CN204639117U - A kind of wide cut 300 is stainless steel tundish immersed nozzle - Google Patents
A kind of wide cut 300 is stainless steel tundish immersed nozzle Download PDFInfo
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- CN204639117U CN204639117U CN201520324691.0U CN201520324691U CN204639117U CN 204639117 U CN204639117 U CN 204639117U CN 201520324691 U CN201520324691 U CN 201520324691U CN 204639117 U CN204639117 U CN 204639117U
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Abstract
It is stainless steel tundish immersed nozzle that the utility model discloses a kind of wide cut 300, mouth of a river internal holes is conical bore, the internal diameter of conical bore reduces from top to bottom gradually, conical bore top is communicated with tundish, be respectively equipped with two mouth of a river side openings bottom conical bore, mouth of a river side opening is arranged for being inclined upwardly 10 °; Conical bore inside is provided with two set squares, and two set squares are symmetrically distributed in conical bore, and set square is slant setting, and the top of set square is crossing with slide plate end face, and the bottom of set square is crossing with bottom conical bore; Forming mouth of a river groove bottom the side opening of the mouth of a river, is base plate below groove.The utility model has reduction wide cut 300 and is stainless steel liquid level fluctuation of crystallizer, prevents casting process slag and reduce the advantages such as continuous casting billet blemish.
Description
Technical field
It is stainless steel tundish immersed nozzle that the utility model relates to a kind of wide cut 300, belongs to steel-making continuous casting technical field.
Background technology
Continuous cast mold operation conditions directly affects continuous casting production efficiency and product quality, and molten steel in mold flow condition directly affects final slab quality, unreasonable flow field not only will cause crystallizer molten steel surface flow velocity excessive. and meniscus turbulence aggravates, cause slag, and can cause impacting excessive to solidified shell, make field trash and bubble easily be solidified base shell to catch, affect continuous casting billet quality accident, and in crystallizer, flow condition is directly related with parameters such as crystallizer size, submersed nozzle parameter, pulling rates.For 200mm thickness 1900mm above width crystallizer flow field, the large technology difficulty of flakiness ratio increases, under the parameter of the identical mouth of a river, liquid level fluctuation of crystallizer is large, cc billet surface quality worsens serious, be for stainless steel for 300, because its matrix is austenite, a certain amount of interrupted high temperature precipitated phase is had along crystal boundary in microscopic structure, it is little compared with straight carbon steel thickness that continuous casting billet goes out heating furnace rear oxidation iron sheet, as being heated to 1240 DEG C containing Mo austenitic stainless steel 316 L steel continuous casting billet, place 30 seconds rear oxidation thickness of scale only 0.5mm, this thickness can not meet removes continuous casting billet effects of surface defects, if continuous casting billet blemish is obvious, then heat rear surface and easily there is residual defects.For this reason, exploitation wide cut 300 is stainless steel tundish immersed nozzle, to improve crystallizer flow field state, most important to raising continuous cast products quality.
Summary of the invention
The utility model provides a kind of wide cut 300 to be stainless steel tundish immersed nozzle, and belong to back taper endoporus, endoporus arranges two pieces of set squares, rectangle side opening, updip 10 ° of inclination angles, the thick die bed mouth of a river of flat pattern groove.This mouth of a river is split type tundish immersed nozzle.
The technical solution adopted in the utility model is: a kind of wide cut 300 is stainless steel tundish immersed nozzle, top, the mouth of a river is slide plate, it is cylindrical structure in the middle part of the mouth of a river, seamlessly transitted by sphenoid between slide plate and cylinder, inside, the mouth of a river is provided with hole, it is characterized in that: described mouth of a river internal holes is conical bore, the internal diameter of conical bore reduces from top to bottom gradually, conical bore top is communicated with tundish, is respectively equipped with two mouth of a river side openings bottom conical bore, and mouth of a river side opening is arranged for being inclined upwardly 10 °; Conical bore inside is provided with two set squares, and two set squares are symmetrically distributed in conical bore, and set square is slant setting, and the top of set square is crossing with slide plate end face, and the bottom of set square is crossing with bottom conical bore; Forming mouth of a river groove bottom the side opening of the mouth of a river, is base plate below groove.
Described slide plate is rectangular structure, and the end face of slide plate is the rectangular surfaces of 199mm × 209mm, and thickness is 39mm.
