CN104498805B - 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
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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, the production method of the low nitrogen twisted wire steel of more particularly to a kind of high-carbon, adopt
It is low that the antivacuum flow process of primary converter (80 tons)+lf (80 tons) refining furnace+small billet (150mm × 150mm) continuous casting produces high-carbon
Nitrogen steel it is adaptable to converter, lf stove, continuous small-billet casting adopting non-vacuum process produce 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 bigger, and the plasticity index of steel is poorer, and the time gets over
Long.Nitrogen in steel under specified conditions can reduce the performance of material, and its presence reduces the toughness of steel and moulding.So that steel is produced should
Become timeliness, aging precipitation and aged brittleness.It was verified that the nitrogen in steel controls in different levels, the plasticity to steel and timeliness
Time effects are very big.Certain factory (accompanying drawing 1) produces the different control process of the nitrogen that high-carbon steel swrh82b is experienced: nitrogen in steel control
Between 55～90ppm, average content is 65ppm to system.The same day offline reduction of area is maintained at 0～12.5%, wire rod fracture base
It is the fracture apperance that rock-candy structure or center portion only have small plastic deformation in basis；The reduction of area of 10 days is 21.6%；15 days
Reduction of area 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 same day offline reduction of area is maintained at 10～
14.5%, wire rod fracture substantially center portion only has the fracture apperance of small plastic deformation；The reduction of area of 10 days is 29.2%；15 days
Reduction of area be 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 same day offline reduction of area is 17.5%, and normal fracture is plastic 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 to fluctuate between 37.3～37.9%, reduction of area ripple
Dynamic very little.Nitrogen in steel controls between 20～32ppm, and average content is 27ppm.The same day offline reduction of area is 26%, 2 days
Reduction of area is 30%；The reduction of area of 5 days is 35%；The reduction of area of 6～30 days fluctuates 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 steel
In Control of Nitrogen Content more low better the reason, this is related to a production process cost and economical efficiency.
At present, high-carbon, the main side of low nitrogen steel (60si2mn, gcr15, swrh77b and swrh82b) are produced in the world
Formula is: molten iron pretreatment → converter smelting+lf (+rh) refine → molding (big cross section continuous casting square billet) → secondary cogging → high-speed line
Material controlled rolling → stelmor strength cools down.This is current Japan, European most widely used mode, the such as Sang Deweike of Sweden
Factory's casting blank section is 265mm × 365mm, and Belgian arbed casting machine section is 260mm × 260mm, the roechljng factory of Germany
Casting machine section is 240mm × 240mm, Di Sen ruhrort factory casting machine section 260mm × 330mm, and the casting machine section of Nippon Steel is
220mm×220mm.Baosteel adopts die casting process, just shuts out 130mm × 130mm～160mm by molding base (big cross section continuous casting billet)
The semifinished product of × 160mm.Xing Gang rolls into 150mm × 150mm using 280mm × 325mm rectangular bloom cogging, and its technological advantage is:
Meet to big degree the manufacturing requirementss of steel strand wires steel swrh82b wire rod: Cleanliness of Molten Steel degree is good, deoxidation removes and is mingled with
Thing is fully (as Nippon Steel, Baosteel product: t [o] < 20ppm；[n] < 60ppm), post bake cogging avoid the center of continuous casting billet
The harm of segregation and shrinkage cavity, surface quality are good, compression ratio is big.Shortcoming is complex procedures, lumber recovery is low, production cost is high, the energy
Consume pollute greatly more.
For reducing production cost, domestic each iron and steel enterprise, when smelting steel strand wires with steel swrh82b, generally eliminates vacuum
Degasser, nitrogen in steel, hydrogen body burden are higher.At present, the nitrogen normal level in domestic swrh82b steel is in 50～70ppm, same
When in the operation of rolling, due to imposed deformation, force cooling and phase transformation, there is substantial amounts of residual stress in just offline wire rod
(rolling stress, temperature stress, transformation stress).
