CN106498115A - A kind of method of chrome-bearing alloy steel converter tapping control Ti contents - Google Patents
A kind of method of chrome-bearing alloy steel converter tapping control Ti contents Download PDFInfo
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- CN106498115A CN106498115A CN201710019706.6A CN201710019706A CN106498115A CN 106498115 A CN106498115 A CN 106498115A CN 201710019706 A CN201710019706 A CN 201710019706A CN 106498115 A CN106498115 A CN 106498115A
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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
- C21C5/34—Blowing through the bath
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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
- C21C5/36—Processes yielding slags of special composition
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention proposes a kind of technique of chrome-bearing alloy steel converter tapping control Ti contents, and converter stays slag method to make steel using single slag.In the process of bessemerizing using the special loading system for being quantitatively adding the raw materials such as chrome ore, Calx in batches, and adopt N2Turn the bottom blowing pattern of Ar.This technique improves the Cr contents of converter molten steel terminal, and contrast reduces tapping process and adds ferrochrome 800kg 1200kg, reduces steel making working procedure cost.25 DEG C 30 DEG C or so of the temperature drop of tapping process alloying generation is reduced, LF stoves electric power feeding time 8 12 minutes or so is reduced, the LF operation energy is saved.Avoid plus ferrochrome process Ti element enters molten steel, effectively reduce the Ti contents of molten steel, reduce in steel because the high TiN for being formed of Ti contents and (TiCN) nitrogenize titanium inclusion, improve the quality of chrome-bearing alloy steel.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, more particularly to a kind of chrome-bearing alloy steel converter tapping control Ti contents
Method.
Background technology
In recent years due to the huge advance of process for making, in the production of chrome-bearing alloy steel, oxidation type impurity is basic obtains
To control, the control of nitride inclusion thing during production chrome-bearing alloy steel is increasingly taken seriously, and TiN and (TiCN) are
Main nitridation type impurity, it is the Main Means for controlling nitride to control Ti contents in molten steel.
Titanium nitride is a kind of hard and crisp field trash, and it can reduce the fatigue life of steel, in the field trash of same levels
In, the harm of nitride is greater than oxide.There is a certain amount of Ti elements in the alloy added in converter tapping process, especially
Which is ferrochrome, and its Ti content is higher.Cr containing more than 1.0% in chrome-bearing alloy steel, needs tapping for reaching Cr contents
Journey adds the ferrochrome of more than 2.5t, and the impurity Ti contained in ferrochrome is entered in molten steel therewith.Chrome-bearing alloy steel exists
Converter is very low using the oxygen content of molten steel in aluminium deoxidation alloying process, and the Ti entered in molten steel is difficult to be removed.Blow in converter
Refining process carries out the interpolation of chrome ore, using the oxygen content of converting process middle and high concentration, aoxidizes the Ti that chrome ore is fused in molten steel, can
Effectively to remove the Ti in chrome-bearing alloy steel, however lack at present a kind of be capable of the bessemerizing of effective control Ti content during
Add the process of evanohm.
The Ti contents that brings in molten steel because of the addition of alloy in tapping process are effectively reduced, is formulated out herein and is controlled
The Ti contents of molten steel processed, through determining, molten steel composition Ti contents about 0.0020% or so are than using now with technique steel
Water Ti contents reduce by more than 50%.
Content of the invention
The present invention is directed to above-mentioned technical problem, and practice of the blue or green steel of foundation in converter producing chrome-bearing alloy steel, by theory
Analysis and produced on-site combine, a kind of method for adding evanohm during proposing bessemerizing, being capable of effective control molten steel
In Ti contents, after measured, converter terminal Ti contents about 0.0010% are suitable with existing process, without because of converting process addition
Chrome ore affects the Ti contents of converter molten steel terminal.Molten steel composition Ti contents are less than 0.0020%, because alloying adds chromium less
Ferroalloy molten steel composition Ti substantially reduces.