The top of described conical bore is the circular hole of Φ 70mm, and base diameter reduces to Φ 68mm, in back taper.
Described mouth of a river side opening is slot, and the length of slot is 65mm, and wide is 43mm.
The wide cut 300 that the utility model provides is stainless steel tundish immersed nozzle, liquid level stabilizing can be realized control, slag interface temperature is rationally even, and the function such as lower crystallizer beam impact depth, to preventing continuous casting billet slag, scabbing and promoting that inclusion floating etc. all has good result.
The utility model is applicable to 200mm thickness, the wide cut 300 of more than 1900mm width is that stainless steel continuous casting is produced, and after implementing, wide cut 300 is that surface defect of stainless steel casting blank rate declines more than 80%, and cold rolling coil inclusion defect rate declines more than 60%.
Below in conjunction with drawings and Examples, the utility model is described further.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model (analysing and observe).
Fig. 2 is the structural representation (partial enlargement) of mouth of a river side opening in Fig. 1.
Fig. 3 is the left view of Fig. 1.
Fig. 4 is the sectional view (partial enlargement) along A-A line in Fig. 1.
In figure: 1 is slide plate, 2 is sphenoid, and 3 is cylinder, and 4 is conical bore, and 5 is set square, and 6 is side opening, and 7 is groove, and 8 is base plate, and 9 is slag line district.
Detailed description of the invention
Embodiment:
As shown in Fig. 1 ~ 4, a kind of wide cut 300 is stainless steel tundish immersed nozzle, top, the mouth of a river is slide plate 1, is cylinder 3, is seamlessly transitted between slide plate 1 and cylinder 3 by sphenoid 2 in the middle part of the mouth of a river, inside, the mouth of a river is provided with hole, described mouth of a river internal holes is conical bore 4, and the internal diameter of conical bore 4 reduces from top to bottom gradually, and conical bore 4 top is communicated with tundish, be respectively equipped with two mouth of a river side openings 6 bottom conical bore 4, mouth of a river side opening 6 is arranged for being inclined upwardly 10 °; Conical bore 4 inside is provided with two set squares, 5, two set squares 5 and is symmetrically distributed in conical bore 4, and set square 5 is slant setting, and the top of set square 5 is crossing with slide plate 1 end face, and the bottom of set square 5 is crossing with bottom conical bore 4; Forming mouth of a river groove 7 bottom mouth of a river side opening 6, is base plate 8 below groove 7.
Described slide plate 1 is rectangular structure, and the end face of slide plate 1 is the rectangular surfaces of 199mm × 209mm, and thickness is 39mm.
The top of described conical bore 4 is the circular hole of Φ 70mm, and base diameter reduces to Φ 68mm, in back taper.
Described mouth of a river side opening 6 is slot, and the length of slot is 65mm, and wide is 43mm.
Mouth of a river basic material Al content >=70%, C content >=3%, mouth of a river side opening 6 top 80mm-265mm is slag line district 9(slag line district is the part that the mouth of a river is positioned at crystallizer slag interface, because cast width is different, mouth of a river insertion depth has certain change, therefore slag lining has certain altitude, it act as by using special substance such as ZrO layer to improve Slag resistance ability, prevent mouth of a river fracture in use procedure, continuous casting is caused to proceed), slag line district outer ring 6mm is thick is ZrO floor, ZrO content >=90%.Mouth of a river bulk density>=2.65g/cm
3, apparent porosity (after destructive distillation)≤10%.
Concrete implementation method is:
This example steel grade is stainless steel for 304, steel grades C :≤0.07%, Si :≤0.75%, Mn :≤2.00%, P :≤0.045%, S :≤0.015%, Cr:18.00-20.00%, Ni:8.00-10.50%, N :≤0.10%.Continuous-casting steel pouring specification 200mm(is thick) × 2040mm(is wide), continuous pouring stove number 6 stove.Casting process uses the invention mouth of a river, and mouth of a river insertion depth setting 160mm, process does not change slag line, waters steel constant speed 0.85m/min.For judging that the mouth of a river is good and bad, liquid level fluctuation of crystallizer size, Inclusion of Continuous Casting Billet thing quantity and size and the index such as continuous casting billet blemish kind and quantity need be measured, specific as follows:
(1) liquid level fluctuation of crystallizer size measurement
Electromagnetic induction method is used to measure liquid level fluctuation of crystallizer situation and data feedback will be detected to PLC system, depart from balance position size by software systems mensuration steel pouring process crystallizer molten steel surface and be considered as certain moment liquid fluctuating size, 0-1mm, 1-2mm, 2-3mm and more than 3mm point of four class intervals are pressed to fluctuation size, adds up whole steel pouring process liquid fluctuating and be positioned at each interval scale judge line stability.
