CN104498805A - Production method of high-carbon low-nitrogen steel for strand wires - Google Patents
Production method of high-carbon low-nitrogen steel for strand wires Download PDFInfo
- Publication number
- CN104498805A CN104498805A CN201410838487.0A CN201410838487A CN104498805A CN 104498805 A CN104498805 A CN 104498805A CN 201410838487 A CN201410838487 A CN 201410838487A CN 104498805 A CN104498805 A CN 104498805A
- Authority
- CN
- China
- Prior art keywords
- steel
- slag
- argon
- nitrogen
- ton
- 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
Abstract
The invention relates to a production method of high-carbon low-nitrogen steel for strand wires, and belongs to the technical field of steelmaking application. A small 80-ton converter is used for performing a double-slag operation, endpoint carbon is controlled at 0.15%, the tapping temperature is 1610 DEG C, slag-stopping tapping is performed, the thickness of roughing slag in the tapping process of the converter is controlled between 0mm and 40mm; a nitrogen-doped C carburant contains N of 0.005 to 0.025%, 6kg of carbon is blended with per ton of steel, Si-Ca-Ba is used for deoxidizing, the addition amount is 2.0kg per ton of steel, and the addition amount is 4.5kg per ton of steel synthetic slag; an LF80-ton refining furnace uses a synthetic slag as a slag making material; a 150mm X 150mm small square billet is used for continuous casting, a crystallizer is electromagnetically stirred at 380A and 4Hz, a high alkalinity large ladle covering agent is used, and large ladle argon shielding, tundish argon blowing in the whole process, and submersed nozzle full protection casting are used. According to the steel for steel stranded wires produced by the invention, the nitrogen in steel is controlled within 40ppm, the quality level of steel for the steel stranded wires produced by a vacuum degassing process and a large square billet continuous casting twice-heating production process is achieved, the production cost of a steel making working procedure is substantially reduced, the competitiveness of enterprise products is increased, and the economic and social benefits are great.
Description
Technical field
The invention belongs to steelmaking technical field, particularly relate to the production method of a kind of high-carbon low nitrogen twisted wire steel, adopt the antivacuum flow process of primary converter (80 tons)+LF (80 tons) refining furnace+small billet (150mm × 150mm) continuous casting to produce the low nitrogen steel of high-carbon, be applicable to converter, LF stove, continuous small-billet casting adopting non-vacuum process production high-carbon low nitrogen twisted wire steel (carbon content 0.75 ~ 0.83%; Nitrogen content: 20 ~ 40ppm) method, be applied to high-grade building prestressed concrete field.
Background technology
In hypereutectoid steel (C>0.77%), nitrogen content is higher, and between dislocation, stress is larger, and the plasticity index of steel is poorer, and the time is longer.Nitrogen under specified conditions in steel can reduce the performance of material, and its existence reduces the toughness of steel and moulding.Steel is made to produce strain aging, aging precipitation and aged brittleness.Facts have proved, the nitrogen in steel controls in different levels, on the plasticity of steel and aging time impact very large.Certain factory (accompanying drawing 1) produces the different control processs of the nitrogen that high carbon steel SWRH82B experiences: nitrogen in steel controls between 55 ~ 90ppm, and average content is 65ppm.The reduction of area rolled off the production line the same day remains on 0 ~ 12.5%, and wire rod fracture is essentially the fracture apperance that only there is small viscous deformation in rock-candy structure or heart portion; The reduction of area of 10 days is 21.6%; The reduction of area of 15 days is 28.9%; The reduction of area of 30 days is 36.5%.
Nitrogen in steel controls between 45 ~ 70ppm, and average content is 55ppm.The reduction of area rolled off the production line the same day remains on 10 ~ 14.5%, and wire rod fracture sets one's heart the fracture apperance that only there is small viscous deformation in portion substantially; The reduction of area of 10 days is 29.2%; The reduction of area of 15 days is 32.3%; The reduction of area of 30 days is 37.4%.Nitrogen in steel controls between 32 ~ 42ppm, and average content is 38ppm.The reduction of area rolled off the production line the same day is 17.5%, and normal fracture is viscous deformation fracture apperance; The reduction of area of 5 days is 32.7%; The reduction of area of 10 days is 35.5%; The reduction of area of 11 ~ 30 days is for fluctuation is between 37.3 ~ 37.9%, and reduction of area fluctuation is very little.Nitrogen in steel controls between 20 ~ 32ppm, and average content is 27ppm.The reduction of area rolled off the production line the same day is the reduction of area of 26%, 2 days is 30%; The reduction of area of 5 days is 35%; The reduction of area fluctuation of 6 ~ 30 days is between 36 ~ 38%.
Generally speaking, nitrogen in steel content is lower, and the reduction of area of wire rod is higher, this namely process for making always pursue the more low better reason of Control of Nitrogen Content in steel, this relates to a production process cost and economical efficiency.
At present, produce high-carbon in the world, the major way of low nitrogen steel (60Si2Mn, GCr15, SWRH77B and SWRH82B) is: hot metal pretreatment → converter smelting+LF (+RH) refining → die casting (big cross section continuous casting square billet) → secondary cogging → high-speed rod controlled rolling → the most powerful cooling of stelmor.The mode that this is current Japan, Europe the most extensively adopts, Sang Deweike factory casting blank section as Sweden is 265mm × 365mm, Belgium ARBED casting machine section is 260mm × 260mm, the ROECHLJNG factory casting machine section of Germany is 240mm × 240mm, Di Sen ruhrort factory casting machine section 260mm × 330mm, the casting machine section of Nippon Steel is 220mm × 220mm.Baosteel adopts die casting process, by the semifinished product shutting out 130mm × 130mm ~ 160mm × 160mm at the beginning of die casting base (big cross section continuously cast bloom).Xing Gang adopts the cogging of 280mm × 325mm rectangular bloom to roll into 150mm × 150mm, its technological advantage is: the manufacturing requirements farthest meeting steel strand steel SWRH82B wire rod: Cleanliness of Molten Steel degree is good, and deoxidation removal of inclusions is fully (as Nippon Steel, Baosteel product: T [O] <20ppm; [N] <60ppm), second-heating cogging avoid the center segregation of continuously cast bloom and shrinkage cavity harm, surface quality is good, compression ratio is large.Shortcoming is complex procedures, lumber recovery is low, production cost is high, the many pollutions of energy consumption are large.
