CN106498116B - A kind of production technology of circle chain of mine steel - Google Patents
A kind of production technology of circle chain of mine steel Download PDFInfo
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- CN106498116B CN106498116B CN201610952185.5A CN201610952185A CN106498116B CN 106498116 B CN106498116 B CN 106498116B CN 201610952185 A CN201610952185 A CN 201610952185A CN 106498116 B CN106498116 B CN 106498116B
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-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/06—Product speed
-
- 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 discloses a kind of production technology of circle chain of mine steel, belong to vertical bar round-bar pass technical field, including converter smelting, the refining of LF stoves, billet continuous casting, steel rolling.The technical program realizes standardized production by above-mentioned processing step, and converter slag-making dephosphorization, the refining of LF stove white slags and the cast of continuous casting full guard keep steel clean, good quality of product；Continuous cast mold electromagnetic agitation, alleviates component segregation, shrinkage cavity, the rarefaction defect at strand center, and strand avoids straightening cracks susceptibility temperature range when aligning, ensure that slab quality；Steel rolling has produced 20MnV, 25MnV round steel of function admirable by wind sheltering heap cold a few hours after controlled rolling and controlled cooling, steels strapping.
Description
Technical field
The invention belongs to vertical bar round-bar pass technical fields, are related to a kind of production technology of hot rolling vertical bar pole, especially
It is related to a kind of production technology of circle chain of mine steel.
Background technology
20MnV, 25MnV pole are the raw materials for manufacturing circle chain of mine, and circle chain of mine is mainly used for underground coal mine
The quality of the haulage chain of drag conveyor, coal plough, flitting and other machinery, quality directly affects coal mine equipment
Service life.In production practices, usually requires that chain has enough intensity, load-carrying ability, there is certain toughness, prevent crisp
It is disconnected, also require there are the performances such as endurance, wear-resistant, corrosion-resistant.Requirement to circle chain of mine steel is：Heat treatment can quench in water
Fire；The complete through hardening of the entire section of chain link；Good cold-bending property is suitable for cold chaining；Good weldability.But China is for high intensity
The research of circle chain of mine is started late, and intensity rank is low.
20MnV, 25MnV vertical bar pole of φ 18mm and the φ 20mm of water steel production are the originals for manufacturing high-tensile round-link chain
Material, and high-tensile round-link chain is widely used in coal mine machinery.According to the state of development of current winning equipment industry, it is badly in need of obtaining
The ring chain steel of sufficient intensity, to meet the needs of safety in production.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of production technologies of ring chain steel, to obtain high intensity
The circle chain of mine steel of rank provides sound assurance for the safety in production of mine equipment.
The present invention is achieved by following technical solution.
A kind of production technology of circle chain of mine steel, includes the following steps：
(1) converter smelting
A. molten iron is blended into converter, ingredient includes in the molten iron being blended into：Si=0.20~0.80mass%, Mn=0.30
~0.80mass%, P≤0.140mass%, S≤0.040mass%；Molten iron temperature >=1250 DEG C；
Ingredient includes in the main slag making materials lime being added in converting process：CaO ＞ 90mass%, SiO2≤
1.5mass%, S ＜ 0.15mass%；Activity of lime ＞ 310ml；
B. according to the content selection operation method of P in molten iron, if P ＜ 0.120mass% in hot metal composition, using single slag process
Operation；If P >=0.120mass% in hot metal composition, operated using double slag process；Finishing slag basicity is controlled 3.2~3.6；
C. it is re-blow oxygen using highcasting speed, avoids multiple after-blow, it is ensured that a catch carbon success is striven in molten steel not peroxidating,
Improve the carbon content in molten steel；
D. it is to ensure tapping hole in order, using scum rod slag-stopping tapping；Ensure when tapping C >=0.06mass%, P≤
0.015mass%；
E. ladle requirement：Red packet is tapped, that is, empty ladle temperature >=900 DEG C before tapping, ladle bottom blowing brick is unimpeded, and ladle is clean
Only, there must not be packet edge, it is ensured that ladle nozzle automatically opens when continuous casting；
F. fero-manganesesilicon is used to match silicon, insufficient manganese ferromanganese polishing, vanadium iron matches vanadium；With SiAlCaBa or SiCaBa complex deoxidizations
Agent carries out final deoxidizing, and addition is 120kg/ stoves.