Release due to gas and residual stress requires time for, and this just leads to swrh82b wire rod to use front needs in user
Carry out Ageing Treatment.Nitrogen main harm in swrh82b shows as forming with corner angle the crisp folder of property with the element such as titanium, aluminum in steel
Debris, after a certain amount of plastic deformation, inside small cavity first, and with the increase of deflection, empty quantity increases
Adduction is mutually polymerized, and ultimately results in Materials Fracture.Compared with plastic occluded foreignsubstance, nitride forms brittle inclusion and is more easy to become high
The origin of ductile fracture in the carbon steel cold-drawn course of processing.
Most enterprises producing high-carbon steel are limited by existing smelting equipment, cause the change of swrh77b, swrh82b steel
Study point unstable, the degree of purity of steel is low.Particularly nitrogen in steel content fluctuation range fluctuates the upper limit, even super from standard min
Mark, during causing the drawing of wire drawing and twisting, wire broken rate is higher, and typical case is due to the higher fracture apperance causing of nitrogen in steel content
See accompanying drawing 2,3.So, after causing product enterprise drawing, the index fluctuation range such as product strength, toughness is big, and product qualified rate is low；
On the other hand easily in drawing, cause brittle failure, cannot process when serious.
Content of the invention
Present invention aim at providing a kind of production method of high-carbon low nitrogen twisted wire steel, using primary converter (80 tons)+lf
The antivacuum flow process of (80 tons) refining furnace+small billet (150mm × 150mm) continuous casting produces high-carbon low nitrogen steel method, is suitable for
Produce high-carbon, low nitrogen steel twisted wire steel (carbon content 0.75～0.83% in converter, lf stove, continuous small-billet casting adopting non-vacuum process；Nitrogen
Content 20～40ppm)；Join carbon including molten iron → converter smelting → slag-stopping tapping → ladle, deoxidation and alloying → ladle slag changes
Matter → lf ladle refining → feed si-ca line → steel ladle bottom argon blowing soft blow → 150mm × 150mm small billet full guard casting → crystallization
Device electromagnetic agitation → heating → controlled rolling → control cooling.It is applied to high-grade building prestressed concrete field.
The steel strand wires steel being produced using the present invention, nitrogen in steel controls within 40ppm, reach vacuum degassing process,
Bloom continuous casting two fire is become a useful person the steel strand wires steel quality level of technique productions, steel making working procedure production cost is greatly lowered, increases
Plus Competitive Products, there is larger economic benefit and social benefit.
The technical parameter controlling in technique is as follows:
Converter adopts 80 tons of primary converter double slag operations, and aim carbon presses 0.15% control, 1610～1620 DEG C of tapping temperature, gear
Slag is tapped, and controls the slag thickness in converter tapping process between 0～40mm；Micro- nitrogen carburant: n:0.005～0.025%,
Join carbon 6kg/ ton steel, use si-ca-ba deoxidation, addition 2.0kg/ ton steel, 4.5kg/ ton steel synthetic slag；
Lf (80 tons) refining furnace slag material uses synthetic slag, active lime: (cao+mgo): 96.5～98%, sio2: 1～
1.5%, co2: 1～2.0%, activity degree (4mol/ml-hcl, 40 ± 1 DEG C of temperature, 10min) > 350ml；Aluminum vanadine: al2o3: 75
～97%, sio2: 0～10%；Cao:1～5%, mgo:2～9.5%, h2O:0～0.5%；Fluorite: caf2: 85.44～
99%, sio2: 1～14%, s:0～0.5%, p:0～0.06%, total quantity of slag controls according to 1.0～1.2 tons, and aluminum vanadine controls
Within 80～100kg, the top of the slag adds fe-si powder and carbide deoxidation, formed in power supply 15min minute white slag and finishing slag tfe <
1.0%, reduce a [o], s content in steel；Lf stove feeds ca-si line 1m/ ton steel, soft blow argon after line feeding, flow 40 at the end of processing
～60l/min, the time >=10min, slightly springs up not exposed steel with the top of the slag and is advisable, and makes to be mingled with abundant floating, refining treatment in steel
Complete target a [o]: 0～10ppm.
