CN108796348A - A kind of smelting process of high-carbon aluminum killed steel - Google Patents
A kind of smelting process of high-carbon aluminum killed steel Download PDFInfo
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- CN108796348A CN108796348A CN201810587303.6A CN201810587303A CN108796348A CN 108796348 A CN108796348 A CN 108796348A CN 201810587303 A CN201810587303 A CN 201810587303A CN 108796348 A CN108796348 A CN 108796348A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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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
- 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
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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Abstract
A kind of smelting process of high-carbon aluminum killed steel, including converter, refining and continuous casting working procedure, the converter procedure：Molten steel terminal C content is controlled in >=0.25wt%, and ensures to control 0.010% or more before Al packets in steel；The refining procedure：Using LF+RH techniques, forbid Calcium treatment during refining；After RH application of vacuum, ladle soft blow 15 minutes or more, then molten steel time of repose 20~30 minutes；Ensure outbound Al controls 0.025% or more；The continuous casting working procedure：5~10kg ferrosilicon powder exothermic mixtures are placed respectively in 1 stream of middle packet and 8 stream stopper bottom the rim of a bowl positions before cast, each stream uses the casting speed control i.e. 1 of differentiation to flow, 8 stream pulling rates is 1.0~1.05m/min, 2 streams, 7 streams are 0.95~0.98m/min, 3 streams, 6 streams are 0.93~0.95m/min, and 4 streams, 5 streams are 0.88~0.90m/min.The abundant floating that is mingled with and ensure that field trash is effectively reduced, to effectively improve the degree of purity of molten steel.Have many advantages, such as of low cost, easy to operate, applied widely under conditions of not changing existing tundish structure, raising casting sequence and strand recovery rate.
Description
Technical field
The present invention relates to a kind of method for making steel, especially a kind of smelting process of high-carbon aluminum killed steel.
Background technology
The carbon content of high-carbon aluminum killed steel is in 0.95wt% or more, and aluminium content is in 0.02wt%~0.05wt%.In deoxidation process
It is middle to generate a large amount of dystectic Al2O3Non-metallic inclusion, Molten Steel Cleanliness are not easy to control.It is typically to use in the prior art
Calcium treatment is by dystectic Al2O3It is changed into the method for low melting point calcium aluminate, but the risk of D or DS type impurities can be increased.Simultaneously
The high liquidus temperature of carbon content of high-carbon aluminum killed steel itself is relatively low（1455℃）, the factor of conticaster initial designs, 8 machines 8 stream
Single tundish it is long and narrow, molten steel flows through that the 1st of tundish the, 8 stream both wings paths are long, and temperature ratio is flowed on both wings side after continuous casting is opened and poured
It is other to flow down the fast of drop, there is Metal in Tundish and opening the phenomenon that pouring generation low temperature knot stream shortly after in the 1st or the 8th stream, causes
The molten steel of the other streams time of tundish gradually stops, and occurs to be forced to stop pouring after conticaster pours into a mould 1~2 heat, the accidents such as molten steel melts down.
Solve the problems, such as that the usual way is optimization tundish structure, the facilities such as inside addition slag blocking wall, dam reach molten steel between each stream
Flowing synchronism.Not only increase the cost consumption of refractory material in this way, and these refractory materials are by tundish molten steel
High temperature erosion, the degree of purity of molten steel can also be brought a negative impact.
Invention content
The technical problem to be solved in the present invention is to provide a kind of smeltings of effective high-carbon aluminum killed steel for promoting Molten Steel Cleanliness
Smelting method.
In order to solve the above technical problems, the present invention includes converter, refining and continuous casting working procedure, the converter procedure：Molten steel is whole
Point C content control is in >=0.25wt%；
The refining procedure：Using LF+RH techniques；Forbid Calcium treatment during refining；After RH application of vacuum, ladle soft blow 15 divides
Clock or more, then molten steel time of repose 20~30 minutes；
The continuous casting working procedure：5~10kg ferrosilicon powders hair is placed respectively in 1 stream of middle packet and 8 stream stopper bottom the rim of a bowl positions before cast
Thermit powder.
Continuous casting working procedure of the present invention：Single tundish and the casting speed control of differentiation are flowed using 8 machines 8；1 stream, 8 stream pulling rates are
1.0~1.05m/min, 2 streams, 7 streams are 0.95~0.98m/min, and 3 streams, 6 streams are 0.93~0.95m/min, and 4 streams, 5 streams are
0.88~0.90m/min.
In converter procedure of the present invention, Al content control is in >=0.010wt% before LF process seat packets.
In refining procedure of the present invention, Al >=0.025wt%, S≤0.005wt% in outbound molten steel.
It is using advantageous effect caused by above-mentioned technical proposal：Converter procedure of the present invention ensures terminal using highcasting speed
C >=0.25% effectively controls the free oxygen content of molten steel, while once mending aluminium with aluminium ingot deoxidation and refining period during tapping and reaching
To target component so that the deoxidation Al of formation2O3The condition that product early stage fully floats；Forbid Calcium treatment during refining, prevents
Saturated vapour pressure height causes that secondary oxidation of steel forms new refractory oxide and CaS is mingled with during Calcium treatment, in causing
Between water-coating port blocking；The molten steel time of repose increased after RH application of vacuum is to be brought in refining cyclic process in molten steel
The field trash of bottom molten steel fully floats, and is further ensured that the degree of purity of molten steel；The effect of siliceous exothermic mixture is during heat release is conducive to
Between Baogang's water open casting operation；The abundant floating that is mingled with and ensure that field trash is thus effectively reduced, to effectively carry
The degree of purity of molten steel is risen.
For the present invention during pouring steel, the 1st to the 8th stream uses different casting, mainly from intermediate bound edge stream molten steel path length,
It causes side stream temperature drop comparatively fast to consider than intermediate flow, reduces this otherness.This makes the 1st and the 8th of tundish edge to flow
The temperature difference is maintained at 3~5 DEG C between the 3rd stream of centre and the 4th stream, under the premise of ensureing quality strand, can smoothly complete 5~10 stoves
Company pours；Reduce high temperature erosion of the refractory material by tundish molten steel, improves the degree of purity of molten steel；This casting method tool
Have under conditions of not changing existing tundish structure, have it is of low cost, easy to operate, applied widely, improve even pours stove
The advantages that number and strand recovery rate.
Specific implementation mode
The present invention will be further described in detail with reference to the specific embodiments.
The smelting process of this high-carbon aluminum killed steel includes converter procedure, refining procedure（LF+RH）, continuous casting working procedure, each process
Technique is：（1）Converter procedure：The control of molten steel terminal C content is in >=0.25wt% and Al content control before ensureing LF process seat packets
System requires to control in >=0.010wt%, other compositions according to job instruction.
（2）Refining procedure（LF+RH）：Outbound Al controls are in >=0.025wt%, S≤0.005wt%, and other compositions are according to work
Industry guiding book requires control, mends aluminium operation and requires to complete before LF refining mid-term；Forbid Calcium treatment during refining；RH application of vacuum
Later, ensure ladle soft blow 15 minutes or more, increase molten steel time of repose 20~30 minutes.
（3）Casting process：Single tundish is flowed using 8 machines 8, using mouth of a river integral water gap.Middle hired car in place arrange by rear argon gas
After sky, 5~10kg ferrosilicon powder exothermic mixtures are placed respectively in 1 stream of middle packet and 8 stream stopper bottom the rim of a bowl positions, other are advised according to operation
Range request.It unwraps and pours in tissue, first open the 4th, 5 streams, after pulling rate stabilization, then open pour successively to the 1st and the 8th side stream successively；No
For cocurrent flow time using the casting speed control of differentiation, 1 stream, 8 streams use 1.0~1.05m/min, 2 streams, 7 streams to use 0.95~0.98m/
Min, 3 streams, 6 streams use 0.93~0.95m/min, 4 streams, 5 streams to use 0.88~0.90m/min.Pulling rate is adjusted by differentiation,
The molten steel temperature difference that tundish is measured in each stream time position is set to be less than 3 DEG C, tundish is maintained in steel pouring process temperature drop within 15 DEG C
（Except first packet）.Under the premise of ensureing strand low multiple quality, the direct casting of 5~10 heat of single tundish is smoothly realized.
Embodiment 1：The smelting process of this high-carbon aluminum killed steel uses following concrete technologies.
（1）Some pours secondary, conticaster section 200mm*200mm to the high-carbon aluminum killed steel that production steel grade is GCr15A-B2,
Primary chemical（Melting）The standard of ingredient requires（wt）：C 0.95%~1.05%, Si 0.15%~0.35%, Mn 0.25%~
0.45%, P≤0.020%, S≤0.020%, Cr 1.40%~1.64%, Al≤0.050%, wherein surplus are for Fe and inevitably
Impurity.
（2）Converter procedure：The control of molten steel terminal C content is in >=0.25wt% and Al content control before ensureing LF process seat packets
System requires to control in >=0.010wt%, other compositions according to job instruction；Endpoint carbon content of converter is shown in Table 1.
Table 1：Converter terminal carbon (wt%)
（3）LF refining process：Each heat of molten steel enters the station 1490~1520 DEG C of temperature-measuring range, feeding temperature-raising slag making in 15~20 minutes,
Enter the station sample and thermometric, 1530~1555 DEG C of temperature range is taken with addition of ferroalloy and to be fed according to the first sample ingredient at LF after white slag
Corresponding aluminum steel, then power transmission take 1587~1609 DEG C of second appearance and thermometric for 20 minutes, carry out composition adjustment again, when refining
Between 50~60 minutes adjustment after the completion of 1587~1605 DEG C of thermometric it is outbound arrive RH stations；LF refining ingredient out of the station is shown in Table 2, wherein
Surplus is Fe and inevitable impurity.
Table 2：LF refining ingredient out of the station (wt%)
4）RH vacuum refining processes：Molten steel enters the station 1585~1600 DEG C of thermometric, after molten steel seat to vacuum, opens vacuum pump, connects
Logical argon gas, after reaching condition of high vacuum degree（< 100pa）, the circulating degasification phase is carried out, is ensured at 10 minutes or more.Thermometric takes after broken sky
Sample adds aluminum steel and the other ingredients of fine tuning according to ingredient, forbids Calcium treatment, ingredient is returned and then adjustment argon flow amount, soft
It blows 15 minutes, 1515~1540 DEG C of thermometric, closes argon gas and enter the standing phase, time of repose 25 minutes hangs ladle to continuous casting；RH goes out
Ingredient of standing is shown in Table 3, and wherein surplus is Fe and inevitable impurity.
Table 3：The outbound ingredients of RH (wt%)
（5）Continuous casting working procedure：Single tundish is flowed using 8 machines 8, using mouth of a river integral water gap.After molten steel seat to bale panoramic tables, dry
Baked tundish is in place, and middle hired car after rear argon gas emptying, is placed in place at brick cup the rim of a bowl position of the 1st and the 8th stream of middle packet
The ferrosilicon powder of 5kg is unwrapped pour greatly after argon gas empties 3min, and in tundish molten steel face, height reaches 250mm and adds slag absorbing agent 20
Then bag adds 20 bags of thermal-insulating covering agent, all standing of tundish molten steel face again.After tundish molten steel face reaches 350mm, tissue pours steel
Work, which is opened, to be poured, and is opened stream and is first opened intermediate 4,5 liang of stream, pulling rate is opened to the 1st and the 8th stream of two sides stream after stablizing and poured successively successively again.It draws
1 stream of speed, 8 streams use 1.0m/min；2,7 streams use 0.95m/min；3,6 streams use 0.93m/min；4,5 streams use 0.90m/
min.The ingredient of finished product GCr15A-B2 steel is shown in Table 4 after continuous casting, and wherein surplus is Fe and inevitable impurity.
Table 4：Finished product ingredient (wt%)
（6）Above-mentioned continuous casting working procedure not only reduces the degree of superheat after taking difference to control each stream poring rate measure（1486~1492
℃）, and smoothly realize that the company for completing 10 heats pours.The degree of superheat between each stream time（Temperature measurer measures）Casting process is surveyed with hand-held
Wen Yi is near the 1st, 4,8 stream stopper holes, and per heat, the molten steel of casting mid-term carries out thermometric, and temperature-measuring results are shown in Table 5.
Table 5：1st, 4,8 stream stopper hole liquid steel temperatures
Embodiment 2：The smelting process of this high-carbon aluminum killed steel uses following concrete technologies.
（1）Producing steel grade GCr15-A, some pours secondary, conticaster section 200mm*200mm, primary chemical（Melting）Ingredient
Standard require be（wt）：C 0.95%~1.05%, Si 0.15%~0.35%, Mn 0.25%~0.45%, P≤0.020%, S≤
0.020%, Cr 1.40%~1.64%, Al≤0.050%, wherein surplus are Fe and inevitable impurity.
（2）Converter procedure：Molten steel terminal C content control Al content in >=0.25wt% and before ensureing LF process seat packets
Control requires to control in >=0.010wt%, other compositions according to job instruction；Endpoint carbon content of converter is shown in Table 6.
Table 6：Converter terminal carbon (wt%)
（3）LF refining process：Each heat of molten steel enters the station 1486~1528 DEG C of temperature-measuring range, feeding temperature-raising slag making in 15~20 minutes,
Enter the station sample and thermometric, 1530~1565 DEG C of temperature range is taken with addition of ferroalloy and to be fed according to the first sample ingredient at LF after white slag
Corresponding aluminum steel, then power transmission take 1577~1616 DEG C of second appearance and thermometric for 20 minutes or so, carry out composition adjustment again, essence
1590~1612 DEG C of thermometric is outbound to RH stations after the completion of refining the adjustment of 50~60 minutes time.LF refining ingredient out of the station is shown in Table 7,
Wherein surplus is Fe and inevitable impurity.
Table 7：LF refining ingredient out of the station (wt%)
（4）RH vacuum refining processes：Molten steel enters the station 1585~1602 DEG C of thermometric, after molten steel seat to vacuum, opens vacuum pump, connects
Logical argon gas, after reaching condition of high vacuum degree（< 100pa）, the circulating degasification phase is carried out, is about ensured at 10 minutes or more.Broken empty survey later
Temperature sampling adds aluminum steel and the other ingredients of fine tuning according to ingredient, forbids Calcium treatment.Ingredient is returned and then adjustment argon gas stream
Amount, soft blow 20 minutes, 1515~1540 DEG C of thermometric close argon gas and enter the standing phase, and time of repose 20 minutes hangs ladle to even
Casting.The outbound ingredients of RH are shown in Table 8, and wherein surplus is Fe and inevitable impurity.
Table 8：The outbound ingredients of RH (wt%)
（5）Continuous casting working procedure：Single tundish is flowed using 8 machines 8, using mouth of a river integral water gap.After molten steel seat to bale panoramic tables, dry
Baked tundish is in place, and middle hired car after rear argon gas emptying, flows stopper bottom the rim of a bowl positions in 1 stream of middle packet and 8 and put respectively in place
It sets 10kg ferrosilicon powder exothermic mixtures to unwrap pour greatly after argon gas empties 3min, in tundish molten steel face, height reaches 250mm and adds suction
Then 20 bags of slag agent adds 20 bags of thermal-insulating covering agent, all standing of tundish molten steel face again.After tundish molten steel face reaches 350mm, group
It knits to pour steel work and open and pour, open stream and first open intermediate 4,5 liang of stream, pulling rate is opened to the 1st and the 8th stream of two sides stream successively successively again after stablizing
It pours.The stream of pulling rate 1,8 streams use 1.02m/min；2,7 streams use 0.98m/min；3,6 streams use 0.95m/min；4,5 streams use
0.88m/min.The ingredient of finished product GCr15 steel is shown in Table 9 after continuous casting, and wherein surplus is Fe and inevitable impurity.
Table 9：Finished product ingredient (wt%)
（6）Above-mentioned continuous casting working procedure not only reduces the degree of superheat after taking difference to control each stream poring rate measure（1486~1512
℃）, and smoothly realize that the company for completing 9 heats pours.The degree of superheat between each stream time（Temperature measurer measures）Casting process is surveyed with hand-held
Wen Yi is near the 1st, 4,8 stream stopper holes, and per heat, the molten steel of casting mid-term carries out thermometric, and temperature-measuring results are shown in Table 10.
Table 10：1st, 4,8 stream stopper hole liquid steel temperatures
Embodiment 3：The smelting process of this high-carbon aluminum killed steel uses following concrete technologies.
（1）Producing steel grade GCr15, some pours secondary, conticaster section 200mm*200mm, primary chemical（Melting）Ingredient
Standard requires（wt）：C 0.95%~1.05%, Si 0.15%~0.35%, Mn 0.25%~0.45%, P≤0.020%, S≤
0.020%, Cr 1.40%~1.64%, Al≤0.050%, wherein surplus are Fe and inevitable impurity.
（2）Converter procedure：Molten steel terminal C content control Al content in >=0.25wt% and before ensureing LF process seat packets
Control requires to control in >=0.010wt%, other compositions according to job instruction；Endpoint carbon content of converter is shown in Table 11.
Table 11：Converter terminal carbon (wt%)
（3）LF refining process：Each heat of molten steel enters the station 1466~1538 DEG C of temperature-measuring range, and feeding temperature-raising is made for 15~20 minutes simultaneously
Slag takes enter the station sample and thermometric, 1540~1558 DEG C of temperature range with addition of ferroalloy and to be fed according to the first sample ingredient at LF after white slag
Enter corresponding aluminum steel, then power transmission takes 1569~1621 DEG C of second appearance and thermometric for 20 minutes or so, carries out composition adjustment again,
1585~1640 DEG C of thermometric is outbound after the completion of refining time adjustment in 50~60 minutes arrives RH stations.LF refining ingredient out of the station is shown in Table
12, wherein surplus is Fe and inevitable impurity.
Table 12：LF refining ingredient out of the station (wt%)
（4）RH vacuum refining processes：Molten steel enters the station 1585~1637 DEG C of thermometric, after molten steel seat to vacuum, opens vacuum pump, connects
Logical argon gas, after reaching condition of high vacuum degree（< 100pa）, the circulating degasification phase is carried out, is about ensured at 10 minutes or more.Broken empty survey later
Temperature sampling adds aluminum steel and the other ingredients of fine tuning according to ingredient, forbids Calcium treatment.Ingredient is returned and then adjustment argon gas stream
Amount, soft blow 18 minutes, 1519~1540 DEG C of thermometric close argon gas and enter the standing phase, and time of repose 30 minutes hangs ladle to even
Casting.The outbound ingredients of RH are shown in Table 13, and wherein surplus is Fe and inevitable impurity.
Table 13：The outbound ingredients of RH (wt%)
（5）Continuous casting working procedure：Single tundish is flowed using 8 machines 8, using mouth of a river integral water gap.After water seat to bale panoramic tables, baking
Good tundish is in place, and in place after rear argon gas emptying, steel flows stopper bottom the rim of a bowl positions in 1 stream of middle packet and 8 to be put middle hired car respectively
It sets 8kg ferrosilicon powder exothermic mixtures to unwrap pour greatly after argon gas empties 3min, in tundish molten steel face, height reaches 250mm and adds slag absorbing
Then 20 bags of agent adds 20 bags of thermal-insulating covering agent, all standing of tundish molten steel face again.After tundish molten steel face reaches 350mm, tissue
It pours steel work and opens and pour, open stream and first open intermediate 4,5 liang of stream, pulling rate is opened to the 1st and the 8th stream of two sides stream successively successively again after stablizing
It pours.The stream of pulling rate 1,8 streams use 1.05m/min；2,7 streams use 0.96m/min；3,6 streams use 0.94m/min；4,5 streams use
0.89m/min.The ingredient of finished product GCr15 steel is shown in Table 14 after continuous casting, and wherein surplus is Fe and inevitable impurity.
Table 14：Finished product ingredient (wt%)
（6）Above-mentioned continuous casting working procedure not only reduces the degree of superheat after taking difference to control each stream poring rate measure（1480~1516
℃）, and smoothly realize that the company for completing 10 heats pours.The degree of superheat between each stream time（Temperature measurer measures）Casting process is surveyed with hand-held
Wen Yi is near the 1st, 4,8 stream stopper holes, and per heat, the molten steel of casting mid-term carries out thermometric, and temperature-measuring results are shown in Table 15.
Table 15：1st, 4,8 stream stopper hole liquid steel temperatures
Claims (4)
1. a kind of smelting process of high-carbon aluminum killed steel comprising converter, refining and continuous casting working procedure, which is characterized in that described turn
Furnaceman's sequence：Molten steel terminal C content is controlled in >=0.25wt%；
The refining procedure：Using LF+RH techniques；Forbid Calcium treatment during refining；After RH application of vacuum, ladle soft blow 15 divides
Clock or more, then molten steel time of repose 20~30 minutes；
The continuous casting working procedure：5~10kg ferrosilicon powders hair is placed respectively in 1 stream of middle packet and 8 stream stopper bottom the rim of a bowl positions before cast
Thermit powder.
2. a kind of smelting process of high-carbon aluminum killed steel according to claim 1, which is characterized in that the continuous casting working procedure：
Single tundish and the casting speed control of differentiation are flowed using 8 machines 8；1 stream, 8 stream pulling rates are 1.0~1.05m/min, and 2 streams, 7 streams are
0.95~0.98m/min, 3 streams, 6 streams are 0.93~0.95m/min, and 4 streams, 5 streams are 0.88~0.90m/min.
3. a kind of smelting process of high-carbon aluminum killed steel according to claim 1, it is characterised in that：The converter procedure
In, Al content control is in >=0.010wt% before LF process seat packets.
4. a kind of smelting process of high-carbon aluminum killed steel according to claim 1,2 or 3, it is characterised in that：The refining
In process, Al >=0.025wt%, S≤0.005wt% in outbound molten steel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112475255A (en) * | 2020-11-18 | 2021-03-12 | 山西太钢不锈钢股份有限公司 | Continuous casting production method of high-aluminum ferrite stainless steel |
| CN113290216A (en) * | 2021-06-07 | 2021-08-24 | 西峡龙成冶金材料有限公司 | Casting slag for stainless steel continuous casting and application thereof |
| CN114273649A (en) * | 2021-12-31 | 2022-04-05 | 北京瑞普同创科技发展有限公司 | Casting process of sizing quick-change tundish |
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| CN114273649A (en) * | 2021-12-31 | 2022-04-05 | 北京瑞普同创科技发展有限公司 | Casting process of sizing quick-change tundish |
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