(2) LF stoves refine
A. calcium carbide, SiFe powder is used to make white slag, the dosage for reducing Al as far as possible forms liquid white slag in power supply 8min, and
Kept for the white slag time be not less than 10min；
B. refining terminates, and feeds 30 meters/stove of calcium line and carries out molten steel Calcium treatment, and after line feeding, soft argon blowing time is more than 8min, soft blow
When argon, the ladle top of the slag springs up not exposed molten steel slightly；
(3) continuous casting：It in casting process, is poured into a mould using full guard, avoids steel contacts air, and using crystallizer electricity
It stirs；Ensure full intermediate package operation when continuous casting.
(4) steel rolling
A. furnace temp controls before steel rolling：1100-1200 DEG C of bringing-up section, 1080-1130 DEG C of soaking zone, start rolling temperature
980-1030 DEG C, 1000 DEG C of desired value.
B. roll control：Mill speed 8-15 meter per seconds, rolled piece enter 900-970 DEG C of finishing mill temperature, water cooling are not worn after rolling
But, overhead cold bed is air-cooled, temperature when upper air-cooled cold bed：880-930℃.
(5) bundling is stacked：Timely handling stacking after steels strapping, wind sheltering heap is cold, heap cool time >=8h.
Further, in described (1) the converter smelting b step, if selection double slag operation, when blowing 4-6 minutes, initial stage
Slag.
Further, in described (1) the converter smelting Step d, if C ＜ 0.06mass% or after-blow number are big when tapping
In 2 times, then change the common steel grade of refining.
Further, in described (1) the converter smelting f steps, if endpoint molten steel oxidisability is strong, increase SiAlCaBa or
The dosage of SiCaBa double deoxidizers is to 121~130kg/ stoves.
Further, in described (2) the LF stoves refining a steps, used SiFe Powder Particle Sizes≤3mm.
Further, in the step (3), Metal in Tundish liquid level is 600-700mm, and tundish even pours process liquid
Face must not be less than 400mm；M-EMS Current 200A, frequency 4Hz；Casting speed 1.90m ± 0.02m/min, two is cold
Section specific water is 0.90-1.25L/kg (i.e. every kilogram of steel 0.90-1.25 rises water)；Strand straightening temperature >=900 DEG C.
Further, should be uniform when heating steel billet in described (4) the steel rolling a steps, steel billet head, in, the tail temperature difference≤30 DEG C.
The beneficial effects of the invention are as follows：
A kind of production technology of circle chain of mine steel of the present invention by converter smelting, the refining of LF stoves, continuous casting, is rolled
The processes such as steel, realize standardized production, and converter slag-making dephosphorization, the refining of LF stove white slags and the cast of continuous casting full guard keep steel clean
Only, good quality of product.Continuous cast mold electromagnetic agitation alleviates component segregation, shrinkage cavity, the rarefaction defect at strand center, casting
Base avoids straightening cracks susceptibility temperature range when aligning, and ensure that slab quality.Steel rolling after controlled rolling and controlled cooling, steels strapping by keeping away
Wind heap cold a few hours have produced 20MnV, 25MnV round steel of function admirable.
Specific implementation mode
Be described further below technical scheme of the present invention, but claimed range be not limited to it is described.
A kind of production technology of circle chain of mine steel of the present invention, includes the following steps：
(1) converter smelting
A. molten iron is blended into converter, ingredient includes in the molten iron being blended into：Si=0.20~0.80mass%, Mn=0.30
~0.80mass%, P≤0.140mass%, S≤0.040mass%；Molten iron temperature >=1250 DEG C；
Ingredient includes in the main slag making materials lime being added in converting process：CaO ＞ 90mass%, SiO2≤
1.5mass%, S ＜ 0.15mass%；Activity of lime ＞ 310ml；
B. according to the content selection operation method of P in molten iron, if P ＜ 0.120mass% in hot metal composition, using single slag process
Operation；If P >=0.120mass% in hot metal composition, operated using double slag process；Finishing slag basicity is controlled 3.2~3.6；If choosing
Select double slag operation, then when blowing 4-6 minutes, the slag of falling initial stage.
C. it is re-blow oxygen using highcasting speed, avoids multiple after-blow, it is ensured that a catch carbon success is striven in molten steel not peroxidating,
Improve the carbon content in molten steel；
D. it is to ensure tapping hole in order, using scum rod slag-stopping tapping；Ensure when tapping C >=0.06mass%, P≤
0.015mass%；If C ＜ 0.06mass% or after-blow number are more than 2 times when tapping, change the common steel grade of refining.
E. ladle requirement：Red packet is tapped, that is, empty ladle temperature >=900 DEG C before tapping, ladle bottom blowing brick is unimpeded, and ladle is clean
Only, there must not be packet edge, it is ensured that ladle nozzle automatically opens when continuous casting；
F. fero-manganesesilicon is used to match silicon, insufficient manganese ferromanganese polishing, vanadium iron matches vanadium；With SiAlCaBa or SiCaBa complex deoxidizations
Agent carries out final deoxidizing, and addition is 120kg/ stoves.If endpoint molten steel oxidisability is strong, the appropriate SiAlCaBa or SiCaBa that increases is answered
The dosage for closing deoxidier, can increase to 121~130kg/ stoves.
(2) LF stoves refine
A. calcium carbide, SiFe powder is used to make white slag, the dosage for reducing Al as far as possible forms liquid white slag in power supply 8min, and
Kept for the white slag time be not less than 10min；Used SiFe Powder Particle Sizes≤3mm.
B. refining terminates, and feeds 30 meters/stove of calcium line and carries out molten steel Calcium treatment, and after line feeding, soft argon blowing time is more than 8min, soft blow
When argon, the ladle top of the slag springs up not exposed molten steel slightly；
(3) continuous casting：It in casting process, is poured into a mould using full guard, avoids steel contacts air, and using crystallizer electricity
It stirs；Ensure full intermediate package operation when continuous casting.Metal in Tundish liquid level is 600-700mm, and tundish even pours process liquid
Face must not be less than 400mm；M-EMS Current 200A, frequency 4Hz, with mitigate the component segregation at strand center, shrinkage cavity,
Rarefaction defect；Casting speed 1.90m ± 0.02m/min, secondary cooling zone specific water are 0.90-1.25L/kg, i.e. every kilogram of steel 0.90-
1.25 rising water；Straightening cracks susceptibility temperature range is avoided in strand straightening temperature >=900 DEG C, after strand is by aligning external force at this time,
It is not easily susceptible to cracking.
(4) steel rolling
A. furnace temp controls before steel rolling：1100-1200 DEG C of bringing-up section, 1080-1130 DEG C of soaking zone, start rolling temperature
980-1030 DEG C, 1000 DEG C of desired value.Should be uniform when heating steel billet, steel billet head, in, the tail temperature difference≤30 DEG C.
B. roll control：Mill speed 8-15 meter per seconds, rolled piece enter 900-970 DEG C of finishing mill temperature, water cooling are not worn after rolling
But, overhead cold bed is air-cooled, temperature when upper air-cooled cold bed：880-930℃.
(5) bundling is stacked：Timely handling stacking after steels strapping, wind sheltering heap is cold, heap cool time >=8h.
Embodiment
Below by taking the production method of water steel 20MnV, 25MnV round steel as an example, technical scheme of the present invention is further described.Under
The step of not being described in detail in embodiment is stated, is handled using conventional method.
According to GB/T 10560-2008《Tensile round link chain steels for mining》20MnV, 25MnV steel of national Specification
Chemical composition and mechanical property, formulated the internal control target call of chemical composition mechanical property.GB/T 10560-2008 standards
It is shown in Table 1 with the chemical composition of 20MnV, 25MnV steel as defined in internal control target, mechanical property is shown in Table 2.
Size, shape, weight and the tolerance of 20MnV, 25MnV round steel should meet GB/T 702-2008《Hot rolled circular steel
With square steel form factor weight and tolerance》Regulation.
The chemical composition of 20MnV, 25MnV steel as defined in 1 GB/T 10560-2008 standards of table and internal control target
(mass%)
Note：Residual elements Cu is not more than 0.25mass% in steel, and Cr, Ni are respectively not more than 0.30mass%.
The mechanical property of 20MnV, 25MnV steel as defined in 2 GB/T 702-2008 standards of table and internal control target
Note：Mechanical property is examined after need to being heat-treated by the regulation of standard GB/T10560-2008.
The production technology of water steel coal mine ring chain steel 20MnV, 25MnV, technological process are：Molten iron, steel scrap -100t
Top and bottom combined blown converter smelting-slag-stopping tapping-deoxidation alloying-LF refining-continuous casting-heating-rolling bar-cooling-
Bundling.
Including following operating procedure：
1) converter smelting：Ingredient requirement：
Molten iron includes following component：Si=0.20~0.80mass%, Mn=0.30-0.80mass%, P≤
0.140mass%, S≤0.040mass%, molten iron temperature >=1250 DEG C.
The main slag making materials lime being added in converting process：CaO ＞ 90mass%, SiO2≤ 1.5mass%, S ＜
0.15mass%, activity degree ＞ 310ml.
2) smelting operation
(1) according to the content selection operation method of P in molten iron, if P ＜ 0.120mass% in hot metal composition, using single slag
Method operates, if P >=0.120mass% in hot metal composition, is operated using double slag process；P is early removed in early slugging.It is grasped according to double slags
Make, then when 4~6min of blowing, the slag of falling initial stage.By 3.2~3.6 controls, P, the S for reducing endpoint molten steel as far as possible contain finishing slag basicity
Amount.
(2) it is re-blow oxygen using highcasting speed, avoids multiple after-blow, it is ensured that molten steel not peroxidating.Strive a catch carbon success,
Improve the carbon content in molten steel.
(3) ensure tapping hole in order, using scum rod slag-stopping tapping；Ensure when tapping C >=0.06mass%, P≤
0.015mass%；If tapping C ＜ 0.06mass% or after-blow number are more than 2 times, change the common steel grade of refining.
(4) ladle requirement：It is required that red packet is tapped, that is, ladle temperature >=900 DEG C before tapping, ladle bottom blowing brick is unimpeded, steel
Packet is clean, must not have packet edge, it is ensured that ladle nozzle automatically opens when continuous casting.
(5) deoxidation alloying system
Silicon, insufficient manganese ferromanganese polishing are matched using fero-manganesesilicon, vanadium iron matches vanadium；With SiAlCaBa or SiCaBa double deoxidizers
Final deoxidizing is carried out, addition is 120kg/ stoves, if endpoint molten steel oxidisability is strong, the appropriate dosage for increasing double deoxidizer is extremely
121~130kg/ stoves.
(6) process liquid steel temperature control is shown in Table 3.
3 process liquid steel temperature of table
3) LF stoves refine
(1) LF stoves refinery practice flow：Molten steel enters position into refining station → bottom blowing Ar, thermometric, sampling → and (enters refining position
Set) → power transmission, break shell → heat, make white slag → thermometric → temperature regulating, be tuned into point → thermometric → go out position → feed silk, sampling → it is soft
Blow Ar → plus heat preserving agent → continuous casting.
(2) into refining station molten steel composition
In the tapping process of converter smelting, by deoxidation alloying, in so that the ingredient of molten steel is reached as defined in steel grade under
Limit value reduces the alloy addition in LF stove refining process, and molten steel composition and temperature target into LF refining station are shown in Table 4.
Molten steel composition and temperature target of the table 4 into LF refining station
(3) refining operation
1. molten steel arrives at a station, strong BOTTOM ARGON BLOWING break shell, thermometric.
2. at a temperature of corresponding arrive at a station, using corresponding electrode gear slugging, first slag charge (lime, refining is added
Slag, bauxite etc.), using fluorite shoddye, liquid white slag is formed in power supply 8min, and kept for the white slag time be not less than 10min.
White slag is made using calcium carbide, SiFe powder (granularity≤3mm), reduces the dosage of Al as far as possible.Refining process adjusts argon bottom-blowing flow,
It prevents refining from turning over excessive slag greatly, and adjusts dedusting fan air quantity, ensure refining furnace micro-pressure operation.
3. refining terminates, feed 30 meters/stove of calcium line and carry out molten steel Calcium treatment, after line feeding, soft argon blowing time is more than 8 minutes, soft
When Argon, the ladle top of the slag springs up not exposed molten steel slightly.
4. refining cycle is controlled by 42 ± 1min.
(4) go out refining station molten steel composition
In refining process, by finely tuning molten steel composition, finished product requirement is made up to, the molten steel composition for going out LF refining station is shown in
Table 5.
Table 5 goes out the molten steel composition at LF refining station
4) continuous casting
(1) in casting process, steel contacts air is avoided, i.e. full guard is poured into a mould, and uses M-EMS.
(2) casting blank section is 150mm × 150mm.
(3) liquidus temperature being calculated：20MnV is 1509 DEG C, and 25MnV is 1507 DEG C.Middle Baogang's coolant-temperature gage control
It is shown in Table 6.
6 molten steel temperature in tundish of table
(4) ensure full intermediate package operation when continuous casting, i.e. Metal in Tundish liquid level is 600-700mm, tundish
Process liquid level pours in company must not be less than 400mm.
(5) M-EMS Current 200A, frequency 4Hz.
(6) casting speed 1.90m ± 0.02m/min, secondary cooling zone specific water are 0.90-1.25L/kg (i.e. every kilogram of steel
0.90-1.25 rises water).
(7) straightening cracks susceptibility temperature range is avoided in strand straightening temperature >=900 DEG C.
(8) 1 piece of casting blank sample is taken to carry out macroscopic examination, the requirement of strand macroscopic examination quality objective per stove steel：Center porosity
≤ 1.0 grades, shrinkage cavity≤0.5 grade, non-metallic inclusion≤0.5 grade, centre burst≤1.0 grade, middle crack≤1.0 grade own
The sum of rank of inspection result is no more than 3.0 grades.
(9) strand indicates heat (batch) number, steel grade, and for casting blank stacking on other hot bases, wind sheltering heap is cold, the time >=8h, concentrates tissue
Rolling.Steel billet identifies：20MnV identifies 2V, 25MnV and identifies 5V.
5) steel rolling
(1) heating temperature
Furnace temp controls：1100-1200 DEG C of bringing-up section, 1080-1130 DEG C of soaking zone, start rolling temperature 980-1030
DEG C, 1000 DEG C of desired value controls furnace atmosphere, reduces iron scale.Heating steel billet should be uniform, steel billet head, in, the tail temperature difference≤
30 DEG C, in heating process, prevent steel billet from phenomena such as overheat, burning occur.
(2) roll control
1. rolling specs：φ18mm、φ20mm.
2. mill speed：8~15 meter per seconds.
3. being checked the behaviour in service and water-cooling system of the guide and guard of each machine frame rolling mill inlet and outlet, groove and roller-way before rolling
Confirm, it is ensured that meet production technology and product quality requirement.
4. rolled piece enters finishing mill temperature：900~970 DEG C.
5. not Water cooling after rolling.
6. temperature when upper air-cooled cold bed：880~930 DEG C.
7. timely handling stacking after steels strapping, wind sheltering heap is cold, heap cool time >=8h.
6) size Control and examination requirements
Production process should increase sampling time when increasing on-line period with the dimensional measurement frequency, open rolling or operation of rolling exception
Number, appearance and size are required to control, be examined according to standard GB/T 702-2008 standards and user.