For reducing production cost, domestic each iron and steel enterprise, when smelting steel twisted wire steel SWRH82B, generally eliminates vacuum degasser, and nitrogen in steel, hydrogen content are higher.At present, nitrogen normal level in domestic SWRH82B steel is at 50 ~ 70ppm, simultaneously in the operation of rolling, due to imposed deformation, force cooling and phase transformation, in the wire rod just rolled off the production line, there is a large amount of unrelieved stresss (rolling stress, thermal stress, transformation stress).
Because the release of gas and unrelieved stress needs the time, this just causes SWRH82B wire rod to need to carry out ageing treatment before user uses.Nitrogen main harm in SWRH82B shows as to be formed with the element such as titanium, aluminium in steel is with corner angle and the crisp inclusion of property, after a certain amount of viscous deformation, first there is small cavity, along with the increase of deflection in inside, cavity quantity increases and polymerization mutually, finally causes Materials Fracture.Compared with plastic occluded foreignsubstance, nitride forms the origin that brittle inclusion more easily becomes ductile failure in the high carbon steel cold-drawn course of processing.
Most enterprises producing high carbon steel are subject to the restriction of existing smelting equipment, and cause the chemical composition of SWRH77B, SWRH82B steel unstable, the purity of steel is low.Particularly nitrogen in steel content fluctuation range from standard min fluctuate the upper limit, even exceed standard, cause the drawing of wire drawing and twisting process interrupt silk rate higher, the fracture apperance that causes because nitrogen in steel content is higher of typical case is shown in accompanying drawing 2,3.Like this, after causing product enterprise drawing, the index such as product strength, toughness fluctuation range is large, and product qualified rate is low; Another aspect is easy causes brittle failure in drawing, cannot process time serious.
Summary of the invention
The object of the invention is the production method providing a kind of high-carbon low nitrogen twisted wire steel, adopt the antivacuum flow process of primary converter (80 tons)+LF (80 tons) refining furnace+small billet (150mm × 150mm) continuous casting to produce high-carbon low nitrogen steel method, be applicable to converter, LF stove, the production of continuous small-billet casting adopting non-vacuum process high-carbon, low nitrogen steel twisted wire steel (carbon content 0.75 ~ 0.83%; Nitrogen content 20 ~ 40ppm); Comprise molten iron → converter smelting → slag-stopping tapping → ladle and join carbon, deoxidation and alloying → ladle slag upgrading → LF ladle refining → feed Si-Ca line → steel ladle bottom argon blowing soft blow → 150mm × 150mm small billet full guard casting → M-EMS → heating → controlled rolling → controlled cooling model.Be applied to high-grade building prestressed concrete field.
Adopt the steel strand steel that the present invention produces, nitrogen in steel controls within 40ppm, reach the steel strand steel quality level of vacuum degassing process, bloom continuous casting two pyrogene material explained hereafter, significantly reduce steel making working procedure production cost, increase Competitive Products, there is larger economic benefit and social benefit.
The technical parameter controlled in technique is as follows:
Converter adopts 80 tons of primary converter double-slag operations, and end point carbon controls by 0.15%, tapping temperature 1610 ~ 1620 DEG C, slag-stopping tapping, and the slag thickness in control converter tapping process is between 0 ~ 40mm; Micro-nitrogen carburelant: N:0.005 ~ 0.025%, joins carbon 6kg/ ton steel, uses Si-Ca-Ba deoxidation, add-on 2.0kg/ ton steel, 4.5kg/ ton steel synthetic slag;
LF (80 tons) refining furnace slag material uses synthetic slag, quickened lime: (CaO+MgO): 96.5 ~ 98%, SiO
2: 1 ~ 1.5%, CO
2: 1 ~ 2.0%, activity degree (4mol/ml-HCl, temperature 40 ± 1 DEG C, 10min) >350ml; Aluminium vanadine: Al
2o
3: 75 ~ 97%, SiO
2: 0 ~ 10%; CaO:1 ~ 5%, MgO:2 ~ 9.5%, H
2o:0 ~ 0.5%; Fluorite: CaF
2: 85.44 ~ 99%, SiO
2: 1 ~ 14%, S:0 ~ 0.5%, P:0 ~ 0.06%, total quantity of slag is according to 1.0 ~ 1.2 tons of controls, aluminium vanadine controls within 80 ~ 100Kg, the top of the slag adds Fe-Si powder and calcium carbide deoxidation, forms white slag and finishing slag TFe<1.0% in 15min minute, reduce a [o], S content in steel in power supply; Ca-Si line 1m/ ton steel is fed, soft blow argon after line feeding, flow 40 ~ 60L/min at the end of the process of LF stove, time>=10min, slightly spring up not exposed steel with the top of the slag and be advisable, make to be mingled with abundant floating in steel, refining treatment finishes target a [o]: 0 ~ 10ppm.
