CN110387448A - A kind of method that converter rapid low consumption produces low-phosphorous special steel - Google Patents
A kind of method that converter rapid low consumption produces low-phosphorous special steel Download PDFInfo
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- CN110387448A CN110387448A CN201910763034.9A CN201910763034A CN110387448A CN 110387448 A CN110387448 A CN 110387448A CN 201910763034 A CN201910763034 A CN 201910763034A CN 110387448 A CN110387448 A CN 110387448A
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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
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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
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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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- Engineering & Computer Science (AREA)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention relates to a kind of methods that converter rapid low consumption produces low-phosphorous special steel, by the way that the remaining slag operation in converter double slag process is applied to single-slag practice mode, it further reduced the consumption of the slag charge of single-slag practice, steel technology and energy medium, at the same time, the exhaust gas waste sludge discharge amount of entire smelting process also further decreases therewith；Moreover, realizing the substantially shortening of specific low-phosphorous variety steel smelting cycle, production process controllability is remarkably reinforced based on single slag process operating process is brief, organization of production is easily specific；In addition, the operation is also to increase steel scrap ratio in raw material mix, enhancing smelting process provides the foundation for adaptability to raw materials；And the adjustment of smelting process slag charge auxiliary material structure is then more conducive to realize the reduction and the stabilization of the type of furnace of lining wear, creates positive advantageous condition for the even running of all steel grade production processes.
Description
Technical field
The present invention relates to a kind of methods that converter rapid low consumption produces low-phosphorous special steel, belong to metallurgical technology field.
Background technique
In the specific steel grade of converter smelting, how to realize that the economic validity of dephosphorization is always just especially prominent in converter smelting
A typical problem out；And on the other hand, entire steel industry is being limited by resource, energy consumption and is being wanted to environment
In the case where asking higher and higher, as how minimum consumption realizes that the smelting of the low-phosphorous special steel of converter obviously has become industry concern
With an emphasis of research, also therefore, the innovation and breakthrough of special steel low-phosphorous for converter smelting are having both long-acting positive effect
While answering, more aobvious timeliness urgency.
The field has been carried out at present mature technology and the correlative study explored mainly include following several:
Duplex practice uses two block converter integrations of operation, a block converter dephosphorization, and another block converter receives from the low of dephosphorization furnace
Phosphorus molten steel decarburization, two block converter integrations of operation can realize the stable high dephosphorization rate of converter, but two block converter of process requirement is set
Standby to fulfil assignment, in addition for the technique other than requiring height to production equipment, organization of production is also the most complicated, and is short of economical
Property.
Double slag process realizes high efficiency dephosphorating by a smelting cycle slag making twice in same block converter, in addition remaining slag operation
The characteristics of, the consumption of whole slag charge can be further decreased, if not under by production cycle restrictive condition if can to give full play to its excellent
Gesture and feature.But the when it come to restriction of smelting cycle, especially with current overall compact concise, continuous casting period phase
Match, improve the efficiency of entire smelting process, then the converter smelting period will be put forward higher requirements, while is total from further decreasing
For the consumption angle of body unit source medium, shortening smelting cycle is also to realize the most direct measure of this target.
And single slag process is overall a kind of Low-phosphorus Steel converter smelting that the period is most short, equipment requirement is minimum in all smelting modes
Method.But it since traditional concept recognizes its dephosphorizing capacity shortcoming, the conventional of dephosphorization inefficiency, is not considered as usually low
The smelting process of phosphorus special steel, even if quantity of slag consumption, also usually occurs in the paid smelting for using single slag to carry out low-phosphorous special steel
It dramatically increases, the terminal rate of re-blowing is obviously improved, smelts the problems such as stability is poor.