Using 150mm × 150mm continuous small-billet casting, crystallizer adopts the electromagnetic agitation of 380a, 4hz, big using high alkalinity
Covering agent, big bag argon envelope, tundish whole process Argon, the casting of submersed nozzle full guard, cast is permanent according to 1.8～2.0m/min
Casting speed control, the Metal in Tundish degree of superheat controls at 25～35 DEG C, and continuous casting two cold is poured into a mould using 0.75l/kg specific water；Make
With mg-ca matter dry type material strip barricade tundish, full guard cast, big bag argon envelope protects sleeve pipe argon flow amount 30～50l/min, not
Plus forbid during sleeve pipe to add coverture to middle bag impact zone, open and pour front tundish argon filling, tundish selects high alkalinity coverture；Knot
Brilliant device covering slag low viscosity high alkalinity special (viscosity: 1300 DEG C, 4～6 pools；Basicity (cao/sio2): 0.80～1.1) high-carbon steel
Covering slag, crystallizer discharge 120 ton hour, Spraying Water of Nozzles in Secondary Cooling curve selects 0.75l/kg steel specific water；Dummy bar head goes out knot
M-EMS is opened, last stove stopper stops electromagnetic agitation after stopping pouring after brilliant device；Keep senior middle school's bag liquid level cast, mistake
Liquid level 700mm in journey, keeps liquid level stabilizing；Execute minimum middle bag liquid level and be not less than 400mm and carry out cast system, open and pour first
Base and last base crop, tail are excised according to 2.0 meters of length.Company pours when stopping pouring, and plucks sleeve pipe using after first stopping to pour.
Converter adopts double slag operation, and head criticizes dephosphorized slag: oxygen consumption: 820～900m3/n；1380～1400 DEG C of half steel temperature,
Slag dual alkalinity r:2.0～2.5；Decarbonized slag: aim carbon is pressed 0.10～0.20% and controlled, 1610～1630 DEG C of tapping temperature,
Slag finishing slag dual alkalinity r:3.0～3.5；Slag-stopping tapping, controls slag thick between 0～40mm.
Using micro- nitrogen carburant (n:0.005～0.025%) 6kg/ ton steel carburetting, using calsibar alloy 2.0kg/ ton steel
Deoxidation, 4.5kg/ ton steel synthetic slag；Enter lf refine stand control oxygen activity 8～18ppm, refine finishing slag fe+mno≤1.0%；Hello
Ca-si line 1m/ ton steel carries out being mingled with degenerative treatments, and soft argon blowing time was at 10 minutes.
Adopt crystallizer to join electromagnetic agitation to reduce strand Central Carbon Segregation and shrinkage cavity, control the Metal in Tundish degree of superheat 25
～35 DEG C, using the casting of 1.80～2.0m/min pulling rate full guard, bis- specific waters of 0.75kg/l, the nitrogen content interval in steel is
0.0020～0.0033%, average out to 0.0027%, nitrogen controls horizontal exceeding molten iron pretreatment → converter smelting+lf (+rh) essence
The control level of refining → molding (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 modification →
Lf (80 tons) ladle refining (include temperature raising, alloy fine setting, desulfurization) → feed si-ca line → ladle blow soft blow argon → 150mm ×
The casting of 150mm billet caster full guard, M-EMS → strand inspection → heating → controlled rolling → control cooling.
