CN105436451A - 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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- CN105436451A CN105436451A CN201410497942.5A CN201410497942A CN105436451A CN 105436451 A CN105436451 A CN 105436451A CN 201410497942 A CN201410497942 A CN 201410497942A CN 105436451 A CN105436451 A CN 105436451A
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- casting
- tundish
- tail
- pulling rate
- heavy rail
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- 238000005266 casting Methods 0.000 title claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 19
- 239000002893 slag Substances 0.000 title claims abstract description 19
- 239000010959 steel 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 23
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 12
- 239000000292 calcium oxide Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 9
- 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
- 230000002950 deficient Effects 0.000 description 3
- 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
- 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
- 230000003749 cleanliness Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000002615 epidermis Anatomy 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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- Continuous Casting (AREA)
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, particularly relate to a kind of Properties of Heavy Rail Steel tail base casting method adopted without skimming device tundish.
Background technology
Properties of Heavy Rail Steel is the steel grade that production nominal weight is more than or equal to 30kg/m rail, and China mainly refers to the steel grade that the heavy rail producing 60kg/m ~ 75kg/m uses.Heavy rail will bear the effect of pressure, shock loading and frictional force when rolling stock runs, so require enough intensity, hardness and certain toughness.For ensureing the quality of Properties of Heavy Rail Steel, have strict requirement to the cleanliness factor of steel, the field trash in steel causes the main cause producing fatigue rupture in heavy rail internal injury, use.If nonmetallic inclusionsin steel particle is thicker, then plasticity reduces.Tufted Al is gone here and there under rail level epidermis
2o
3field trash is concentrated part easily to produce stress and is concentrated, and is the root producing fatigue crack.
Have flaw detection requirement in Properties of Heavy Rail Steel Interventions Requested, if heavy rail finished product occurs that flaw detection is defective, the lighter's severe one of demoting is scrapped.Because the tundish of rectangular bloom casting machine conventional at present adopts sliding plate flow-control mode, cause heavy rail fault detection defective mainly defective more with the flaw detection of tail base, it is high that main cause is that afterbody is mingled with content.In order to the flaw detection qualification rate improving tail base often all adopts the mode increasing tail base resection length, waste is serious.
Summary of the invention
The invention provides a kind of Properties of Heavy Rail Steel tail base casting method adopted without skimming device tundish, be applicable to rectangular bloom casting machine, adopt the mode controlling pulling rate VTOL function to operate, in tundish, do not establish skimming device, reach minimizing Properties of Heavy Rail Steel tail base to be mingled with, improve the object of tail base flaw detection qualification rate.
In order to achieve the above object, the present invention realizes by the following technical solutions:
Adopt the Properties of Heavy Rail Steel tail base casting method without skimming device tundish, comprise the steps:
1) when on rectangular bloom casting machine, last tank molten steel secondary is watered in production, in tundish, add quick lime successively, quick lime addition is 3 ~ 4kg/t steel, ensures the tundish top slag crust when ladle stops casting; Do not establish slag blocking wall, slag weir, dam and Casting tube in described tundish, trough casting mouth establishes casting gate barricade;
2) casting machine respectively flows and stops pulling rate before crystallizer casting to be more than or equal to 0.5m/min, tundish liquid level is at more than 300mm, when stopping casting, pulling rate is directly reduced to and is less than or equal to 0.2m/min, and base tail goes out crystallizer end opening to keep this pulling rate to last till, then directly rise pulling rate to 0.5 ~ 0.8m/min, and keep this pulling rate to go out two cold-zones to base tail.
Described casting gate barricade is U-shaped barricade, and except the centre note hand-hole that middle metope centre is offered, below the metope of both sides, symmetry offers semicircular hand-hole one and hand-hole two respectively.
Compared with prior art, the invention has the beneficial effects as follows:
1) be applied in actual production, tail base flaw detection qualification rate brings up to 96.8% from 85.3%;
2) tundish does not establish skimming device, decreases and is mingled with increase because skimming device etc. is corrosional, and simultaneously owing to not having skimming device, after ladle stops casting, in tundish, molten steel keeps highly identical, is easy to be formed effective flowing;
3) mode of VTOL function pulling rate is adopted, without the need to considering covering slag thickness problem in crystallizer;
4) tail base resection reduces to 2 meters from 3.5 meters, improves lumber recovery.
Accompanying drawing explanation
Fig. 1 is the structural representation of casting gate barricade of the present invention.
Fig. 2 is the plan structure schematic diagram of tundish of the present invention.
In figure: 1. casting gate barricade 2. centre note hand-hole 3. hand-hole 1 hand-hole 2 5. tundish 6. filling pipe end
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Adopt the Properties of Heavy Rail Steel tail base casting method without skimming device tundish, comprise the steps:
1) when on rectangular bloom casting machine, last tank molten steel secondary is watered in production, in tundish 5, add quick lime successively, quick lime addition is 3 ~ 4kg/t steel, ensures that tundish 5 pushes up slag crust when ladle stops casting; Do not establish slag blocking wall, slag weir, dam and Casting tube in described tundish 5, trough casting mouth establishes casting gate barricade 1;
2) casting machine respectively flows and stops pulling rate before crystallizer casting to be more than or equal to 0.5m/min, tundish 5 liquid level is at more than 300mm, when stopping casting, pulling rate is directly reduced to and is less than or equal to 0.2m/min, and base tail goes out crystallizer end opening to keep this pulling rate to last till, then directly rise pulling rate to 0.5 ~ 0.8m/min, and keep this pulling rate to go out two cold-zones to base tail.
Described quick lime is the technical grade quick lime of general standard, calcium oxide content more than 97%.
Seeing Fig. 1, is the structural representation of casting gate barricade of the present invention.Described casting gate barricade 1 is U-shaped barricade, and except the centre note hand-hole 2 that middle metope centre is offered, below the metope of both sides, symmetry offers semicircular hand-hole 1 and hand-hole 24 respectively.
Seeing Fig. 2, is the plan structure schematic diagram of tundish of the present invention.Because tundish 5 does not establish skimming device and the Casting tube such as slag blocking wall, slag weir, dam, therefore casting gate barricade 1 is established to play pushing off the slag and drainage at casting gate.During casting, molten steel is shunted by the hand-hole 1 on the centre note hand-hole 2 on weir and dam in tundish 1 and both sides, hand-hole 24, then is entered in tundish 5 by filling pipe end 6.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.
[embodiment 1]
When on rectangular bloom casting machine, last tank molten steel secondary is watered in production, in tundish 5, add quick lime successively, quick lime addition is 3kg/t steel, ensures that tundish 5 pushes up slag crust when ladle stops casting; Do not establish slag blocking wall, slag weir, dam and Casting tube in described tundish 5, trough casting mouth establishes casting gate barricade 1;
Casting machine respectively flows and stops pulling rate 0.5m/min before crystallizer casting, tundish 5 liquid level 300mm, when stopping casting, pulling rate is directly reduced to 0.2m/min, and base tail goes out crystallizer end opening to keep this pulling rate to last till, then directly rise pulling rate to 0.5m/min, and keep this 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. adopt the Properties of Heavy Rail Steel tail base casting method without skimming device tundish, it is characterized in that, comprise the steps:
1) when on rectangular bloom casting machine, last tank molten steel secondary is watered in production, in tundish, add quick lime successively, quick lime addition is 3 ~ 4kg/t steel, ensures the tundish top slag crust when ladle stops casting; Do not establish slag blocking wall, slag weir, dam and Casting tube in described tundish, trough casting mouth establishes casting gate barricade;
2) casting machine respectively flows and stops pulling rate before crystallizer casting to be more than or equal to 0.5m/min, tundish liquid level is at more than 300mm, when stopping casting, pulling rate is directly reduced to and is less than or equal to 0.2m/min, and base tail goes out crystallizer end opening to keep this pulling rate to last till, then directly rise pulling rate to 0.5 ~ 0.8m/min, and keep this pulling rate to go out two cold-zones to base tail.
2. a kind of Properties of Heavy Rail Steel tail base casting method adopted without skimming device tundish according to claim 1, it is characterized in that, described casting gate barricade is U-shaped barricade, except the centre note hand-hole that middle metope centre is offered, below the metope of both sides, symmetry offers semicircular hand-hole one and hand-hole two respectively.
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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN105436451B CN105436451B (en) | 2017-08-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014106A (en) * | 2017-06-12 | 2018-12-18 | 上海梅山钢铁股份有限公司 | It reduces sheet billet continuous casting tail base finishing amount and improves the method for capping of base tail temperature |
| CN111438343A (en) * | 2019-01-16 | 2020-07-24 | 宝山钢铁股份有限公司 | Tool for preventing continuous casting final pouring rising accident and preventing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS631147B2 (en) * | 1982-03-20 | 1988-01-11 | Nippon Steel Corp | |
| CN1067597A (en) * | 1991-06-07 | 1993-01-06 | 北京科技大学 | Prevent that ladle and middle pot drainage opening from going out the device of volume slag in the stream |
| CN1141962A (en) * | 1996-05-27 | 1997-02-05 | 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 |
| CN102443670A (en) * | 2011-12-07 | 2012-05-09 | 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 |
-
2014
- 2014-09-25 CN CN201410497942.5A patent/CN105436451B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS631147B2 (en) * | 1982-03-20 | 1988-01-11 | Nippon Steel Corp | |
| CN1067597A (en) * | 1991-06-07 | 1993-01-06 | 北京科技大学 | Prevent that ladle and middle pot drainage opening from going out the device of volume slag in the stream |
| CN1141962A (en) * | 1996-05-27 | 1997-02-05 | 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 |
| CN102443670A (en) * | 2011-12-07 | 2012-05-09 | 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109014106A (en) * | 2017-06-12 | 2018-12-18 | 上海梅山钢铁股份有限公司 | It reduces sheet billet continuous casting tail base finishing amount and improves the method for capping of base tail temperature |
| 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 |
| CN111438343A (en) * | 2019-01-16 | 2020-07-24 | 宝山钢铁股份有限公司 | Tool for preventing continuous casting final pouring rising accident and preventing method thereof |
| 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 |
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| CN105436451B (en) | 2017-08-11 |
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