CN105436451B - Heavy rail steel tail blank casting method adopting tundish without slag stopping device - Google Patents
Heavy rail steel tail blank casting method adopting tundish without slag stopping device Download PDFInfo
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- CN105436451B CN105436451B CN201410497942.5A CN201410497942A CN105436451B CN 105436451 B CN105436451 B CN 105436451B CN 201410497942 A CN201410497942 A CN 201410497942A CN 105436451 B CN105436451 B CN 105436451B
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- casting
- tundish
- tail
- pulling rate
- crystallizer
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- 238000005266 casting Methods 0.000 title claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 239000002893 slag Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 19
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 10
- 239000000292 calcium oxide Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 230000003628 erosive effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 238000012797 qualification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 238000002271 resection Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 206010061245 Internal injury Diseases 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a method for casting a heavy rail steel tail blank by adopting a tundish without a slag stopping device, which comprises the following steps: 1) when the last molten steel pot is cast on a rectangular billet casting machine, adding quicklime into a tundish in sequence, and arranging a pouring gate retaining wall at a pouring gate of the tundish; 2) before each flow of the casting machine stops casting to the crystallizer, the casting speed is more than or equal to 0.5m/min, the liquid level of the tundish is more than 300mm, the casting speed is directly reduced to be less than or equal to 0.2m/min when the casting is stopped, the casting speed is kept until the tail of the blank is discharged from the lower opening of the crystallizer, then the casting speed is directly increased to be 0.5-0.8 m/min, and the casting speed is kept until the tail of the blank is discharged from a secondary cooling zone. Compared with the prior art, the invention has the beneficial effects that: 1) the flaw detection yield of the tail billet is improved from 85.3 percent to 96.8 percent; 2) the increase of inclusions caused by erosion of a slag stopping device and the like is reduced, and molten steel is easy to form effective flow; 3) the method of vertical lifting and vertical lowering of the pulling speed is adopted, and the problem of the thickness of the casting powder in the crystallizer is not required to be considered; 4) the cutting amount of the tail blank is reduced from 3.5 meters to 2 meters, and the yield is improved.
Description
Technical field
The present invention relates to a kind of continuous-cast blank casting method, more particularly to a kind of heavy rail of the use without skimming device tundish
Steel tail base casting method.
Background technology
Properties of Heavy Rail Steel is to produce the steel grade that nominal weight is more than or equal to 30kg/m rail, and China is primarily referred to as producing 60kg/m
The steel grade that~75kg/m heavy rail is used.Pressure, the work of shock loading and frictional force when heavy rail will bear rolling stock operation
With it requires enough intensity, hardness and certain toughness.To ensure the quality of Properties of Heavy Rail Steel, have sternly to the cleanliness factor of steel
Field trash in the requirement of lattice, steel is the main cause for causing to produce fatigue rupture in heavy rail internal injury, use.If in steel
Non-metallic inclusion particles are thicker, then plasticity is reduced.String tufted A1 under rail level epidermis2O3Field trash concentrates part easily to produce
Stress concentration, is the root for producing fatigue crack.
There is flaw detection to require in Properties of Heavy Rail Steel inspection project, if unqualified, the lighter's degradation severe one report of detecting a flaw occurs in heavy rail finished product
It is useless.Because the tundish of rectangular bloom casting machine conventional at present uses sliding plate flow-control mode, cause heavy rail fault detection it is unqualified it is main with
The flaw detection of tail base is unqualified more, and main cause is that afterbody is mingled with content height.In order to which the flaw detection qualification rate for improving tail base is often all adopted
With the mode of increase tail base resection length, waste serious.
The content of the invention
The Properties of Heavy Rail Steel tail base casting method without skimming device tundish is used the invention provides a kind of, it is adaptable to rectangular bloom
Casting machine, is operated by the way of control pulling rate VTOL function, skimming device is not set in tundish, reaches reduction Properties of Heavy Rail Steel tail base folder
It is miscellaneous, improve the purpose of tail base flaw detection qualification rate.
In order to achieve the above object, the present invention is realized using following technical scheme：
It is a kind of to use the Properties of Heavy Rail Steel tail base casting method without skimming device tundish, comprise the following steps：
1) on rectangular bloom casting machine during last tank molten steel of production casting, quick lime, raw stone are added into tundish successively
Grey addition is 3~4kg/t steel, it is ensured that the tundish top slag crust when ladle stops casting；Gear is not set in the tundish
Slag wall, slag weir, dam and Casting tube, trough casting mouthful set casting gate barricade；
2) casting machine respectively flows stopping to pulling rate before crystallizer casting more than or equal to 0.5m/min, and tundish liquid level exists
More than 300mm, pulling rate is directly dropped below equal to 0.2m/min when stopping casting, and keeps the pulling rate to continue to that base tail goes out knot
Mouth under brilliant device, then directly rises pulling rate to 0.5~0.8m/min, and keep the pulling rate to go out two cold-zones to base tail.
The casting gate barricade is U-shaped barricade, in addition to the middle hand-hole that middle metope centre is opened up, both sides metope
Lower section respectively symmetrically opens up semicircular hand-hole one and hand-hole two.
Compared with prior art, the beneficial effects of the invention are as follows：
1) it is applied in actual production, tail base flaw detection qualification rate brings up to 96.8% from 85.3%；
2) tundish does not set skimming device, reduces and is mingled with increase because skimming device etc. is corrosional, simultaneously because
There is no skimming device, molten steel keeps highly identical in tundish after ladle stops casting, it is easy to form effective flowing；
3) by the way of VTOL function pulling rate, without considering covering slag thickness problem in crystallizer；
4) tail base resection is reduced to 2 meters from 3.5 meters, improves lumber recovery.
Brief description of the drawings
Fig. 1 is the structural representation of casting gate barricade of the present invention.
Fig. 2 is the overlooking the structure diagram of tundish of the present invention.
In figure：1. the middle hand-hole two of 3. hand-hole of hand-hole 1 of casting gate barricade 2.
Embodiment
The embodiment to the present invention is described further below in conjunction with the accompanying drawings：
It is a kind of to use the Properties of Heavy Rail Steel tail base casting method without skimming device tundish, comprise the following steps：
1) when last secondary tank molten steel is poured in production on rectangular bloom casting machine, quick lime, raw stone are added into tundish successively
Grey addition is 3~4kg/t steel, it is ensured that the tundish top slag crust when ladle stops casting；Gear is not set in the tundish
Slag wall, slag weir, dam and Casting tube, trough casting mouthful set casting gate barricade 1；
2) casting machine respectively flows stopping to pulling rate before crystallizer casting more than or equal to 0.5m/min, and tundish liquid level exists
More than 300mm, pulling rate is directly dropped below equal to 0.2m/min when stopping casting, and keeps the pulling rate to continue to that base tail goes out knot
Mouth under brilliant device, then directly rises pulling rate to 0.5~0.8m/min, and keep the pulling rate to go out two cold-zones to base tail.
The quick lime is the technical grade quick lime of general standard, calcium oxide content more than 97%.
See Fig. 1, be the structural representation of casting gate barricade of the present invention.The casting gate barricade 1 is U-shaped barricade, is removed
Outside the middle hand-hole 2 that middle metope centre is opened up, semicircular hand-hole 1 is respectively symmetrically opened up below the metope of both sides
With hand-hole 24.
See Fig. 2, be the overlooking the structure diagram of tundish of the present invention.Because tundish do not set slag blocking wall, slag weir,
The skimming devices such as dam and Casting tube, therefore set casting gate barricade 1 in casting gate and play pushing off the slag and drainage.During casting,
Molten steel is shunted by the middle hand-hole 2 and the hand-hole 1 on both sides, hand-hole 24 on weir and dam in tundish 1, then passed through
Filling pipe end enters in tundish.
Following examples are implemented lower premised on technical solution of the present invention, give detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
It is conventional method not mentionlet alone bright.
【Embodiment 1】
When last secondary tank molten steel is poured in production on rectangular bloom casting machine, quick lime, quick lime are added into tundish successively
Addition is 3kg/t steel, it is ensured that the tundish top slag crust when ladle stops casting；Do not set in the tundish slag blocking wall,
Slag weir, dam and Casting tube, trough casting mouthful set casting gate barricade 1；
Casting machine respectively flows pulling rate 0.5m/min, tundish liquid level 300mm before stopping is cast to crystallizer, when stopping casting
Pulling rate is directly reduced to 0.2m/min, and keeps the pulling rate to continue to that base tail goes out mouth under crystallizer, then directly rises pulling rate and arrives
0.5m/min, and keep the pulling rate to go out two cold-zones to base tail.
Trail billet cut length 2m, finished product is qualified through flaw detection.
Claims (2)
1. a kind of use the Properties of Heavy Rail Steel tail base casting method without skimming device tundish, it is characterised in that comprises the following steps：
1) quick lime is added into tundish successively, quick lime adds during last tank molten steel of production casting on rectangular bloom casting machine
Enter amount for 3~4kg/t steel, it is ensured that the tundish top slag crust when ladle stops casting；Do not set in the tundish slag blocking wall,
Slag weir, dam and Casting tube, trough casting mouthful set casting gate barricade；
2) casting machine respectively flow stopping to crystallizer cast before pulling rate be more than or equal to 0.5m/min, tundish liquid level 300mm with
On, pulling rate is directly dropped below equal to 0.2m/min when stopping casting, and keeps the pulling rate to continue to that base tail goes out under crystallizer
Mouthful, pulling rate is then directly risen to 0.5~0.8m/min, and keeps the pulling rate to go out two cold-zones to base tail.
2. it is according to claim 1 a kind of using the Properties of Heavy Rail Steel tail base casting method without skimming device tundish, its feature
It is, the casting gate barricade is U-shaped barricade, in addition to the middle hand-hole that middle metope centre is opened up, under the metope of both sides
Side respectively symmetrically opens up semicircular hand-hole one and hand-hole two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410497942.5A CN105436451B (en) | 2014-09-25 | 2014-09-25 | Heavy rail steel tail blank casting method adopting tundish without slag stopping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410497942.5A CN105436451B (en) | 2014-09-25 | 2014-09-25 | Heavy rail steel tail blank casting method adopting tundish without slag stopping device |
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| Publication Number | Publication Date |
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| CN105436451A CN105436451A (en) | 2016-03-30 |
| CN105436451B true CN105436451B (en) | 2017-08-11 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109014106B (en) * | 2017-06-12 | 2020-07-21 | 上海梅山钢铁股份有限公司 | Capping method for reducing finishing amount of slab continuous casting tail blank and improving temperature of blank tail |
| CN111438343B (en) * | 2019-01-16 | 2021-08-13 | 宝山钢铁股份有限公司 | Tool for preventing continuous casting final pouring rising accident and preventing method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58163551A (en) * | 1982-03-20 | 1983-09-28 | Nippon Steel Corp | Horizontal continuous casting method |
| CN1024263C (en) * | 1991-06-07 | 1994-04-20 | 北京科技大学 | Device for preventing generation of coiled slag at affluent mouth of steel ladle and middle tank |
| CN1050157C (en) * | 1996-05-27 | 2000-03-08 | 宝山钢铁(集团)公司 | Reversal-fixation method for continuous production of composite plate stripe |
| CN202087798U (en) * | 2010-12-23 | 2011-12-28 | 新疆八一钢铁股份有限公司 | Improved slag wall used in wrapped and continuous casting |
| CN102443670B (en) * | 2011-12-07 | 2015-12-09 | 鞍钢股份有限公司 | Heavy rail steel sulfur content control method |
| CN202684000U (en) * | 2012-07-20 | 2013-01-23 | 济南麦哈勃冶金技术开发有限公司 | Slag blocking wall with long service life |
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