CN105014028A - Cold burden laying method and casting starting technology of sizing nozzle open type continuous casting billets - Google Patents
Cold burden laying method and casting starting technology of sizing nozzle open type continuous casting billets Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000005266 casting Methods 0.000 title claims abstract description 22
- 238000009749 continuous casting Methods 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title abstract description 4
- 238000004513 sizing Methods 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 94
- 239000010959 steel Substances 0.000 claims abstract description 94
- 239000002893 slag Substances 0.000 claims abstract description 10
- 239000000498 cooling water Substances 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 57
- 229910052802 copper Inorganic materials 0.000 claims description 57
- 239000010949 copper Substances 0.000 claims description 57
- 239000007788 liquid Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000010425 asbestos Substances 0.000 claims description 5
- 229910052895 riebeckite Inorganic materials 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000004544 sputter deposition Methods 0.000 abstract description 3
- 239000011810 insulating material Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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Abstract
The invention discloses a cold burden laying method and a casting starting technology of sizing-nozzle open type continuous casting billets. Crystallizer oil is firstly smeared before casting; a dummy bar where a dummy ingot hook and a cover plate are hooked is conveyed into a crystallizer; a gap is filled with heat-insulating materials; and then a broken steel drop layer, a cocoon-shaped cold burden layer and bowl-shaped cold burdens are sequentially laid. A crystallizer vibration mechanism, secondary cooling water and a draught fan are started. A ladle slide gate is opened, and molten steel is injected into a tundish. When the molten steel surface is 300-400 mm high, casting of the tundish starts; and after flames come up on the crystallizer for 4-5 s, casting starts when the molten steel surface rises to the position 250-350 mm away from an upper opening of the crystallizer. The starting pulling speed is 0.5 m/min; the speed is increased by 0.5 m/min every other 1-2 s; the pulling speed is increased to 2.5-2.8 m/min; the molten steel surface reaches the position 140-160 mm away from the upper opening of the crystallizer; and after the pulling speed is normal, slag fetching operation is performed in time. The cold burden laying method and the casting starting technology avoid the sputtering danger, waste and loss in the molten steel casting process; and the technical problems that because cold burden laying is not reasonable, pulling leakage is caused, and a dummy ingot hook head, the cold burdens and billet heads are not combined properly are solved.
Description
Technical field
The invention belongs to the starting of conticaster metering nozzle and open pouring technique technical field, the cold burden being specifically related to metering nozzle open type continuous casting square billet lays method and pouring technique is opened in starting.
Background technology
Current continuous casting production pouring type mainly contains three kinds:
(1) tundish slide mechanism hydraulic pressure stream-control protection cast.The method exploitation is more late, and because its fixed investment is large, auxiliary equipment is many, is only applied on the production slab caster of variety steel or the large square bland continuous-casting machine of the excellent special steel of a small amount of production.
(2) stopper rod flow control+submersed nozzle+covering slag molding casting.The method controls stopper by stopper control mechanism to move up and down, and realizes opening & closing ladle and regulate molten steel flow.The shortcoming of this technique is that cost is higher, casting process easily occurs that chock plug falls block, stopper rod runs wind, close the incessantly resistance to material accident such as bag or flow control effect difference, and changing submersed nozzle cutout has reclosing, and process waste product is many, the stopper life-span is low, becomes the bottleneck in handbag life-span in the middle of improving.
(3) metering nozzle opens wide cast.The method regulates the condition of molten steel flow owing to lacking, usually open water starting time, must repeatedly pendulum groove be forwarded to directly over crystallizer, catch Metal in Tundish, it is made to flow to accident slag bucket, realize the control of molten steel flow, make to inject between the molten steel of crystallizer and cold burden and combine better, avoid bleed-out of starting to walk.To open when watering pendulum rotating groove repeatedly and forward the following problem existed directly over crystallizer to: 1, directly thrust the high-temperature molten steel that middle bag flows out, cause molten steel to sputter, larger to the harm of operative employee; 2, the molten steel putting groove drainage flows to accident slag bucket and causes waste; 3, open that to water stages operating program more, personnel are crowded, and high-temperature molten steel splash easily causes in a hurry, impact operation; 4, molten steel is directly flushed on cold burden, easily stirs cold burden, causes inhomogeneous cooling even, easily causes bleed-out.