Summary of the invention
In order to overcome drawbacks described above, invention provides a kind of method that converter rapid low consumption produces low-phosphorous special steel.The present invention
Remaining slag operation in converter double slag process is applied to single-slag practice mode, further reduced slag charge, the iron and steel stock of single-slag practice
Consumption and the consumption of energy medium, at the same time, the exhaust gas waste sludge discharge amount of entire smelting process also further decreases therewith；
Moreover, realizing specific low-phosphorous variety steel smelting cycle based on single slag process operating process is brief, organization of production is easily specific
Substantially shorten, production process controllability is remarkably reinforced；In addition, the operation is also to increase steel scrap ratio in raw material mix, enhance smelting
Smelting method provides the foundation for adaptability to raw materials；And the adjustment of smelting process slag charge auxiliary material structure is then more conducive to realize that furnace lining is invaded
The reduction of erosion and the stabilization of the type of furnace create positive advantageous condition for the even running of all steel grade production processes.
To achieve the above object, the technical scheme adopted by the invention is as follows: a kind of converter rapid low consumption produces low-phosphorous special type
The method of steel, using converter top bottom blowing, the weight percent of raw material composition are as follows: molten iron 60~75% cleans steel scrap 25
~40%, remaining is the pig iron；Specifically comprise the following steps:
Step 1, the clinker of a upper furnace all stays in finishing slag in the converter after splashing Slag treatment, then by the original
Material, which is added, to be prepared to smelt in furnace, 0.21 > (material quality dosage-converter tapping quantity) ÷ converter tapping quantity > 0.1.
Step 2, when smelting, bottom-blowing of converter is set, the stage of blowing is opened, (oxygen lance position refers in the present invention by oxygen lance position
Oxygen lance nozzle is to the distance between bath surface) down toward 1550~1650mm, adjustment oxygen rifle flow is 33000~38000m3/ h, under
The kindling of rifle point is opened blow 35s~70s after start plus lime and light dolomite, it is the converter tapping quantity that quality, which is added, in the lime
19~29 ‰, 6.5~10 ‰ that quality is the converter tapping quantity are added in the light dolomite, by oxygen rifle after all adding
100~250mm is moved up, oxygen rifle flow is adjusted to 26000~30000m3/ h, and added according to slugging situation in furnace and furnace temperature situation
Enter ore and carry out slugging and cooling, and quality≤tap 10 ‰ is added in the ore.In this step by by rifle position gradually
Move up 100-250mm, oxygen rifle flow is gradually adjusted to 26000~30000m3(charging refers to the tune of raw material mix for/h and charging
Whole, for example increase scrap ratio, ore has certain complementary effect) etc. modes extend low-temperature zone time of initial smelting period,
The low-temperature zone temperature is that can be further configured to 1350~1420 DEG C lower than 1420 DEG C；The speed and stream that the oxygen rifle moves up
The speed of amount adjustment is both needed to meet the reaction stability in the converter.
Step 3, after flue gas during smelting oxygen content is begun to decline, lime is added portionwise by 200kg~500kg/ batches, by 150
Ore batch is added portionwise in~250kg/, carries out temperature adjustment and slugging, and with the FeO content that keeps in slag, (mass content of FeO is generally tieed up
Hold in 14%-17%), single total additional amount of heat ore is no more than the 20 ‰ of the converter tapping quantity；After the completion of charging, by oxygen rifle
Rifle position is increased to 2100~2300mm, open blow into row to 10min~12min30s when, oxygen lance position is down to 1700~
Then 1900mm presses rifle 30s or more (continuing oxygen blast 30s or more in the rifle position)；Row is blown into 10min30s~13min opening
When mention rifle, i.e., oxygen rifle is raised up to the original position in non-converter, then furnace out of converter, pours out part clinker (as preferably falling
Clinker out accounts for 35~60% of total clinker quality in converter), thermometric sampling is carried out while pouring out clinker, confirmation meets terminal
In molten steel: the requirement of mass content >=0.10%, mass content≤0.008% of phosphorus (P) of carbon (C), the then tapping of falling furnace, eventually
Point liquid steel temperature is at 1585~1615 DEG C.In order to effectively avoid converter tapping slag, rephosphorization is prevented, and prevent slag from leading to molten steel
The increase of oxidisability, preferably, tapping is slag retaining cone and slide plate pushing off the slag using double gears.
Step 4, slag is splashed, clinkers whole in converter are stayed in converter to the smelting for being used for next heat after splashing slag.
Further, bottom-blowing of converter described in step 2 is nitrogen argon suitching type, and it is 0.08m that flow, which is arranged, in bottom blowing3/
Min.t, it may be assumed that molten steel bottom blowing 0.08m per minute per ton in converter3Gas, bottom blown gas open blow into row to 8min~
According to when furnace blowing situation, (the reaction between carbon and oxygen intensity i.e. in furnace, especially smelting process CO gas are generated during 10min30s
Amount usually occurs carrying out the switching of nitrogen argon before CO gas maximum value in furnace to determine the ability for taking bottom blown gas out of) it will
Nitrogen is switched to argon gas, and the argon bottom-blowing big flow end that 30s~50s is carried out before converter smelting terminates is stirred, and bottom blowing flow is set
It is set to 0.15m3/min.t。
The switching of nitrogen argon can be switching at runtime, utmostly save argon gas under the premise of not influencing terminal nitrogen content,
Reduce the cost of bottom blown gas, can also whole Argon, but cost is higher.
Preferably, oxygen lance position is 1700mm~1900mm when splashing slag described in step 4, splashing the slag time is
Light dolomite is added before splashing slag and carries out the control of terminal residue adjustment solid slag if clinker is partially dilute by 1min30s~3min.
Preferably, main component is C:4.23-5.12wt%, Si0.21- to molten iron described in raw material than iron
0.92wt%, P:0.83-0.135%, molten iron temperature are 1354-1453 DEG C.
The present invention has following good effect compared to existing Low-phosphorus Steel converter smelting common process:
(1) present invention effectively realizes the smelting of converter high cleaning scrap ratio, and the promotion of scrap ratio not only contributes to reduce
The dephosphorization load of converter smelting entirety, and it is conducive to extend smelting process especially low temperature early period effective dephosphorization phase, turn simultaneously
The overall iron and steel stock recovery rate raising that furnace smelts low-phosphorous special steel is rather significant, compared with common process ton steel steel technology decline 25
~50kg；
(2) it is then smelting process under the conditions of guaranteeing high scrap ratio that terminal, which stays cycling and reutilization of the slag under single-slag practice mode,
Rapid slagging slugging improves initial smelting period slag fluidity and Primary period using low rifle position, big oxygen flow and strengthens dephosphorization
Distinctive advantage is created, the heat consumption under slag charge consumption and high scrap ratio is also reduced, wherein slag charge consumption is more normal
Advise technique decline 35%~50%；
(3) present invention uses converter list slag remaining slag operation mode, while realizing that low-phosphorous extraordinary steel converter low consumption is smelted,
Advantage in organization of production and smelting cycle is even more obvious, and more conventional smelting process list heat smelting cycle shortens the time up to 5
~10min；
(4) according to each heat molten iron condition, stay the quantity of slag to carry out dynamic flexible adjustment for raw material mix, it is raw to realize converter
Produce greatly promoting for adaptability to raw materials during low-phosphorous special steel；
(5) compared with Low-phosphorus Steel converter producing common process, the entire smelting process of this method greatly reduce cold burden and
The additional amount of raw material (raw material refer mainly to lime stone and unprocessed dolomite) on the one hand reduces erosion of these auxiliary materials for furnace lining,
On the other hand also avoid substantially rising the generation of furnace bottom, further strengthens in the type of furnace controllability for smelting low-phosphorous special steel process；
(6) terminal tapping condition can meet C >=0.10%, the low-phosphorous special steel converter terminal control of P≤0.008% simultaneously
Condition processed.
Specific embodiment
The present invention is not limited to following detailed description, and persons skilled in the art are disclosed interior according to the present invention
Hold, can be implemented using other a variety of specific embodiments of the invention or all using design structure and think of of the invention
Road does simple change or change, both falls within protection scope of the present invention.It should be noted that in the absence of conflict, this
The feature in embodiment and embodiment in invention can be combined with each other.
The present invention is described in further detail below with reference to embodiment:
Embodiment 1:
The method that a kind of converter rapid low consumption provided in this embodiment produces low-phosphorous special steel, using 120t converter (tapping
Measure 120t) top bottom blowing, the weight percent of raw material the composition are as follows: (main component in molten iron in addition to iron of molten iron 64%
For C:4.79wt%, Si:0.85wt%, P:0.106wt%, molten iron temperature: 1406 DEG C), the cleaning steel scrap that surplus is 36% is former
Material total amount is 129.6t.
Step 1, finishing slag is all stayed in converter after splashing Slag treatment, stays slag, slag after tapping entirely by the clinker of a upper furnace
4.2t is measured, then above-mentioned raw materials are added and prepare to smelt in converter.
Step 2, when smelting, bottom-blowing of converter is set, bottom-blowing of converter flow set is 0.08m3/ min.t, bottom blown gas exist
Bottom blowing nitrogen is switched to argon bottom-blowing when oxygen blast 9min20s.The stage of blowing is opened using the converting process of low rifle position, big flow, rifle
Position control is opened in 1600mm blows, and oxygen rifle flow is adjusted to 36500m3/h.The kindling of lower rifle point is opened blow 58s after start plus lime and light
Calcined dolomite, for lime adding amount in 2100kg/ furnace, light dolomite adds 1000kg/ furnace.After one batch of material all adds, rifle position by
Gradually hang oneself 150mm, and flow is adjusted to 28000m3/ h (is guaranteeing to stablize reaction in converter, is preventing in furnace instead that dry, splash etc. be not no
It is good happen under the premise of oxygen rifle gradually moved up into 150mm, flow is gradually adjusted to 28000m3/ h), it opens and blows into row extremely
1min20s starts, and ore batch is added portionwise by 200~350kg/, carries out temperature adjustment and slugging, early period the total additional amount of ore
1000kg。
Step 3, after flue gas during smelting oxygen content is begun to decline, by 200kg~500kg lime/batch slag charge is added portionwise, and
Ore is added portionwise by 150~250kg/ batches, to keep FeO content certain in slag to maintain 14%-17%, the heat ore
Total additional amount is 2.12t；After the completion of charging, oxygen lance position is increased to 2200mm；Open blow into row to 10min45s when, the bottom of by
Wind drift amount is adjusted to 0.15m3/ min.t forces down rifle position to 1750mm, presses rifle time 35s；It is mentioned opening to blow into go to 11min20s
Rifle, then furnace, progress thermometric sampling simultaneously pour out part clinker, and the part clinker poured out herein accounts for total clinker quality in converter
45%, 1602 DEG C of liquid steel temperature at this time, C:0.13%, P:0.007% in molten steel；Confirm and falls furnace after temperature and molten steel composition immediately
Tapping, tapping is using double gears；Furnace discovery clinker in sampling is partially dilute, and 300kg light dolomite is added immediately during waiting samples
Carry out terminal solid slag.
Step 4, it carries out splashing slag using low rifle position 1400mm after tapping, splashing the slag time is 2min15s；After the furnace splashes slag
Whole clinker 5.2t in furnace is stayed in furnace to the smelting for being used for next heat.
The furnace Expenditure Levels are as follows: 23.2kg/ tons of steel of lime, slag charge wastage in bulk or weight are 31.9kg/ tons of steel, steel technology
1.109t/ tons of steel, smelting cycle 33.5min.
The group by this production technology produce one group of 10 low-phosphorous special steel of furnace, produce before laser thickness gauge survey furnace bottom with a thickness of
724mm, molten bath slag lining tap face thickness be 721mm, the group produce after, laser thickness gauge survey furnace bottom with a thickness of
737mm, molten bath slag lining tap face thickness as 712mm, and it is fixed that furnace bottom height dimension keeps steady, and furnace body corrodes smaller.
Comparative example 1:
Using 120t converter top bottom blowing, the weight percent of raw material composition is that (molten iron is in addition to iron for molten iron 75%
Main component be C:4.74%, Si:0.76%, P:0.99%, molten iron temperature: 1392 DEG C), the cleaning that surplus is 25% is useless
Steel, raw material total amount are 141.2t, do not stay slag after upper furnace tapping.
When smelting, bottom-blowing of converter flow set is 0.05m3/ min.t, bottom blown gas carry out nitrogen in oxygen blast 7min30s
The switching of gas and argon gas.The stage of blowing is opened using conventional rifle position, the converting process of normal discharge, rifle position control is opened in 1800mm blows,
Oxygen rifle flow is adjusted to 30500m3/h.1min20s starts to add lime and light dolomite, lime adding amount after lower rifle point kindling
3500kg/ furnace (30kg is added in ton steel 30kg, i.e., tap per ton, similarly hereinafter), light dolomite adds 1600kg/ furnace (ton steel
13kg).After one batch of material all adds, rifle position is gradually hung oneself 150mm, and flow is adjusted to 26000m3/h.1min20s starts by 200
Ore and unprocessed dolomite batch is added portionwise in~350kg/, carries out slugging and temperature adjustment, early period total additional amount 3200kg (the ton steel of ore
26.5kg), unprocessed dolomite additional amount is 1200kg (ton steel 10kg).After flue gas during smelting oxygen content is begun to decline by 200kg~
500kg lime/slag charge batch is added portionwise, and ore is added portionwise by 200~450kg/ batches, to keep FeO certain in slag to contain
Amount, the total additional amount of heat ore are 6.24t (ton steel 32kg)；After the completion of charging, oxygen lance position is increased to 2200mm；In
Oxygen-supplying amount is reduced to lower limit 23000m when 13min30s3/h；In 15min55s, rifle position is forced down to 1750mm, when pressing rifle
Between 20s；Rifle is mentioned in 16min15s, then furnace, progress thermometric sampling simultaneously pour out part clinker, at this time 1621 DEG C of liquid steel temperature,
Molten steel C:0.12%, P:0.014% descend rifle a little blow again immediately to ensure the P content < 0.010 that taps, and point blows time-consuming
1min20s, point blowing beam propose thermometric sampling again after rifle, at this time 1632 DEG C of liquid steel temperature, molten steel C:0.09%, P:0.009%,
The tapping of falling furnace immediately after confirmation temperature and molten steel composition, tapping use slag retaining cone pushing off the slag.
It carries out splashing slag using low rifle position 1750mm after tapping, splashing the slag time is 3min37s；The furnace will be in furnace after splashing slag
Slag all pours cinder ladle into.
The furnace Expenditure Levels are as follows: 38.6kg/ tons of steel of lime, slag charge wastage in bulk or weight are 57.3kg/ tons of steel, steel technology
1.158t/ tons of steel, smelting cycle 42.2min.
The group by this production technology produce one group of 9 low-phosphorous special steel of furnace, produce before laser thickness gauge survey furnace bottom with a thickness of
711mm, molten bath slag lining tap face thickness be 726mm, the group produce after, laser thickness gauge survey furnace bottom with a thickness of
785mm, molten bath slag lining tap face thickness as 677mm, and the furnace bottom that rises is obvious, and furnace body erosion is also more serious.
Embodiment 2:
Using 120t converter top bottom blowing, the weight percent of raw material composition is that (molten iron is in addition to iron for molten iron 70%
Main component be C:4.64%, Si:0.45%, P:0.121%, molten iron temperature: 1352 DEG C), the cleaning that surplus is 27% is useless
Steel and 3% the pig iron, raw material total amount be 131.7t.
Step 1, finishing slag is all stayed in converter after splashing Slag treatment, stays slag, slag after tapping entirely by the clinker of a upper furnace
5.6t is measured, then above-mentioned raw materials are added and prepare to smelt in converter.
Step 2, when smelting, bottom-blowing of converter flow set is 0.08m3/ min.t, bottom blown gas is in oxygen blast 10min05s
The switching of Shi Jinhang nitrogen and argon gas.The stage of blowing is opened using the converting process of low rifle position, big flow, rifle position control is opened in 1700mm
It blows, oxygen rifle flow is adjusted to 35000m3/h.1min05s starts after lower rifle point kindling plus lime and light dolomite, lime are added
For amount at 2450kg/ furnace (ton steel 20.5kg), light dolomite adds 1100kg/ furnace (ton steel 9.2kg).After one batch of material all adds,
Rifle position is gradually hung oneself 150mm, and flow is adjusted to 27000m3/h.It opens to blow into go and starts to be added portionwise by 250kg/ batches to 1min35s
Ore carries out temperature adjustment and slugging, the total additional amount 1580kg of ore early period (ton steel 13.2kg).
Step 3, by 200kg~350kg lime/batch slag charge is added portionwise after flue gas during smelting oxygen content is begun to decline, and
Ore is added portionwise by 200~350kg/ batches, to keep FeO content (maintaining 14%-17%) certain in slag, the heat mine
The total additional amount of Shi is 2.42t (ton steel 20kg)；After the completion of charging, oxygen lance position is increased to 2150mm；It, will in 11min13s
Bottom blowing flow is adjusted to 0.15m3/ min.t forces down rifle position to 1800mm, presses rifle time 32s；Rifle is mentioned in 11min45s, is then fallen
Furnace carries out thermometric sampling and pours out part clinker, at this time 1613 DEG C of liquid steel temperature, molten steel C:0.12%, P:0.008%, confirmation
The tapping of falling furnace immediately after temperature and molten steel composition, tapping is using double gears.
Step 4, it carries out splashing slag using low rifle position 1400mm after tapping, splashing the slag time is 2min35s；After the furnace splashes slag
Whole clinkers (4.9t) stay in furnace the smelting for being used for next heat in furnace.
The furnace Expenditure Levels are as follows: 25.4kg/ tons of steel of lime, slag charge wastage in bulk or weight are 34.2kg/ tons of steel, steel technology
1.112t/ tons of steel, smelting cycle 34.7min.
The group by this production technology produce one group of 13 low-phosphorous special steel of furnace, produce before laser thickness gauge survey furnace bottom with a thickness of
742mm, molten bath slag lining tap face thickness be 734mm, the group produce after, laser thickness gauge survey furnace bottom with a thickness of
732mm, molten bath slag lining tap face thickness as 723mm, and the whole type of furnace working of a furnace is stablized.
Comparative example 2:
Using 120t converter top bottom blowing, the weight percent of raw material composition is that (molten iron is in addition to iron for molten iron 75%
Main component be C:4.92%, Si:0.47%, P:0.113%, molten iron temperature: 1367 DEG C), the cleaning that surplus is 15% is useless
Steel and 10% the pig iron, raw material total amount is 143.6t, does not stay slag after the tapping of upper furnace.
When smelting, bottom-blowing of converter flow set is 0.05m3/ min.t, bottom blown gas carry out nitrogen in oxygen blast 8min45s
The switching of gas and argon gas.The stage of blowing is opened using conventional rifle position, rifle position control is opened in 1900mm blows, and oxygen rifle flow is 29000m3/h。
Lower rifle is opened blow 1min20s after start plus lime and light dolomite, lime adding amount is light-burned at 3850kg/ furnace (ton steel 32kg)
Dolomite adds 1700kg/ furnace (ton steel 14.2kg).After one batch of material all adds, rifle position is gradually hung oneself 300mm, and flow is adjusted to
25000m3/h.1min55s starts that ore and light dolomite is added portionwise by 350~500kg/ batches, carries out temperature adjustment and slugging,
The total additional amount 4580kg of ore early period (ton steel 38.2kg), unprocessed dolomite additional amount are 2550kg (ton steel 21.3kg).Wait smelt
Oxygen content of smoke gas begin to decline after by 200kg~350kg lime/batch be added portionwise slag charge, and by 200~400kg/ batches in batches plus
Enter ore, to keep FeO content (maintaining 14%-17%) certain in slag, which is 7.65t (ton
Steel 63.5kg), while unprocessed dolomite or lime stone progress temperature adjustment are added by 200~350kg/ batches according to in-furnace temperature；In
Charging is completed when 14min25s, and oxygen lance position is increased to 2300mm, oxygen-supplying amount is reduced to lower limit 23000m3/h；In
When 15min55s, rifle position is forced down to 1750mm, presses rifle time 20s；Rifle is mentioned in 17min25s, then furnace, carries out thermometric sampling
And part clinker is poured out, and 1641 DEG C of liquid steel temperature at this time, molten steel C:0.05%, P:0.010%, after confirming temperature and molten steel composition
The tapping of falling furnace immediately, tapping use slag retaining cone.
It carries out splashing slag using low rifle position 1400mm after tapping, splashing the slag time is 3min55s；The furnace splashes after slag slag in furnace
All pour into cinder ladle.
The furnace Expenditure Levels are as follows: 43.3kg/ tons of steel of lime, slag charge wastage in bulk or weight are 62.7kg/ tons of steel, steel technology
1.162t/ tons of steel, smelting cycle 39.2min.
The group by this production technology produce one group of 11 low-phosphorous clean steel of furnace, produce before laser thickness gauge survey furnace bottom with a thickness of
704mm, molten bath slag lining tap face thickness as 717mm.The group produce after, laser thickness gauge survey furnace bottom with a thickness of
822mm, molten bath slag lining tap face thickness as 612mm, and furnace bottom increases obviously, and slag lining erosion is serious.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of method that converter rapid low consumption produces low-phosphorous special steel, it is characterised in that: converter top bottom blowing is used, it is former
Expect the weight percent of composition are as follows: molten iron 60~75% cleans steel scrap 25~40%, remaining is the pig iron；Specifically include following step
It is rapid:
Step 1, the clinker of a upper furnace all stays in finishing slag in the converter after splashing Slag treatment, then the raw material is added
Enter and prepares to smelt in furnace, 0.21 > (material quality dosage-converter tapping quantity) ÷ converter tapping quantity > 0.1；
Step 2, when smelting, bottom-blowing of converter is set, the stage of blowing is opened, by oxygen lance position down toward 1550~1650mm, adjust oxygen rifle
Flow is 33000~38000m3/ h, the kindling of lower rifle point is opened blow 35s~70s after start plus lime and light dolomite, the stone
19~29 ‰ that quality is the converter tapping quantity are added in ash, and it is the converter tapping quantity that quality, which is added, in the light dolomite
6.5~10 ‰, oxygen rifle is moved up into 100~250mm after all adding, oxygen rifle flow is adjusted to 26000~30000m3/ h, and root
Ore is added according to slugging situation in furnace and furnace temperature situation and carries out slugging and cooling, and quality≤tap is added in the ore
10‰；The speed for speed and the flow adjustment that the oxygen rifle moves up is both needed to meet the reaction stability in the converter；
Step 3, after flue gas during smelting oxygen content is begun to decline, batch lime is added portionwise by 200kg~500kg/, by 150~
250kg/ batches are added portionwise ore, temperature adjustment and slugging are carried out, to keep the FeO content in slag to maintain 14%-17%, single heat
The total additional amount of ore is no more than the 20 ‰ of the converter tapping quantity；After the completion of charging, oxygen lance position is increased to 2100~
2300mm, open blow into row to 10min~12min30s when, oxygen lance position is down to 1700~1900mm, then press rifle 30s with
On；Rifle is mentioned when opening and blowing into row to 10min30s~13min, then furnace, pours out part clinker, pour out clinker while progress
Thermometric sampling, confirmation meet in endpoint molten steel: the requirement of mass content >=0.10%, mass content≤0.008% of phosphorus of carbon
The tapping of falling furnace afterwards, endpoint molten steel temperature is at 1585~1615 DEG C.
