CN114643340B - Method for producing high-carbon high-manganese wear-resistant steel continuous casting blank by straight arc slab caster - Google Patents
Method for producing high-carbon high-manganese wear-resistant steel continuous casting blank by straight arc slab caster Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 102
- 239000010959 steel Substances 0.000 title claims abstract description 102
- 239000011572 manganese Substances 0.000 title claims abstract description 51
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 48
- 238000009749 continuous casting Methods 0.000 title claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 claims abstract description 61
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 238000005204 segregation Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 66
- 239000002893 slag Substances 0.000 claims description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000003825 pressing Methods 0.000 claims description 21
- 239000000498 cooling water Substances 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 238000006424 Flood reaction Methods 0.000 claims description 7
- 238000005336 cracking Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 230000032798 delamination Effects 0.000 abstract 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 8
- 230000007547 defect Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 235000011837 pasties Nutrition 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 235000013372 meat Nutrition 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 208000029154 Narrow face Diseases 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/043—Curved moulds
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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
- 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
-
- 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
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The invention relates to the field of metallurgy, in particular to a method for producing a high-carbon high-manganese wear-resistant steel continuous casting blank by a straight arc slab caster. A method for producing high-carbon high-manganese wear-resistant steel continuous casting billets by a straight arc slab caster comprises the following steps: (1) solve the problem of casting blank overall length and longitudinal crack. And (2) solving the problem of casting bonding steel leakage. (3) Solves the problem of brittle failure of the extruded molten steel and the shell of the tail billet when the tail billet is capped. (4) solving the problem of center segregation and center delamination after rolling. The invention breaks through the technology of producing high-carbon high-manganese wear-resistant steel by the traditional injection molding process, improves the yield and reduces the production cost.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for producing a high-carbon high-manganese wear-resistant steel continuous casting blank by a straight arc slab caster.
Background
Austenitic high manganese steels were invented by the Robert Hadfield mr. In 1882 and have high strength, high toughness, high elongation, no magnetic properties, excellent wear resistance, and cold hardening properties during use. At present, the ball-blasting machine is widely applied to the parts which are easy to be worn by strong impact, such as shot blasting machines, ball mills, disintegrators, safes, bullet-proof vehicles and the like.
At present, a die casting process is mainly adopted to produce high-carbon high-manganese wear-resistant steel castings or steel ingots at home, and finally the steel castings or steel ingots are rolled into the finished products, but the finished products are low in rate, poor in internal quality and high in production cost when the die casting process is used for production. The continuous casting process is not mature in the process of producing the high-carbon high-manganese wear-resistant steel.
The C, mn alloy of the high-carbon high-manganese wear-resistant steel is large, columnar crystals are developed when the carbon content in the steel is higher than 1% and the manganese content is higher than 12%, coarse crystals and cracks tend to be formed, meanwhile, the liquidus temperature is low in the solidification process, the heat transfer speed is low when the liquid phase changes to the solid phase, the solidification sensible heat is large, and the heat transfer speed is high after the steel is completely solidified to the solid phase, the casting blank temperature is reduced rapidly, and the like. The steel grade is produced by using the straight arc slab caster, the problems of open casting bonding steel leakage, casting blank through length longitudinal crack, tail blank capping difficulty, layering after rolling caused by serious center carbon segregation and the like are easy to occur, the problems are the difficulty of restricting the production of the steel grade by the straight arc slab caster, and the method for solving the problems when the straight arc slab caster produces the steel grade is rarely reported at present.
Chinese patent CN 103273023 A,2013.06.07, a continuous casting production process of extra-high manganese steel, solves the problem of smooth casting of high alloy steel with carbon content of about 0.60% and manganese content of about 20% by reducing the internal temperature drop of the first molten steel in a tundish, reducing the internal temperature drop of the first molten steel in a crystallizer and preventing the shell of the inner blank of the crystallizer from breaking. The method for producing the high manganese steel has the risk of gate blocking and gate breaking of cold steel with low ladle temperature during casting, and the castability of molten steel is reduced, so that the accident risk is increased.
Chinese patent CN 102423795 B,2013.08.28, a continuous casting method of high manganese steel, develops a process for continuously casting a slab of high manganese steel with a C content of 0.02-0.15% and a Mn content of 2.0-15.0% by optimizing an electromagnetic stirring process, a tundish temperature process, a secondary cooling water process, a drawing speed process, a slag charge process and a long nozzle protection casting process of a slab caster, and simultaneously avoids the defects of no cracks, heavy skin and welding slag on the surface of a continuous casting slab. The method can only produce high manganese steel with the C content of 0.02-0.15 percent, and cannot realize continuous casting production of high-carbon high-manganese wear-resistant steel with the C content of 1.0 percent.