To use invention mouth of a river liquid fluctuating 0-1mm ratio to be 92.35%, 1-2mm ratio be 5.87%, 2-3mm ratio be 1.78%, more than 3mm ratio is 0, and respond well, the liquid fluctuating do not occurred because mouth of a river problem causes increases phenomenon.
(2) Inclusion of Continuous Casting Billet thing quantity and size
The company of choosing waters the 3rd stove the 3rd block casting base and cuts 80mm thickness sample in strand cutting tip, in sample, 50mm × 50mm × 50mm sample 6 pieces is got at keep to the side portion and middle part of outer arc and core respectively, sampling point is shown in Fig. 2, utilizes ESEM to measure inclusion size and quantity.Result shows 5-10 μm of the amount of inclusions 21,10-15 μm of the amount of inclusions 7,15-20 μm of the amount of inclusions 2,20-30 μm of the amount of inclusions 1, do not find more than 30 μm field trashes, strand degree of purity is good, and the slag phenomenon because mouth of a river problem causes does not occur.
(3) continuous casting billet blemish kind and quantity
Carry out air cooling to casting blank surface temperature reach less than 50 DEG C by being cut into the long strand of 10000mm, check its surface, result shows that casting billet surface is good, do not occur because of casting billet surface that mouth of a river problem causes scab, the problem such as depression.
In conjunction with said determination result, the wide cut 300 using invention is that stainless steel tundish immersed nozzle is respond well.
Claims (4)
1. a wide cut 300 is stainless steel tundish immersed nozzle, top, the mouth of a river is slide plate, it is cylindrical structure in the middle part of the mouth of a river, seamlessly transitted by sphenoid between slide plate and cylinder, inside, the mouth of a river is provided with hole, it is characterized in that: described mouth of a river internal holes is conical bore, the internal diameter of conical bore reduces from top to bottom gradually, conical bore top is communicated with tundish, is respectively equipped with two mouth of a river side openings bottom conical bore, and mouth of a river side opening is arranged for being inclined upwardly 10 °; Conical bore inside is provided with two set squares, and two set squares are symmetrically distributed in conical bore, and set square is slant setting, and the top of set square is crossing with slide plate end face, and the bottom of set square is crossing with bottom conical bore; Forming mouth of a river groove bottom the side opening of the mouth of a river, is base plate below groove.
2. wide cut 300 according to claim 1 is stainless steel tundish immersed nozzle, it is characterized in that: described slide plate is rectangular structure, and the end face of slide plate is the rectangular surfaces of 199mm × 209mm, and thickness is 39mm.
3. wide cut 300 according to claim 1 is stainless steel tundish immersed nozzle, it is characterized in that: the top of described conical bore is the circular hole of Φ 70mm, and base diameter reduces to Φ 68mm, in back taper.
4. wide cut 300 according to claim 1 is stainless steel tundish immersed nozzle, it is characterized in that: described mouth of a river side opening is slot, and the length of slot is 65mm, and wide is 43mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520324691.0U CN204639117U (en) | 2015-05-20 | 2015-05-20 | A kind of wide cut 300 is stainless steel tundish immersed nozzle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520324691.0U CN204639117U (en) | 2015-05-20 | 2015-05-20 | A kind of wide cut 300 is stainless steel tundish immersed nozzle |
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| CN204639117U true CN204639117U (en) | 2015-09-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110586891A (en) * | 2019-09-30 | 2019-12-20 | 河钢股份有限公司 | Method for evaluating liquid level control precision of continuous casting crystallizer |
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- 2015-05-20 CN CN201520324691.0U patent/CN204639117U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110586891A (en) * | 2019-09-30 | 2019-12-20 | 河钢股份有限公司 | Method for evaluating liquid level control precision of continuous casting crystallizer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |