CN101658912A - Method for capping nickel and stainless steel continuous casting tail billet - Google Patents
Method for capping nickel and stainless steel continuous casting tail billet Download PDFInfo
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Abstract
A method for capping a nickel and stainless steel continuous casting tail billet comprises the following steps: I. In a continuous casting process, when steel water in a tundish has 7.9 tons to 8.1 tons left, the casting speed is gradually reduced; II. In the process of when the steel water is reduced to 4.9 tons to 5.1 tons from 6.9 tons to 7.1 tons, the casting speed is kept unchanged; III. Whenthe steel water is reduced from 4.9 tons to 5.1 tons, residue dragging begins; IV. When the steel water is reduced from 3.9 tons to 4.1 tons, the casting speed is kept at 0.4 plus or minus 0.05m/min;V. When the steel water is reduced from 2.9 tons to 3.1 tons, residue dragging begins and water cooling is carried out, and the casting speed is reduced to 0.1 plus or minus 0.05m/min slowly; VI. When the steel water is reduced to 1.4 tons to 1.6 tons, the casting speed is kept at 0.1 plus or minus 0.05m/min; VII. Good capping is ensured, and the continuous casting speed is increased; and VIII. When a tail end of the continuous casting billet goes out of a mould, good capping is ensured again, and the speed is increased to pull the continuous casting billet out of a continuous caster. The method for capping the nickel and stainless steel continuous casting tail billet has safe operation and short capping time.
Description
Technical field
The present invention relates to a kind of method for capping of nickel and stainless steel continuous casting tail billet.
Background technology
The stainless steel continuous casting machine has adopted hydraulic intelligent fan-shaped section (ASTC) and has gently depressed technology, and the width of plate slab of being produced is bigger in addition, brings difficulty to watering to bind eventually.The method for capping of existing nickel and stainless steel continuous casting tail billet is with traditional slow reduction of speed method for capping, the time of binding is longer, be easy to cause tail base surge accident in the process of binding, promptly go out under the effect that the high pulling rate in crystallizer speed-raising back and casting machine gently depress at strand, molten steel is emerged from the strand afterbody, is having a strong impact on ordinary production and device security.Therefore it is necessary original nickel and stainless steel continuous casting base mode of binding being improved.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method for capping that has nickel and stainless steel continuous casting tail billet now, the method for capping of the nickel and stainless steel continuous casting tail billet of the invention provides a kind of handling safety, lacking the time of binding.
With traditional slow reduction of speed method for capping, because deceleration time is long, the molten steel of cast is mainly used in feeding before watering eventually, increased the molten steel amount at strand middle part relatively, reduced afterbody base shell length, make in the strand not solidified molten steel extrude from the base tail gently depressing under the effect, especially be easy to cause the tail base that the surge accident takes place in the process of binding for big section casting blank.Can cause the shrinkage cavity of tail base long again but the reduction of speed process is too short, influence the strand lumber recovery.For solving the deficiency that existing nickel and stainless steel continuous casting tail billet binds, the present invention by following some improve the effect that the nickel and stainless steel strand binds.
The method for capping of this nickel and stainless steel continuous casting tail billet comprises following sequential steps:
I this method is to carry out possessing on the straight circular-arc type continuous casting machine of light press function, in the casting process, also surplus 7.9 tons～8.1 ton hours of molten steel in the tundish, the molten steel amount among contrast Fig. 2 and the relation curve of continuous casting billet pulling rate draw continuous casting billet, the pulling rate of continuous casting billet is since the slow reduction of speed of 1.2 ± 0.05m/min, and the molten steel in tundish also remains 7.6 tons～7.4 ton hours, and pulling rate drops to 1 ± 0.05m/min, also surplus 6.9 tons～7.1 ton hours of molten steel in tundish, pulling rate drops to 0.8 ± 0.05m/min.
The molten steel of II in the tundish is from 6.9 tons～7.1 tons processes that drop to 4.9 tons～5.1 electricity, and the pulling rate of continuous casting billet remains on 0.8 ± 0.05m/min;
III begins to drag for slag in the process of molten steel by 4.9 tons～5.1 tons of declines in the tundish, rake removes base tail top scum silica frost, accelerates the speed that binds, and improves the quality that binds; Also surplus 4.4 tons～4.6 ton hours of molten steel in tundish, the pulling rate of continuous casting billet drops to 0.6 ± 0.05m/min, and the molten steel in tundish is 3.9 tons～4.1 ton hours also, and pulling rate drops to 0.4 ± 0.05m/min;
Molten steel in the IV tundish drops in 2.9 tons～3.1 tons the process by 3.9 tons～4.1 tons, and the pulling rate of continuous casting billet remains on 0.4 ± 0.05m/min;
When the molten steel in the V tundish descends by 2.9 tons～3.1 tons, drag for slag, and the casting machine operator scheme transferred to the wriggling mode, and carry out the water flowing cooling, also surplus 2.4 tons～2.6 ton hours of molten steel in tundish, pulling rate drops to 0.3 ± 0.05m/mi, and subsequently, the computer control pulling rate drops to 0.1 ± 0.05m/min at a slow speed;
Molten steel amount in the VI tundish continues to descend, and the molten steel amount drops to 1.4 tons～1.6 ton hours, and the pulling rate of continuous casting billet remains on 0.1 ± 0.05m/mi;
VII checks the situation of binding repeatedly, and when the tail end for the treatment of continuous casting billet was pulled out crystallizer, it was good to confirm to bind.Improve the pulling rate of continuous casting billet, pulling rate can be brought up to 1.25 ± 0.05m/mi;
After the tail end of VIII continuous casting billet goes out crystallizer, reaffirm and bind well that speed-raising is not less than 1.4 ± 0.05m/mi, and continuous casting billet is pulled out conticaster.
The method for capping of this nickel and stainless steel continuous casting tail billet during water flowing, should be taked a small amount of mode repeatedly in step V, to guarantee rubescent being as the criterion of afterbody of continuous casting billet.
The method for capping of this nickel and stainless steel continuous casting tail billet begins to drag for slag at Step II I, finishes up to continuous casting, from the close-by examples to those far off pushes away 3-5 time with dragging for the slag rake, draws near and drags for the slag operation, is convenient to observe at any time the situation of binding.Forbid to disclose or stir liquid level with the oxygen pipe.
The method for capping of this above-mentioned nickel and stainless steel continuous casting tail billet, its steps characteristic is:
In the I casting process, also surplus 8.0 ton hours of molten steel in the tundish, the pulling rate of continuous casting billet begins slow reduction of speed from 1.2m/min, also surplus 7.5 ton hours of molten steel in tundish, pulling rate drops to 1.0m/min, also surplus 7.0 ton hours of the molten steel in tundish, and pulling rate drops to 0.8m/min;
The molten steel of II in the tundish drops to 5.0 tons the process from 7.0 tons, and the pulling rate of continuous casting billet remains on 0.80m/min;
III begin to drag for slag, and the control of molten steel liquid level forwards manual control to by automatic control in the process of molten steel by 5.0 tons of declines in the tundish; Also surplus 4.5 ton hours of molten steel in tundish, the pulling rate of continuous casting billet drops to 0.60m/min, also surplus 4.0 ton hours of the molten steel in tundish, pulling rate drops to 0.40m/min;
Molten steel in the IV tundish continues to drop in 3.0 tons the process, and the pulling rate of continuous casting billet remains on 0.40m/min;
When the molten steel in the V tundish descends by 3.0 tons, drag for slag, and the casting machine operator scheme is transferred to the wriggling mode, and carry out the water flowing cooling; Also surplus 2.5 ton hours of molten steel in tundish, pulling rate drops to 0.30m/min, and the computer control pulling rate drops to 0.11m/min;
Molten steel amount in the VI tundish continues to descend, and the molten steel amount is removed to 1.5 ton hours, and the pulling rate of continuous casting billet keeps 0.1m/min;
VII improves the pulling rate of continuous casting billet, brings up to 1.3m/min.
After the tail end of VIII continuous casting billet went out crystallizer, it was good to confirm to bind, and speed-raising is not less than 1.4m/min, and continuous casting billet is pulled out conticaster.
The method for capping of this nickel and stainless steel continuous casting tail billet, the pulling rate of continuous casting billet descends very fast, has increased the length of the outside base shell of continuous casting billet relatively, can effectively stop continuous casting billet tail end surge; The molten steel that while continuous casting billet core is extruded has remedied the contraction that the invar water-setting causes admittedly, reduces continuous casting billet tail end shrinkage hole length, the too fast influence to the continuous casting billet lumber recovery of having avoided the continuous casting billet pulling rate to fall; Owing to shortened the low pulling rate time, improved the quality of continuous casting billet tail end in addition.
Description of drawings
Fig. 1 is the continuous casting process schematic flow sheet.
Fig. 2 is the molten steel amount in the tundish and the graph of relation of continuous casting billet pulling rate in the casting process.Among the above-mentioned figure:
1-tundish 2-molten steel 3-crystallizer 4-continuous casting billet suitable for reading tail top
5-crystallizer 6-continuous casting billet 7-backing roll
The specific embodiment
Describe the specific embodiment of the method for capping of this nickel and stainless steel continuous casting tail billet in detail below in conjunction with embodiment and accompanying drawing thereof, but the specific embodiment of the method for capping of this nickel and stainless steel continuous casting tail billet is not limited to following embodiment.
Embodiment
Present embodiment is to implement possessing on the straight arc conticaster of light press function.Referring to Fig. 1.Tundish 1 nominal capacity is 24 tons, the gauge thickness 200mm of continuous casting billet 6, width 1535mm, crystallizer 5 length 900mm.Target pulling rate 1.15m/min.
The embodiment of the method for capping of this nickel and stainless steel continuous casting tail billet is a following sequential steps:
Molten steel also has 8 ton hours in the I tundish 1, relation curve according to molten steel amount among Fig. 2 and continuous casting billet pulling rate, the pulling rate of continuous casting billet 6 begins slow reduction of speed from 1.15m/min, also surplus 7.5 ton hours of molten steel in tundish 1, pulling rate drops to 1.0m/min, also surplus 7 ton hours of molten steel in tundish 1, pulling rate drops to 0.8m/min;
II drops in 5 tons the process when the molten steel in the tundish 1 is 7 tons, and the pulling rate of continuous casting billet 6 keeps 0.8m/min;
III begins to drag for slag in the process of molten steel by 5 tons of declines in the tundish 1, rake removes base tail top scum silica frost, accelerates the speed that binds, and improve the quality that binds, and the control of molten steel liquid level forwards manual control to by automatic control; Also surplus 4.5 ton hours of molten steel in tundish 1, the pulling rate of continuous casting billet 6 drops to 0.6m/min, also surplus 4 ton hours of the molten steel in tundish 1, pulling rate drops to 0.4m/min;
Molten steel in the IV tundish 1 drops in 3 tons the process by 4 tons, and the pulling rate of continuous casting billet 6 keeps 0.4m/min;
When the molten steel in the V tundish 1 descends by 3 tons, drag for slag, and the casting machine operator scheme is transferred to the wriggling mode, and carry out the water flowing cooling; Also surplus 2.5 ton hours of molten steel in tundish 1, pulling rate drops to 0.3m/min, also surplus 2.2 ton hours of the molten steel in tundish 1, pulling rate drops to 0.2m/min, also surplus 2.0 ton hours of the molten steel in tundish 1, pulling rate drops to 0.1m/min;
Molten steel in the VI tundish 1 drops to 1.5 ton hours by 2 tons, and the pulling rate of continuous casting billet 6 keeps 0.1m/min;
VII checks the situation of binding repeatedly, when the tail end for the treatment of continuous casting billet is pulled out crystallizer, confirm no problem after, improve the position speed of continuous casting billet, also surplus 1.0 ton hours of the molten steel in tundish 1, pulling rate is brought up to 0.5m/min, also surplus 0.5 ton hour of molten steel in tundish 1, pulling rate is brought up to 0.9m/min, and when the molten steel in the tundish 1 had fallen, the pulling rate of continuous casting billet 6 was brought up to 1.3m/min.
After the tail end of VIII continuous casting billet went out crystallizer, it was good to confirm to bind, and the 1.4m/min that raises speed pulls out conticaster with continuous casting billet 6.
Present embodiment water flowing when cooling in step V, should take a small amount of mode repeatedly, to guarantee rubescent being as the criterion of afterbody of continuous casting billet.Present embodiment begins to drag for slag at Step II I, finishes up to continuous casting,
Claims (5)
1, a kind of method for capping of nickel and stainless steel continuous casting tail billet, it comprises following sequential steps:
I this method is to carry out possessing on the straight circular-arc type continuous casting machine of light press function, in the casting process, also surplus 7.9 tons～8.1 ton hours of molten steel in the tundish, the pulling rate of continuous casting billet is since the slow reduction of speed of 1.2 ± 0.05m/min, also surplus 7.6 tons～7.4 ton hours of molten steel in tundish, pulling rate drops to 1 ± 0.05m/min, also surplus 6.9 tons～7.1 ton hours of the molten steel in tundish, and pulling rate drops to 0.8 ± 0.05m/min;
The molten steel of II in the tundish drops to 4.9 tons～5.1 tons the process from 6.9 tons～7.1 tons, and the pulling rate of continuous casting billet remains on 0.8 ± 0.05m/min;
III begins to drag for slag in the process of molten steel by 4.9 tons～5.1 tons of declines in the tundish, rake removes base tail top scum silica frost, accelerates the speed that binds, and improves the quality that binds; Also surplus 4.4 tons～4.6 ton hours of molten steel in tundish, the pulling rate of continuous casting billet drops to 0.6 ± 0.05m/min, and the molten steel in tundish is 3.9 tons～4.1 ton hours also, and pulling rate drops to 0.4 ± 0.05m/min;
Molten steel in the IV tundish drops in 2.9 tons～3.1 tons the process by 3.9 tons～4.1 tons, and the pulling rate of continuous casting billet remains on 0.4 ± 0.05m/min;
When the molten steel in the V tundish descends by 2.9 tons～3.1 tons, drag for slag, and the casting machine operator scheme transferred to the wriggling mode, and carry out the water flowing cooling, also surplus 2.4 tons～2.6 ton hours of molten steel in tundish, pulling rate drops to 0.3 ± 0.05m/mi, and subsequently, the computer control pulling rate drops to 0.1 ± 0.05m/min at a slow speed;
Molten steel amount in the VI tundish continues to descend, and the molten steel amount drops to 1.4 tons～1.6 ton hours, and the pulling rate of continuous casting billet remains on 0.1 ± 0.05m/mi;
VII checks the situation of binding repeatedly, and when the tail end for the treatment of continuous casting billet was pulled out crystallizer, it was good to confirm to bind, and improved the pulling rate of continuous casting billet, and pulling rate is brought up to 1.25 ± 0.05m/mi;
After the tail end of VIII continuous casting billet goes out crystallizer, reaffirm and bind well that speed-raising is not less than 1.4 ± 0.05m/mi, and continuous casting billet is pulled out conticaster.
2, the method for capping of nickel and stainless steel continuous casting tail billet according to claim 1 is characterized in that: during water flowing, should take a small amount of mode repeatedly in step V, to guarantee rubescent being as the criterion of afterbody of continuous casting billet.
3, the method for capping of nickel and stainless steel continuous casting tail billet according to claim 1 and 2, it is characterized in that: begin to drag for slag at Step II I, finish up to continuous casting, from the close-by examples to those far off push away 3-5 time with dragging for the slag rake, draw near again and drag for the slag operation, be convenient to observe at any time the situation of binding, forbid to disclose or stir liquid level with the oxygen pipe.
4, the method for capping of nickel and stainless steel continuous casting tail billet according to claim 1 and 2 is characterized in that:
In the I casting process, also surplus 8.0 ton hours of molten steel in the tundish, the pulling rate of continuous casting billet begins slow reduction of speed from 1.2m/min, also surplus 7.5 ton hours of molten steel in tundish, pulling rate drops to 1.0m/min, also surplus 7.0 ton hours of the molten steel in tundish, and pulling rate drops to 0.8m/min;
The molten steel of II in the tundish drops to 5.0 tons the process from 7.0 tons, and the pulling rate of continuous casting billet remains on 0.80m/min;
III begin to drag for slag, and the control of molten steel liquid level forwards manual control to by automatic control in the process of molten steel by 5.0 tons of declines in the tundish; Also surplus 4.5 ton hours of molten steel in tundish, the pulling rate of continuous casting billet drops to 0.60m/min, also surplus 4.0 ton hours of the molten steel in tundish, pulling rate drops to 0.40m/min;
Molten steel in the IV tundish continues to drop in 3.0 tons the process, and the pulling rate of continuous casting billet remains on 0.40m/min;
When the molten steel in the V tundish descends by 3.0 tons, drag for slag, and the casting machine operator scheme is transferred to the wriggling mode, and carry out the water flowing cooling; Also surplus 2.5 ton hours of molten steel in tundish, pulling rate drops to 0.30m/min, and the computer control pulling rate drops to 0.11m/min;
Molten steel amount in the VI tundish continues to descend, and the molten steel amount is removed to 1.5 ton hours, and the pulling rate of continuous casting billet keeps 0.1m/min;
VII improves the pulling rate of continuous casting billet, brings up to 1.3m/min.
After the tail end of VIII continuous casting billet went out crystallizer, it was good to confirm to bind, and speed-raising is not less than 1.4m/min.
5, the method for capping of nickel and stainless steel continuous casting tail billet according to claim 3 is characterized in that:
In the I casting process, also surplus 8.0 ton hours of molten steel in the tundish, the pulling rate of continuous casting billet begins slow reduction of speed from 1.2m/min, also surplus 7.5 ton hours of molten steel in tundish, pulling rate drops to 1.0m/min, also surplus 7.0 ton hours of the molten steel in tundish, and pulling rate drops to 0.8m/min;
The molten steel of II in the tundish drops to 5.0 tons the process from 7.0 tons, and the pulling rate of continuous casting billet remains on 0.80m/min;
III begin to drag for slag, and the control of molten steel liquid level forwards manual control to by automatic control in the process of molten steel by 5.0 tons of declines in the tundish; Also surplus 4.5 ton hours of molten steel in tundish, the pulling rate of continuous casting billet drops to 0.60m/min, also surplus 4.0 ton hours of the molten steel in tundish, pulling rate drops to 0.40m/min;
Molten steel in the IV tundish continues to drop in 3.0 tons the process, and the pulling rate of continuous casting billet remains on 0.40m/min;
When the molten steel in the V tundish descends by 3.0 tons, drag for slag, and the casting machine operator scheme is transferred to the wriggling mode, and carry out the water flowing cooling; Also surplus 2.5 ton hours of molten steel in tundish, pulling rate drops to 0.30m/min, and the computer control pulling rate drops to 0.11m/min;
Molten steel amount in the VI tundish continues to descend, and the molten steel amount is removed to 1.5 ton hours, and the pulling rate of continuous casting billet keeps 0.1m/min;
VII improves the pulling rate of continuous casting billet, brings up to 1.3m/min.
After the tail end of VIII continuous casting billet went out crystallizer, it was good to confirm to bind, and speed-raising is not less than 1.4m/min.
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| CN103878333A (en) * | 2014-03-25 | 2014-06-25 | 济钢集团有限公司 | Final-pouring capping method for reducing abrasion of copper plate of crystallizer of moderate-thickness slab caster |
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| CN106825474A (en) * | 2016-12-25 | 2017-06-13 | 秦皇岛首秦金属材料有限公司 | A kind of method of extra-thick plate blank tail base quality control |
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| CN109420747B (en) * | 2017-09-02 | 2021-04-30 | 广东韶钢松山股份有限公司 | High-yield automatic capping process for slab caster |
| CN107900302A (en) * | 2017-10-26 | 2018-04-13 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device for improving slab tail base quality |
| CN107900302B (en) * | 2017-10-26 | 2020-07-17 | 首钢京唐钢铁联合有限责任公司 | Method and device for improving quality of slab tail blank |
| CN115070001A (en) * | 2022-05-20 | 2022-09-20 | 江阴兴澄特种钢铁有限公司 | Device and method for quickly covering tail billet of oversized continuous casting round billet |
| CN115070001B (en) * | 2022-05-20 | 2024-01-26 | 江阴兴澄特种钢铁有限公司 | Tail blank rapid cover device and method for oversized continuous casting round blank |
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| CN101658912B (en) | 2011-06-29 |
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