Therefore, the cold burden that the present invention aims to provide a kind of metering nozzle open type continuous casting square billet of optimization lays method, and opens pouring technique with the starting that this distributing method adapts, to avoiding the sputtering danger in pouring molten steel process and wasting loss; Solve cold burden to lay between the unreasonable bleedout that causes and dummy ingot gib head and cold burden, base head and combine technical problem improperly.
Summary of the invention
The first object of the present invention is to provide the cold burden of metering nozzle open type continuous casting square billet to lay method; The second object of the present invention is to provide the starting of metering nozzle open type continuous casting square billet to open pouring technique.
The first object of the present invention is achieved in that the cold burden of described metering nozzle open type continuous casting square billet lays method and comprises assembling, joint filling and cloth material process, specifically comprises:
A, assembling: before casting, on crystallizer copper inside pipe wall, smear crystallizer oil, consumption is 200 ~ 300ml; The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados.
B, joint filling: jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe with heat-barrier material.
C, cloth: the broken steel grit layer first laying particle diameter 1 ~ 2mm in crystallizer copper pipe, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
The second object of the present invention be achieved in that the starting of described metering nozzle open type continuous casting square billet open pouring technique comprise cold burden lay, pour into a mould preparation and pouring molten steel operation, specifically comprise:
A, cold burden lay: before casting, on crystallizer copper inside pipe wall, smear crystallizer oil, consumption is 200 ~ 300ml; The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados; With heat-barrier material, jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe; First in crystallizer copper pipe, lay the broken steel grit layer of particle diameter 1 ~ 2mm, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
B, cast prepare: open mold oscillator mechanism, secondary cooling water and blower fan, open ladle slide gate in billet, molten steel starts to inject tundish.
C, pouring molten steel: when molten steel face in tundish is to 300 ~ 400mm height, take out during the plug blocking middle water containing opening carries out to unwrap and water, make molten steel inject crystallizer; Device to be crystallized has on flame after 4 ~ 5s, and molten steel in mold liquid level rises to from crystallizer 250 ~ 350mm suitable for reading, then start to cast, starting pulling rate 0.5m/min; According to liquid level situation, every 1 ~ 2 second speed-raising 0.5m/min, progressively pulling rate is risen to normal pulling rate 2.5 ~ 2.8m/min, liquid steel level progressively reached from crystallizer 140 ~ 160mm place suitable for reading, needed to keep the liquid steel level in crystallizer to stablize in process; After entering normal pulling rate, need immediately carry out dragging for slag operation.
Adopt cold burden of the present invention to lay method and pouring technique is opened in starting, avoid and to open when watering pendulum rotating groove repeatedly and forward the dangerous and waste problem of the molten steel sputtering existed directly over crystallizer to.By to the cloth of cold burden high-volume and the mode that lays carry out global optimization, avoid starting too fast too early, the bleedout that shell thickness causes not, also avoid starting steel flow large, directly wash away stirring cold burden, the even bleedout caused of inhomogeneous cooling.Avoiding cold burden lays too much, and molten steel is not fully filled into cold burden space, the problem that dummy ingot gib head and cold burden bond loosely.Avoid cold burden and lay deficiency, dummy ingot gib head bent part is melted by molten steel, gib head can not with the problem of the effective riveted of base head.In addition, cold burden of the present invention lays method and the strong adaptability of pouring technique to liquid steel temperature is opened in starting, shows molten steel temperature in tundish 1560 ~ 1580 DEG C, all can realize directly starting to walk to open to water.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of mould assembly;
In figure: 1-crystallizer copper pipe; 2-cold burden; 3-dummy device.
