CN101457272A - Two-step stainless steel smelting method - Google Patents
Two-step stainless steel smelting method Download PDFInfo
- Publication number
- CN101457272A CN101457272A CNA2009100137446A CN200910013744A CN101457272A CN 101457272 A CN101457272 A CN 101457272A CN A2009100137446 A CNA2009100137446 A CN A2009100137446A CN 200910013744 A CN200910013744 A CN 200910013744A CN 101457272 A CN101457272 A CN 101457272A
- Authority
- CN
- China
- Prior art keywords
- steel
- slag
- smelting
- add
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a stainless steel smelting method by a two-step process. The method comprises the following steps: (1) smelting dephosphorized molten iron; (2) smelting semisteel; (3) lifting the semisteel to a deslagging station for deslagging treatment; (4) adding the semisteel to a GOR refining furnace for air refining; (5) refining; (6) continuous casting and (7) finishing, thinning and then rolling. Compared with the present method for producing the stainless steel by smelting, the method has the advantages of wide application scope of raw materials, low energy and resource consumption, strong variety development capacity, high recovery rate of chromium-nickel metal, high production efficiency and the like. Sulfide, oxide, silicate and punctiform non-metallic inclusion in the steel have low grade, the dephosphorized molten iron is provided by a top-bottom combined blowing converter and smelting is performed by the two-step process in an EAF+GOR refining furnace, thus the method has relatively low production cost and relatively large cost advantage, and the performance of a rolled finished product is consistent with a user quality standard.
Description
Technical field
The present invention relates to a kind of stainless steel smelting method, specifically a kind of employing dephosphorization molten iron and high carbon alloy, by the furnace melting half steel, the two-step stainless steel smelting method of composition is adjusted in GOR converter decarburization.
Background technology
Stainless steel is common steel alloy, generally can be divided into austenitic stainless steel, ferritic stainless steel, Martensite Stainless Steel and duplex stainless steel.
The stainless steel-making process method can be divided into single stage method, two step method and three-step approach at present.
1, single stage method
Single stage method is meant operations such as finishing scrap melting, decarburization, reduction and refining in electric furnace, and one step of furnace charge is smelted into stainless steel.Along with the continuous development of furnace outer refining process, the single stage method smelting process for production is because smelting cycle is long, and operating rate is low, and the production cost height is progressively eliminated.
2, two step method
Two step method mainly is to be first furnace melting waste steel and alloy material with electric furnace, produces stainless steel and just makes steel water, is refined into qualified stainless molten steel then in different refining furnace (as AOD, CLU, K-OBM, KC B, MRP, GOR, VOD etc.).Just furnace can be electric furnace or converter.Refining furnace can be divided into the refining under normal pressure and vacuum state again in the two step method, thereby forms EAF-converter (AOD, CLU, K-OBM, KCB, MRP, GOR) two-step process and EAF-vacuum oxygen (RH-OB, RH-KTB, VOD) two-step process.
3, three-step approach
The typical process flow of three-step approach is first furnace-AOD stove-vacuum oxygen refining stove.Just furnace only plays fusing refining effect just, and first furnace can be electric furnace or converter, and being responsible for provides steel-making water just to refining furnaces such as AOD.The function of AOD stove mainly is quick decarburization, and avoids the oxidation of chromium, with the K-OBM-S in addition that the AOD stove and accessory has the smelting equipment of said function to use always, K-TBOP, MRP, CLU, KCB-S etc.Finish the fine setting of the ultimate constituent, the control of purity by vacuum oxygen refining stove (VOD, RH-OB, RH-KTB etc.) at last.This method can be used to the stainless steel of production Ultra-low carbon, ultralow nitrogen.
Deficiencies such as above smelting technology ubiquity smelting cost is higher, and smelting cycle is long.
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of reduction stainless production cost, improve the stainless steel processing characteristics, reducing sulfide, oxide compound, silicate, point-like non-metallic inclusion rank in the steel, is the two-step stainless steel smelting method of raw material with the dephosphorization molten iron.
For achieving the above object, the present invention adopts following technical proposals: a kind of two-step stainless steel smelting method may further comprise the steps:
1) smelting of dephosphorization molten iron;
2) half steel is smelted: add lime, high carbon alloy and returns in the electric furnace, send electric smelting, when furnace charge energising fusing reach cumulative volume 85% after be blended into the dephosphorization molten iron of step 1), after temperature and composition meet the requirements, tapping;
3) half steel hangs the station of the skimming processing of skimming, time≤20 minute, and the rate of skimming 〉=95% is got the half steel sample and is done total analysis, and half steel composition result of laboratory test feeds back to GOR refining furnace master control room dominant hand, and the back half steel temperature requirement of skimming is greater than 1550 ℃;
4) half steel is blended in the GOR refining furnace, by the distribution decarbonization and protecting chromium, adjusts composition and temperature, reaches the tapping requirement;
5) LF stove refining: by the program refinement voltage parameter of elder generationization slag, intensification, insulation, the addition sequence of--lime--ferrosilicon powder carries out residue adjustment according to fluorite, makes white slag; The free oxygen content of measuring molten steel is less than 20 * 10
-6, if oxygen level is higher, by feeding the silicon-calcium wire adjustment; After the refining of LF stove is finished, soft blow argon time 〉=8min;
6) continuous casting: pulling rate is controlled at 0.70～1.2m/min, adopts liquid level automatic fine tuning, dynamically gently depresses, induction stirring and automatic distribution water technology; Aforementioned Technology is a prior art, does not repeat them here;
7) be rolled after the finishing reconditioning.
In the step 1): molten iron requires S≤0.030%, temperature 〉=1250 ℃, thickness of slag layer＜50mm; The dephosphorization molten iron adopts top and bottom combined blown converter to blow, and during dephosphorization treatment, whole process is carried out bottom blowing nitrogen; Under the 1.5MPa operating pressure, bottom blowing gas intensity reaches 0.12～0.2Nm
3/ t.min, the blowing of following oxygen rifle blow 3～10 minutes, outwelled pre-slag, continued down that the oxygen rifle blows, blow end point, carbon content is controlled at below 1.0%, P≤0.010%, the quantity of slag＜0.3 ton requires 1580--1640 ℃ of dephosphorization converter tapping temperature; To be blended in the electric furnace by ladle at the dephosphorization molten iron of having bessemerized then.
Step 2) in: electric furnace is at when filling with substance, be added to 1.0～2.0 tons of lime of furnace bottom earlier, after pack into high-carbbon iron alloy and returns, in strict accordance with the electric system operation of dispensing, starting the arc phase power adopts four～seven grades, 1～2 grade of reactance, main melting period is selected three-five grades of power, 1 grade of reactance, powertrace select 1～2, when furnace charge energising fusing reach cumulative volume more than 85% after be blended into the dephosphorization molten iron of step 1), forbid to use the coherent oxygen lance oxygen blast: sampling immediately behind the hot metal charging midway, thermometric, when temperature 〉=1570 ℃, but heating by O2 blowing, and power taking stove first molten steel sample of melting period carries out total analysis midway, when temperature 〉=1640 ℃, enter reduction period after the furnace charge fusing thoroughly, add ferrosilicon 2～6Kg and winding-up carborundum powder 3～8Kg, stir while feeding in raw material by the ton steel; According to the slag condition, add fluorite 1～4kg/t working the slag flowability, closed fire door 5～10 minutes, fully reduction; After reaching processing requirement, composition taps; Get reduction period slag sample, measuring frequency section Chrome-free slag line, quality is crisp, and temperature reaches 1600～1670 ℃, and composition is tapped after reaching processing requirement; The tapping of tapping slot type is adopted in tapping, and (this tapping mode is a prior art, do not repeat them here), require behind the first slag steel or slag with going out during tapping, dash in the hope of fierce mixing in ladle, further chromium, washing are mingled with in the reducing slag, and slag is with going out can reduce molten steel secondary oxidation and radiating and cooling.
In the step 4): electric furnace goes out that half steel requirement carbon containing massfraction is 1.0%～2.5%, the silicone content massfraction is for less than 0.5%, look the difference of stainless steel grade, the Composition Control scope difference of chromium, nickel, chromium requires massfraction to be controlled at the middle upper limit of internal control composition, nickel is controlled at lower limit, as chromium standard analysis in the SUS410S stainless steel is 11.5%-13.5%, and the internal control target is 13.2%; 1550～1600 ℃ of temperature; After half steel is blended into the GOR refining furnace, carry out refining;
Wherein the smelting of GOR refining furnace divides three phases to carry out:
Fs needs 18～20 minutes, mainly is the Sweet natural gas of oxygen and protection bottom blowing nozzle at this stage bottom blown gas; The pipe oxygen flow is 60～100m in fs
3/ min, outer tube gas discharge 6～10m
3/ min; In the converting process, add the lime that is no less than 2500kg to the GOR refining furnace in batches; The joining day of lime, and add total amount and depend on initial temperature, the chemical ingredients of half steel, the weight and the composition of cold metal material; Supply nitrogen, interior pipe flow 25～35m during final turndown
3/ min; Outer tube 3～7m
3/ min; The carbon content massfraction is 0.15%～0.25% in the steel when entering next stage, temperature is 1650～1760 ℃;
Subordinate phase needs 13～18 minutes approximately, the flow 30～50m of pipe mixed gas in the subordinate phase
3/ min supplies Sweet natural gas 3～8m when the outer tube subordinate phase begins
3/ min; The 3-4 minute, C≤1.5% o'clock, displacement argon gas 4～10m
3/ min is replaced as the nitrogen blowing during nitrogen-containing steel smelting; Add the slag former attemperation in subordinate phase, add-on is below the 10kg/t; When subordinate phase finished, it was 0.03%～0.015% that basicity of slag 2.8-4.0, carbon drop to massfraction.
Phase III is 3-5 minute, enters restoring operation; The reduction phase blowing argon gas is replaced as the nitrogen blowing during refining nitrogenous steel; Interior pipe is 30～40m
3/ min, outer tube 5～10m
3/ min; The chromium that begins to add ferrosilicon 20Kg-35Kg/t steel reduction-oxidation behind the reduction 3min; Add blow off behind ferrosilicon 4～8min, turndown carries out thermometric, gets the molten steel sample and carry out total analysis; For the assuranceization slag is good, the add-on of fluorite is the 15--20% that lime adds massfraction, blowing argon gas after the adjustment chemical ingredients, nitrogen blowing 2～5min tapping during nitrogen-containing steel smelting;
The GOR refining furnace adds the order of iron alloy: ferrochrome and nickel are before pouring half steel into, and first, second stage of jetting adds; Reduction phase is adjusted chromium, nickel composition, and reductase 12-10min adds manganese metal, metal molybdenum, vanadium iron, ferro-niobium, ferrosilicon, Argon after the adjustment chemical ingredients, and liquid steel temperature is tapped in the time of 1600 ℃～1650 ℃ in nitrogen blowing 2～10min during nitrogen-containing steel smelting, stove; During tapping, in bag, add silico-calcium 1～4Kg/ ton steel, ladle soft blow argon in the tapping process.
In the step 5), the continuous casting pulling rate is controlled at 0.70-1.2m/min, and the submerged nozzle angle is selected for use according to steel grade, and the martensite steel grade is+15 °, and the baking of exhausting stove is used at the mouth of a river under the middle bag, guarantees temperature 〉=1000 ℃; Molten steel arrives at a station, and middle bag Argon 〉=1min drives away air in the bag; Open and water 10 minutes, get the continuous casting steel water sample, the oxygen in the analytical sample, nitrogen content; The bag liquid level guarantees at 〉=900mm in during normal cast; Liquid level fluctuation of crystallizer must not surpass ± 6mm in the casting process, and preferred plan adopts the liquid level automatic control system; Covering slag will be deceived slag operation, and liquid slag layer thickness must be controlled at 10-20mm, in time observes the level change situation, will in time choose after the slag bar forms to guarantee to lubricate well; Stirring parameter, electric current: 250～400A, frequency: 2～6.2HZ, hydraulic vibration select stainless steel sinusoidal vibration pattern for use.
The Martensite Stainless Steel that adopts the technology of the present invention to produce, with 06Cr13 (SUS410S) is example, after testing, its technical indicator is: C≤0.05%, Si0.30%-0.60%, Mn≤0.50%, P≤0.035%, S≤0.008%, Cr13.0-13.5%, Ni≤0.20%, Cu0.08-0.1%, sulfide≤1 grade, oxide compound≤1 grade, point-like non-metallic inclusion≤1 grade, compare with the stainless steel that existing smelting method is produced, S is low by 10%, and oxygen level is low by 20%, and the point-like non-metallic inclusion hangs down the 0.5--1 level.
Beneficial effect of the present invention is: adopt electric furnace of the present invention+GOR refining furnace two-step approach to smelt, the used dephosphorization molten iron of electric furnace adopts top and bottom combined blown converter smelting, has improved dephosphorization rate, has reduced the quantity of slag, has reduced iron loss etc.; GOR refining furnace raw material can adopt half steel or dephosphorization molten iron to add the part high carbon alloy directly to smelt, and smelting cost reduces greatly, and process is accurately control liquid steel temperature and composition automatically, and smelting cycle was controlled at 60-70 minute.Compare with traditional technology have that raw material is applied widely, Energy resources consume low, the variety development ability strong, chromium nickel metal recovery rate height, production efficiency advantages of higher, because sulfide, oxide compound, silicate, point-like non-metallic inclusion rank in the steel are low, the end properties that rolls out meets the user quality standard.Can smelt the stainless steel of more than 120 specification kinds of 5 big classes such as martensite, austenite, ferrite.
Embodiment
The present invention is further described below in conjunction with embodiment.
Embodiment
Stainless steel plant in our company implements this programme, to produce Martensite Stainless Steel (C≤0.05% of 06Cr13 (SUS410S) trade mark, Si0.30-0.60%, Mn≤0.50%, P≤0.035%, S≤0.008%, Cr13.0-13.5%, Ni≤0.20%, Cu0.08-0.1%) be example, technical process is the dephosphorization molten iron → electric furnace → station → GOR that skims → LF → continuous casting → finishing → be up to the standards → rolling.May further comprise the steps:
1, dephosphorization molten iron smelting: the dephosphorization molten iron adopts top and bottom combined blown converter to blow, during dephosphorization treatment, top blast work oxygen is pressed (0.70～0.85) MPa, basic rifle position 1000mm, according to the type of furnace and Intake Quantity, suitably to adjust, whole process is carried out bottom blowing nitrogen, under the 1.5MPa operating pressure, bottom blowing gas intensity will reach 0.12-0.2Nm
3/ tmin, lime is pressed (60～70) kg/t, opens once to add 1/2～2/3 of total amount after blowing, and all the other divide small quantities of the adding, add before blowing begins back 6-9min.Finishing slag R is controlled at 2.5-3.2.Fluorite adds according to changing the slag situation, but total amount is not more than 3-5kg/t.Rhombspar is with the disposable adding of a batch of material, and MgO content is controlled at 8%-12% (suitably adjusting according to working of a furnace situation).The blowing of following oxygen rifle blow 5-10 minutes, outwelled pre-slag, continued down that the oxygen rifle blows, blow end point, and carbon content is controlled at below 1.0%, P≤0.010%, the quantity of slag＜0.3 ton requires 1580--1640 ℃ of dephosphorization converter tapping temperature.The dephosphorization converter smelting finishes, and carbon in the dephosphorization molten iron is not done any adjustment, forbids to add carburelant carburetting, slag under forbidding in the tapping process.
2, electric furnace is at when filling with substance, be added to 1.0～2.0 tons of lime of furnace bottom earlier, after the high carbon ferro-chrome of packing into, in strict accordance with the electric system operation of dispensing, four～seven grades of starting the arc phases, 1～2 grade of reactance, main melting period is selected three～five grades, 1 grade of reactance, and powertrace selects 1～2, when furnace charge energising fusing reach cumulative volume more than 85% after be blended into the dephosphorization molten iron of step 1), forbid to use the coherent oxygen lance oxygen blast midway; Behind the hot metal charging immediately the sampling, thermometric, when temperature 〉=1570 ℃, but heating by O2 blowing, power taking stove melting period-individual molten steel sample carries out total analysis midway, when temperature 〉=1640 ℃, enter reduction period after the furnace charge fusing thoroughly, add ferrosilicon 2～6Kg and winding-up carborundum powder 3～8Kg, stir while feeding in raw material by the ton steel; According to the slag condition, add fluorite 1～4kg/t working the slag flowability, closed fire door 5～10 minutes, fully reduction; After reaching processing requirement, composition taps; Get reduction period slag sample, measuring frequency section Chrome-free slag line, quality is crisp, and the half steel temperature reaches 1600～1670 ℃ in the stove, and composition is tapped after reaching processing requirement; The tapping of tapping slot type is adopted in tapping, requires behind the first slag steel or slag with going out during tapping, dashes in the hope of fierce mixing in ladle, and further chromium, washing are mingled with in the reducing slag, and slag is with going out can reduce molten steel secondary oxidation and radiating and cooling.
3, half steel hangs the station of the skimming processing of skimming, time≤20 minute, and the rate of skimming 〉=95% is got the half steel sample and is done total analysis, and half steel composition result of laboratory test feeds back to GOR refining furnace master control room dominant hand, and the back half steel temperature requirement of skimming is greater than 1550 ℃;
4, electric furnace goes out that half steel requirement carbon containing massfraction is 1.0%～2.5%, the silicone content massfraction is for less than 0.5%, and chromium is controlled at 13.0-13.5%, 1550～1600 ℃ of temperature.After half steel is blended into the GOR refining furnace, carry out refining.The smelting of GOR refining furnace divides three phases to carry out:
Fs needs 18～20 minutes, mainly is the Sweet natural gas of oxygen and protection bottom blowing nozzle at this stage bottom blown gas; The pipe oxygen flow is 60～100m in fs
3/ min, outer tube gas discharge 5～10m
3/ min; In the converting process, add the lime that is no less than 2500kg to the GOR refining furnace in batches; The joining day of lime, and add total amount and depend on initial temperature, the chemical ingredients of half steel, the weight and the composition of cold metal material; Supply nitrogen, interior pipe flow 20～35m during final turndown
3/ min; Outer tube 5～10m
3/ min; The carbon content massfraction is 0.15%～0.25% in the steel when entering next stage, temperature is 1700～1760 ℃;
Subordinate phase needs 13～18 minutes approximately, the flow 30～50m of pipe mixed gas in the subordinate phase
3/ min supplies Sweet natural gas 3～5m when the outer tube subordinate phase begins
3/ min; Began C≤1.5% o'clock, displacement argon gas 4～10m the 3-4 minute
3/ min; Add the slag former attemperation in subordinate phase, add-on is below the 10kg/t; When subordinate phase finishes, basicity of slag 2.8-4.0, carbon drops to below 0.03%.
Phase III is 3-5 minute, enters restoring operation; The reduction phase blowing argon gas; Interior pipe is 30～40m
3/ min, outer tube 5～10m
3/ min; The chromium that begins to add ferrosilicon 20Kg-35Kg/t steel reduction-oxidation behind the reduction 3min; Add blow off behind ferrosilicon 4～8min, turndown carries out thermometric, gets the molten steel sample and carry out total analysis; For the assuranceization slag is good, the add-on of fluorite is the 15--20% that lime adds massfraction, blowing argon gas 2～5min tapping after the adjustment chemical ingredients;
The ferrochrome of GOR refining furnace adjustment composition can be before pouring half steel into.Reduction phase can be adjusted chromium component.Adjust Argon 2～10min after the chemical ingredients, just can tap during 1600～1650 ℃ of temperature.During tapping, in bag, add silico-calcium 1-4Kg/ ton steel, ladle soft blow argon in the tapping process.With electrolytic manganese manganese in the steel is assigned to 0.3%～0.4% of massfraction, copper is assigned to 0.09%～1.0% of massfraction, and adopt the method that in ladle, adds to add with electrolytic copper.
5, refining is by the parameters such as program refinement voltage of elder generationization slag, intensification, insulation, and the addition sequence of--lime--ferrosilicon powder carries out residue adjustment according to fluorite, makes white slag; The fine setting composition is fed silicon-calcium wire by 3m/t, bottom blowing flow set 100L/min during line feeding.The free oxygen content of measuring molten steel is less than 20 * 10
-6, oxygen level is higher, by feeding the silicon-calcium wire adjustment.The refining of LF stove is finished, soft blow argon time 〉=6min.
6, continuous casting superheating temperature control is 20～30 ℃, and 1525～1550 ℃ of middle bag temperature are wrapped 1580～1610 ℃ of temperature greatly, and pulling rate is controlled at 0.70-1.2m/min, submerged nozzle angle+15 °, and the baking of exhausting stove is used at the mouth of a river under the middle bag, guarantees temperature 〉=1000 ℃.Molten steel arrives at a station, and middle bag Argon 〉=1min drives away air in the bag.Open and water 10 minutes, get the continuous casting steel water sample, the oxygen nitrogen content in the analytical sample.The bag liquid level guarantees at 〉=900mm in during normal cast.Liquid level fluctuation of crystallizer must not surpass ± 5mm in the casting process, and preferred plan adopts the liquid level automatic control system; Covering slag will be deceived slag operation, and liquid slag layer thickness must be controlled at 10-15mm, in time observes the level change situation, will in time choose after the slag bar forms to guarantee to lubricate well.Stirring parameter, electric current: 250～400A, frequency: 2～6.2HZ, hydraulic vibration select stainless steel sinusoidal vibration pattern for use.Crystallizer discharge control broadside 180～250m
3/ h; Narrow limit 160mm is thick: 20～25m
3/ h; 200mm thickness, 25～30m
3/ h.3-8 ℃ of the Inlet and outlet water temperature difference.Cooling system adopts 410 steel water allocation model.
During 7, finishing ordinary production 06Cr13 (SUS410S), adopt cooling in heap.Set automatic reconditioning program, grind clean casting skin earlier, reconditioning passage≤30mm checks the casting billet surface defective, and reconditioning will be increased the weight of in the position that enemy, rear and local defect are many.
The Martensite Stainless Steel 06Cr13 (SUS410S) that this processing method is produced, chemical ingredients satisfies standard-required fully after testing, and performance meets the user quality standard, qualification rate 100%.(seeing the following form 1,2)
Table 1 06Cr13 (SUS410S) composition statistics
The check of table 2 low power sample
Claims (5)
1. a two-step stainless steel smelting method is characterized in that, may further comprise the steps:
1) smelting of dephosphorization molten iron;
2) half steel is smelted: add lime, high carbon alloy and returns in the electric furnace, send electric smelting, when furnace charge energising fusing reach cumulative volume 85% after be blended into the dephosphorization molten iron of step 1), after temperature and composition meet the requirements, tapping;
3) half steel hangs the station of the skimming processing of skimming, time≤20 minute, and the rate of skimming 〉=95% is got the half steel sample and is done total analysis, and half steel composition result of laboratory test feeds back to GOR refining furnace master control room dominant hand, and the back half steel temperature requirement of skimming is greater than 1550 ℃;
4) half steel is blended in the GOR refining furnace, by the distribution decarbonization and protecting chromium, adjusts composition and temperature, reaches the tapping requirement;
5) LF stove refining: by the program refinement voltage parameter of elder generationization slag, intensification, insulation, the addition sequence of--lime--ferrosilicon powder carries out residue adjustment according to fluorite, makes white slag; The free oxygen content of measuring molten steel is less than 20 * 10
-6, if oxygen level is higher, by feeding the silicon-calcium wire adjustment; After the refining of LF stove is finished, soft blow argon time 〉=6min;
6) continuous casting: pulling rate is controlled at 0.70～1.2m/min, adopts liquid level automatic fine tuning, dynamically gently depresses, induction stirring and automatic distribution water technology;
7) be rolled after the finishing reconditioning.
2. two-step stainless steel smelting method according to claim 1 is characterized in that, in the described step 1): water requirement S≤0.030% is smelted iron in the dephosphorization converter, temperature 〉=1250 ℃, thickness of slag layer＜50mm; The dephosphorization molten iron adopts top and bottom combined blown converter to blow, and during dephosphorization treatment, whole process is carried out bottom blowing nitrogen; Under the 1.5MPa operating pressure, bottom blowing gas intensity reaches 0.12～0.2Nm
3/ tmin, the blowing of following oxygen rifle blow 3～10 minutes, outwelled pre-slag, continued down that the oxygen rifle blows, blow end point, carbon content is controlled at below 1.0%, P≤0.010%, the quantity of slag＜0.5 ton requires 1580～1640 ℃ of dephosphorization converter tapping temperature; To be blended in the electric furnace by ladle at the dephosphorization molten iron of having bessemerized then.
3. two-step stainless steel smelting method according to claim 1, it is characterized in that, described step 2) in: electric furnace is at when filling with substance, be added to 1.0～2.0 tons of lime of furnace bottom earlier, after pack into high-carbbon iron alloy and returns, in strict accordance with the electric system operation of dispensing, starting the arc phase power adopts four～seven grades, 1～2 grade of reactance, main melting period is selected three～five grades of power, 1 grade of reactance, and powertrace selects 1～2, when furnace charge energising fusing reach cumulative volume 85% after be blended into the dephosphorization molten iron of step 1), forbid to use the coherent oxygen lance oxygen blast midway; Behind the hot metal charging immediately the sampling, thermometric, when temperature 〉=1550 ℃, but heating by O2 blowing, power taking stove first molten steel sample of melting period carries out total analysis midway, when temperature 〉=1640 ℃, enter reduction period after the furnace charge fusing thoroughly, add ferrosilicon 2～6Kg and winding-up carborundum powder 3～8Kg, stir while feeding in raw material by the ton steel; Add fluorite 1～4kg/t working the slag flowability, closed fire door 5～10 minutes, fully reduction; After reaching processing requirement, composition taps; Get reduction period slag sample, measuring frequency section Chrome-free slag line, quality is crisp, and temperature reaches 1600～1670 ℃, and composition is tapped after reaching processing requirement; The tapping of tapping slot type is adopted in tapping, requires behind the first slag steel or slag with going out during tapping, dashes in the hope of fierce mixing in ladle, and further chromium, washing are mingled with in the reducing slag; Slag is with going out can reduce molten steel secondary oxidation and radiating and cooling simultaneously.
4. two-step stainless steel smelting method according to claim 1, it is characterized in that, in the described step 4): electric furnace goes out that half steel requirement carbon containing massfraction is 1.0%～2.5%, the silicone content massfraction is less than 0.5%, look the difference of stainless steel grade, the Composition Control scope difference of chromium, nickel, chromium requires massfraction to be controlled at the middle upper limit of internal control composition, and nickel is controlled at lower limit; 1550～1600 ℃ of temperature; After half steel is blended into the GOR refining furnace, carry out refining;
Wherein the smelting of GOR refining furnace divides three phases to carry out:
Fs needs 18～20 minutes, mainly is the Sweet natural gas of oxygen and protection bottom blowing nozzle at this stage bottom blown gas; The pipe oxygen flow is 60～100m in fs
3/ min, outer tube gas discharge 6～10m
3/ min; In the converting process, add the lime that is no less than 2500kg to the GOR refining furnace in batches; The joining day of lime, and add total amount and depend on initial temperature, the chemical ingredients of half steel, the weight and the composition of cold metal material; Supply nitrogen, interior pipe flow 25～35m during final turndown
3/ min; Outer tube 3～7m
3/ min; The carbon content massfraction is 0.15%～0.25% in the steel when entering next stage, temperature is 1650～1760 ℃;
Subordinate phase needs 13～18 minutes approximately, the flow 30～50m of pipe mixed gas in the subordinate phase
3/ min supplies Sweet natural gas 3～8m when the outer tube subordinate phase begins
3/ min; The 3-4 minute, C≤1.5% o'clock, displacement argon gas 4～10m
3/ min is replaced as the nitrogen blowing during nitrogen-containing steel smelting; Add the slag former attemperation in subordinate phase, add-on is below the 10kg/t; When subordinate phase finished, it was 0.03%～0.015% that basicity of slag 2.8～4.0, carbon drop to massfraction.
Phase III is 3-5 minute, enters restoring operation; The reduction phase blowing argon gas is replaced as the nitrogen blowing during refining nitrogenous steel; Interior pipe is 30～40m
3/ min, outer tube 5～10m
3/ min; Begin to add ferrosilicon 20Kg～35Kg/t steel, the chromium of reduction-oxidation behind the reduction 3min; Add blow off behind ferrosilicon 4～8min, turndown carries out thermometric, gets the molten steel sample and carry out total analysis; For the assuranceization slag is good, the add-on of fluorite is 15～20% of a lime adding massfraction, blowing argon gas after the adjustment chemical ingredients, nitrogen blowing 2～5min tapping during nitrogen-containing steel smelting;
The GOR refining furnace adds the order of iron alloy: ferrochrome and nickel are before pouring half steel into, and first, second stage of jetting adds; Reduction phase is adjusted chromium, nickel composition, and reductase 12～10 minute add manganese metal, metal molybdenum, vanadium iron, ferro-niobium, ferrosilicon, Argon subsequently, and liquid steel temperature is tapped in the time of 1600 ℃～1680 ℃ in nitrogen blowing 2～10min during nitrogen-containing steel smelting, stove; During tapping, in bag, add silico-calcium 1～4Kg/ ton steel, ladle soft blow argon in the tapping process.
5. two-step stainless steel smelting method according to claim 1, it is characterized in that, in the described step 5), the continuous casting pulling rate is controlled at 0.70～1.2m/min, the submerged nozzle angle is selected for use according to steel grade, the martensite steel grade is+15 °, and the baking of exhausting stove is used at the mouth of a river under the middle bag, guarantees temperature 〉=1000 ℃; Molten steel arrives at a station, and middle bag Argon 〉=1min drives away air in the bag; Open and water 10 minutes, get the continuous casting steel water sample, the oxygen in the analytical sample, nitrogen content; The bag liquid level guarantees at 〉=900mm in during normal cast; Liquid level fluctuation of crystallizer is ± 6mm in the casting process, and preferred plan adopts the liquid level automatic control system; Covering slag will be deceived slag operation, and liquid slag layer thickness must be controlled at 10～20mm, in time observes the level change situation, will in time choose after the slag bar forms to guarantee to lubricate well; Stirring parameter, electric current: 250～400A, frequency: 2～6.2HZ, hydraulic vibration select stainless steel sinusoidal vibration pattern for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100137446A CN101457272B (en) | 2009-01-08 | 2009-01-08 | Two-step stainless steel smelting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100137446A CN101457272B (en) | 2009-01-08 | 2009-01-08 | Two-step stainless steel smelting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101457272A true CN101457272A (en) | 2009-06-17 |
| CN101457272B CN101457272B (en) | 2010-09-08 |
Family
ID=40768392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100137446A Active CN101457272B (en) | 2009-01-08 | 2009-01-08 | Two-step stainless steel smelting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101457272B (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829889A (en) * | 2010-04-30 | 2010-09-15 | 钟长林 | Production process of austenitic stainless steel bar by short-process continuous casting and rolling |
| CN102031329A (en) * | 2010-12-01 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Deoxidation and restoration method for smelting stainless steel in converter |
| CN102162063A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Ferritic stainless steel medium plate and manufacturing method thereof |
| CN102605258A (en) * | 2011-01-25 | 2012-07-25 | 宝山钢铁股份有限公司 | Martensitic stainless steel and manufacturing method thereof |
| CN102796963A (en) * | 2012-08-17 | 2012-11-28 | 山西太钢不锈钢股份有限公司 | Martensitic stainless steel rectangular billet continuous casting method |
| CN102912085A (en) * | 2012-11-09 | 2013-02-06 | 四川金广技术开发有限公司 | Stainless steel smelting method for improving content of MgO in slag of gas oxygen refining converter and LF (ladle furnace) |
| CN103255352A (en) * | 2013-04-19 | 2013-08-21 | 山西太钢不锈钢股份有限公司 | Method for improving and forming austenite in ultra-low carbon austenitic stainless steel bar |
| CN103290169A (en) * | 2013-05-30 | 2013-09-11 | 山西太钢不锈钢股份有限公司 | Method for smelting molybdenum-containing stainless steel |
| CN103924157A (en) * | 2014-04-01 | 2014-07-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Titanium-containing ferritic stainless steel smelting method |
| CN105177401A (en) * | 2015-11-02 | 2015-12-23 | 山东泰山钢铁集团有限公司 | Method for producing duplex stainless steel |
| CN105908101A (en) * | 2016-07-08 | 2016-08-31 | 四川西南不锈钢有限责任公司 | Ultra-low carbon and nitrogen steel and preparing method |
| CN106036963A (en) * | 2016-07-21 | 2016-10-26 | 柳州名品科技有限公司 | Preparation method of straw feed particle machine feeding barrel |
| CN106282487A (en) * | 2016-09-13 | 2017-01-04 | 北京北科中钢工程技术有限公司 | A kind of pre-dephosporizing method for molten iron |
| CN109321710A (en) * | 2018-11-27 | 2019-02-12 | 武钢集团襄阳重型装备材料有限公司 | The method that EBT furnace returns blow moulding smelting stainless steel |
| CN109628688A (en) * | 2018-12-29 | 2019-04-16 | 钢铁研究总院 | A kind of online Detoxified treatment method of chromium in stainless steel slag |
| CN110551871A (en) * | 2019-09-28 | 2019-12-10 | 西宁特殊钢股份有限公司 | smelting method capable of shortening smelting period of Consteel electric furnace |
| CN113430392A (en) * | 2021-06-18 | 2021-09-24 | 山西太钢不锈钢股份有限公司 | Efficient arc striking method for large-end-face electrode blank for electroslag smelting |
| CN113862551A (en) * | 2021-12-06 | 2021-12-31 | 北京科技大学 | Process control method for smelting stainless steel by blowing stainless steel dedusting ash in argon oxygen refining furnace |
| CN113981304A (en) * | 2021-09-30 | 2022-01-28 | 江西宝顺昌特种合金制造有限公司 | Production method for smelting F55 dual-phase steel by intermediate frequency furnace |
| CN114150148A (en) * | 2021-12-10 | 2022-03-08 | 四川鑫鼎新材料有限公司 | Method for extracting chromium-containing alloy from iron-chromium solid tailings to manufacture stainless steel product |
-
2009
- 2009-01-08 CN CN2009100137446A patent/CN101457272B/en active Active
Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162063A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Ferritic stainless steel medium plate and manufacturing method thereof |
| CN102162063B (en) * | 2010-02-23 | 2012-11-14 | 宝山钢铁股份有限公司 | Ferritic stainless steel medium plate and manufacturing method thereof |
| CN101829889A (en) * | 2010-04-30 | 2010-09-15 | 钟长林 | Production process of austenitic stainless steel bar by short-process continuous casting and rolling |
| CN102031329A (en) * | 2010-12-01 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Deoxidation and restoration method for smelting stainless steel in converter |
| CN102031329B (en) * | 2010-12-01 | 2012-09-05 | 山西太钢不锈钢股份有限公司 | Deoxidation and restoration method for smelting stainless steel in converter |
| CN102605258A (en) * | 2011-01-25 | 2012-07-25 | 宝山钢铁股份有限公司 | Martensitic stainless steel and manufacturing method thereof |
| CN102605258B (en) * | 2011-01-25 | 2014-05-07 | 宝山钢铁股份有限公司 | Martensitic stainless steel and manufacturing method thereof |
| CN102796963A (en) * | 2012-08-17 | 2012-11-28 | 山西太钢不锈钢股份有限公司 | Martensitic stainless steel rectangular billet continuous casting method |
| CN102796963B (en) * | 2012-08-17 | 2014-08-27 | 山西太钢不锈钢股份有限公司 | Martensitic stainless steel rectangular billet continuous casting method |
| CN102912085B (en) * | 2012-11-09 | 2014-08-06 | 四川金广技术开发有限公司 | Stainless steel smelting method for improving content of MgO in slag of gas oxygen refining converter and LF (ladle furnace) |
| CN102912085A (en) * | 2012-11-09 | 2013-02-06 | 四川金广技术开发有限公司 | Stainless steel smelting method for improving content of MgO in slag of gas oxygen refining converter and LF (ladle furnace) |
| CN103255352A (en) * | 2013-04-19 | 2013-08-21 | 山西太钢不锈钢股份有限公司 | Method for improving and forming austenite in ultra-low carbon austenitic stainless steel bar |
| CN103290169B (en) * | 2013-05-30 | 2014-10-22 | 山西太钢不锈钢股份有限公司 | Method for smelting molybdenum-containing stainless steel |
| CN103290169A (en) * | 2013-05-30 | 2013-09-11 | 山西太钢不锈钢股份有限公司 | Method for smelting molybdenum-containing stainless steel |
| CN103924157A (en) * | 2014-04-01 | 2014-07-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Titanium-containing ferritic stainless steel smelting method |
| CN103924157B (en) * | 2014-04-01 | 2016-01-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of smelting process of titaniferous ferritic stainless steel |
| CN105177401A (en) * | 2015-11-02 | 2015-12-23 | 山东泰山钢铁集团有限公司 | Method for producing duplex stainless steel |
| CN105908101A (en) * | 2016-07-08 | 2016-08-31 | 四川西南不锈钢有限责任公司 | Ultra-low carbon and nitrogen steel and preparing method |
| CN106036963A (en) * | 2016-07-21 | 2016-10-26 | 柳州名品科技有限公司 | Preparation method of straw feed particle machine feeding barrel |
| CN106282487B (en) * | 2016-09-13 | 2019-03-29 | 北京北科中钢工程技术有限公司 | A kind of pre-dephosporizing method for molten iron |
| CN106282487A (en) * | 2016-09-13 | 2017-01-04 | 北京北科中钢工程技术有限公司 | A kind of pre-dephosporizing method for molten iron |
| CN109321710A (en) * | 2018-11-27 | 2019-02-12 | 武钢集团襄阳重型装备材料有限公司 | The method that EBT furnace returns blow moulding smelting stainless steel |
| CN109628688A (en) * | 2018-12-29 | 2019-04-16 | 钢铁研究总院 | A kind of online Detoxified treatment method of chromium in stainless steel slag |
| CN110551871A (en) * | 2019-09-28 | 2019-12-10 | 西宁特殊钢股份有限公司 | smelting method capable of shortening smelting period of Consteel electric furnace |
| CN110551871B (en) * | 2019-09-28 | 2021-04-30 | 西宁特殊钢股份有限公司 | Smelting method capable of shortening smelting period of Consteel electric furnace |
| CN113430392A (en) * | 2021-06-18 | 2021-09-24 | 山西太钢不锈钢股份有限公司 | Efficient arc striking method for large-end-face electrode blank for electroslag smelting |
| CN113430392B (en) * | 2021-06-18 | 2022-07-01 | 山西太钢不锈钢股份有限公司 | Efficient arc striking method for large-end-face electrode blank for electroslag smelting |
| CN113981304A (en) * | 2021-09-30 | 2022-01-28 | 江西宝顺昌特种合金制造有限公司 | Production method for smelting F55 dual-phase steel by intermediate frequency furnace |
| CN113862551A (en) * | 2021-12-06 | 2021-12-31 | 北京科技大学 | Process control method for smelting stainless steel by blowing stainless steel dedusting ash in argon oxygen refining furnace |
| CN113862551B (en) * | 2021-12-06 | 2022-03-04 | 北京科技大学 | Process control method for smelting stainless steel by blowing stainless steel dedusting ash in argon oxygen refining furnace |
| CN114150148A (en) * | 2021-12-10 | 2022-03-08 | 四川鑫鼎新材料有限公司 | Method for extracting chromium-containing alloy from iron-chromium solid tailings to manufacture stainless steel product |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101457272B (en) | 2010-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101457272B (en) | Two-step stainless steel smelting method | |
| CN102329920B (en) | Method for smelting high-aluminum low-silicon ultra pure ferritic stainless steel | |
| CN108085577A (en) | A kind of smelting process for improving ton steel scrap ratio | |
| CN105112599B (en) | A kind of ultra-low phosphoretic steel smelting process | |
| CN101121987B (en) | Smelting method for titanium-containing austenitic stainless steel | |
| CN102952923B (en) | Process for smelting aluminum containing steel through calcium carbide deoxidation | |
| CN103194564B (en) | Process for producing ultra-low phosphorus steel | |
| CN101696462A (en) | Method for producing low phosphorus steel by smelting semisteel | |
| CN101403077A (en) | Biphase stainless steel and method for making same | |
| CN102002635A (en) | Steel for pressure container in thick specification and preparation method thereof | |
| CN107723415A (en) | The production method of the ultralow phosphorus ultra-low-carbon steel of super-low sulfur | |
| CN105177401A (en) | Method for producing duplex stainless steel | |
| CN107904489A (en) | Combine the low-nickel austenitic stainless steel smelted and technique with AOD furnace using reduction furnace | |
| CN102851447B (en) | Outside-furnace refining production method of steel used in carbon steel welding wire | |
| CN101328529B (en) | Process method for producing ultra-low phosphorus steel by molten steel external refining dephosphorization | |
| CN101381787B (en) | Smelting method of high-alloy steel | |
| CN103924157A (en) | Titanium-containing ferritic stainless steel smelting method | |
| CN105463149B (en) | A kind of silicon carbide deoxidation smelting Aluminum steel technique | |
| CN103255356B (en) | Method for preparing low-carbon stainless steel | |
| CN107557534A (en) | The production method of extremely low phosphoretic steel | |
| CN102312166B (en) | Stanniferous ferrite stainless steel and smelting method thereof | |
| CN107619899B (en) | A kind of production method and Steel material of low remaining chromium content molten steel | |
| CN114350879A (en) | Smelting method of low-carbon ultralow-sulfur pure iron | |
| CN104946845A (en) | Method for producing high-carbon-chrome bearing steel from vanadium-titanium-containing molten iron | |
| CN109280734B (en) | Smelting method of medium and high alloy ultra-low phosphorus steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20200730 Granted publication date: 20100908 |
|
| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20230730 Granted publication date: 20100908 |
|
| PP01 | Preservation of patent right | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20230730 Granted publication date: 20100908 |