Adopt 150mm × 150mm continuous small-billet casting, crystallizer adopts the induction stirring of 380A, 4Hz, adopt the large covering agent of high alkalinity, large bag argon envelope, the omnidistance Argon of tundish, the casting of submerged nozzle full guard, pour into a mould according to the permanent casting speed control of 1.8 ~ 2.0m/min, Metal in Tundish superheating temperature controls at 25 ~ 35 DEG C, and continuous casting two cold adopts 0.75L/Kg specific water to pour into a mould; Use Mg-Ca matter dry type material strip barricade tundish, full guard is poured into a mould, large bag argon envelope protective casing argon flow amount 30 ~ 50L/min, and forbid when not adding sleeve pipe to add insulating covering agent to Zhong Bao impact zone, open and water front tundish argon filling, tundish selects high alkalinity insulating covering agent; Crystallizer protecting residue low viscosity high alkalinity special (viscosity: 1300 DEG C, 4 ~ 6 pools; Basicity (CaO/SiO
2): 0.80 ~ 1.1) high carbon steel covering slag, crystallizer discharge 120 tons/hour, Spraying Water of Nozzles in Secondary Cooling curve selects 0.75L/kg steel specific water; Ingot-guiding head opens M-EMS after going out crystallizer, and last stove stopper stops watering rear stopping induction stirring; Keep senior middle school's bag liquid level cast, liquid level 700mm in process, keeps liquid level stabilizing; Perform minimum middle bag liquid level to be not less than 400mm and to carry out cast system, open and water first base and last base crop, tail excise according to 2.0 meters of length.Connect and water when stopping watering, adopt after first stopping to water and pluck sleeve pipe.
Converter adopts double-slag operation, and head criticizes dephosphorized slag: oxygen-consumption: 820 ~ 900m
3/ N; Half steel temperature 1380 ~ 1400 DEG C, slag dual alkalinity R:2.0 ~ 2.5; Decarbonized slag: end point carbon controls by 0.10 ~ 0.20%, tapping temperature 1610 ~ 1630 DEG C, slag finishing slag dual alkalinity R:3.0 ~ 3.5; Slag-stopping tapping, controls slag thick between 0 ~ 40mm.
Adopt the carburetting of micro-nitrogen carburelant (N:0.005 ~ 0.025%) 6kg/ ton steel, adopt calsibar alloy 2.0kg/ ton steel-deoxidizing, 4.5kg/ ton steel synthetic slag; Enter LF refining station and control oxygen activity 8 ~ 18ppm, refining finishing slag Fe+MnO≤1.0%; Ca Si wire feeding 1m/ ton steel carries out being mingled with denaturing treatment, and soft argon blowing time was at 10 minutes.
Crystallizer is adopted to join induction stirring to reduce strand Central Carbon Segregation and shrinkage cavity; control Metal in Tundish superheating temperature 25 ~ 35 DEG C; adopt the casting of 1.80 ~ 2.0m/min pulling rate full guard; 0.75kg/L bis-specific waters; nitrogen content interval in steel is 0.0020 ~ 0.0033%; average out to 0.0027%, nitrogen level of control exceedes the level of control of hot metal pretreatment → converter smelting+LF (+RH) refining → die casting (big cross section continuous casting square billet) → secondary cogging technics flow process.
Concrete technology route:
Molten iron → 80 ton converter smelting (double-slag operation) → slag-stopping tapping → ladle deoxidation alloying → ladle slag upgrading → LF (80 tons) ladle refining (comprising temperature raising, alloy fine setting, desulfurization) → feeding Si-Ca line → ladle blows soft blow argon → 150mm × 150mm billet caster full guard casting, M-EMS → strand inspection → heating → controlled rolling → controlled cooling model.
Main technique measure:
-when molten iron Si:0.30 ~ 0.60%; S<0.040%, just can carry out smelting into stove.Converter adopts double-slag operation, and head criticizes dephosphorized slag: oxygen-consumption is according to 880m
3/ N controls; Half steel temperature 1360 ~ 1400 DEG C of range restraint, dephosphorized slag basicity controls according to 2.0, and duration of blast controlled according to 240 seconds.End point carbon controls by 0.15%, P≤0.015%, S≤0.020%, finishing slag basicity (CaO/SiO
2) >3.0.Tapping temperature is by 1610 ~ 1630 DEG C of controls.Early stage, slag-blocking ball coordinated later stage slag stop cone tapping, controlled ladle slag layer thickness 0 ~ 40mm.
-stokehold is joined carbon and is adopted the micro-nitrogen carburelant (N:0.005 ~ 0.025%) of 6kg/ ton steel, and rest part adopts common carburelant polishing; Use Si-Ca-Ba deoxidation, add-on 2.0kg/t steel.Adopt Mn-Fe to join manganese, Si-Fe joins silicon, and specific absorption controls according to 92%.
-the time of tapping >=5min.Adopt slag-stopping tapping, in ladle converter slag slag thick≤40mm; Binary synthetic slag 4kg/ ton steel synthetic slag is added during tapping; The omnidistance BOTTOM ARGON BLOWING (argon pressure must ensure between 1.0 ~ 1.1MPa) of tapping process.
Pre-blowing argon gas 3 minutes (flow 300 ~ 400NL/min) after-molten steel to refining station, and suitably adjust according to liquid level situation of seething.Slag material uses synthetic slag, quickened lime (CaO+MgO:93 ~ 99%, activity degree (4mol/ml-HCl, temperature 40 ± 1 DEG C, 10min) >350ml), aluminium vanadine (Al
2o
3: 75 ~ 95%; SiO
2: 0 ~ 10%)), fluorite (CaF
2: 90 ~ 98%; SiO
2: 0 ~ 9%), the quantity of slag is by 1.2 tons of controls (aluminium vanadine add less control within 100Kg), the top of the slag adds Fe-Si powder and calcium carbide deoxidation, strives for forming white slag and finishing slag TFe<1.0% in power supply in 15min minute, reduces a in steel as far as possible
o, S content.Guarantee Fast Slag Melting, various slag charge will add as early as possible.Last batch of alloy adjusts complete Argon stirring >=5min (flow 300 ~ 400NL/min), to ensure that alloying constituent is even.