Claims (6)
1. a kind of production technology of circle chain of mine steel, which is characterized in that include the following steps：
(1) converter smelting
A. molten iron is blended into converter, ingredient includes in the molten iron being blended into：Si=0.20~0.80mass%, Mn=0.30~
0.80mass%, P≤0.140mass%, S≤0.040mass%；Molten iron temperature >=1250 DEG C；
Ingredient includes in the main slag making materials lime being added in converting process：CaO ＞ 90mass%, SiO2≤ 1.5mass%, S
＜ 0.15mass%；Activity of lime ＞ 310ml；
B. according to the content selection operation method of P in molten iron, if P ＜ 0.120mass% in hot metal composition, are grasped using single slag process
Make；If P >=0.120mass% in hot metal composition, operated using double slag process, if selection double slag operation, blows 4-6 minutes
When, the slag of falling initial stage；Finishing slag basicity is controlled 3.2~3.6；
C. it is re-blow oxygen using highcasting speed, avoids multiple after-blow, it is ensured that molten steel not peroxidating is striven a catch carbon success, improved
Carbon content in molten steel；
D. it is to ensure tapping hole in order, using scum rod slag-stopping tapping；Ensure when tapping C >=0.06mass%, P≤
0.015mass%；
E. ladle requirement：Red packet is tapped, that is, empty ladle temperature >=900 DEG C before tapping, ladle bottom blowing brick is unimpeded, and ladle is clean,
There must not be packet edge, it is ensured that ladle nozzle automatically opens when continuous casting；
F. fero-manganesesilicon is used to match silicon, insufficient manganese ferromanganese polishing, vanadium iron matches vanadium；With SiAlCaBa or SiCaBa double deoxidizers into
Row final deoxidizing, addition are 120kg/ stoves；
(2) LF stoves refine
A. it uses calcium carbide, SiFe powder to make white slag, reduces the dosage of Al as far as possible, form liquid white slag in power supply 8min, and protect
The white slag time is held not less than 10min；
B. refining terminates, and feeds 30 meters/stove of calcium line and carries out molten steel Calcium treatment, and after line feeding, soft argon blowing time is more than 8min, soft blow argon
When, the ladle top of the slag springs up not exposed molten steel slightly；
(3) continuous casting：It in casting process, is poured into a mould using full guard, avoids steel contacts air, and stir using crystallizer electricity；Even
Ensure full intermediate package operation when casting cast；
(4) steel rolling
A. furnace temp controls before steel rolling：1100-1200 DEG C of bringing-up section, 1080-1130 DEG C of soaking zone, start rolling temperature 980-
1030 DEG C, 1000 DEG C of desired value；
B. roll control：Mill speed 8-15 meter per seconds, rolled piece enter 900-970 DEG C of finishing mill temperature, not Water cooling after rolling,
Overhead cold bed is air-cooled, temperature when upper air-cooled cold bed：880-930℃；
(5) bundling is stacked：Timely handling stacking after steels strapping, wind sheltering heap is cold, heap cool time >=8h.
2. a kind of production technology of circle chain of mine steel according to claim 1, it is characterised in that：(1) the converter smelting
It refines in Step d, if C ＜ 0.06mass% or after-blow number are more than 2 times when tapping, changes the common steel grade of refining.
3. a kind of production technology of circle chain of mine steel according to claim 1, it is characterised in that：(1) the converter smelting
Refine in f steps, if endpoint molten steel oxidisability is strong, increase the dosages of SiAlCaBa or SiCaBa double deoxidizers to 121~
130kg/ stoves.
4. a kind of production technology of circle chain of mine steel according to claim 1, it is characterised in that：(2) the LF stoves essence
It refines in a steps, used SiFe Powder Particle Sizes≤3mm.
5. a kind of production technology of circle chain of mine steel according to claim 1, it is characterised in that：In the step (3),
Metal in Tundish liquid level is 600-700mm, and even 400mm must not be less than to tundish by pouring process liquid level；M-EMS
Electric current 200A, frequency 4Hz；Casting speed 1.90m ± 0.02m/min, secondary cooling zone specific water are 0.90-1.25L/kg (i.e. every thousand
Gram steel 0.90-1.25 rises water)；Strand straightening temperature >=900 DEG C.
6. a kind of production technology of circle chain of mine steel according to claim 1, it is characterised in that：(4) the steel rolling a steps
In rapid, when heating steel billet, should be uniform, steel billet head, in, the tail temperature difference≤30 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610952185.5A CN106498116B (en) | 2016-10-27 | 2016-10-27 | A kind of production technology of circle chain of mine steel |
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| CN100513616C (en) * | 2006-04-07 | 2009-07-15 | 宣化钢铁集团有限责任公司 | Low-cost steel for circular chain for mine and production process thereof |
| CN101397636B (en) * | 2007-09-25 | 2010-12-01 | 宝山钢铁股份有限公司 | High toughness ring chain steel for mine and method for producing the same |
| CN103276303A (en) * | 2013-06-07 | 2013-09-04 | 南京钢铁股份有限公司 | High strength chain steel for mine, and preparation method thereof |
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