In order to achieve the above object, the technical solution used in the present invention is：
A kind of method of chrome-bearing alloy steel converter tapping control Ti contents, stays slag method to smelt using single slag, in converting process
Slag charge, blowing beginning 1-2 minutes is added to concentrate addition Calx 2000kg-3000kg, chrome ore 1000kg- according to following system
1500kg, limestone 800kg-1200kg added 200kg-500kg coolants, blow as first slag material, blowing 3-4 minutes
Refining 5-9 minutes added quantitative chrome ore, fluorite and Calx every 1 minute.
Preferably, bottom blown gas pressure is 0.8Mpa-1.4Mpa, molten iron and blowing are being employed nitrogen as first 7 minutes
Based on stir source of the gas, blowing start 7 minutes after switch to argon stir.
Preferably, the air supply intensity scope of bottom blown gas nitrogen, argon is respectively nitrogen 0.025-0.30Nm3/t
Min, argon 0.025-0.30Nm3/t min.
Preferably, the coolant is sintering deposit.
Preferably, converting process adopts following oxygen supply system, O2When concentration is less than 6%, increase every 20 seconds stageds
Oxygen supply by lance amount, increases 2000m every time3/ h, increases by 3 times altogether, and last oxygen flow is stable in 20000m3/ h, pressure 0.9Mpa.
Preferably, according to aluminium ingot (addition 80kg-120kg) → ferrochrome (according to terminal Cr in tapping process
Content determines) → carburant (500kg-800kg) → high purity ferrosilicon (200kg-350kg) → mid-carbon fe-mn (250kg-350kg)
Addition and order add alloy.
Preferably, the chrome ore its chemical composition by weight percentage is：Cr2O3>=40%, Cr2O3/ FeO >=2.5, P
≤ 0.07%, S≤0.05%, SiO2≤ 6.0%.
Preferably, chrome ore granularity is 0.5-60mm.
Compared with prior art, advantages of the present invention and good effect are：
1st, converter stays slag method to make steel using single slag, improves the response rate of Cr elements, Cr using saturation Cr in previous slag
The response rate can reach more than 45%.
2nd, this technique improves the Cr contents of converter molten steel terminal, and contrast reduces tapping process and adds ferrochrome 800kg-
1200kg, reduces steel making working procedure cost.
3rd, 25 DEG C -30 DEG C or so of the temperature drop of tapping process alloying generation is reduced, LF stove electric power feeding times 8-12 point is reduced
Clock or so, saves the LF operation energy.
4th, production chrome-bearing alloy steel reduces tapping process ferrochrome using the Cr bessemerized in process reducing chrome ore
Addition, it is to avoid plus ferrochrome process Ti element enter molten steel, effectively reduce the Ti contents of molten steel, reduce in steel
Because the high TiN for being formed of Ti contents and (TiCN) nitrogenize titanium inclusion, the quality of chrome-bearing alloy steel is improve.
Specific embodiment
In order to be better understood from the present invention, illustrate with reference to embodiment.
Embodiment 1：
As a example by smelting SUJ2 type chrome-bearing alloy steel, carry out according to following processing step.The chemistry of the chrome-bearing alloy steel into
Divide and be by weight percentage：C：0.96, Si：0.021, Mn：0.35, P：0.011, S：0.001, Al：0.027, Ca：0.0004,
Cr：1.46, Ti：0.0019, balance of ferrum.
1) molten iron pretreatment, after pretreatment, molten iron situation is as follows：
| C, % | Si, % | Mn, % | P, % | S, % | Ti, % | T,℃ | Weight, t |
| 4.07 | 0.59 | 0.29 | 0.119 | 0.001 | 0.060 | 1326 | 100 |
The de- S pressure of converter steelmaking process is mitigated using the molten iron of pretreatment.
2) converter stays slag method to smelt using single slag, improves the response rate of Cr elements, Cr using saturation Cr in previous slag
The response rate can reach more than 45%.1 point of blowing is concentrated and adds slag material 3t Calx, limestone 1t, chrome ore 1.2t for 30 seconds.Add
2 high hoppers of Shi Caiyong load, and are conducive to chrome ore to concentrate and can mix with slag materials such as Calx when adding and adding, early stage
Concentrate the recovery rate for adding chrome ore improve Cr elements.Enter chrome ore, fluorite, Calx etc. in batches after blowing 3 minutes, add stone altogether
Grey 4.2t chrome ores 4.1t, fluorite 250kg, concrete addition time and batch such as following table.
Wherein, chrome ore 1, chrome ore 2 are same raw material for the chrome ore of two different feed bins.Chrome ore technical specification is chemical composition
Cr2O3：42%th, Cr2O3/FeO：2.0、P：0.05%th, S：0.0:3%th, SiO2：6.0%, granularity is 0.5mm-60mm.
3) blow experienced process bottom blowing pattern is adopted for F patterns, table specific as follows.
4) converter terminal tapping Composition Control：C:0.13%, P:0.009%, S:0.004%, Cr:0.506%, tapping temperature
Degree:1650℃；Ferro-aluminum is added after 5 tons of tapping, adds ferrochrome 1818kg, low nitrogen carburant 658kg, high purity ferrosilicon during tapping 1/4
285kg, mid-carbon fe-mn 280kg, add during tapping 2/3, add 150Kg Calx dry slags after having gone out steel.1483 DEG C of LF stoves thermometric is arrived,
Than 25 DEG C -30 DEG C being improve now with technique to LF stove thermometric temperature save LF stoves electric power feeding time 10 minutes or so.
Molten steel is analyzed, in the molten steel sampled wherein after LF refining temperature raising slugging, Ti contents are 0.0011%, and
Match somebody with somebody chromium pattern Ti content 0.0019%-0.0030% using whole furnace rear deoxidation alloyings, it is seen that Ti contents reduce in molten steel, and
The addition of converter alloying ferrochrome is significantly reduced.Molten steel composition Ti contents are 0.0019%, and prior art production
In SUJ2 steel, Ti contents are 0.0035%-0.0049%, it is seen that Ti contents reduce 50% or so.
Embodiment 2：
Chrome-bearing alloy steel steel SUJ2, the chemical composition of the chrome-bearing alloy steel is by weight percentage：C：0.98, Si：
0.023, Mn：0.34, P：0.009, S：0.001, Al：0.028, Ca：0.0005, Cr：1.45, Ti：0.0017, balance of ferrum.
1) after molten iron pretreatment, molten iron situation.
| C, % | Si, % | Mn, % | P, % | S, % | Ti, % | T,℃ | Weight, t |
| 4.58 | 0.56 | 0.27 | 0.118 | 0.001 | 0.064 | 1309 | 100 |
The de- S pressure of converter steelmaking process is mitigated using the molten iron of pretreatment.
2) converter stays slag method to smelt using single slag, blows and practices 1 point of 30 seconds concentration addition slag material 3.1t Calx, chrome ore 1.35t,
Early stage concentrates the recovery rate for adding chrome ore improve Cr elements.Enter chrome ore, fluorite, Calx etc. in batches after blowing 3 minutes, add altogether
Enter Calx 4.35t, chrome ore 4.5t, fluorite 260kg, concrete addition time and batch such as following table.
It is same raw material that chrome ore 1, chrome ore 2 are the chrome ore of two different feed bins.Chemical composition Cr2O3：42%th, Cr2O3/FeO：
2.0、P：0.05%th, S：0.0:3%th, SiO2：6.0%, granularity is 0.5mm-60mm.
3) blowing experienced process adopts bottom blowing pattern for F patterns, and details see the table below.