Feed Ca-Si line 1m/ ton steel stove at the end of the process of-LF stove, carry out deformation processing of inclusion, after line feeding, soft blow argon (flow 40 ~ 60L/min) time must protect >=10min, slightly springs up not exposed steel and is advisable, make to be mingled with abundant floating in steel with the top of the slag.Refining treatment finishes target a [o]: 0 ~ 10ppm.
-150mm × 150mm continuous small-billet casting; crystallizer adopts the induction stirring of 380A, 4Hz; adopt the large covering agent of high alkalinity; large bag argon envelope, the omnidistance Argon of tundish, the casting of submerged nozzle full guard; cast is according to 1.80m/min casting speed control; Metal in Tundish superheating temperature 25 ~ 35 DEG C control, continuous casting two cold adopts 0.75L/Kg specific water to pour into a mould.
-large bag adopts band Ar to seal long nozzle, molding casting.Use Mg-Ca matter dry type material strip barricade tundish, full guard is poured into a mould, and large bag protective casing argon flow amount 30 ~ 50L/min, forbids when not adding sleeve pipe to add insulating covering agent to Zhong Bao impact zone.Open bag argon filling in before watering.Tundish selects high alkalinity insulating covering agent; Crystallizer protecting residue selects the high carbon steel mould flux of low viscosity, good heat insulating, avoids slag entrapment in mold.
-crystallizer discharge 120 ~ 130m
3/ h, Spraying Water of Nozzles in Secondary Cooling curve selects 0.75L/kg steel specific water.Ingot-guiding head opens M-EMS after going out crystallizer, and last stove stopper stops watering rear stopping induction stirring.M-EMS parameter: 380A, 4Hz.Keep senior middle school's bag liquid level cast, liquid level 700mm in process, keeps liquid level stabilizing.The minimum middle bag liquid level of strict implement is not less than 400mm.Open and water first base with last base crop, tail according to 2.0 meters of length.Connect water to adopt when stopping watering first stop to water after pluck sleeve pipe, forbid naked watering.
Accompanying drawing explanation
Fig. 1 is certain factory different steps SWRH82B timeliness data.
Fig. 2 is wire drawing splitting photo.
Fig. 3 is wire drawing transverse fissure photo figure.
Embodiment
The present invention can implement in Steel Complex, and here is Shougang Changzhi Iron & Steel Co., Ltd.'s steelworks, adopts the example that this invention is produced.
Operational path is: high-quality molten iron → LD (80 tons) converter smelting → converter slag-resisting tapping → ladle deoxidation alloying → LF (80 tons) ladle refining furnace → feed Si-Ca line → steel ladle bottom argon blowing soft blow → 150mm × 150mm billet caster → strand.
LD converter smelting main technologic parameters:
Volume after laying bricks: 58.5m3; Volumetric ratio [V/T]: 0.83; Tap hole diameter [in D]: 150mm; Tap hole angle: 10 ° of nozzle types: four Lavalles, hole; Throat diameter: 31.86mm; Exit diameter: 41.05mm; Spray orifice and oxygen rifle centerlines: 12 ° 40 '; Mach number: 1.98; Oxygen operating pressure is 0.75 ~ 0.95MPa; Oxygen flow: 13000 ~ 16000m3/h; Ladle material: adopt Al2O3MgOC Bricks and spinel pouring material.
LF ladle refining furnace main technologic parameters:
Adopt one piece of bottom-blown air brick, carry out bottom blowing refining (all using argon gas).Ladle baking: adopt heat-accumulating baking device (use coke-oven gas).Rectification systems: on-line argon-blow and line feeding after stove; 80 tons of double-station LF ladle refining furnaces, heating efficiency 3 ~ 5 DEG C/min, power 14MVA.
Continuous casting main technologic parameters:
5 machines 5 flow billet caster elementary arc radius: R10m; Cast section: 150mm × 150mm; Specified length: 3.8 ~ 12m.Section: 150mm × 150mm.Pulling rate: 1.5 ~ 3m/min, average 2.5m/min.Crystallizer: copper pipe length 1000mm.Mold oscillation pattern: sinusoidal vibration.Frequency: 60 ~ 240 beats/min.Amplitude ± 5mm.Automatic liquid surface control mode: Ce137 radioactive source.Accuracy of detection: ± 3mm.Crystallizer discharge: 160m3/h.Induction stirring specifications parameter: magnetic stirrer rated current: 350A; Voltage rating: 380V.Applied power: 230KVA wattful power: 40KW (max) frequency: 2 ~ 8Hz (6Hz).Insulation level: H level.Crystallizer discharge: 150m3/h.Infrared cut-to-length control system: detect specified length 9 ~ 12m; Dummy bar form: flexible chain dumming bar.
Embodiment 1: heat (batch) number 6A201382
Converter smelting:
Molten iron condition C: 4.25%, Si:0.56%, Mn:0.51%, P:0.12%, S:0.022%, temperature: 1318 DEG C.
Burden structure: molten iron add-on 68.4 tons, steel scrap 4.4 tons.
