in converting process
Phase rifle position, which should control 30 seconds before 2.5~3.0m, deslagging, reduces rifle position to 2.0~1.8m.
Further, it is calculated according to hot metal composition, and steel-making slagging amount, the lime addition before iron making is 13.3kg/
The amount of t, iron scale or sinter return fine is 20kg/t, and the amount that iron scale is added after iron making is 6.65kg/t.
Further, iron scale is added after iron making, should be in two batches added before rifle blowing 1.5min under oxygen rifle.
Further, the control of steel-making temperature is conducive to the mobility for improving slag iron, increases dynamics item at 1550 DEG C or more
Part enhances dephosphorization effect.
In technical solution provided by the present invention, in oxygen rifle converting process, the silica metaplasia in molten iron is at SiO2；Before
Phase basicity controls in 1.5~1.7 ranges, is conducive to generate 3CaO2SiO2, fusing point of this slag in phasor 1400~
1450 DEG C, and good fluidity, also there is dephosphorizing capacity, and be easy to be discharged because of good fluidity when slagging；Later stage basicity control
System is conducive to generate 2FeOSiO2 2.5~2.8, and fusing point is conducive to improve mobility, increases dynamics at 1500 DEG C or so
Condition is also beneficial to dephosphorization.The raising of FeO contents can promote dissolving of the calcium oxide in slag, but excessively high FeO can cause iron loss
Mistake rate height and splash, it is therefore desirable to control the content of FeO in 20%~25% range, while early period, dephosphorization rate was best.Gently
Refractory material in protection stove is played the role of in the addition of calcined dolomite, and the MgO of pyrolytic is left in slag, also functions to reduction
Viscosity improves the effect of slag mobility.
After the completion of dephosphorization method of the present invention, low-phosphorous sulphur can be realized using conventional smelting process in remaining process
The production of H08A steel series.
Component content according to the present invention is mass content.
Technical solution according to the present invention can reach the standard of ultralow phosphorus, at the same in smelting process lime consumption can
It controls in range, there is blow loss to reduce, steel technology reduces, converter terminal first-hit yield improves, being capable of extending furnace lining life
Etc. good results.
Specific implementation mode
With reference to embodiment, invention is further explained.
Certain steel mill carries out the smelting of H08A steel series using technical solution of the present invention, and Metal Weight is in ladle
The composition design of 150t, H08A steel series such as following table：
| Element | C | Si | Mn | P | S |
| Standard | ≤0.080 | ≤0.03 | 0.35~0.60 | ≤0.005 | ≤0.005 |
| It lets pass | ≤0.075 | ≤0.03 | 0.40~0.60 | ≤0.0045 | ≤0.0045 |
| Internal control | ≤0.070 | ≤0.02 | 0.45~0.55 | ≤0.004 | ≤0.004 |
| Target | 0.065 | ≤0.02 | 0.50 | ≤0.003 | ≤0.003 |
Embodiment 1
Processing step is as follows：
(1) iron making feeds：Lime 2t is added before iron making, iron scale 3t, which is added, with steel scrap carries out bedding and padding；Iron making terminates
When starting blowing, 1.5t iron scales are added, under oxygen rifle before rifle blowing 1.5min, adds in two batches, it is light that partial supplementary material is added
Calcined dolomite,
(2) slag making dephosphorization：Make steel temperature control at 1580 DEG C, in oxygen rifle converting process, by be added lime, early period alkali
Degree control is 1.5, and rifle position should control 30 seconds before 2.5m, deslagging and reduce rifle position to 1.8m early period；
Blow oxygen amount 3200Nm3, when playing slag in stove, and has excessive slag sign to occur, while coal gas detection CO concentration reaches
46m3When/min, rifle deslagging is proposed, pre-slag pours out 2/5；
After early period is finished down slag, second of slag making is carried out, adds lime, the control of later stage basicity raises oxygen lance position 2.5,
Promote to generate FeO, the content that the content of FeO be 20%, MgO in finishing slag be 9%, and P content is 0.0028% in molten steel, and satisfaction is given birth to
Production demand.
Embodiment 2
Processing step is as follows：
(1) iron making feeds：Lime 2t is added before iron making, iron scale 3t, which is added, with steel scrap carries out bedding and padding；Iron making terminates
When starting blowing, 1.5t iron scales are added, under oxygen rifle before rifle blowing 1.5min, adds in two batches, it is light that partial supplementary material is added
Calcined dolomite,
(2) slag making dephosphorization：Make steel temperature control at 1600 DEG C, in oxygen rifle converting process, by be added lime, early period alkali
Degree control is 1.7, and rifle position should control 30 seconds before 3.0m, deslagging and reduce rifle position to 2.0m early period；
Blow oxygen amount 2800Nm3, when playing slag in stove, and has excessive slag sign to occur, while coal gas detection CO concentration reaches
50m3When/min, rifle deslagging is proposed, pre-slag pours out 3/5；
After early period is finished down slag, second of slag making is carried out, adds lime, the control of later stage basicity raises oxygen lance position 2.8,
Promote to generate FeO, the content that the content of FeO be 25%, MgO in finishing slag be 11%, and P content is 0.0025% in molten steel, satisfaction
Production requirement.
Above-described specific implementation mode, has been further described technical scheme of the present invention, should manage
Solution, the foregoing is merely the specific implementation modes of the present invention, are not intended to restrict the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should all be included in the protection scope of the present invention god.
Claims (6)
1. a kind of H08A steel series dephosphorization production technology, it is characterised in that：It includes the following steps：
(1) iron making feeds：Lime is added before iron making, iron scale is added with steel scrap or sinter return fine carries out bedding and padding；Iron making knot
When beam starts blowing, iron scale and partial supplementary material light dolomite is added；
(2) slag making dephosphorization：In oxygen rifle converting process, lime is added, basicity control early period is in 1.5~1.7 ranges, later stage alkali
Degree control rationally controls rifle position, and double slag operation is combined to carry out dephosphorization in 2.5~2.8 ranges.
2. a kind of H08A steel series dephosphorization production technology according to claim 1, it is characterised in that：Double slags
Operation specifically includes：
Blow 2400~3200Nm3 of oxygen amount, when playing slag in stove, and has excessive slag sign to occur, while coal gas detection CO concentration reaches
To 40~50m3When/min, rifle deslagging is proposed, pre-slag pours out 2/5~3/5；
After early period is finished down slag, second of slag making is carried out, raises oxygen lance position, promotes to generate FeO, ensures the content of FeO in finishing slag
In 20%~25% range, the content of MgO could form low melting point in 9~12% ranges, be easy to the slag system of dephosphorization.
3. a kind of H08A steel series dephosphorization production technology according to claim 2, it is characterised in that：It was blowing
Cheng Zhong, rifle position should control before 2.5~3.0m, deslagging and reduce within 30 seconds rifle position to 2.0~1.8m early period.
4. a kind of H08A steel series dephosphorization production technology according to claim 1, it is characterised in that：Before iron making
Lime addition is 13.3kg/t, and the amount of iron scale or sinter return fine is 20kg/t, and the amount that iron scale is added after iron making is
6.65kg/t。
5. a kind of H08A steel series dephosphorization production technology according to claim 1, it is characterised in that：Add after iron making
Enter iron scale, should in two batches be added before rifle blowing 1.5min under oxygen rifle.
6. according to Claims 1 to 5 its any one of described in a kind of H08A steel series dephosphorization production technology, feature exists
In：Temperature control is made steel at 1550 DEG C or more.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810512795.2A CN108754063B (en) | 2018-05-25 | 2018-05-25 | Dephosphorization production process for H08A series steel |
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| CN201810512795.2A CN108754063B (en) | 2018-05-25 | 2018-05-25 | Dephosphorization production process for H08A series steel |
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| CN108754063A true CN108754063A (en) | 2018-11-06 |
| CN108754063B CN108754063B (en) | 2020-08-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112501488A (en) * | 2020-10-22 | 2021-03-16 | 福建三宝钢铁有限公司 | Preparation process of H08A steel |
| CN114150100A (en) * | 2021-10-15 | 2022-03-08 | 邯郸钢铁集团设计院有限公司 | Steelmaking method for smelting high-carbon low-phosphorus steel by converter |
| CN115874007A (en) * | 2022-11-30 | 2023-03-31 | 阳春新钢铁有限责任公司 | Method for reducing double-slag iron loss of converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112501488A (en) * | 2020-10-22 | 2021-03-16 | 福建三宝钢铁有限公司 | Preparation process of H08A steel |
| CN114150100A (en) * | 2021-10-15 | 2022-03-08 | 邯郸钢铁集团设计院有限公司 | Steelmaking method for smelting high-carbon low-phosphorus steel by converter |
| CN115874007A (en) * | 2022-11-30 | 2023-03-31 | 阳春新钢铁有限责任公司 | Method for reducing double-slag iron loss of converter |
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