4) converter terminal tapping Composition Control：C:0.13%P:0.007%, S:0.002%, Cr:0.55, Ti：
0.0006%, tapping temperature:1647℃；Ferro-aluminum is added after 5 tons of tapping, adds ferrochrome 1730kg, low nitrogen carburant during tapping 1/4
658kg, high purity ferrosilicon 281kg, mid-carbon fe-mn 277kg, add during tapping 2/3, add 150Kg Calx dry slags after having gone out steel.Arrive
1477 DEG C of LF stoves thermometric, saves LF stoves electric power feeding time 8 minutes than improve 25 DEG C or so now with technique to LF stove thermometric temperature
Left and right.
It is 0.0012% to sample molten steel Ti contents after entering LF refining body temperature slugging, hence it is evident that less than the whole furnace rear deoxygenations of employing
Aurification matches somebody with somebody chromium pattern Ti content 0.0019%-0.0030%.The addition of converter alloying ferrochrome is reduced, molten steel Ti contents reduce
Substantially.
Molten steel is analyzed, wherein molten steel composition Ti contents are 0.0017%.SUJ2 than prior art production
Ti contents 0.0035%-0.0049% in steel, Ti contents reduce more than 50%.
Embodiment 3：
Chrome-bearing alloy steel steel SUJ2, the chemical composition of the chrome-bearing alloy steel is by weight percentage：C：0.99, Si：
0.021, Mn：0.36, P：0.009, S：0.001, Al：0.025, Ca：0.0005, Cr：1.46, Ti：0.0017, balance of ferrum.
1) after molten iron pretreatment, molten iron situation.
| C, % | Si, % | Mn, % | P, % | S, % | Ti, % | T,℃ | Weight, t |
| 4.70 | 0.53 | 0.30 | 0128 | 0.001 | 0.054 | 1388 | 100 |
The de- S pressure of converter steelmaking process is mitigated using the molten iron of pretreatment.
2) converter stays slag method to smelt using single slag, blows and practices 1 point of 30 seconds concentration addition slag material 3t Calx, 1.23t chrome ores,
(early stage concentrates the recovery rate for adding chrome ore improve Cr elements) enters chrome ore, fluorite, Calx etc. after blowing 3 minutes in batches, altogether
Add Calx 4.01t chrome ore 4.1t, fluorite 280kg.Concrete addition time and batch such as following table.
It is same raw material that chrome ore 1, chrome ore 2 are the chrome ore of two different feed bins.Chemical composition Cr2O3：42%th, Cr2O3/FeO：
2.0、P：0.05%th, S：0.0:3%th, SiO2：6.0%, granularity is 0.5mm-60mm.
3) blowing experienced process adopts bottom blowing pattern for F patterns, and details see the table below.
4) converter terminal tapping Composition Control：C:0.05%, P:0.006%, S:0.004%, Cr:0.51, Ti：
0.0006%, tapping temperature:1650℃；Ferro-aluminum is added after 5 tons of tapping, adds ferrochrome 1770kg, low nitrogen carburant during tapping 1/4
720kg, high purity ferrosilicon 277kg, mid-carbon fe-mn 281kg, add during tapping 2/3, add 150Kg Calx dry slags after having gone out steel.Arrive
1480 DEG C of LF stoves thermometric, than improve 28 DEG C or so saving LF stove power transmission temperature raising times 9 now with technique to LF stove thermometric temperature
Minute or so.
Molten steel is analyzed, it is 0.0011% to sample molten steel Ti contents after wherein entering LF refining body temperature slugging, hence it is evident that low
Converter alloying ferrochrome is reduced in using whole furnace rear deoxidation alloyings with chromium pattern Ti content 0.0019%-0.0030%
Addition, molten steel Ti contents reduce substantially.
Molten steel composition Ti contents are 0.0017%, than Ti contents 0.0035%- in the SUJ2 steel of prior art production
0.0049%, Ti content reduces more than 50%.