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,
Head batch dephosphorized slag: oxygen consumption is according to 880m3/ n controls；1360～1400 DEG C of range restraint of half steel temperature, dephosphorization basicity of slag according to
2.0 controls, duration of blast controlled according to 240 seconds.Aim carbon presses 0.15% control, p≤0.015%, s≤0.020%, finishing slag alkali
Degree (cao/sio2)>3.0.Tapping temperature presses 1610～1630 DEG C of controls.The cooperation later stage slag retaining cone tapping of early stage skimming ball, controls
Ladle thickness of slag layer 0～40mm.
Stokehold is joined carbon and is adopted the micro- nitrogen carburant of 6kg/ ton steel (n:0.005～0.025%), and remainder is increased using common
Carbon agent polishing；Use si-ca-ba deoxidation, addition 2.0kg/t steel.Manganese is joined using mn-fe, si-fe joins silicon, absorbance according to
92% control.
The tapping time >=5min.Using slag-stopping tapping, converter slag slag thickness≤40mm in ladle；Binary is added during tapping
Synthetic slag 4kg/ ton steel synthetic slag；Tapping process whole process BOTTOM ARGON BLOWING (argon pressure must assure that between 1.0～1.1mpa).
Molten steel pre- blowing argon gas 3 minutes (flow 300～400nl/min) to after refining station, and situation is seethed according to liquid level
Suitably adjust.Slag material uses synthetic slag, active lime (cao+mgo:93～99%, activity degree (4mol/ml-hcl, temperature 40
± 1 DEG C, 10min) > 350ml), aluminum vanadine (al2o3: 75～95%；sio2: 0～10%)), fluorite (caf2: 90～98%；
sio2: 0～9%), the quantity of slag controls (aluminum vanadine add less control within 100kg) by 1.2 tons, and the top of the slag adds fe-si powder and carbide
Deoxidation, strives for forming white slag and finishing slag tfe < 1.0% in power supply 15min minute, reduces a in steel as far as possibleo, s content.Guarantee
Fast Slag Melting, various slag charges will add as early as possible.The adjustment of last batch of alloy finish Argon stirring >=5min (flow 300～
400nl/min), uniform to ensure alloying component.
Lf stove feeds ca-si line 1m/ ton steel stove at the end of processing, and carries out deformation processing of inclusion, soft blow argon after line feeding
(flow 40～60l/min) time must protect >=10min, slightly spring up not exposed steel with the top of the slag and be advisable, and makes to be mingled with steel on fully
Floating.Refining treatment finishes target a [o]: 0～10ppm.
150mm × 150mm continuous small-billet casting, crystallizer adopts the electromagnetic agitation of 380a, 4hz, using the big bag of high alkalinity
Coverture, big bag argon envelope, tundish whole process Argon, the casting of submersed nozzle full guard, cast is according to 1.80m/min pulling rate control
System, 25～35 DEG C of controls of the Metal in Tundish degree of superheat, continuous casting two cold is poured into a mould using 0.75l/kg specific water.
Big bag is using band ar envelope long nozzle, molding casting.Using mg-ca matter dry type material strip barricade tundish, full guard
Cast, big bag protection sleeve pipe argon flow amount 30～50l/min, forbids when uncased to add coverture to middle bag impact zone.Open
Bag argon filling in before pouring.Tundish selects high alkalinity coverture；Crystallizer protecting residue selects low viscosity, the high-carbon steel of good heat insulating
Mould flux, it is to avoid slag entrapment in mold.
Crystallizer discharge 120～130m3/ h, Spraying Water of Nozzles in Secondary Cooling curve selects 0.75l/kg steel specific water.Dummy ingot
Head opens M-EMS after going out crystallizer, and last stove stopper stops electromagnetic agitation after stopping pouring.M-EMS
Parameter: 380a, 4hz.Keep the cast of senior middle school bag liquid level, during liquid level 700mm, keep liquid level stabilizing.During strict implement is minimum
Bag liquid level is not less than 400mm.Open and pour first base and last base crop, tail according to 2.0 meters of length.Even pour and adopt when stopping pouring
Pluck sleeve pipe after first stopping to pour, forbid naked pouring.
Brief description
Fig. 1 is certain factory's different phase swrh82b timeliness data.
Fig. 2 cleaves photo for wire drawing.
Fig. 3 is wire drawing transverse fissure photo figure.
Specific embodiment
The present invention can be implemented in integrated iron and steel works, and Shougang Changzhi Iron ＆ Steel Co., Ltd. steel mill is presented herein below, employing this
The example that open-birth is produced.
Process route 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；Tapping hole diameter [in d]: 150mm；Tapping hole angle:
10 ° of nozzle types: four hole Lavalles；Throat diameter: 31.86mm；Outlet diameter: 41.05mm；Spray orifice and oxygen rifle center wire clamp
Angle: 12 ° 40 '；Mach number: 1.98；Oxygen operating pressure is 0.75～0.95mpa；Oxygen flow: 13000～16000m3/h；
Ladle material: using aluminium-magnesia carbon brick and spinel pouring material.
Lf ladle refining furnace main technologic parameters:
Using one piece of bottom-blown air brick, carry out bottom blowing refining (all using argon).Ladle baking: using heat accumulating type baking
Device (using coke-stove gas).Rectification systems: furnace rear on-line argon-blow and line feeding；80 tons of double lf ladle refining furnaces, heat energy
3～5 DEG C/min of power, power 14mva.
Continuous casting main technologic parameters:
5 machine 5 flows the basic arc radius of billet caster: r10m；Cast section: 150mm × 150mm；Cut lengths: 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 is put
Penetrate source.Accuracy of detection: ± 3mm.Crystallizer discharge: 160m3/h.Electromagnetic agitation specifications parameter: magnetic stirrer rated current:
350a；Rated voltage: 380v.Apparent energy: 230kva active power: 40kw (max) frequency: 2～8hz (6hz).Insulation etc.
Level: h level.Crystallizer discharge: 150m3/h.Infrared cut-to-length control system: detection cut lengths 9～12m；Dummy ingot rod type: scratch
Property 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: 68.4 tons of molten iron addition, 4.4 tons of steel scrap.
Head batch dephosphorized slag consumption: Calx 850kg, light dolomite 1099kg；Ore deposit 1900kg difficult to understand；Oxygen consumption 880m3/n；Blow
The refining time: 238 seconds；Half steel temperature: 1320 DEG C.Half steel slag specimen: cao:42.09%, sio2: 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%, sio2: 13.44%,
Tfe:17.82%, r:3.46.1610 DEG C of tapping temperature.21 seconds 5 points of tapping time, 34mm after slag.Deoxidation alloying: micro- nitrogen increases
Carbon agent 6kg/ ton steel；Si-Ca-Ba 2kg/ ton steel；Ferromanganese 450kg, ferrosilicon 150kg, carbon ferrochrome 110kg.
Lf ladle refining furnace:
Calx 910kg；Refining slag 112kg；Submerged arc slag 145kg；Fluorite 180kg；Bauxite 100kg；Ferrosilicon powder 100kg；
Silicon-calcium wire 1m/ ton steel；Soft argon blowing rate 65nl/min, 30 seconds 12 points of time；Refine terminates outbound a [o]: 9.8ppm.
Continuous casting process:
M-EMS parameter: 380a, 4hz；Crystallizer discharge 120t/h, cooling twice selects 0.75l/kg ratio
The water yield；25 DEG C of middle bag molten steel overheat；Pulling rate 1.80m/min.
Swrh82b each station carbon, 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%) → roll
Material (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: 69.1 tons of molten iron addition, 5.1 tons of steel scrap.
Head batch dephosphorized slag consumption: Calx 1800kg, light dolomite 475kg；Ore deposit 807kg difficult to understand；Oxygen consumption 900m3/n；Blow
The refining time: 242 seconds；Half steel temperature: 1399 DEG C.Half steel slag specimen: cao:47.50%, sio2: 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%, sio2: 14.94%,
Tfe:13.42%, r:3.52.1612 DEG C of tapping temperature.25 seconds 5 points of tapping time, 30mm after slag.Deoxidation alloying: micro- nitrogen increases
Carbon agent 6kg/ ton steel；Si-Ca-Ba 2kg/ ton steel；Ferromanganese 440kg, ferrosilicon 155kg, carbon ferrochrome 115kg.
Lf ladle refining furnace:
Calx 912kg；Refining slag 110kg；Submerged arc slag 135kg；Fluorite 150kg；Bauxite 110kg；Ferrosilicon powder 90kg；Silicon
Calcium line 1m/ ton steel；Soft argon blowing rate 60nl/min, 45 seconds 11 points of time；Refine terminates outbound a [o]: 7.8ppm.
Continuous casting process:
M-EMS parameter: 380a, 4hz；Crystallizer discharge 120t/h, cooling twice selects 0.75l/kg ratio
The water yield；29 DEG C of middle bag molten steel overheat；Pulling rate 1.82m/min.
Swrh82b each station nitrogen content changes: 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: 68.4 tons of molten iron addition, 4.4 tons of steel scrap.
Head batch dephosphorized slag consumption: Calx 850kg, light dolomite 1099kg；Ore deposit 1900kg difficult to understand；Oxygen consumption 880m3/n；Blow
The refining time: 238 seconds；Half steel temperature: 1320 DEG C.Half steel slag specimen: cao:44.66%, sio2: 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%, sio2: 15.22%,
Tfe:13.01%, r:3.21.1615 DEG C of tapping temperature.09 second 5 points of tapping time, 39mm after slag.Deoxidation alloying: micro- nitrogen increases
Carbon agent 6kg/ ton steel；Si-Ca-Ba 2kg/ ton steel；Ferromanganese 450kg, ferrosilicon 150kg, carbon ferrochrome 110kg.
Lf ladle refining furnace:
Calx 880kg；Refining slag 1102kg；Submerged arc slag 150kg；Fluorite 170kg；Bauxite 110kg；Ferrosilicon powder 120kg；
Silicon-calcium wire 1m/ ton steel；Soft argon blowing rate 66nl/min, 23 seconds 11 points of time.
Continuous casting process:
M-EMS parameter: 380a, 4hz；Crystallizer discharge 120t/h, cooling twice selects 0.75l/kg ratio
The water yield；25 DEG C of middle bag molten steel overheat；Pulling rate 1.81m/min.
Swrh82b each station nitrogen content changes: 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: 68.4 tons of molten iron addition, 4.4 tons of steel scrap.
Head batch dephosphorized slag consumption: Calx 850kg, light dolomite 1099kg；Ore deposit 1810kg difficult to understand；Oxygen consumption 870m3/n；Blow
The refining time: 238 seconds；Half steel temperature: 1320 DEG C.Half steel slag specimen: cao:42.09%, sio2: 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%, sio2: 13.44%,
Tfe:17.82%, r:3.46.1618 DEG C of tapping temperature.21 seconds 5 points of tapping time, 34mm after slag.Deoxidation alloying: micro- nitrogen increases
Carbon agent 6kg/ ton steel；Si-Ca-Ba 2kg/ ton steel；Ferromanganese 450kg, ferrosilicon 150kg, carbon ferrochrome 110kg.
Lf ladle refining furnace:
Calx 910kg；Refining slag 112kg；Submerged arc slag 145kg；Fluorite 180kg；Bauxite 100kg；Ferrosilicon powder 100kg；
Silicon-calcium wire 1m/ ton steel；Soft argon blowing rate 65nl/min, 30 seconds 12 points of time.
Continuous casting process:
M-EMS parameter: 380a, 4hz；Crystallizer discharge 120t/h, cooling twice selects 0.75l/kg ratio
The water yield；35 DEG C of middle bag molten steel overheat；Pulling rate 1.85m/min.
Swrh82b each station nitrogen content changes: 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. a kind of method producing high-carbon low nitrogen twisted wire steel, technique includes: and desulfurizing iron skims → and converter smelting → pushing off the slag goes out
Steel → ladle deoxidation and alloying → ladle slag modification → 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 controlling in technique
As follows:
Converter adopts 80 tons of primary converter double slag operations, and aim carbon presses 0.15% control, 1610～1620 DEG C of tapping temperature, and pushing off the slag goes out
Steel, controls the slag thickness in converter tapping process between 0～40mm；Micro- nitrogen carburant: n:0.005～0.025%, join carbon
6kg/ ton steel, uses si-ca-ba deoxidation, addition 2.0kg/ ton steel, 4.5kg/ ton steel synthetic slag；
80 tons of lf refining furnace slag materials use synthetic slag, active lime: cao+mgo:96.5～98%, sio2: 1～1.5%,
co2: 1～2.0%, activity degree > 350ml, the test condition of activity: 4mol/ml-hcl, 40 ± 1 DEG C of temperature, 10min；Aluminum vanadium
Soil: al2o3: 75～97%, sio2: 0～10%, cao:1～5%, mgo:2～9.5%, h2O:0～0.5%；Fluorite: caf2:
85.44～99%, sio2: 1～14%, s:0～0.5%, p:0～0.06%, the quantity of slag presses 1～1.2 ton of control, and aluminum vanadine controls
In 80～100kg, the top of the slag adds fe-si powder and carbide deoxidation, forms white slag and finishing slag tfe < 1.0% in power supply in 15 minutes,
Reduce a in steel[o], s content；Lf stove feeds ca-si line 1m/ ton steel, soft blow argon after line feeding, flow 40～60l/ at the end of processing
Min, the time >=10min, slightly springs up not exposed steel with the top of the slag and is advisable, and makes to be mingled with abundant floating in steel, refining treatment finishes mesh
Mark a[o]: 0～10ppm；
Using 150mm × 150mm continuous small-billet casting, crystallizer adopts the electromagnetic agitation of 380a, 4hz, using the big cladding of high alkalinity
Lid agent, big bag argon envelope, tundish whole process Argon, the casting of submersed nozzle full guard, cast is according to 1.8～2.0m/min pulling rate control
System, the Metal in Tundish degree of superheat controls at 25～35 DEG C, and continuous casting two cold is poured into a mould using 0.75l/kg specific water；Using mg-
Ca matter dry type material strip barricade tundish, full guard is not poured into a mould, big bag argon envelope protection sleeve pipe argon flow amount 30～50l/min, not plus set
Forbid during pipe to add coverture to tundish impact area, open and pour front tundish argon filling, tundish selects high alkalinity coverture；Crystallization
Device low viscosity high alkalinity special high-carbon steel covering slag: viscosity: 1300 DEG C, 4～6 pools；cao/sio2Basicity: 0.80～1.1, crystallization
Device discharge 120～130m3/ h, Spraying Water of Nozzles in Secondary Cooling curve selects 0.75l/kg steel specific water；Dummy bar head is opened after going out crystallizer
Open M-EMS, last stove stopper stops electromagnetic agitation after stopping pouring；Keep the cast of high pouring basket liquid level, during liquid
Face 700mm, keeps liquid level stabilizing；Execute minimum pouring basket liquid level and be not less than 400mm and carry out cast system, open pour first base and
Last base crop, tail are excised according to 2.0 meters of length；Company pours when stopping pouring, and plucks sleeve pipe using after first stopping to pour.
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| 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 |
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| 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 |
| 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 |
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| 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 |
| 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 |
| 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 |
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| 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 |
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| CN102534094B (en) * | 2012-01-01 | 2013-05-22 | 首钢总公司 | Method for producing tire cord steel wire by converter billet continuous casting process |
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