Head batch dephosphorized slag consumption: lime 850kg, light dolomite 1099kg; Ore deposit 1900kg difficult to understand; Oxygen-consumption 880m
3/ N; Duration of blast: 238 seconds; Half steel temperature: 1320 DEG C.Half steel slag specimen: CaO:42.09%, SiO
2: 21.46%, TFe:11.71%, R:1.96.Converter terminal: C:0.14%, P:0.014%, S:0.018%.Terminal slag specimen: CaO:46.43%, SiO
2: 13.44%, TFe:17.82%, R:3.46.Tapping temperature 1610 DEG C.21 seconds tapping time 5 points, 34mm after slag.Deoxidation alloying: micro-nitrogen carburelant 6kg/ ton steel; Si-Ca-Ba 2kg/ ton steel; Ferromanganese 450kg, ferrosilicon 150kg, carbon ferrochrome 110kg.
LF ladle refining furnace:
Lime 910kg; Refining slag 112kg; Submerged arc slag 145kg; Fluorite 180kg; Bauxitic clay 100kg; Ferrosilicon powder 100kg; Silicon-calcium wire 1m/ ton steel; Soft argon blowing rate 65NL/min, 30 seconds time 12 points; Refining terminates departures a [o]: 9.8ppm.
Continuous casting process:
M-EMS parameter: 380A, 4Hz; Crystallizer discharge 120t/h, cooling twice selects 0.75L/kg specific water; Middle bag molten steel overheat 25 DEG C; Pulling rate 1.80m/min.
The each station carbon of SWRH82B, nitrogen content change: converter (C:0.15%; N:0.0016%) → enter LF stove (C:0.65%; N:0.0017%) → go out LF stove (C:0.75%; N:0.002%) → middle bag (C:0.76%; N:0.0021%) → stocking (C:0.76%; N:0.0022%).
Embodiment 2: heat (batch) number 6A201383
Converter smelting:
Molten iron condition C: 4.15%, Si:0.43%, Mn:0.36%, P:0.129%, S:0.011%, temperature: 1288 DEG C.
Burden structure: molten iron add-on 69.1 tons, steel scrap 5.1 tons.
Head batch dephosphorized slag consumption: lime 1800kg, light dolomite 475kg; Ore deposit 807kg difficult to understand; Oxygen-consumption 900m
3/ N; Duration of blast: 242 seconds; Half steel temperature: 1399 DEG C.Half steel slag specimen: CaO:47.50%, SiO
2: 20.41%, TFe:11.05%, R:2.31.Converter terminal: C:0.16%, P:0.012%, S:0.015%.Terminal slag specimen: CaO:52.53%, SiO
2: 14.94%, TFe:13.42%, R:3.52.Tapping temperature 1612 DEG C.25 seconds tapping time 5 points, 30mm after slag.Deoxidation alloying: micro-nitrogen carburelant 6kg/ ton steel; Si-Ca-Ba 2kg/ ton steel; Ferromanganese 440kg, ferrosilicon 155kg, carbon ferrochrome 115kg.
LF ladle refining furnace:
Lime 912kg; Refining slag 110kg; Submerged arc slag 135kg; Fluorite 150kg; Bauxitic clay 110kg; Ferrosilicon powder 90kg; Silicon-calcium wire 1m/ ton steel; Soft argon blowing rate 60NL/min, 45 seconds time 11 points; Refining terminates departures a [o]: 7.8ppm.
Continuous casting process:
M-EMS parameter: 380A, 4Hz; Crystallizer discharge 120t/h, cooling twice selects 0.75L/kg specific water; Middle bag molten steel overheat 29 DEG C; Pulling rate 1.82m/min.
The each station nitrogen content change of SWRH82B: converter (C:0.16%; N:0.0018%) → enter LF stove (C:0.67%; N:0.0020%) → go out LF stove (C:0.77%; N:0.0022%) → middle bag (C:0.77%; N:0.0016%) → stocking (C:0.77%; N:0.0025%).
Embodiment 3: heat (batch) number 6A201384
Converter smelting:
Molten iron condition C: 4.23%, Si:0.56%, Mn:0.51%, P:0.12%, S:0.025%, temperature: 1320 DEG C.
Burden structure: molten iron add-on 68.4 tons, steel scrap 4.4 tons.
Head batch dephosphorized slag consumption: lime 850kg, light dolomite 1099kg; Ore deposit 1900kg difficult to understand; Oxygen-consumption 880m
3/ N; Duration of blast: 238 seconds; Half steel temperature: 1320 DEG C.Half steel slag specimen: CaO:44.66%, SiO
2: 20.16%, TFe:13.36%, R:2.22.Converter terminal: C:0.15%, P:0.012%, S:0.018%.Terminal slag specimen: CaO:48.78%, SiO
2: 15.22%, TFe:13.01%, R:3.21.Tapping temperature 1615 DEG C.09 second tapping time 5 points, 39mm after slag.Deoxidation alloying: micro-nitrogen carburelant 6kg/ ton steel; Si-Ca-Ba 2kg/ ton steel; Ferromanganese 450kg, ferrosilicon 150kg, carbon ferrochrome 110kg.
LF ladle refining furnace:
Lime 880kg; Refining slag 1102kg; Submerged arc slag 150kg; Fluorite 170kg; Bauxitic clay 110kg; Ferrosilicon powder 120kg; Silicon-calcium wire 1m/ ton steel; Soft argon blowing rate 66NL/min, 23 seconds time 11 points.
Continuous casting process:
M-EMS parameter: 380A, 4Hz; Crystallizer discharge 120t/h, cooling twice selects 0.75L/kg specific water; Middle bag molten steel overheat 25 DEG C; Pulling rate 1.81m/min.
The each station nitrogen content change of SWRH82B: converter (C:0.15%; N:0.0022%) → enter LF stove (C:0.70%; N:0.0025%) → go out LF stove (C:0.78%; N:0.0026%) → middle bag (C:0.80%; N:0.0028%) → stocking (C:0.81%; N:0.0030%).