Chinese patent CN 104550790 A,2015.04.29, a production method of continuous casting of medium manganese wear-resistant steel slab, the method controls the superheat degree of molten steel in the tundish at 25-32 ℃; the secondary cooling intensity is controlled to be 0.1-0.6L/kg; meanwhile, the continuous casting speed is controlled, and the method is suitable for the continuous casting process of the medium-manganese wear-resistant steel (high-manganese wear-resistant steel with the Mn content of less than 13%) slab, and can effectively reduce the longitudinal crack defect of the medium-manganese wear-resistant steel. The method can not be used for producing the high-manganese wear-resistant steel continuous casting slab with the Mn content of 13 percent.
Chinese patent CN 104001880 B,2016.05.25 is a high manganese steel straight arc slab continuous casting method, and produces qualified high alloy steel continuous casting slabs with manganese content of 8.0% by optimizing a tundish molten steel temperature process, covering slag performance, an electromagnetic stirring process, a primary cooling water process and a secondary cooling water process. The method can not solve the problems of casting-on steel leakage, blank casting off at the top end and casting blank longitudinal cracking existing in the process of producing high-carbon high-manganese wear-resistant steel by a straight arc continuous casting machine.
Chinese patent CN 109112418 A,2020.09.01, a continuous casting method of high manganese steel, by optimizing two-cooling section two-mode water supply process, the first mode adopts weak cooling water line, specific water amount is 0.15-0.25L/kg, the second mode is that the last two area nozzles of the casting machine are closed, and the process of producing high manganese steel with C content of 0.21-0.25% and Mn content of 4.5-5.5% by using bloom continuous casting machine is developed. The invention is suitable for the production process of large square billet continuous casting machines and is not suitable for the continuous casting process of straight arc-shaped plate billets.
In order to improve the yield and reduce the production cost, the invention provides a slab continuous casting method for producing high-carbon high-manganese wear-resistant steel by adopting a straight arc continuous casting machine instead of a die casting process, and solves the problems of casting sticking and steel leakage, continuous longitudinal crack of a casting blank, difficult capping of a tail blank and the like when the straight arc slab continuous casting machine is used for producing the steel.
Disclosure of Invention
The invention aims at solving the problems and provides a method for producing high-carbon high-manganese wear-resistant steel continuous casting billets by a straight arc slab caster.
The purpose of the invention is realized in the following way: a method for producing high-carbon high-manganese wear-resistant steel continuous casting billets by a straight arc slab caster comprises the following steps:
(1) Solves the problem of casting blank through length longitudinal cracking, and comprises the following specific steps:
1) The taper of the crystallizer is 1.20 to 1.30 percent,
2) The pulling speed is 0.7-1.0 m/min,
3) The temperature of the tundish is 1425-1445 ℃,
4) A cold water volume wide surface 3300-3500L/min and a narrow surface 380-430L/min,
5) The specific water quantity of the secondary cooling water is 0.4-0.5L/min,
6) The main components of the covering slag are as follows by weight percentThe method comprises the following steps: caO content 26+ -3%, siO 2 33+ -3% of the content, 5.2+ -1.0% of TC, 11.0+ -2.5% of F, and physicochemical indexes of the covering slag: basicity 0.80+ -0.06, melting point 1030+ -30deg.C, viscosity 0.10+ -0.03Pa.s;
(2) Solves the problem of casting bonding steel leakage, and comprises the following specific steps:
1) The cold material is put in when the dummy ingot is blocked: the spreading thickness of the nail scraps is 8-10 mm, 12-15 springs are placed,
2) The seedling emergence time is 70-80 s, 8-10 kg of casting powder is added when the molten steel floods the spring, the casting powder is pushed into the side hole of the submerged nozzle,
3) When the liquid level of molten steel is 120-140 mm away from the upper edge of the copper plate, starting a withdrawal and straightening machine, the starting withdrawal speed is 0.2-0.25 m/min,
4) And (3) speed increasing operation: the speed is increased to 0.3-0.4 m/min for 30-50 s at 0.2-0.25 m/min, then the speed is increased by 0.1-0.2 m/min every 1-1.5 min, the speed increasing slope is 0.5+/-0.05 m/min,
5) The ladle temperature in the casting heat is 1435-1445 ℃,
6) After starting, using a slag picking rod to measure the travelling condition of the blank shell, confirming whether the blank shell is adhered, and immediately stopping the machine for 10-20 s for restarting if the blank shell is adhered;
(3) Solves the problems of extrusion of molten steel from the capping of the tail billet and brittle fracture of the billet shell, and comprises the following specific steps:
1) When the molten steel in the tundish is remained at the height of 200-300 mm, the pulling speed is reduced from 0.8-1.0 m/min to 0.5-0.6 m/min,
2) The slag is fished at the two sides of the water gap by using slag scooping rakes, the thickness of a slag layer after slag scooping is less than 10mm,
3) When the molten steel in the tundish is 100-150 mm high, the pulling speed is directly reduced from 0.5-0.6 m/min to 0.1+/-0.02 m/min,
4) Continuously water is sprayed to the wall of the crystallizer by using a water pipe to cool the tail blank until the tail blank is discharged out of the lower opening of the crystallizer,
5) The slag blocks on the upper part of the tail blank are fished out by using slag scooping rakes,
6) The pulling speed is maintained at 0.1-0.2 m/min for 2-3 min, then the pulling speed is increased by 0.3-0.4 m/min,
7) The pulling speed is maintained at 0.3-0.4 m/min for 2-3 min, then the pulling speed is increased by 0.5-0.6 m/min,
8) The speed of the tail blank is increased by 0.8-0.9 m/min after the tail blank is discharged out of the crystallizer, the speed is increased by 1.2-1.3 m/min after the tail blank is maintained for 1-1.5 min, the tail blank is rapidly output,
9) The method requires that the retention time of the tail billet in a crystallizer is less than 4min, the total time of the pulling speed is less than 0.5m/min is less than 7min, the billet tail is rapidly cooled by water at a low pulling speed, the solidification of the billet tail is accelerated, the temperature of a casting blank in a casting machine is ensured, and longitudinal cracking or brittle fracture of the billet tail is avoided;
(4) The method solves the problems of center segregation and center layering after rolling, and comprises the following specific steps:
1) The electromagnetic stirring adopts 400+/-50A current and 5-8 Hz frequency, 15-25 s reversing process,
2) The dynamic soft pressing adopts a special pressing process, and the pressing amount of the paste area is increased from 1.7-1.9 mm to 2.3-2.5 mm.
The high-carbon high-manganese wear-resistant steel comprises the following chemical components in percentage by weight: 0.9 to 1.2 percent of C, 11.0 to 14.0 percent of Mn, 0.3 to 0.8 percent of Si, less than 0.035 percent of P, less than 0.030 percent of S, 0.60 to 1.50 percent of Cr, and the balance of Fe and unavoidable impurity elements.
The high-carbon high-manganese steel continuous casting slab has the specification that: 200-250 mm thick, 1000-1500 mm wide and 3000-12000 mm long.
The beneficial effects of the invention are as follows: the invention breaks through the technology of producing high-carbon high-manganese wear-resistant steel by the traditional injection molding process, improves the yield and reduces the production cost. By developing the processes of primary cooling water, secondary cooling water, taper, covering slag and the like, the problem of longitudinal crack of the continuous casting billet of the high-manganese wear-resistant steel produced by the straight arc continuous casting machine is solved. By developing the operation of blocking dummy ingot and the casting accelerating process, the problem of casting bonding steel leakage is solved. By developing the tail billet capping operation process, the problem of brittle failure of the billet shell in the extrusion molten steel and the secondary cooling chamber during capping is solved. By optimizing the electromagnetic stirring and dynamic soft reduction process, the center segregation of the casting blank is reduced, and the center layering problem after rolling is solved. By adopting the measures, the process for producing the high-carbon high-manganese wear-resistant steel defect-free continuous casting blank by the straight arc continuous casting machine is successfully invented. Compared with the traditional injection molding process, the method greatly improves the yield and reduces the production cost.
The invention solves the technical problems of casting blank longitudinal crack, casting leakage, difficult capping, tight center segregation of casting blank and the like existing in the process of producing high-carbon high-manganese wear-resistant steel by a straight arc continuous casting machine.
Detailed Description
A method for producing high-carbon high-manganese wear-resistant steel continuous casting billets by a straight arc slab caster solves the problem of continuous length and longitudinal crack when the straight arc slab caster produces high-manganese wear-resistant steel continuous casting billets by developing a process of primary cooling water, secondary cooling water, taper and covering slag. By developing the operation of blocking dummy ingot and the casting accelerating process, the problem of casting bonding steel leakage is solved. By developing the tail blank capping operation, the problem that the tail shell of the secondary cooling chamber is brittle due to slow solidification of a liquid core, easy extrusion of molten steel and long low pulling speed during capping is solved. By optimizing the electromagnetic stirring and dynamic soft reduction process, the center segregation of the casting blank is reduced, and the center layering problem after rolling is solved.
The high-carbon high-manganese wear-resistant steel comprises the following chemical components in percentage by weight: 0.9 to 1.2 percent of C, 11.0 to 14.0 percent of Mn, 0.3 to 0.8 percent of Si, less than 0.035 percent of P, less than 0.030 percent of S, 0.60 to 1.50 percent of Cr, and the balance of Fe and unavoidable impurity elements.
Crystallizer taper 1.25%; the temperature of the tundish is 1425-1445 ℃; the specific water content of the secondary cooling water is 0.4-0.5L/min; basicity of the covering slag is 0.80+/-0.06, and melting point is 1030+/-30 ℃; the viscosity was 0.10.+ -. 0.03Pa.s.
When the dummy ingot is blocked, a proper amount of cold material is put in, the nail scraps are spread with the thickness of 8-10 mm, and 12-15 springs are placed. The seedling emergence time is 70-80 s, 10kg of casting powder is added when the molten steel floods the spring, and the casting powder is pushed when the side hole of the water gap is submerged. The starting pulling speed is 0.2m/min, the pulling speed is increased to 0.3m/min after the pulling speed is maintained for 30 seconds, then the pulling speed is increased by 0.1m/min every 1min, and the increasing speed slope is 0.5m/min.
When the tail blank is capped, the pulling speed is reduced from 0.8m/min to 0.5m/min, slag is fished out at two sides of the water gap by using slag scooping-out rakes, and the thickness of a slag layer after slag scooping-out is less than 10mm. When the height of molten steel in the tundish is 100mm, the pulling speed is directly reduced from 0.5m/min to 0.1m/min. The tail blank is cooled by continuously watering the wall of the crystallizer by using a water pipe. After confirming that the tail blank is well solidified, the speed-up gradient is that the pulling speed is maintained at 0.1m/min for 2min, then the pulling speed is increased by 0.3m/min, the pulling speed is maintained at 0.3m/min for 2min, then the pulling speed is increased by 0.5m/min, the tail blank is increased by 0.8m/min after being discharged from the crystallizer, and the pulling speed is increased by 1.2m/min after being maintained for 1min, so that the tail blank is rapidly output.
The retention time of the tail blank in the crystallizer is less than 4min, and the total time of the pulling speed in the capping process is less than 0.5m/min and less than 7min.
The electromagnetic stirring adopts 400A current and 5Hz frequency, and 15s reversing process. The dynamic soft pressing adopts a special pressing process, and the pressing amount of the pasty area is 2.3mm.
The technical scheme adopted by the invention is as follows: the high-carbon high-manganese wear-resistant steel comprises the following chemical components in percentage by weight: 0.9 to 1.2 percent of C, 11.0 to 14.0 percent of Mn, 0.3 to 0.8 percent of Si, less than 0.035 percent of P, less than 0.030 percent of S, 0.60 to 1.00 percent of Cr, 0.05 to 0.15 percent of Mo, and the balance of Fe and unavoidable impurity elements. The high-carbon high-manganese steel continuous casting slab has the specification that: 200-250 mm thick, 1000-1500 mm wide and 3000-12000 mm long. The vertical-bending continuous casting machine comprises 1 straight arc section, 5 arc sections, 2 straightening sections and 4 horizontal sections.
(1) Solves the problem of casting blank through length longitudinal cracking, and comprises the following specific steps:
(1) the taper of the crystallizer is 1.25%.
(2) The pulling speed is 0.7-1.0 m/min.
(3) The temperature of the tundish is 1425-1445 ℃.
(4) A cold water amount wide surface 3400L/min and a narrow surface 415L/min.
(5) The specific water content of the secondary cooling water is 0.4-0.5L/min.
(6) The main components of the covering slag are as follows by weight percent: caO content 26+/-3%; siO (SiO) 2 The content is 33+/-3 percent; TC content 5.2+ -1.0%; f content is 11.0+ -2.5%. The main physical and chemical indexes of the covering slag are as follows: basicity is 0.80 plus or minus 0.06, and melting point is 1030 plus or minus 30 ℃; the viscosity was 0.10.+ -. 0.03Pa.s.
(2) Solves the problem of casting bonding steel leakage, and comprises the following specific steps:
(1) when the dummy ingot is blocked, a proper amount of cold material is put in, the nail scraps are spread with the thickness of 8-10 mm, and 12-15 springs are placed.
(2) The seedling emergence time is 70-80 s, 10kg of casting powder is added when the molten steel floods the spring, and the casting powder is pushed when the side hole of the water gap is submerged.
(3) When the liquid level of molten steel is 120-140 mm away from the upper edge of the copper plate, starting a withdrawal and straightening machine, and starting the withdrawal speed to be 0.2m/min.
(4) And (3) speed increasing operation: the speed is increased to 0.3m/min for 30s at 0.2m/min, then the speed is increased to 0.1m/min every 1min, and the speed increasing slope is 0.5m/min.
(5) The ladle temperature in the casting heat is 1435-1445 ℃.
(6) After starting, the traveling condition of the blank shell is measured by using a slag picking rod, whether the blank shell is adhered or not is confirmed, and if the blank shell is adhered, the blank shell is immediately stopped for 10 seconds and started again.
(3) Solves the problems of extrusion of molten steel from the capping of the tail billet and brittle fracture of the billet shell, and comprises the following specific steps:
(1) when the molten steel in the tundish is remained at the height of 200mm, the pulling speed is reduced from 0.8m/min to 0.5m/min.
(2) The slag is fished at the two sides of the water gap by using slag scooping, and the thickness of a slag layer after slag scooping is less than 10mm.
(3) When the height of molten steel in the tundish is 100mm, the pulling speed is directly reduced from 0.5m/min to 0.1m/min.
(4) And continuously water is sprayed to the wall of the crystallizer by using a water pipe to cool the tail blank until the tail blank is discharged out of the lower opening of the crystallizer.
(5) And (5) using a slag scooping scraper to scoop out the covering slag blocks on the upper part of the tail blank.
(6) The pulling rate of 0.1m/min was maintained for 2min, and then the pulling rate was increased by 0.3m/min.
(7) A pull rate of 0.3m/min was maintained for 2min and then a pull rate of 0.5m/min was increased.
(8) And (3) after the tail blank is discharged out of the crystallizer, the speed is increased by 0.8m/min, the speed is increased by 1.2m/min after the tail blank is maintained for 1min, and the tail blank is rapidly output.
(9) The method requires that the retention time of the tail blank in the crystallizer is less than 4min, and the total time of the pulling speed lower than 0.5m/min is less than 7min. And the blank tail is quickly watered and cooled at a low pulling speed, so that the solidification of the blank tail is accelerated, the temperature of a casting blank in a casting machine is ensured, and longitudinal cracking or brittle fracture and tearing of the blank tail are avoided.
(4) The method solves the problems of center segregation and center layering after rolling, and comprises the following specific steps:
(1) the electromagnetic stirring adopts 400A current and 5Hz frequency, and 15s reversing process.
(2) The dynamic soft pressing adopts a special pressing process, and the pressing amount of the pasty area is increased from 1.9mm to 2.3mm.
Example 1
1. Two furnaces of high carbon and high manganese wear resistant steel were produced by continuous casting using a straight arc caster, the composition of the two furnaces being shown in table 1 below. The specifications of the production continuous casting slab are as follows: 220mm thick, 1260mm wide and 10000mm long. Table 1:
2. the taper of the crystallizer is 1.25%.
3. A cold water amount: broad face 3400L/min and narrow face 415L/min.
4. Two-cooling specific water quantity: 0.48L/kg.
5. The protective slag comprises the following main components in percentage by weight: caO content 26%; siO (SiO) 2 The content is 33%; TC content 5.2%; f content 11.0%. Physicochemical indexes of the covering slag: basicity 0.80, melting point 1030 ℃; viscosity 0.10Pa.s.
6. Temperature of middle ladle: the tundish temperature was measured every 10 minutes for each steel casting pass, 5 times in total. The temperature of the 1 st furnace steel ladle is 1443 ℃, 1441 ℃, 1438 ℃ and 1436 ℃ in sequence. The pack temperature in furnace 2 was 1436 ℃, 1435 ℃, 1433 ℃, 1431 ℃ and 1429 ℃ in this order.
7. The process is carried out at a pulling speed: constant pull rate of 0.8 m/min.
8. When the dummy ingot is blocked, the nail scraps are spread for 8mm in thickness, and 13 springs are placed.
9. At the seedling emergence time of 76s, 10kg of slag is added when the molten steel floods the spring, and the casting powder is pushed in when the side hole of the water gap is submerged. When the liquid level of the molten steel is 130mm away from the upper edge of the copper plate, starting a withdrawal and straightening machine, and starting the withdrawal speed to be 0.2m/min.
10. And (3) speed increasing operation: the speed is increased to 0.3m/min for 30s at 0.2m/min, then the speed is increased to 0.1m/min every 1min, and the speed increasing slope is 0.5m/min.
11. The electromagnetic stirring adopts 400A current and 5Hz frequency, and 15s reversing process.
12. The dynamic soft pressing adopts a special pressing process, and the pressing amount of the pasty area is 2.3mm.
13. And (3) tail blank capping operation: when the molten steel in the tundish is remained at the height of 200mm, the pulling speed is reduced from 0.8m/min to 0.5m/min. Then the slag is fished out at the two sides of the water gap by using slag scooping-out, and the thickness of a slag layer is 8mm after slag scooping-out. When the height of molten steel in the tundish is 100mm, the pulling speed is directly reduced from 0.5m/min to 0.1m/min. And continuously water is sprayed to the wall of the crystallizer by using a water pipe to cool the tail blank until the tail blank is discharged out of the lower opening of the crystallizer. And (5) using a slag scooping scraper to scoop out the covering slag blocks on the upper part of the tail blank.
The pull rate of 14.0.1m/min was maintained for 2min, followed by a ramp of 0.3m/min. A pull rate of 0.3m/min was maintained for 2min and then a pull rate of 0.5m/min was increased. And (3) after the tail blank is discharged out of the crystallizer, accelerating by 0.8m/min, maintaining for 1min, accelerating by 1.2m/min, and outputting the tail blank.
15. The tail blank stays in the crystallizer for 3min and 30s, and the total time of the pulling speed is 4min and 50s, which is lower than 0.5m/min.
16. The high-carbon high-manganese wear-resistant steel of the production 2 furnaces is normally cast without bonding, the surface of a casting blank is free from longitudinal crack defects, tail blanks are normally capped, the problem of meat falling at the corners of the tail blanks is avoided, and the casting blank is produced without central layering defects after rolling.
Example 2
1. Two furnaces of high carbon and high manganese wear resistant steel were produced by continuous casting using a straight arc caster, the composition of the two furnaces being shown in table 2 below. The specifications of the production continuous casting slab are as follows: 220mm in thickness, 1060mm in width, 9000mm in length. Table 2:
2. the taper of the crystallizer is 1.28%.
3. A cold water amount: broad side 3450L/min, narrow side 420L/min.
4. Two-cooling specific water quantity: 0.48L/kg.
5. The protective slag comprises the following main components in percentage by weight: caO content 26%; siO (SiO) 2 The content is 33%; TC content 5.2%; f content 11.0%. Physicochemical indexes of the covering slag: basicity is 0.85, melting point is 1030 ℃; viscosity 0.12Pa.s.
6. Temperature of middle ladle: the tundish temperature was measured every 10 minutes for each steel casting pass, 5 times in total. The ladle temperature of the 1 st furnace steel is 1442 ℃, 1440 ℃, 1436 ℃, 1433 ℃ and 1429 ℃ in sequence. The pack temperature in furnace 2 was 1431 ℃, 1429 ℃, 1428 ℃, 1426 ℃ in this order.
7. The process is carried out at a pulling speed: constant pull rate of 0.82 m/min.
8. When the dummy ingot is blocked, the nail scraps are spread for 9mm in thickness, and 13 springs are placed.
9. And the seedling emergence time is 72s, 9kg of slag is added when the molten steel floods the spring, and the casting powder is pushed in when the side hole of the water gap is submerged. When the liquid level of molten steel is 120mm away from the upper edge of the copper plate, starting a withdrawal and straightening machine, and starting the withdrawal speed to be 0.25m/min.
10. And (3) speed increasing operation: the speed is increased to 0.4m/min for 30s at 0.25m/min, then increased to 0.1m/min every 1min, and the increasing slope is 0.5m/min.
11. The electromagnetic stirring adopts 420A current and 8Hz frequency, and 15s reversing process.
12. The dynamic soft pressing adopts a special pressing process, and the pressing amount of the pasty area is 2.3mm.
13. And (3) tail blank capping operation: when the molten steel in the tundish is remained at the height of 200mm, the pulling speed is reduced from 0.8m/min to 0.5m/min. Then the slag is fished out at the two sides of the water gap by using slag scooping-out, and the thickness of a slag layer is 8mm after slag scooping-out. When the height of molten steel in the tundish is 100mm, the pulling speed is directly reduced from 0.5m/min to 0.1m/min. And continuously water is sprayed to the wall of the crystallizer by using a water pipe to cool the tail blank until the tail blank is discharged out of the lower opening of the crystallizer. And (5) using a slag scooping scraper to scoop out the covering slag blocks on the upper part of the tail blank.
The pull rate of 14.0.1m/min was maintained for 2min, followed by a ramp of 0.3m/min. A pull rate of 0.3m/min was maintained for 2min and then a pull rate of 0.5m/min was increased. And (3) after the tail blank is discharged out of the crystallizer, accelerating by 0.8m/min, maintaining for 1min, accelerating by 1.2m/min, and outputting the tail blank.
15. The tail blank stays in the crystallizer for 3min20s, and the total time of the pulling speed is lower than 0.5m/min for 4min30s.
16. The high-carbon high-manganese wear-resistant steel of the production 2 furnaces is normally cast without bonding, the surface of a casting blank is free from longitudinal crack defects, tail blanks are normally capped, the problem of meat falling at the corners of the tail blanks is avoided, and the casting blank is produced without central layering defects after rolling.
Example 3
1. Two furnaces of high carbon and high manganese wear resistant steel were produced by continuous casting using a straight arc caster, the composition of the two furnaces being shown in table 3 below. The specifications of the production continuous casting slab are as follows: 220mm in thickness, 1060mm in width, 9000mm in length. Table 3:
2. the taper of the crystallizer is 1.25%.
3. A cold water amount: broad face 3380L/min and narrow face 415L/min.
4. Two-cooling specific water quantity: 0.43L/kg.
5. The protective slag comprises the following main components in percentage by weight: caO content 26%; siO (SiO) 2 The content is 33%; TC content 5.2%; f content 11.0%. Physicochemical indexes of the covering slag: basicity is 0.85, melting point is 1030 ℃; viscosity 0.12Pa.s.
6. Temperature of middle ladle: the tundish temperature was measured every 10 minutes for each steel casting pass, 5 times in total. The temperature of the 1 st furnace steel ladle is 1446 ℃, 1443 ℃, 1441 ℃, 1439 ℃ and 1436 ℃ in sequence. The temperature of the 2 nd furnace is 1436 ℃, 1434 ℃, 1430 ℃, 1429 ℃ and 1429 ℃ in sequence.
7. The process is carried out at a pulling speed: constant pull rate of 0.85 m/min.
8. When the dummy ingot is blocked, the nail scraps are spread for 10mm in thickness, and 12 springs are placed.
9. And the seedling emergence time is 78s, 10kg of casting powder is added when the molten steel floods the spring, and the casting powder is pushed when the side hole of the water gap is submerged. When the liquid level of the molten steel is 130mm away from the upper edge of the copper plate, starting a withdrawal and straightening machine, and starting the withdrawal speed to be 0.20m/min.
10. And (3) speed increasing operation: the speed is increased to 0.4m/min for 50s at 0.20m/min, then increased to 0.15m/min every 1.5min, and the increasing slope is 0.5m/min.
11. The electromagnetic stirring adopts 400A current and 8Hz frequency, and a 15s reversing process.
12. The dynamic soft pressing adopts a special pressing process, and the pressing amount of the pasty area is 2.2mm.
13. And (3) tail blank capping operation: when the height of molten steel in the tundish is 250mm, the pulling speed is reduced from 0.85m/min to 0.6m/min. Then the slag is fished out at the two sides of the water gap by using slag scooping-out, and the thickness of a slag layer is 8mm after slag scooping-out. When the height of molten steel in the tundish is 150mm, the pulling speed is directly reduced from 0.6m/min to 0.1m/min. And continuously water is sprayed to the wall of the crystallizer by using a water pipe to cool the tail blank until the tail blank is discharged out of the lower opening of the crystallizer. And (5) using a slag scooping scraper to scoop out the covering slag blocks on the upper part of the tail blank.
The pull rate of 14.0.1m/min was maintained for 2min, followed by a ramp of 0.3m/min. A pull rate of 0.3m/min was maintained for 2min and then a pull rate of 0.5m/min was increased. And (3) after the tail blank is discharged out of the crystallizer, accelerating by 0.8m/min, maintaining for 1min, accelerating by 1.2m/min, and outputting the tail blank.
15. The tail blank stays in the crystallizer for 3min50s, and the total time of the pulling speed is lower than 0.5m/min for 4min10s.
16. The high-carbon high-manganese wear-resistant steel of the production 2 furnaces is normally cast without bonding, the surface of a casting blank is free from longitudinal crack defects, tail blanks are normally capped, the problem of meat falling at the corners of the tail blanks is avoided, and the casting blank is produced without central layering defects after rolling.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. A method for producing high-carbon high-manganese wear-resistant steel continuous casting billets by a straight arc slab caster is characterized by comprising the following steps of: the method comprises the following steps:
(1) Solves the problem of casting blank through length longitudinal cracking, and comprises the following specific steps:
1) The taper of the crystallizer is 1.20 to 1.30 percent,
2) The pulling speed is 0.7-1.0 m/min,
3) The temperature of the tundish is 1425-1445 ℃,
4) A cold water volume wide surface 3300-3500L/min and a narrow surface 380-430L/min,
5) The specific water quantity of the secondary cooling water is 0.4-0.5L/min,
6) The main components of the covering slag are as follows by weight percent: caO content 26+ -3%, siO 2 33+ -3% of the content, 5.2+ -1.0% of TC, 11.0+ -2.5% of F, and physicochemical indexes of the covering slag: basicity 0.80+ -0.06, melting point 1030+ -30deg.C, viscosity 0.10+ -0.03Pa.s;
(2) Solves the problem of casting bonding steel leakage, and comprises the following specific steps:
1) The cold material is put in when the dummy ingot is blocked: the spreading thickness of the nail scraps is 8-10 mm, 12-15 springs are placed,
2) The seedling emergence time is 70-80 s, 8-10 kg of casting powder is added when the molten steel floods the spring, the casting powder is pushed into the side hole of the submerged nozzle,
3) When the liquid level of molten steel is 120-140 mm away from the upper edge of the copper plate, starting a withdrawal and straightening machine, the starting withdrawal speed is 0.2-0.25 m/min,
4) And (3) speed increasing operation: the speed is increased to 0.3-0.4 m/min for 30-50 s at 0.2-0.25 m/min, then the speed is increased by 0.1-0.2 m/min every 1-1.5 min, the speed increasing slope is 0.5+/-0.05 m/min,
5) The ladle temperature in the casting heat is 1435-1445 ℃,
6) After starting, using a slag picking rod to measure the travelling condition of the blank shell, confirming whether the blank shell is adhered, and immediately stopping the machine for 10-20 s for restarting if the blank shell is adhered;
(3) Solves the problems of extrusion of molten steel from the capping of the tail billet and brittle fracture of the billet shell, and comprises the following specific steps:
1) When the molten steel in the tundish is remained at the height of 200-300 mm, the pulling speed is reduced from 0.8-1.0 m/min to 0.5-0.6 m/min,
2) The slag is fished at the two sides of the water gap by using slag scooping rakes, the thickness of a slag layer after slag scooping is less than 10mm,
3) When the molten steel in the tundish is 100-150 mm high, the pulling speed is directly reduced from 0.5-0.6 m/min to 0.1+/-0.02 m/min,
4) Continuously water is sprayed to the wall of the crystallizer by using a water pipe to cool the tail blank until the tail blank is discharged out of the lower opening of the crystallizer,
5) The slag blocks on the upper part of the tail blank are fished out by using slag scooping rakes,
6) The pulling speed is maintained at 0.1-0.2 m/min for 2-3 min, then the pulling speed is increased by 0.3-0.4 m/min,
7) The pulling speed is maintained at 0.3-0.4 m/min for 2-3 min, then the pulling speed is increased by 0.5-0.6 m/min,
8) The speed of the tail blank is increased by 0.8-0.9 m/min after the tail blank is discharged out of the crystallizer, the speed is increased by 1.2-1.3 m/min after the tail blank is maintained for 1-1.5 min, the tail blank is rapidly output,
9) The method requires that the retention time of the tail billet in a crystallizer is less than 4min, the total time of the pulling speed is less than 0.5m/min is less than 7min, the billet tail is rapidly cooled by water at a low pulling speed, the solidification of the billet tail is accelerated, the temperature of a casting blank in a casting machine is ensured, and longitudinal cracking or brittle fracture of the billet tail is avoided;
(4) The method solves the problems of center segregation and center layering after rolling, and comprises the following specific steps:
1) The electromagnetic stirring adopts 400+/-50A current and 5-8 Hz frequency, 15-25 s reversing process,
2) The dynamic soft pressing adopts a special pressing process, and the pressing amount of the paste area is increased from 1.7-1.9 mm to 2.3-2.5 mm.
2. The method for producing the high-carbon high-manganese wear-resistant steel continuous casting blank by using the straight arc slab caster as claimed in claim 1, wherein the method comprises the following steps of: the high-carbon high-manganese wear-resistant steel comprises the following chemical components in percentage by weight: 0.9 to 1.2 percent of C, 11.0 to 14.0 percent of Mn, 0.3 to 0.8 percent of Si, less than 0.035 percent of P, less than 0.030 percent of S, 0.60 to 1.50 percent of Cr, and the balance of Fe and unavoidable impurity elements.
3. The method for producing the high-carbon high-manganese wear-resistant steel continuous casting blank by using the straight arc slab caster as claimed in claim 1, wherein the method comprises the following steps of: the high-carbon high-manganese wear-resistant steel continuous casting billet has the specification that: 200-250 mm thick, 1000-1500 mm wide and 3000-12000 mm long.
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