CN100491016C - Killed steel casting method - Google Patents
Killed steel casting method Download PDFInfo
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- CN100491016C CN100491016C CNB2006100224116A CN200610022411A CN100491016C CN 100491016 C CN100491016 C CN 100491016C CN B2006100224116 A CNB2006100224116 A CN B2006100224116A CN 200610022411 A CN200610022411 A CN 200610022411A CN 100491016 C CN100491016 C CN 100491016C
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Abstract
A periodic tube rolling machine with slant rolling drill rig is used to generate big caliber thick wall steel blocks, to satisfy the inside and surface quality requirements. Inner cavity working section of the mold is wave shape multilateral cross section shape wave ingot mold, with sulfur content controlled under 0.025% of the steel liquid, casting temperature within 40 to 80DEG C, linear speed 80 to 230mm/min, cracking ratio lower than 5%, pass rate 98.81%, with low consumption of metal, low cost, especially suitable for rolling into seamless steel tubes with multi types and specification and phi>/=426mm.
Description
Technical field
The present invention relates to a kind of metallurgy founding method, especially utilize the pilger mill unit of being with Mannesmann piercing mill to produce the casting method of the killed steel of the effective steel ingot of heavy caliber thick wall.
Background technology
At present, the general downhill casting that adopts of killed steel casting; And downhill casting is unlikely low excessively for the temperature of a steel ingot making last casting, has to adopt higher casting rate; And bottom casting some the steel ingots of when teeming, can casting simultaneously at short notice, it is whole more convenient to annotate velocity modulation.The casting rate of downhill casting is generally 600～900mm/min, and the casting rate of bottom casting is generally 170～350mm/min.Cast temperature is generally represented with the casting degree of superheat, 100～120 ℃ of the degrees of superheat of generally casting, ingot mould temperature ≯ 80 ℃.
The pilger mill unit for reducing cost and simplifying technological process, has been cancelled hydraulic pressure punching and middle heating furnace in technological improvement and innovation, directly bore a hole on the roll piercing unit.And the pilger mill unit of band Mannesmann piercing mill is in production application during in the large-sized heavy-wall tube of industry φ 〉=426mm such as oil, electric power, chemical industry, machinery, building, the applicant has adopted that wave is little, the recessed degree of depth little (being that action is little) of trough, the rippled edge polygon steel ingot that peak separation is little---and be tube rolling with great circle wave steel ingot.This round wave steel ingot that is used to cast of killed steel casting technique routinely, the slow cooling time is short partially when having that casting rate is fast, cast temperature is higher and adopting mould cold, can make steel ingot chill attenuate, ferrostatic pressure increases fast in the mould, easily in steel ingot, the bottom cracks, gas also is difficult for discharging in the steel; Make whole ingot solidification time lengthening in addition, cause the composition segregation to increase the weight of, field trash increases, and column crystal is relatively more flourishing, and the increase of steel ingot internal-external temperature difference, and producing the underbead crack tendency increases; The pilger mill unit that can not satisfy confession band Mannesmann piercing mill is difficult to make the pilger mill unit to realize that metal consumption is few in the inside and the surface quality requirement of rolling heavy caliber thick wall seamless pipe with steel ingot, and cost is low, the market competition advantage of the many variety production of many specifications.
Summary of the invention
Technical problem to be solved by this invention provides a kind of casting method of killed steel of requirement of producing the inside of the effective steel ingot of heavy caliber thick wall and surface quality for the pilger mill unit that satisfies the band Mannesmann piercing mill.
The technical solution adopted for the present invention to solve the technical problems is: adopting the inner chamber active section of die body is the ingot mould of the wave section of rippled edge polygonal cross-section shape, with bottom casting casting tube rolling great circle wave killed ingot, sulfur content is controlled at below 0.025% in the molten steel, the casting degree of superheat is controlled in 40～65 ℃ of scopes, the casting linear velocity is 80～160m/min, the temperature of the die body of ingot mould is 40～60 ℃ during casting, the slow cooling mode can adopt according to the steel grade difference that mould is cold, the hole is cold or cheat the cold annealing way that adds, mould cool time 〉=13h when adopting mould cold.
In order further to optimize technique scheme, adopt from molten type solid protective slag protection casting, the ingot mould inner chamber be up-small and down-big and its cap mouth adopt hang insert heat-insulating shield, on add the mode of heat preserving agent or exothermic mixture.
The invention has the beneficial effects as follows: when adopting the general poring rate and the casting degree of superheat to produce, water the steel ingot that casts out and large quantities of longitudinal cracks occurred, the ingot crack percent defective is up to 40%.After using this casting technique, the ingot crack rate drops to below 5%.Existing Pi Liang big production steel ingot qualification rate 98.81%.After adopting technique scheme, not only can reduce the tube rolling inside and outside fold defect of face crack, underbead crack and tube rolling of great circle wave steel ingot, and can reduce composition segregation and structural heterogenity, gas is mingled with in the minimizing steel, thereby the pilger mill unit that satisfies the band Mannesmann piercing mill is produced the inside of the effective steel ingot of heavy caliber thick wall and the requirement of surface quality.Utilize method of the present invention to produce 20
#, 45
#, JS20, JS45,20g, A658, X52, Q345B, 35Mn2, J55, A658, C steel, 35CrMoA, 42CrMoA, 50Mn, 40Cr, 1Cr5Mo etc. are used for the seamless steel pipe steel ingot of industries such as rolling oil, electric power, chemical industry, machinery, building, the steel ingot comprehensive qualified rate is 98.81%, metal consumption is few, and cost is low.The steel ingot that uses the present invention to produce directly is rolled into Φ 406～508 * 22～65 heavy caliber thick wall seamless steel tubes on the pilger mill unit, its lumber recovery is 78.65%; Or expanding heavy caliber seamless steel pipes such as making Φ 450～630 * 14～40 through the thermal expansion machine group again, its lumber recovery is 73.50%; Finished product rate is 77.77%, is particularly useful for the heavy caliber thick wall seamless steel tube of many kinds, many specifications more than rolling Φ 〉=426mm on the pilger mill unit.
Description of drawings
Fig. 1 is an axial cutaway view of the present invention, there is shown the ingot mould inner chamber that is divided into three sections designs.
Fig. 2 is the vertical view of Fig. 1, there is shown the rippled edge polygonal cross-section shape of the wave section on ingot mould top.
Be labeled as among the figure: die body 1, wave section 2, changeover portion 3, circle section 4.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
The casting method of killed steel of the present invention, adopt the ingot mould of wave section 2 as shown in Figure 1, the inner chamber active section of its die body 1 is a rippled edge polygonal cross-section shape, and preferably adopting inner chamber is the ingot mould of three sections settings, the inner chamber that is die body 1 comprises the changeover portion 3 of the bottom that is set in sequence in wave section 2 and the circle section 4 of circular cross-section, is connected smoothly by changeover portion 3 between circle section 4 and the wave section 2.Adopt above-mentioned ingot mould with bottom casting casting tube rolling with great circle wave killed ingot, being controlled at below 0.025% of sulfur content in the molten steel, the molten steel casting degree of superheat is controlled in 40～80 ℃ of scopes, the casting linear velocity is 80～230mm/min.
Cast temperature and casting rate influence to ingot quality that both are closely related, instruct casting process to operate with " high temperature is annotated slowly " and " low temperature is annotated soon " usually.Be identical with the too high influence to ingot quality of cast temperature when casting rate is too fast, can make the heat of bringing in the mould in the same time increase, mean temperature height in the mould will make steel ingot chill attenuate, produce longitudinal crack in the middle and lower part of steel ingot easily; Simultaneously also make whole ingot solidification time lengthening, the composition segregation increases the weight of, and field trash increases, and column crystal is flourishing.The present invention is inhibited the phenomenon of steel ingot chill attenuate by reduction casting rate, cast temperature, ferrostatic pressure increases mild in the mould, not only when ingot steel casting, avoided the generation of longitudinal crack, produce the folding defective of steel pipe when also having eliminated tube rolling simultaneously outward, the reduction of casting rate makes in its steel gas discharge relatively easy.
In order to reach better effect, the casting degree of superheat is controlled in 40～65 ℃ of scopes, and the casting linear velocity is 100～160mm/min.
Same reason, in order to reach better effect, the temperature of the die body 1 of ingot mould is 40～60 ℃ during casting.
According to routine, adopt from molten type solid protective slag protection casting, the ingot mould inner chamber be up-small and down-big and its cap mouth adopt hang insert heat-insulating shield, on add the mode of heat preserving agent or exothermic mixture.
In addition, in order to reduce the steel ingot internal-external temperature difference, suppress to produce the tendency of underbead crack, the mode of cooling adopts the slow cooling mode.Can adopt according to the steel grade difference that mould is cold, the hole is cold or cheat the cold annealing way etc. that adds, mould cool time 〉=13h when adopting mould cold.
Embodiment 1:
The casting method of killed steel of the present invention, the ingot mould of usefulness wave section 2 as shown in Figure 1 adopts bottom casting casting 20 at the 90t electric furnace
#The up-small and down-big 25 limit tube rollings great circle wave steel ingot of Φ 580/4.0t.
1. casting tube rolling steel ingot technology flow process:
Electric furnace → DC (direct current)-ladle refining furnace LF → die casting (car casting) → mould is cold → demoulding → surface of steel ingot cleaning
2. steel quality control:
2.1 feed CaSi line 0.4～0.6kg/t steel before refining finishes, refining furnace tapping sulfur content is controlled at below 0.025%;
2.2 it is 1560～1580 ℃ that molten steel goes out the refining furnace temperature;
3. casting specification requirements such as heat-insulating shield, covering slag and carbonization rice husk heat preserving agent:
3.1 heat-insulating shield specification requirement:
The heat-insulating shield size sees Table 2
Bulk density:＜0.95g/cm
3Moisture content＜1%
Rupture strength:〉1.5Mpa (15kgf/cm
2) heater wire contraction (1200 ℃ of 1h):＜6%
Dimensional discrepancy: ± 4mm thickness deviation: ± 2mm
3.2 casting sees Table 1 with the covering slag technical conditions:
The table 1 circle wave steel ingot casting physicochemical property of covering slag
| The covering slag model | C | SiO 2 | CaO | Al 2O 3 | Fe 2O 3 | Basicity (CaO/ SiO 2) | The hemisphere point (℃) | Burn-off rate (second) | Granularity (100 order) |
| 4213 | 11～ 14 | 39～ 44 | 9～13 | 9～14 | 4～6 | 0.2～ 0.33 | 1190～ 1230 | 120～ 180 | >80％ |
3.3 carbonization rice husk heat preserving agent specification requirement:
Fixed carbon 〉=45%
Unit weight≤0.10g/cm
3
Moisture content≤0.5%
4. the preparation before casting:
4.1 forbid to use cold mould and scald mould, the ingot mould temperature is not more than 60 ℃ during casting;
4.2 use ingot mould that the residual steel dry slag of inwall is cleaned with water totally, purge with compressed air more at every turn;
4.3 new ingot mould must be baked to 80～120 ℃, inwall iron rust etc. is cleaned with water totally, and the ingot mould temperature is not more than 60 ℃ before guaranteeing casting, must not be cold mould or boiling hot mould.
The cooling 4.4 ingot mould is forbidden fetching water.
4.5 feed trumpet dress:
4.5.1 the feed trumpet height is pressed listed execution in the table 2;
4.5.2 the injecting pipe brick inwall floats sand, the brick thorn should be cleaned with water clean.
4.5.3 between injecting pipe brick and the centre runner brick, and seam should be rotated and put the deutomerite brick again after several circles make its fluid-tight engagement between injecting pipe brick and the injecting pipe brick.Injecting pipe brick should be laid proper.
4.5.5 fill the dry sand of the 3～10mm that sieves between injecting pipe brick and feed trumpet iron-clad, back-up sand should be tight.Need the calibration of feed trumpet funnel brick before irritating sand.When surpassing 5mm, feed trumpet iron-clad pin and base plate slit use pug jam-pack slit on every side.
4.6 the installation of heat-insulating shield:
4.6.1 residual steel, residue on the ingot mould must be cleaned out before installing.
4.6.2 the heat-insulating shield that makes moist must not be installed.
4.6.3 earlier the heat-insulating shield symmetry is hung in the die orifice when installing, the wedge lower edge must not exceed the link plate lower edge during wedging.The heat-insulating shield upper edge should be equal with the die orifice upper edge, and height must not be greater than 10mm
4.6.4 heat-insulating shield should be close to die wall, link plate and wedge gap must not be greater than 4mm
4.6.5 necessary dry, the cleaning of heat-insulating shield, the mould temperature must not be greater than 200 ℃ during the dress plate.
4.7 before the ingot casting feed trumpet and ingot mould are thoroughly cleared up, are guaranteed unimpeded, the cleaning of Tang Dao system, no foreign matter in the mould.
Hang covering slag 4.8 open before watering.The covering slag proportioning is by the preparation of 4213 technological requirements, and covering slag must toast drying, and moisture content is packed with low bag less than 0.5%, hangs height and is advisable with distance ingot mould bottom 100～150mm.
4.9 the heat preserving agent carbonization rice husk is prepared by the 1kg/t steel;
5. pouring operation:
5.1 the casting degree of superheat: 45～80 ℃;
5.2 poring rate: see Table 2
Should determine casting rate according to liquid steel temperature, steel grade, ingot shape size and season 5.3 water the steel operating personnel, the molten steel face should steadily rise during casting, and accomplishes:
1. the even covering of covering slag is not rolled;
When 2. liquid steel temperature was high, it was slow partially to annotate speed, and it is fast to annotate speed when temperature is low;
3. middle stream is opened and is watered, and even speed governing is annotated speed steadily, when the ingot body waters to distance cap mouth line 50～100mm, begins to subtract stream, reduces to gradually and fills in the stream thigh.
4. nozzle clogging should in time be destroyed but can not fall in ingot mould or the feed trumpet, and the mouth of a river dwindles with oxygen and burns, and burning oxygen should water to move when wrapping and carry out at a plate.
5.4 the punching press that stops must not fill in cap portion.Add dry carbonization rice husk or other heat preserving agent behind every slab cap waterborne and be incubated, cover and want evenly, its consumption sees Table 2.
6. casting back motor-car, slow cooling and the demoulding require:
6.1 it is to have watered the time that begins between the demoulding with last plate (contain and singly water plate) that molten steel has watered the back motor-car time.
6.2 the slow cooling time, system watered the time that begins between the demoulding with last plate (contain and singly water plate).
6.3 the ingot mould time to be poured: the ingot mould time to be poured is meant the time of extremely casting after ingot mould is put well between the beginning.The ingot mould time to be poured must not be greater than 36 hours.
6.4 adopt the cold mode of mould after the steel ingot casting is finished, motor-car time and slow cooling time after the casting see Table 3.
7. carry out removing surface by general surface requirements after the demoulding.
The 90t electric furnace adopts the up-small and down-big 23 limit tube rollings great circle wave steel ingot of bottom casting casting 20G, Φ 500/2.5t
1. casting tube rolling steel ingot technology flow process:
Electric furnace → DC (direct current)-ladle refining furnace LF → VD (application of vacuum) → die casting (car casting) → mould is cold → demoulding → surface of steel ingot cleaning
2. steel quality control:
2.1 undesired and new the first two stove of body of heater of body of heater must not be smelted this steel;
2.2 new ladle, new ingot mould must not use;
2.3 casting system must clean drying, adopts Ar gas shiled casting;
2.4 feed CaSi line 0.4～0.6kg/t steel before refining finishes, refining furnace tapping sulphur is controlled at below 0.025%, it is 1565～1580 ℃ that molten steel goes out the VD furnace temperature;
3 cast with heat-insulating shield, covering slag, carbonization rice husk heat preserving agent specification requirement (seeing example 1):
4. the preparation before casting:
4.1 select the good ingot mould of inner surface quality for use, to carry out the brush die worker and do, casting system adopts high-quality refractory material.
4.2 forbid to use cold mould and scald mould, the ingot mould temperature is not more than 60 ℃ during casting;
4.3 use the feed trumpet height to see Table 2
4.3 use ingot mould that the residual steel dry slag of inwall is cleaned with water totally, purge with compressed air more at every turn;
The cooling 4.4 ingot mould is forbidden fetching water.
4.5 other is referring to example 1.
5. pouring operation:
5.1 the casting degree of superheat: 60～90 ℃;
5.2 poring rate: see Table 2
Should determine casting rate according to liquid steel temperature and season 5.3 water the steel operating personnel, the molten steel face should steadily rise during casting, and accomplishes:
1. the even covering of covering slag is not rolled;
When 2. liquid steel temperature was high, it was slow partially to annotate speed, and it is fast to annotate speed when temperature is low;
3. middle stream is opened and is watered, and even speed governing is annotated speed steadily, when the ingot body waters to distance cap mouth line 50～100mm, begins to subtract stream, reduces to gradually and fills in the stream thigh.
4. nozzle clogging should in time be destroyed but can not fall in ingot mould or the feed trumpet, and the mouth of a river dwindles with oxygen and burns, and burning oxygen should water to move when wrapping and carry out at a plate.
5.4 the punching press that stops must not fill in cap portion.Add dry heat preserving agent or other exothermic mixture behind every slab cap waterborne and be incubated, cover and want evenly, its consumption sees Table 2.
6. casting back motor-car, slow cooling and the demoulding require:
6.1 it is to have watered the time that begins between the motor-car with last plate (contain and singly water plate) that molten steel has watered the back motor-car time.
6.2 the slow cooling time, system watered the time that begins between the demoulding with last plate (contain and singly water plate).
6.3 the ingot mould time to be poured: the ingot mould time to be poured is meant the time of extremely casting after ingot mould is put well between the beginning.The ingot mould time to be poured must not be greater than 36 hours.
6.4 adopt the cold mode of mould after the steel ingot casting is finished, motor-car time and slow cooling time after the casting see Table 3.
7. carry out removing surface by senior surface requirements after the demoulding.
The 40t direct current electric arc furnace adopts the up-small and down-big 19 limit tube rollings of bottom casting casting 20#, Φ 350/0.9t circle wave steel ingot
1. casting tube rolling steel ingot technology flow process:
40T direct current electric arc furnace → LF (ladle refining furnace) → die casting (pit casting) → mould is cold → demoulding → surface of steel ingot cleaning
2. steel quality control:
2.1 casting system must clean drying;
2.2 feed CaSi line 0.4～0.6kg/t steel before refining finishes, refining furnace tapping sulphur is controlled at below 0.025%, it is 1570～1600 ℃ that molten steel goes out the LF furnace temperature;
2.3 cast with heat-insulating shield, covering slag, carbonization rice husk heat preserving agent specification requirement (seeing example 1):
3. preparation and points for attention before casting:
3.1 forbid to use cold mould and scald mould, the ingot mould temperature is not more than 60 ℃ during casting;
3.2 use the feed trumpet height to see Table 2;
3.3 use ingot mould that the residual steel dry slag of inwall is cleaned with water totally, purge with compressed air more at every turn;
The cooling 3.4 ingot mould is forbidden fetching water.
3.5 other is referring to example 1.
4. pouring operation:
4.1 the casting degree of superheat: 80～120 ℃;
4.2 poring rate: see Table 2
Should determine casting rate according to liquid steel temperature and season 4.3 water the steel operating personnel, the molten steel face should steadily rise during casting, and accomplishes:
1. the even covering of covering slag is not rolled;
When 2. liquid steel temperature was high, it was slow partially to annotate speed, and it is fast to annotate speed when temperature is low;
3. middle stream is opened and is watered, and even speed governing is annotated speed steadily, when the ingot body waters to distance cap mouth line 50～100mm, begins to subtract stream, reduces to gradually and fills in the stream thigh.
4. nozzle clogging should in time be destroyed but can not fall in ingot mould or the feed trumpet, and the mouth of a river dwindles with oxygen and burns, and burning oxygen should water to move when wrapping and carry out at a plate.
4.4 the punching press that stops must not fill in cap portion.Add dry carbonization rice husk or other heat preserving agent behind every slab cap waterborne and be incubated, cover and want evenly, its consumption sees Table 2.
5. the casting back slow cooling and the demoulding require:
5.1 molten steel has watered back demould time system and has watered the time that begins between the demoulding with last plate (contain and singly water plate).
5.2 the slow cooling time, system watered the time that begins between the demoulding with last plate (contain and singly water plate).
5.3 the ingot mould time to be poured: the ingot mould time to be poured is meant the time of extremely casting after ingot mould is put well between the beginning.The ingot mould time to be poured must not be greater than 36 hours.
5.4 adopt the cold mode of mould after the steel ingot casting is finished, the mould cool time after the casting sees Table 3.
6. carry out removing surface by general surface requirements after the demoulding.
Embodiment 4
The 40t direct current electric arc furnace adopts the up-small and down-big 27 limit tube rollings great circle wave steel ingot of bottom casting casting 42CrMo, Φ 650/5.5t
1. casting tube rolling steel ingot technology flow process:
40t direct current electric arc furnace → LF (ladle refining furnace) → VD (application of vacuum) → die casting (pit casting) → hole is cold → demoulding → annealing → surface of steel ingot cleaning
2. steel quality control:
2.1 undesired and new the first two stove of body of heater of body of heater must not be smelted this steel;
2.2 new ladle, new ingot mould must not use;
2.3 casting system must clean drying, adopts Ar gas shiled casting;
2.4 feed CaSi line 0.4～0.6kg/t steel before refining finishes, refining furnace tapping sulphur is controlled at below 0.025%, it is 1560～1580 ℃ that molten steel goes out the VD furnace temperature;
3 cast with heat-insulating shield, covering slag, carbonization rice husk heat preserving agent specification requirement (seeing example 1):
4. the preparation before casting:
4.1 select the good ingot mould of inner surface quality for use, to carry out the brush die worker and do, casting system adopts high-quality refractory material.
4.2 forbid to use cold mould and scald mould, the ingot mould temperature is not more than 60 ℃ during casting;
4.3 use the feed trumpet height to see Table 2
4.3 use ingot mould that the residual steel dry slag of inwall is cleaned with water totally, purge with compressed air more at every turn;
The cooling 4.4 ingot mould is forbidden fetching water.
4.5 other is referring to example 1.
5. pouring operation:
5.1 the casting degree of superheat: 40～80 ℃;
5.2 poring rate: see Table 2
Should determine casting rate according to liquid steel temperature and season 5.3 water the steel operating personnel, the molten steel face should steadily rise during casting, and accomplishes:
1. the even covering of covering slag is not rolled;
When 2. liquid steel temperature was high, it was slow partially to annotate speed, and it is fast to annotate speed when temperature is low;
3. middle stream is opened and is watered, and even speed governing is annotated speed steadily, when the ingot body waters to distance cap mouth line 50～100mm, begins to subtract stream, reduces to gradually and fills in the stream thigh.
4. nozzle clogging should in time be destroyed but can not fall in ingot mould or the feed trumpet, and the mouth of a river dwindles with oxygen and burns, and burning oxygen should water to move when wrapping and carry out at a plate.
5.4 the punching press that stops must not fill in cap portion.Add dry carbonization rice husk or other heat preserving agent behind every slab cap waterborne and be incubated, cover and want evenly, its consumption sees Table 2.
6. cast the back drawing-die, cheat cold and the annealing requirement:
6.1 it is to have watered the time that begins between the drawing-die with last plate (contain and singly water plate) that molten steel has watered the back drawing-die time.
6.2 the hole cool time is to have watered back drawing-die steel ingot to go into to cheat steel ingot and begin time between the hole.
6.3 the ingot mould time to be poured: the ingot mould time to be poured is meant the time of extremely casting after ingot mould is put well between the beginning.The ingot mould time to be poured must not be greater than 36 hours.
6.4 adopt the cold mode in hole after the steel ingot casting is finished, drawing-die time after the casting and hole cool time see Table 3.
6.5 the steel ingot of cheating after cold is carried out annealing in process, anneals by the full annealing curve.
7. the steel ingot after the annealing adopts the sand milling manner of cleaning up, carries out removing surface by senior surface requirements.
Embodiment 5
The 40t direct current electric arc furnace adopts the up-small and down-big 23 limit tube rollings of bottom casting casting 10#, Φ 450/1.9t circle wave steel ingot
1. casting tube rolling steel ingot technology flow process:
40T direct current electric arc furnace → LF (ladle refining furnace) → die casting (pit casting) → mould is cold → demoulding → surface of steel ingot cleaning
2. steel quality control:
2.1 casting system must clean drying;
2.2 feed CaSi line 0.4～0.6kg/t steel before refining finishes, refining furnace tapping sulphur is controlled at below 0.025%, it is 1580～1600 ℃ that molten steel goes out the LF furnace temperature;
2.3 cast with heat-insulating shield, covering slag, carbonization rice husk heat preserving agent specification requirement (seeing example 1):
3. preparation and points for attention before casting:
3.1 forbid to use cold mould and scald mould, the ingot mould temperature is not more than 60 ℃ during casting;
3.2 use the feed trumpet height to see Table 2;
3.3 use ingot mould that the residual steel dry slag of inwall is cleaned with water totally, purge with compressed air more at every turn;
The cooling 3.4 ingot mould is forbidden fetching water.
3.5 other is referring to example 1.
4. pouring operation:
4.1 the casting degree of superheat: 70～100 ℃;
4.2 poring rate: see Table 2
Should determine casting rate according to liquid steel temperature and season 4.3 water the steel operating personnel, the molten steel face should steadily rise during casting, and accomplishes:
1. the even covering of covering slag is not rolled;
When 2. liquid steel temperature was high, it was slow partially to annotate speed, and it is fast to annotate speed when temperature is low;
3. middle stream is opened and is watered, and even speed governing is annotated speed steadily, when the ingot body waters to distance cap mouth line 50～100mm, begins to subtract stream, reduces to gradually and fills in the stream thigh.
4. nozzle clogging should in time be destroyed but can not fall in ingot mould or the feed trumpet, and the mouth of a river dwindles with oxygen and burns, and burning oxygen should water to move when wrapping and carry out at a plate.
4.4 the punching press that stops must not fill in cap portion.Add dry carbonization rice husk or other heat preserving agent behind every slab cap waterborne and be incubated, cover and want evenly, its consumption sees Table 2.
5. the casting back slow cooling and the demoulding require:
5.1 molten steel has watered back demould time system and has watered the time that begins between the demoulding with last plate (contain and singly water plate).
5.2 the slow cooling time, system watered the time that begins between the demoulding with last plate (contain and singly water plate).
5.3 the ingot mould time to be poured: the ingot mould time to be poured is meant the time of extremely casting after ingot mould is put well between the beginning.The ingot mould time to be poured must not be greater than 36 hours.
5.4 adopt the cold mode of mould after the steel ingot casting is finished, the mould cool time after the casting sees Table 3.
6. carry out removing surface by general surface requirements after the demoulding.
Table 2 90t electric furnace casting circle wave ingot casting rate, cap portion filling time, heat-insulating shield size, covering slag and heat preserving agent consumption
| Example | Ingot shape | Steel grade | Ingot body casting linear velocity mm/min | The cap portion filling time | Heat-insulating shield height mm | Heat-insulating shield thickness mm | Covering slag consumption kg/ props up | Heat preserving agent consumption amount kg/ props up | Feed trumpet height mm |
| Example 1 | ∮580/4.0t | 20# | 100～140 | 4＇00～5＇00＂ | 240 | 30 | 10 | 3 | 2650 |
| Example 2 | ∮500/2.5t | 20G | 140～180 | 2＇00～3＇00＂ | 300 | 30 | 7.0 | 2.5 | 2450 |
| Example 3 | ∮350/0.9t | 20# | 180～230 | 1＇30～2＇30＂ | 200 | 30 | 2.0 | 1 | 1850 |
| Example 4 | ∮650/5.5t | 42CrMo | 80～120 | 5＇30～6＇30＂ | 320 | 35 | 13 | 6 | 2850 |
| Example 5 | ∮450/1.9t | 10# | 160～200 | 3＇00～4＇00＂ | 220 | 30 | 5 | 2 | 2050 |
Table 3 90t electric furnace die casting circle wave steel ingot motor-car and slow cooling time
| Example | Ingot shape | Steel grade | The slow cooling mode | Motor-car or drawing-die time | Slow cooling or hole cool time |
| Example 1 | Φ580/4.0 | 20 # | Mould is cold | 3h | ≥16h |
| Example 2 | Φ500/2.5 | 20G | Mould is cold | 2h30min | ≥13h |
| Example 3 | Φ350/0.9 | 20# | Mould is cold | / | ≥13h |
| Example 4 | Φ650/0.9 | 42CrMo | Cheat cold+annealing | 4h30min | ≥30h |
| Example 5 | Φ450/1.9 | 10# | Mould is cold | / | ≥13h |
Claims (3)
1, the casting method of killed steel, it is characterized in that: adopting the inner chamber active section of die body (1) is the ingot mould of the wave section (2) of rippled edge polygonal cross-section shape, with bottom casting casting tube rolling great circle wave killed ingot, sulfur content is controlled at below 0.025% in the molten steel, the casting degree of superheat is controlled in 40～65 ℃ of scopes, the casting linear velocity is 80～160mm/min, and the temperature of the die body of ingot mould (1) is 40～60 ℃ during casting, mould cool time 〉=13h when adopting mould cold.
2, the casting method of killed steel as claimed in claim 1 is characterized in that: adopt from molten type solid protective slag protection casting, the ingot mould inner chamber be up-small and down-big and its cap mouth adopt hang insert heat-insulating shield, on add the mode of heat preserving agent or exothermic mixture.
3, the casting method of killed steel as claimed in claim 1, it is characterized in that: the inner chamber of die body (1) also comprises the changeover portion (3) of the bottom that is set in sequence in wave section (2) and the circle section (4) of circular cross-section, is connected smoothly by changeover portion (3) between circle section (4) and the wave section (2).
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| CN105642844B (en) * | 2016-01-07 | 2018-03-13 | 山西太钢不锈钢股份有限公司 | A kind of casting method of 2205 two-phase stainless steel ingot |
| MX2019001655A (en) | 2016-08-09 | 2019-06-10 | Ak Steel Properties Inc | Tundish funnel. |
| CN112387944A (en) * | 2020-11-25 | 2021-02-23 | 山西太钢不锈钢股份有限公司 | Method for solving steel flowing on surface of steel ingot |
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Assignee: Pangang Group Chengdu steel vanadium Co., Ltd. Assignor: Pangang Group Chengdu Iron & Steel Co., Ltd Contract fulfillment period: 2009.11.24 to 2015.11.24 contract change Contract record no.: 2009510000174 Denomination of invention: Killed steel casting method Granted publication date: 20090527 License type: Exclusive license Record date: 20091130 |
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