Embodiment 4: heat (batch) number 6A201385
Converter smelting:
Molten iron condition C: 4.2%, Si:0.56%, Mn:0.51%, P:0.12%, S:0.022%, temperature: 1318 DEG C.
Burden structure: molten iron add-on 68.4 tons, steel scrap 4.4 tons.
Head batch dephosphorized slag consumption: lime 850kg, light dolomite 1099kg; Ore deposit 1810kg difficult to understand; Oxygen-consumption 870m
3/ N; Duration of blast: 238 seconds; Half steel temperature: 1320 DEG C.Half steel slag specimen: CaO:42.09%, SiO
2: 21.46%, TFe:11.71%, R:1.96.Converter terminal: C:0.14%, P:0.014%, S:0.018%.Terminal slag specimen: CaO:46.43%, SiO
2: 13.44%, TFe:17.82%, R:3.46.Tapping temperature 1618 DEG C.21 seconds tapping time 5 points, 34mm after slag.Deoxidation alloying: micro-nitrogen carburelant 6kg/ ton steel; Si-Ca-Ba 2kg/ ton steel; Ferromanganese 450kg, ferrosilicon 150kg, carbon ferrochrome 110kg.
LF ladle refining furnace:
Lime 910kg; Refining slag 112kg; Submerged arc slag 145kg; Fluorite 180kg; Bauxitic clay 100kg; Ferrosilicon powder 100kg; Silicon-calcium wire 1m/ ton steel; Soft argon blowing rate 65NL/min, 30 seconds time 12 points.
Continuous casting process:
M-EMS parameter: 380A, 4Hz; Crystallizer discharge 120t/h, cooling twice selects 0.75L/kg specific water; Middle bag molten steel overheat 35 DEG C; Pulling rate 1.85m/min.
The each station nitrogen content change of SWRH82B: converter (C:0.14%; N:0.0023%) → enter LF stove (C:0.74%; N:0.0026%) → go out LF stove (C:0.81%; N:0.0028%) → middle bag (C:0.83%; N:0.0030%) → stocking (C:0.83%; N:0.0033%).
Claims (1)
1. produce a method for high-carbon low nitrogen twisted wire steel, technique comprises: desulfurizing iron skims → and converter smelting → slag-stopping tapping → ladle deoxidation and alloying → ladle slag upgrading → LF ladle refining → feed Si-Ca line → steel ladle bottom argon blowing soft blow → 150mm × 150mm small billet full guard casting → M-EMS; It is characterized in that, the technical parameter controlled in technique is as follows:
Converter adopts 80 tons of primary converter double-slag operations, and end point carbon controls by 0.15%, tapping temperature 1610 ~ 1620 DEG C, slag-stopping tapping, and the slag thickness in control converter tapping process is between 0 ~ 40mm; Micro-nitrogen carburelant: N:0.005 ~ 0.025%, joins carbon 6kg/ ton steel, uses Si-Ca-Ba deoxidation, add-on 2.0kg/ ton steel, 4.5kg/ ton steel synthetic slag;
LF (80 tons) refining furnace slag material uses synthetic slag, quickened lime: CaO+MgO:96.5 ~ 98%, SiO
2: 1 ~ 1.5%, CO
2: 1 ~ 2.0%, activity degree >350ml, the test condition of activity: 4mol/ml-HCl, temperature 40 ± 1 DEG C, 10min; Aluminium vanadine: Al
2o
3: 75 ~ 97%, SiO
2: 0 ~ 10%, CaO:1 ~ 5%, MgO:2 ~ 9.5%, H
2o:0 ~ 0.5%; Fluorite: CaF
2: 85.44 ~ 99%, SiO
2: 1 ~ 14%, S:0 ~ 0.5%, P:0 ~ 0.06%, the quantity of slag is by 1 ~ 1.2 ton of control, and aluminium vanadine controls at 80 ~ 100Kg, and the top of the slag adds Fe-Si powder and calcium carbide deoxidation, form white slag and finishing slag TFe<1.0% in power supply in 15min minute, reduce a in steel
[o], S content; Ca-Si line 1m/ ton steel is fed, soft blow argon after line feeding, flow 40 ~ 60L/min at the end of the process of LF stove, time>=10min, slightly spring up not exposed steel with the top of the slag and be advisable, make to be mingled with abundant floating in steel, refining treatment finishes target a [o]: 0 ~ 10ppm;
Adopt 150mm × 150mm continuous small-billet casting, crystallizer adopts the induction stirring of 380A, 4Hz, adopt the large covering agent of high alkalinity, large bag argon envelope, the omnidistance Argon of tundish, the casting of submerged nozzle full guard, cast is according to 1.8 ~ 2.0m/min casting speed control, Metal in Tundish superheating temperature controls at 25 ~ 35 DEG C, and continuous casting two cold adopts 0.75L/Kg specific water to pour into a mould; Use Mg-Ca matter dry type material strip barricade tundish, full guard is poured into a mould, large bag argon envelope protective casing argon flow amount 30 ~ 50L/min, and forbid when not adding sleeve pipe to add insulating covering agent to Zhong Bao impact zone, open and water front tundish argon filling, tundish selects high alkalinity insulating covering agent; The special high carbon steel covering slag of crystallizer low viscosity high alkalinity: viscosity: 1300 DEG C, 4 ~ 6 pools; CaO/SiO
2basicity: 0.80 ~ 1.1, crystallizer discharge 120 ~ 130m
3/ h, Spraying Water of Nozzles in Secondary Cooling curve selects 0.75L/kg steel specific water; Ingot-guiding head opens M-EMS after going out crystallizer, and last stove stopper stops watering rear stopping induction stirring; Keep senior middle school's bag liquid level cast, liquid level 700mm in process, keeps liquid level stabilizing; Perform minimum middle bag liquid level to be not less than 400mm and to carry out cast system, open and water first base and last base crop, tail excise according to 2.0 meters of length.Connect and water when stopping watering, adopt after first stopping to water and pluck sleeve pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410838487.0A CN104498805B (en) | 2014-12-29 | 2014-12-29 | Production method of high-carbon low-nitrogen steel for strand wires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410838487.0A CN104498805B (en) | 2014-12-29 | 2014-12-29 | Production method of high-carbon low-nitrogen steel for strand wires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104498805A true CN104498805A (en) | 2015-04-08 |