Step 4, slag is splashed, clinkers whole in converter are stayed in converter to the smelting for being used for next heat after splashing slag.
2. the method that converter rapid low consumption according to claim 1 produces low-phosphorous special steel, it is characterised in that: in step 2
The bottom-blowing of converter is nitrogen argon suitching type, and it is 0.08m that flow, which is arranged, in bottom blowing3/ min.t, and carried out before converter smelting terminates
The argon bottom-blowing big flow end of 30s~50s is stirred, and bottom blowing flow set is 0.15m3/min.t。
3. the method that converter rapid low consumption according to claim 1 produces low-phosphorous special steel, it is characterised in that: the step
The clinker poured out in 3 accounts for 35~60% of total clinker quality in converter.
4. the method that converter rapid low consumption according to claim 1 produces low-phosphorous special steel, it is characterised in that: in step 3
Tapping is slag retaining cone and slide plate pushing off the slag using double gears.
5. the method that converter rapid low consumption according to claim 1 produces low-phosphorous special steel, it is characterised in that: in step 4
Oxygen lance position is 1700mm~1900mm when splashing slag, and splashing the slag time is 1min30s~3min, if clinker is partially dilute, before splashing slag
Light dolomite is added and carries out the control of terminal residue adjustment solid slag.
6. the method that converter rapid low consumption according to claim 1 produces low-phosphorous special steel, it is characterised in that: the raw material
Main component is C:4.23-5.12wt%, Si 0.21-0.92wt%, P:0.83-0.135%, molten iron temperature to middle molten iron than iron
Degree is 1354-1453 DEG C.
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| CN111363889A (en) * | 2020-03-20 | 2020-07-03 | 中天钢铁集团有限公司 | Efficient phosphorus removal method for combined blown converter |
| CN111926139A (en) * | 2020-08-27 | 2020-11-13 | 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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| CN111363889B (en) * | 2020-03-20 | 2021-10-01 | 中天钢铁集团有限公司 | Efficient phosphorus removal method for combined blown converter |
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| CN111926139A (en) * | 2020-08-27 | 2020-11-13 | 北京科技大学 | Method for prolonging service life of converter lining during production of low-carbon low-phosphorus steel |
| CN112575137A (en) * | 2020-10-26 | 2021-03-30 | 邯郸钢铁集团有限责任公司 | Method for direct tapping during high-speed rail steel converter smelting |
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| CN113201621A (en) * | 2021-05-19 | 2021-08-03 | 宝武集团鄂城钢铁有限公司 | Low-iron-loss-mode slag-remaining single-slag smelting operation method for converter |
| CN114438276A (en) * | 2022-02-11 | 2022-05-06 | 山东钢铁集团永锋临港有限公司 | Method for shortening smelting period of converter |
| CN114438276B (en) * | 2022-02-11 | 2022-08-09 | 山东钢铁集团永锋临港有限公司 | Method for shortening smelting period of converter |
| CN114774621A (en) * | 2022-03-31 | 2022-07-22 | 宝武集团鄂城钢铁有限公司 | Extremely-low-cost converter smelting production method for deformed steel bar |
| CN114774621B (en) * | 2022-03-31 | 2023-03-28 | 宝武集团鄂城钢铁有限公司 | Extremely-low-cost converter smelting production method for deformed steel bar |
| CN114774614A (en) * | 2022-04-14 | 2022-07-22 | 首钢集团有限公司 | Converter steelmaking method |
| CN115466903A (en) * | 2022-07-13 | 2022-12-13 | 海峡(晋江)伞业科技创新中心有限公司 | High-strength special steel and production process thereof |
| CN115323098A (en) * | 2022-07-21 | 2022-11-11 | 北京科技大学 | High scrap steel ratio converter smelting process for producing high-quality and special steel |
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