Fig. 2 is the layout schematic diagram of cold burden in Fig. 1;
In figure: 21-heat-barrier material; 22-broken steel grit; 23-cocoon-like cold burden; 24-bowl-shape cold burden.
Fig. 3 is the partial enlarged drawing of Fig. 2;
In figure: 21-heat-barrier material; 22-broken steel grit; 23-cocoon-like cold burden; 33-dummy ingot cover plate.
Fig. 4 is the schematic diagram of dummy device in Fig. 1;
In figure; 31-dummy ingot gib head; 32-dummy ingot hook tail; 33-dummy ingot cover plate.
Detailed description of the invention
The present invention is further illustrated below, but limited the present invention never in any form, and any conversion done based on training centre of the present invention or replacement, all belong to protection scope of the present invention.
The cold burden of metering nozzle open type continuous casting square billet of the present invention lays method and comprises assembling, joint filling and cloth material process, specifically comprises:
Described assembly process refers to: before casting, on crystallizer copper inside pipe wall, smear crystallizer oil, consumption is 200 ~ 300ml; The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados.
Described joint filling operation refers to: with heat-barrier material, jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe.
Described cloth material process refers to: the broken steel grit layer first laying particle diameter 1 ~ 2mm in crystallizer copper pipe, paves even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
The length of described crystallizer copper pipe is 900cm.
The diameter of section of described dummy ingot gib head is 30mm; Described dummy ingot hook tail is mounted on dummy bar; Described dummy ingot cover plate is the square steel plate of size 165mm × 165mm, thickness 2 ~ 3cm.
Described heat-barrier material is asbestos cord.
The starting of metering nozzle open type continuous casting square billet of the present invention is opened pouring technique and is comprised cold burden and lay, pour into a mould preparation and pouring molten steel operation, specifically comprises:
Described cold burden lays operation and refers to: before casting, on crystallizer copper inside pipe wall, smear crystallizer oil, consumption is 200 ~ 300ml; The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados; With heat-barrier material, jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe; First in crystallizer copper pipe, lay the broken steel grit layer of particle diameter 1 ~ 2mm, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
Described cast preparatory process refers to: open mold oscillator mechanism, secondary cooling water and blower fan, open ladle slide gate in billet, molten steel starts to inject tundish.
Described pouring molten steel operation refers to: when molten steel face in tundish is to 300 ~ 400mm height, take out during the plug blocking middle water containing opening carries out to unwrap and water, make molten steel inject crystallizer; Device to be crystallized has on flame after 4 ~ 5s, and molten steel in mold liquid level rises to from crystallizer 250 ~ 350mm suitable for reading, then start to cast, starting pulling rate 0.5m/min; According to liquid level situation, every 1 ~ 2 second speed-raising 0.5m/min, progressively pulling rate is risen to normal pulling rate 2.5 ~ 2.8m/min, liquid steel level progressively reached from crystallizer 140 ~ 160mm place suitable for reading, needed to keep the liquid steel level in crystallizer to stablize in process; After entering normal pulling rate, need immediately carry out dragging for slag operation.
After starting completes until casting, pulled out crystallizer from strand by dummy bar, the sequence of operations be separated with hot base to dummy bar is by computer controlled automatic.
The temperature of described Metal in Tundish is 1560 ~ 1580 DEG C.
When the temperature of described Metal in Tundish changes, need adjust pulling rate, in the temperature range allowed, lower pulling rate selected by the molten steel of higher temperature, otherwise higher pulling rate selected by the molten steel of lower temperature.
The amplitude of described crystallizer is 4mm, and vibration frequency is 300cpm.
The diameter of described metering nozzle is 2.0cm.