Method described in above example improves the Cr contents of converter molten steel terminal, and contrast reduces tapping process and adds
Ferrochrome 800kg-1200kg, reduces steel making working procedure cost.Reduce 25 DEG C of -30 DEG C of left sides of temperature drop of tapping process alloying generation
The right side, reduces or so LF stove electric power feeding time 8-12 minutes, saves the LF operation energy.Avoid plus ferrochrome process Ti element enters steel
Water, effectively reduces the Ti contents of molten steel, reduces in steel because the high TiN for being formed of Ti contents and (TiCN) titanium nitride are mingled with
Thing, improves the quality of chrome-bearing alloy steel.
The above, is only presently preferred embodiments of the present invention, is not the restriction for making other forms to the present invention, appoints
What those skilled in the art changed possibly also with the technology contents of the disclosure above or be modified as equivalent variations etc.
Effect embodiment is applied to other fields, but every without departing from technical solution of the present invention content, according to the technical spirit of the present invention
Any simple modification, equivalent variations and the remodeling made by above example, still falls within the protection domain of technical solution of the present invention.
Claims (8)
1. a kind of method that chrome-bearing alloy steel converter tapping controls Ti contents, it is characterised in that：Stay slag method to smelt using single slag, blow
Slag charge, blowing beginning 1-2 minutes is added to concentrate addition Calx 2000kg-3000kg, chrome ore according to following system during refining
1000kg-1500kg, limestone 800kg-1200kg add 200kg-500kg cold as first slag material, blowing 3-4 minutes
But agent, blowing 5-9 minutes added quantitative chrome ore, fluorite and Calx every 1 minute.
2. the method that chrome-bearing alloy steel converter tapping according to claim 1 controls Ti contents, it is characterised in that：Bottom Blowing
Body pressure be 0.8Mpa-1.4Mpa, to molten iron and blowing employ nitrogen as within first 7 minutes based on stir source of the gas, blowing start 7
Argon is switched to stir after minute.
3. the method that chrome-bearing alloy steel converter tapping according to claim 2 controls Ti contents, it is characterised in that：Bottom Blowing
Body nitrogen, the air supply intensity scope of argon are respectively nitrogen 0.025-0.30Nm3/ tmin, argon 0.025-0.30Nm3/t min.
4. the method that chrome-bearing alloy steel converter tapping according to claim 1 controls Ti contents, it is characterised in that：Described cold
But agent is sintering deposit.
5. the method that chrome-bearing alloy steel converter tapping according to claim 1 controls Ti contents, it is characterised in that：Blew
Below Cheng Caiyong oxygen supply systems, O2When concentration is less than 6%, increases oxygen supply by lance amount every 20 seconds stageds, increase every time
2000m3/ h, increases by 3 times altogether, and last oxygen flow is stable in 20000m3/ h, pressure 0.9Mpa.
6. the method that chrome-bearing alloy steel converter tapping according to claim 1 controls Ti contents, it is characterised in that：In tapping
During according to aluminium ingot (addition 80kg-120kg) → ferrochrome (according to terminal Cr contents determine) → carburant (500kg-
The addition of 800kg) → high purity ferrosilicon (200kg-350kg) → mid-carbon fe-mn (250kg-350kg) and order add alloy.
7. the method that chrome-bearing alloy steel converter tapping according to claim 3 controls Ti contents, it is characterised in that：The chromium
Ore deposit its chemical composition by weight percentage is：Cr2O3>=40%, Cr2O3/ FeO >=2.5, P≤0.07%, S≤0.05%, SiO2
≤ 6.0%.
8. the method that chrome-bearing alloy steel converter tapping according to claim 6 controls Ti contents, it is characterised in that：Chrome ore grain
Spend for 0.5-60mm.
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| JPS54158320A (en) * | 1978-06-03 | 1979-12-14 | Nippon Steel Corp | Refining method for high chromium steel |
| CN103540705A (en) * | 2013-10-30 | 2014-01-29 | 承德建龙特殊钢有限公司 | Method for adding metal chromium in converter steelmaking process |
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| CN104212935A (en) * | 2014-08-22 | 2014-12-17 | 山东西王特钢有限公司 | Method for producing high-grade GCr15 bearing steel by using high-titanium chrome iron |
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