| CN104498805B CN104498805B (en) | 2017-01-25 |
Family
ID=52940255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410838487.0A Active CN104498805B (en) | 2014-12-29 | 2014-12-29 | Production method of high-carbon low-nitrogen steel for strand wires |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104498805B (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002424A (en) * | 2015-07-31 | 2015-10-28 | 河北钢铁股份有限公司承德分公司 | Continuous casting method for high-carbon low-nitrogen steel |
| CN105127386A (en) * | 2015-08-19 | 2015-12-09 | 河北钢铁股份有限公司 | Continuous casting method for controlling center carbon segregation of small high-carbon hard-wire steel square billet |
| CN106735025A (en) * | 2017-02-09 | 2017-05-31 | 首钢总公司 | A kind of control method of prestress steel continuous small-billet casting center segregation |
| CN107236894A (en) * | 2017-06-16 | 2017-10-10 | 马鞍山钢铁股份有限公司 | A kind of method for making steel of low-sulfur, low titanium Aluminum steel |
| CN107385139A (en) * | 2017-07-30 | 2017-11-24 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of high-carbon steel |
| CN108251598A (en) * | 2018-01-12 | 2018-07-06 | 唐山钢铁集团有限责任公司 | A kind of carburetting control nitrogen production process of middle carbon high-alloy steel |
| CN108913844A (en) * | 2018-08-02 | 2018-11-30 | 本钢板材股份有限公司 | The control nitrogen technique of twisted wire steel steel series |
| CN109943683A (en) * | 2019-03-06 | 2019-06-28 | 鞍钢股份有限公司 | A kind of small billet produces refining and the continuous cast method of Alloy Cold Heading Steel |
| CN110923401A (en) * | 2019-12-17 | 2020-03-27 | 芜湖新兴铸管有限责任公司 | Method for controlling carbon segregation of high-carbon steel |
| CN111020107A (en) * | 2019-12-17 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Method for controlling carbon segregation of high-carbon steel |
| CN111471831A (en) * | 2020-05-18 | 2020-07-31 | 芜湖新兴铸管有限责任公司 | Ternary refining slag for high-carbon stranded wire steel, high-carbon stranded wire steel and slagging method thereof |
| CN112317706A (en) * | 2020-09-11 | 2021-02-05 | 南京钢铁股份有限公司 | Argon protection pouring operation method for continuous casting tundish |
| CN114082913A (en) * | 2021-11-15 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Control method for improving center carbon segregation of hypereutectoid steel produced by small square billet section |
| EP4019658A4 (en) * | 2019-09-26 | 2022-07-20 | Institute Of Research Of Iron And Steel, Jiangsu Province/Sha-Steel, Co. Ltd (CN) | Wire rod for ultrahigh-strength steel cord and manufacturing method therefor |
| CN114774619A (en) * | 2022-04-29 | 2022-07-22 | 中国铁建重工集团股份有限公司 | Low-nitrogen high-carbon chromium bearing steel and production method thereof |
| CN115369207A (en) * | 2022-09-06 | 2022-11-22 | 重庆钢铁股份有限公司 | Method for controlling nitrogen content of non-vacuum smelting plate blank |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5650027A (en) * | 1993-05-25 | 1997-07-22 | Nippon Steel Corporation | High-carbon steel wire rod and wire excellent in drawability and methods of producing the same |
| CN1778484A (en) * | 2004-11-17 | 2006-05-31 | 首钢总公司 | Continuous-casting and rolling manufacture for 82B wire rod steel strand |
| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
| CN102534094A (en) * | 2012-01-01 | 2012-07-04 | 首钢总公司 | Method for producing tire cord steel wire by converter billet continuous casting process |
| CN103103307A (en) * | 2013-01-24 | 2013-05-15 | 首钢总公司 | Method for producing steel for low-nitrogen stranded wire by use of non-vacuum process of converter |
-
2014
- 2014-12-29 CN CN201410838487.0A patent/CN104498805B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5650027A (en) * | 1993-05-25 | 1997-07-22 | Nippon Steel Corporation | High-carbon steel wire rod and wire excellent in drawability and methods of producing the same |
| CN1778484A (en) * | 2004-11-17 | 2006-05-31 | 首钢总公司 | Continuous-casting and rolling manufacture for 82B wire rod steel strand |
| CN101597713A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | A kind of microalloying SWRH87B gren rod and manufacture method thereof |
| CN102534094A (en) * | 2012-01-01 | 2012-07-04 | 首钢总公司 | Method for producing tire cord steel wire by converter billet continuous casting process |
| CN103103307A (en) * | 2013-01-24 | 2013-05-15 | 首钢总公司 | Method for producing steel for low-nitrogen stranded wire by use of non-vacuum process of converter |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002424A (en) * | 2015-07-31 | 2015-10-28 | 河北钢铁股份有限公司承德分公司 | Continuous casting method for high-carbon low-nitrogen steel |
| CN105127386A (en) * | 2015-08-19 | 2015-12-09 | 河北钢铁股份有限公司 | Continuous casting method for controlling center carbon segregation of small high-carbon hard-wire steel square billet |
| CN106735025A (en) * | 2017-02-09 | 2017-05-31 | 首钢总公司 | A kind of control method of prestress steel continuous small-billet casting center segregation |
| CN107236894A (en) * | 2017-06-16 | 2017-10-10 | 马鞍山钢铁股份有限公司 | A kind of method for making steel of low-sulfur, low titanium Aluminum steel |