The cross dimensions of described square billet is 165mm × 165mm.
embodiment 1
1, cold burden lays: before casting, on the crystallizer copper inside pipe wall of long 900cm, smear 200ml crystallizer oil.The diameter of section of dummy ingot gib head is 30mm; Dummy ingot hook tail is mounted on dummy bar; Dummy ingot cover plate is the square steel plate of size 165mm × 165mm, thickness 2cm.The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados.With asbestos cord, jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe.First in crystallizer copper pipe, lay the broken steel grit layer of particle diameter 1 ~ 2mm, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
2, starting is opened and is watered: complete after cold burden lays on last stage, open mold oscillator mechanism, secondary cooling water and blower fan, open ladle slide gate in billet, molten steel starts to inject tundish, and the temperature of Metal in Tundish is 1580 DEG C.When molten steel face in tundish is to 300mm height, take out during the plug blocking middle water containing opening carries out to unwrap and water, make molten steel inject crystallizer; Device to be crystallized has on flame after 5s, and molten steel in mold liquid level rises to from crystallizer 350mm suitable for reading, then start to cast, starting pulling rate 0.5m/min; According to liquid level situation, every 1 ~ 2 second speed-raising 0.5m/min, progressively pulling rate is risen to normal pulling rate 2.5m/min, liquid steel level progressively reached from crystallizer 150mm place suitable for reading, needed to keep the liquid steel level in crystallizer to stablize in process; After entering normal pulling rate, need immediately carry out dragging for slag operation.After starting completes until casting, pulled out crystallizer from strand by dummy bar, the sequence of operations be separated with hot base to dummy bar is by computer controlled automatic.The cross dimensions of gained square billet is 165mm × 165mm.
embodiment 2
1, cold burden lays: before casting, on the crystallizer copper inside pipe wall of long 900cm, smear 300ml crystallizer oil.The diameter of section of dummy ingot gib head is 30mm; Dummy ingot hook tail is mounted on dummy bar; Dummy ingot cover plate is the square steel plate of size 165mm × 165mm, thickness 3cm.The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados.With asbestos cord, jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe.First in crystallizer copper pipe, lay the broken steel grit layer of particle diameter 1 ~ 2mm, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
2, starting is opened and is watered: complete after cold burden lays on last stage, open mold oscillator mechanism, secondary cooling water and blower fan, open ladle slide gate in billet, molten steel starts to inject tundish, and the temperature of Metal in Tundish is 1570 DEG C.When molten steel face in tundish is to 400mm height, take out during the plug blocking middle water containing opening carries out to unwrap and water, make molten steel inject crystallizer; Device to be crystallized has on flame after 4s, and molten steel in mold liquid level rises to from crystallizer 250mm suitable for reading, then start to cast, starting pulling rate 0.5m/min; According to liquid level situation, every 1 ~ 2 second speed-raising 0.5m/min, progressively pulling rate is risen to normal pulling rate 2.6m/min, liquid steel level progressively reached from crystallizer 140mm place suitable for reading, needed to keep the liquid steel level in crystallizer to stablize in process; After entering normal pulling rate, need immediately carry out dragging for slag operation.After starting completes until casting, pulled out crystallizer from strand by dummy bar, the sequence of operations be separated with hot base to dummy bar is by computer controlled automatic.The cross dimensions of gained square billet is 165mm × 165mm.
embodiment 3
1, cold burden lays: before casting, on the crystallizer copper inside pipe wall of long 900cm, smear 250ml crystallizer oil.The diameter of section of dummy ingot gib head is 30mm; Dummy ingot hook tail is mounted on dummy bar; Dummy ingot cover plate is the square steel plate of size 165mm × 165mm, thickness 2.5cm.The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados.With asbestos cord, jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe.First in crystallizer copper pipe, lay the broken steel grit layer of particle diameter 1 ~ 2mm, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
2, starting is opened and is watered: complete after cold burden lays on last stage, open mold oscillator mechanism, secondary cooling water and blower fan, open ladle slide gate in billet, molten steel starts to inject tundish, and the temperature of Metal in Tundish is 1560 DEG C.When molten steel face in tundish is to 350mm height, take out during the plug blocking middle water containing opening carries out to unwrap and water, make molten steel inject crystallizer; Device to be crystallized has on flame after 5s, and molten steel in mold liquid level rises to from crystallizer 300mm suitable for reading, then start to cast, starting pulling rate 0.5m/min; According to liquid level situation, every 1 ~ 2 second speed-raising 0.5m/min, progressively pulling rate is risen to normal pulling rate 2.8m/min, liquid steel level progressively reached from crystallizer 160mm place suitable for reading, needed to keep the liquid steel level in crystallizer to stablize in process; After entering normal pulling rate, need immediately carry out dragging for slag operation.After starting completes until casting, pulled out crystallizer from strand by dummy bar, the sequence of operations be separated with hot base to dummy bar is by computer controlled automatic.The cross dimensions of gained square billet is 165mm × 165mm.
Claims (9)
1. the cold burden of metering nozzle open type continuous casting square billet lays method, it is characterized in that comprising assembling, joint filling and cloth material process, specifically comprises:
A, assembling: before casting, on crystallizer copper inside pipe wall, smear crystallizer oil, consumption is 200 ~ 300ml; The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados;
B, joint filling: jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe with heat-barrier material;
C, cloth: the broken steel grit layer first laying particle diameter 1 ~ 2mm in crystallizer copper pipe, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays.
2. cold burden according to claim 1 lays method, it is characterized in that the length of described crystallizer copper pipe is 900cm.
3. cold burden according to claim 1 lays method, it is characterized in that described heat-barrier material is asbestos cord.
4. pouring technique is opened in the starting of metering nozzle open type continuous casting square billet, it is characterized in that comprising cold burden lays, pours into a mould preparation and pouring molten steel operation, specifically comprises:
A, cold burden lay: before casting, on crystallizer copper inside pipe wall, smear crystallizer oil, consumption is 200 ~ 300ml; The dummy bar hanging up properly dummy ingot hook and cover plate is sent into crystallizer, and cover plate is positioned at along 150mm place at the bottom of crystallizer, and dummy ingot gib head is towards intrados; With heat-barrier material, jam-pack is filled up in the gap between dummy ingot cover plate and crystallizer copper pipe; First in crystallizer copper pipe, lay the broken steel grit layer of particle diameter 1 ~ 2mm, pave even, thickness 1 ~ 2cm; Then on broken steel grit layer, lay diameter 2 ~ 3cm, the cocoon-like cold burden layer of length 5 ~ 6cm, evenly tiling is two-layer, gross thickness 4 ~ 6cm; Finally place diameter 12 ~ 14cm, the bowl-shape cold burden of thickness 1 ~ 2cm 4, respectively at crystallizer copper pipe extrados, left and right side respectively places one, and the rim of a bowl pastes crystallizer copper pipe, then places one at crystallizer copper pipe top, and the rim of a bowl is downward, completes cold burden and lays;
B, cast prepare: open mold oscillator mechanism, secondary cooling water and blower fan, open ladle slide gate in billet, molten steel starts to inject tundish;
C, pouring molten steel: when molten steel face in tundish is to 300 ~ 400mm height, take out during the plug blocking middle water containing opening carries out to unwrap and water, make molten steel inject crystallizer; Device to be crystallized has on flame after 4 ~ 5s, and molten steel in mold liquid level rises to from crystallizer 250 ~ 350mm suitable for reading, then start to cast, starting pulling rate 0.5m/min; According to liquid level situation, every 1 ~ 2 second speed-raising 0.5m/min, progressively pulling rate is risen to normal pulling rate 2.5 ~ 2.8m/min, liquid steel level progressively reached from crystallizer 140 ~ 160mm place suitable for reading, needed to keep the liquid steel level in crystallizer to stablize in process; After entering normal pulling rate, need immediately carry out dragging for slag operation.
5. pouring technique is opened in starting according to claim 4, it is characterized in that the temperature of described Metal in Tundish is 1560 ~ 1580 DEG C.
6. pouring technique is opened in starting according to claim 4, when it is characterized in that the temperature of described Metal in Tundish changes, need adjust pulling rate, in the temperature range allowed, lower pulling rate selected by the molten steel of higher temperature, otherwise higher pulling rate selected by the molten steel of lower temperature.
7. pouring technique is opened in starting according to claim 4, and it is characterized in that the amplitude of described crystallizer is 4mm, vibration frequency is 300cpm.
8. pouring technique is opened in starting according to claim 4, it is characterized in that the diameter of described metering nozzle is 2.0cm.
9. pouring technique is opened in starting according to claim 4, it is characterized in that the cross dimensions of described square billet is 165mm × 165mm.
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| CN108326251A (en) * | 2017-12-04 | 2018-07-27 | 新疆八钢铁股份有限公司 | Steel-making enterprise billet caster tundish uses the method that metering nozzle is cast |
| CN108339954A (en) * | 2018-02-11 | 2018-07-31 | 福建三钢闽光股份有限公司 | It is a kind of improving continuous casting and open the cold burden of gravy with meat or vegetables poured over rice or noodles base condensation rate and intensity lay method |
| CN108620547A (en) * | 2018-04-19 | 2018-10-09 | 芜湖新兴铸管有限责任公司 | Continuous casting opens the method poured |
| CN112916813A (en) * | 2019-12-05 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Method for accurately selecting scrap iron material for continuous casting safety seal dummy ingot |
| CN113305278A (en) * | 2021-05-07 | 2021-08-27 | 中国重型机械研究院股份公司 | Control device and method for no-slip pulling of dummy bar during starting |
| CN114799100A (en) * | 2022-05-05 | 2022-07-29 | 芜湖新兴铸管有限责任公司 | Continuous casting large round billet casting method |
| CN115283630A (en) * | 2022-08-22 | 2022-11-04 | 北京首钢股份有限公司 | Continuous casting method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106735005A (en) * | 2016-12-27 | 2017-05-31 | 西南铝业（集团）有限责任公司 | Aluminum alloy casting technique |
| CN106735005B (en) * | 2016-12-27 | 2018-11-20 | 西南铝业（集团）有限责任公司 | Aluminum alloy casting technique |
| CN108326251A (en) * | 2017-12-04 | 2018-07-27 | 新疆八钢铁股份有限公司 | Steel-making enterprise billet caster tundish uses the method that metering nozzle is cast |
| CN108339954A (en) * | 2018-02-11 | 2018-07-31 | 福建三钢闽光股份有限公司 | It is a kind of improving continuous casting and open the cold burden of gravy with meat or vegetables poured over rice or noodles base condensation rate and intensity lay method |
| CN108620547A (en) * | 2018-04-19 | 2018-10-09 | 芜湖新兴铸管有限责任公司 | Continuous casting opens the method poured |
| CN112916813A (en) * | 2019-12-05 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Method for accurately selecting scrap iron material for continuous casting safety seal dummy ingot |
| CN113305278A (en) * | 2021-05-07 | 2021-08-27 | 中国重型机械研究院股份公司 | Control device and method for no-slip pulling of dummy bar during starting |
| CN113305278B (en) * | 2021-05-07 | 2022-07-22 | 中国重型机械研究院股份公司 | Control device and method for no-slip pulling of dummy bar during starting |
| CN114799100A (en) * | 2022-05-05 | 2022-07-29 | 芜湖新兴铸管有限责任公司 | Continuous casting large round billet casting method |
| CN115283630A (en) * | 2022-08-22 | 2022-11-04 | 北京首钢股份有限公司 | Continuous casting method |
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