| CN107236894B (en) * | 2017-06-16 | 2019-03-15 | 马鞍山钢铁股份有限公司 | A kind of method for making steel of low-sulfur, low titanium Aluminum steel |
| CN107385139A (en) * | 2017-07-30 | 2017-11-24 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of high-carbon steel |
| CN108251598B (en) * | 2018-01-12 | 2020-05-05 | 唐山钢铁集团有限责任公司 | Carbon increasing and nitrogen controlling production method of medium-carbon high-alloy steel |
| CN108251598A (en) * | 2018-01-12 | 2018-07-06 | 唐山钢铁集团有限责任公司 | A kind of carburetting control nitrogen production process of middle carbon high-alloy steel |
| CN108913844A (en) * | 2018-08-02 | 2018-11-30 | 本钢板材股份有限公司 | The control nitrogen technique of twisted wire steel steel series |
| CN109943683A (en) * | 2019-03-06 | 2019-06-28 | 鞍钢股份有限公司 | A kind of small billet produces refining and the continuous cast method of Alloy Cold Heading Steel |
| EP4019658A4 (en) * | 2019-09-26 | 2022-07-20 | Institute Of Research Of Iron And Steel, Jiangsu Province/Sha-Steel, Co. Ltd (CN) | Wire rod for ultrahigh-strength steel cord and manufacturing method therefor |
| CN111020107A (en) * | 2019-12-17 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Method for controlling carbon segregation of high-carbon steel |
| CN110923401A (en) * | 2019-12-17 | 2020-03-27 | 芜湖新兴铸管有限责任公司 | Method for controlling carbon segregation of high-carbon steel |
| CN111471831A (en) * | 2020-05-18 | 2020-07-31 | 芜湖新兴铸管有限责任公司 | Ternary refining slag for high-carbon stranded wire steel, high-carbon stranded wire steel and slagging method thereof |
| CN112317706A (en) * | 2020-09-11 | 2021-02-05 | 南京钢铁股份有限公司 | Argon protection pouring operation method for continuous casting tundish |
| CN114082913A (en) * | 2021-11-15 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Control method for improving center carbon segregation of hypereutectoid steel produced by small square billet section |
| CN114082913B (en) * | 2021-11-15 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Control method for improving center carbon segregation of hypereutectoid steel produced by small square billet section |
| CN114774619A (en) * | 2022-04-29 | 2022-07-22 | 中国铁建重工集团股份有限公司 | Low-nitrogen high-carbon chromium bearing steel and production method thereof |
| CN114774619B (en) * | 2022-04-29 | 2023-10-24 | 中国铁建重工集团股份有限公司 | Low-nitrogen high-carbon chromium bearing steel and production method thereof |
| CN115369207A (en) * | 2022-09-06 | 2022-11-22 | 重庆钢铁股份有限公司 | Method for controlling nitrogen content of non-vacuum smelting plate blank |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104498805B (en) | 2017-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104498805B (en) | Production method of high-carbon low-nitrogen steel for strand wires | |
| CN110004366B (en) | Aluminum-containing low-carbon building steel and smelting process thereof | |
| CN100354562C (en) | High alloy steel seamless steel pipe and production method thereof | |
| CN103103307B (en) | Method for producing steel for low-nitrogen stranded wire by use of non-vacuum process of converter | |
| CN102212749B (en) | Method for producing steel for high-efficiency alloy welding wires through continuous billet casting | |
| CN103834848B (en) | A kind of boracic compressor wire and steel strand steel and smelting technology thereof | |
| CN104789859B (en) | Method for producing peritectic steel by using medium-thin slab continuous caster | |
| CN104278197B (en) | Smelting method of steel for low-silicon high-titanium welding wire | |
| CN104862443A (en) | Smelting method for low-carbon low-silicon wire-welding steel | |
| CN104694819A (en) | Production method for low-carbon low-silicon steel | |
| CN105316558B (en) | Preparation method of boron-containing steel preventing casting blank corner cracking | |
| CN104498818A (en) | ER70S-6 hot rolled wire rod and preparation method thereof | |
| CN113061688B (en) | SWRH82B high-carbon steel wire and preparation method thereof | |
| CN102851579A (en) | Nb-containing micro-alloyed high-carbon steel hot-rolled wire rod and manufacturing method thereof | |
| CN110340315B (en) | Method for continuously casting martensitic stainless steel by using large-section rectangular billet | |
| CN102312054A (en) | Ladle furnace low alkalinity slag refining process | |
| CN102747269A (en) | Low-silicon aluminum-containing steel and production method thereof | |
| CN103334050A (en) | Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel | |
| CN100343397C (en) | Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster | |
| CN102851447B (en) | Outside-furnace refining production method of steel used in carbon steel welding wire | |
| CN105154623A (en) | Efficient alloying method for smelting 38CrMoAl steel | |
| CN103667581A (en) | Low-nitrogen SWR82B steel smelting method | |
| CN105483501A (en) | Method for smelting phosphorus-containing ultra-low carbon steel | |
| CN105603145A (en) | Method for rectangular continuous casting production of low-carbon low-silicon steel | |
| CN107794340A (en) | A kind of method for controlling low-carbon Al killed cold heading steel Concasting Bloom crackle |
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 | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |