CN102294451A - Method for enhancing strip casting quality - Google Patents
Method for enhancing strip casting quality Download PDFInfo
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- CN102294451A CN102294451A CN2010102113260A CN201010211326A CN102294451A CN 102294451 A CN102294451 A CN 102294451A CN 2010102113260 A CN2010102113260 A CN 2010102113260A CN 201010211326 A CN201010211326 A CN 201010211326A CN 102294451 A CN102294451 A CN 102294451A
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Abstract
The invention provides a method for enhancing the strip casting quality. In the method, an enclosed chamber is formed above a molten metal melting pool formed by encircling two casting rollers and a side dam; inert gas is introduced into the enclosed chamber; a slag blocking weir is formed inside the melting pool enclosed chamber, floats in molten steel, is made of a refractory material, and can move upwards and downwards along with the fluctuation of the liquid level of the melting pool; the lowermost part of the slag blocking weir is positioned on the upper part of two phase areas of the molten steel in the melting pool; and floating slag on the surface of the melting pool is isolated from the roller surface of a casting roller by using the slag blocking weir in the melting pool, so that the floating slag is prevented from being involved into a casting strip, and the strip casting quality is improved. The method is suitable for dual roller strip casting production of strip steel with the thickness of 1-5 millimeters.
Description
Technical field
The present invention relates to continuous casting technology, particularly a kind of raising thin strap continuous casting Cast Strip method for quality.
Background technology
The twin-roll thin strip continuous casting technology is a kind of advanced person's a short flow process metallurgical technology.Its typical example as shown in Figure 1, directly pouring molten steel is relatively rotated by two and has in casting roller 1a, the 1b of quick cooling function and the molten bath 5 that side seal board 2a, 2b surround at one, the peripheral surface that molten steel in the molten bath is rotated at the casting roller is cooled and solidifies, and then form solidified shell and gradually growth be pressed together at two crystallization roller 1a, minimum place, 1b roll gap crack then, form band 4, the roll surface cleaning plant 3,3 ' in the casting roller outside is cleared up the oxide impurity of roll surface in real time.
In the production process of thin strap continuous casting, if have metal or nonmetallic compound scum silica frost that molten steel oxidation thing and refractory material are produced by the molten steel erosion in the molten bath that casting roller 1a, 1b and side seal board 2a, 2b surround, then, scum silica frost influence the uniformity of solidifying of molten steel with understanding after the casting roller contact, and then scum silica frost zone coagulation defect such as can crack, loosen is arranged on the Cast Strip.In order to obtain high-quality Cast Strip, must control and clear up the scum silica frost in the molten bath.
The at present disclosed method of handling and controlling about the thin belt continuous casting molten pool surface scum mainly concentrates on two aspects; a kind of is to adopt confined chamber to add the gas protection to prevent that weld pool surface from forming scum silica frost and the cold steel solidified shell of local surfaces; the oxide scum silica frost that adopts the confined chamber that has protective gas can avoid the secondary oxidation of steel in the molten bath to produce on top, molten bath; can utilize simultaneously confined chamber to utilize the radiant heat in the molten bath to keep the temperature in zone, molten bath; avoid weld pool surface to generate cold steel; as Chinese patent CN1561272A (US7021364); this method is more common feasible method, but only can't reach the purpose that scums by the passive molten steel oxidation that prevents.
Another kind of method of often seeing is to adopt some special device to prevent that slag is rolled in the Cast Strip, as Chinese patent CN1561272A, CN1503705A, CN1289233C and Japan Patent JP2001078563 etc.Also some method is initiatively to scum and the patent of bath surface scull, as Korean Patent KR 2008059992 etc.
Existing thin strap continuous casting direct casting process patent contrast is as follows:
The at present disclosed method of handling and controlling about the thin belt continuous casting molten pool surface scum mainly concentrates on two aspects; a kind of is to adopt confined chamber to add the gas protection to prevent that weld pool surface from forming scum silica frost and the cold steel solidified shell of local surfaces; this method is more common feasible method, can't handle but corrode the scum silica frost that produces for refractory material in molten steel.
The method and the mechanism of a kind of airtight twin roll thin strip casting pool of mentioning among the Chinese patent CN1561272A (US7021364), design has logical inert gas and degassing function, has avoided inert gas contaminated, has prevented that oxidizing gas is involved in;
The scum silica frost and the molten steel scull of Korean Patent KR 2008059992 usefulness bath surfaces observation camera inspection bath surface, melt these sculls by the rising bath surface then, reach the purpose that scums with scull, in actual job, adopt similar approach will increase the probability of Cast Strip fracture.Influence the casting strip quality in the level fluctuation process.
Korean Patent KR2001055242 adopts to open and waters the initial stage control liquid level delivery port that is higher or lower than the mouth of a river that fluctuates up and down and make that scum silica frost is taken the lead to take away, and improves casting strip quality with this.
And another kind is under the situation in airtight molten bath, adopts some special device to prevent that slag is rolled in the Cast Strip.
Method described in Chinese patent CN1503705A is in airtight molten bath and is connected with under the situation of inert gas shielding, utilization prevents that along the intrusive mood resistance slag weir that casting roller width is arranged in the current distribution device both sides scum silica frost of weld pool surface is involved in the Cast Strip in the casting cycle, and lift resistance slag weir in each stage of closing to an end of curling, be beneficial in the Cast Strip that scum silica frost is involved in the tail band; Another kind of scheme is to cast roller or both sides casting roller air blowing in opposite directions in the stage that closes to an end of curling at each to a side, so that the weld pool surface scum silica frost is involved in the Cast Strip.Afterwards, keep the quality of whole volume Cast Strip by excision Cast Strip afterbody.Method of mentioning among Chinese patent CN1289233C and the Japan Patent JP2002316245 and said method basically identical.
The scheme that Japan Patent JP2002273551 mentions is by ventilation or uses the cooling curing agent to make the scum silica frost of weld pool surface cool off, keeps scull to cover almost whole weld pool surface in casting cycle.
The Control for Oxygen Content of confined chamber is below 1% in the scheme that Japan Patent JP05261488A mentions, and monitors oxygen content in real time, sprays into inert gas.Japan Patent JP05245596A also adopts and uses the same method.
Slag weir tip among the Japan Patent JP05212502A is deep into inside, molten bath and is close to casting roller surface, and the material manufacturing of easily shrinking, the security that can improve side seal board are adopted in slag weir limit portion and side seal board contact position.This way can cause slag weir and solidification of molten steel shell joint to touch, and directly reduces casting strip quality.
The slag weir that Korean Patent KR100798026 adopts the aluminium carbonaceous material to make, be installed on the slag trap fixed mount, vertically be inserted in the molten bath, can slide in the slag trap fixed mount in baffle plate top, move up and down thereby can utilize baffle plate and molten steel density contrast to float in the molten bath and follow the molten metal pool level variation.But do not specify slag weir bottom to be in situation in the molten bath in this patent, can not impact the Cast Strip so can't guarantee slag weir itself.
With regard to thin strap continuous casting technology, producing scum silica frost in so little molten bath is inevitably, if can control the generation of scum silica frost and then eliminate it, then the adverse effect that can avoid scum silica frost that casting strip quality is caused improves casting strip quality.Slag weir inserts in the molten steel, because molten steel contacts with slag weir, also can influence casting strip quality, so the insertion depth of slag weir and position are the keys of design control slag mechanism.Analyze by experiment, molten steel in the molten bath probably can be divided into three parts, molten liquid steel (area I), two district (area I I, the zone that molten steel and scull mix), scull district (area I II), wherein molten steel produces slag weir and corrodes, owing to the slag weir material is and the not close profit of molten steel, erosive velocity is very slow, and the oxide scum silica frost that erosion produces also seldom; Two-phase section contacts with slag weir can have a strong impact on coagulation result, also relatively direct and serious to the influence of casting strip quality.And solidification zone can not contact with slag weir, otherwise the base shell that solidifies can cause the slag weir fracture, in addition, as document " relation of continuous casting of thin strip surface state and bath surface " (go up the island good it: CAMP-ISIJ Vol.5 (1992)-1201), can have a strong impact on casting strip quality if slag weir contacts with the solidification of molten steel district.
So the position of slag weir in the molten bath should be controlled at more than the two-phase section, is in the molten liquid steel, in the molten bath area I promptly shown in Figure 2.This zone is beneficial to the control of scum silica frost, and refractory material does not influence casting strip quality after being corroded by molten steel.
Summary of the invention
The object of the present invention is to provide a kind of raising thin strap continuous casting Cast Strip method for quality, molten steel in the inert gas control molten bath that is connected with by the confined chamber that is installed in thin belt continuous casting molten pool top is oxidized, keep bath temperature, avoids weld pool surface molten steel solidification conjunctiva; And make scum silica frost and casting roller roll surface keep apart by floating over slag weir in the molten bath, and avoid scum silica frost to be involved in the Cast Strip, improve casting strip quality.The present invention is applicable to the strip steel of twin-roll thin strip continuous casting production 1-5mm.
For achieving the above object, technical scheme of the present invention is,
A kind of raising thin strap continuous casting Cast Strip method for quality is installed a confined chamber above two casting molten metal pools that roller and side seal board surrounded of thin strap continuous casting, be connected with inert gas in the confined chamber; In confined chamber inside, molten bath slag weir is installed, slag weir floats in the molten steel of fusion, make by refractory material, can move up and down along with the molten metal pool level fluctuation, the foot of slag weir is in the two-phase section top of molten bath molten steel, and make scum silica frost and casting roller roll surface keep apart by floating over slag weir in the molten bath, and avoid scum silica frost to be involved in the Cast Strip, improve casting strip quality.
The width of described slag weir is less than casting roller width, and its end face and side seal board distance are 15-25mm.
Slag weir tilts to insert in the molten bath, and the degree of depth of the molten steel that submerges behind the slag weir insertion molten bath is greater than level fluctuation amplitude in the casting cycle.
The described slag weir following 10-15mm of molten steel surface that submerges.
The thickness of described slag weir is preferably 8-15mm.
Described confined chamber comprises a top cover and sealing gland cell-type side plate, and the side plate bottom is apart from casting roller roll surface 3-10mm, and its side plate bottom is furnished with uniform pore along casting roll axis direction.
Described side plate pore cross section is horn-like, and the distribution distance between the pore equates.
Described slag weir connects dog screw, the sheathed guide pin bushing of dog screw one end, and guide pin bushing is connected in the fixed mount of confined chamber top cover bottom.
Described dog screw adopts the strong cubic boron nitride material manufacturing of anti-molten steel aggressivity.
Described dog screw is a hollow structure, and guide pin bushing adopts the manufacturing of heat-resistance stainless steel material.
Inert gas in the confined chamber adopts argon gas, makes the concentration of the inner oxygen content of confined chamber less than 2%.
Slag weir is installed in confined chamber inside, molten bath can controls scum silica frost and contact, thereby avoid scum silica frost to be involved in the Cast Strip with crystallization roller roll surface.Slag weir floats in the molten steel of fusion, make by refractory material, can move up and down along with the molten metal pool level fluctuation, be characterized in that the foot of slag weir is in the two-phase section top of molten bath molten steel, its molten steel degree of depth of submerging depends on the version and the weight of slag weir.And the molten bath confined chamber is installed in two casting molten metal pool tops that roller and side seal board surrounded of thin strap continuous casting, and it not only plays sealing function, also has molten bath insulation, anti-oxidation function simultaneously.
Among the present invention; in the confined chamber inside, molten bath that is connected with inert gas shielding slag weir is installed; during slag weir floats over molten steel in the molten bath along casting roll axis direction; can move up and down along with the molten metal pool level fluctuation; be characterized in that the foot of slag weir is in the two-phase section top of molten bath molten steel, in the molten bath area I promptly shown in Figure 2, the scum silica frost of control weld pool surface contacts with crystallization roller roll surface; when avoiding scum silica frost to be involved in the Cast Strip, slag weir itself can not impact casting strip quality.The width of slag weir is less than casting roller width, and its end face and side seal board distance are 15-25mm.Slag weir tilts to insert in the molten bath, and itself and current distribution device outer surface distance are tried one's best big, to guarantee maximized control weld pool surface scum silica frost.Slag weir inserts the degree of depth of the molten steel that submerges behind the molten bath greater than level fluctuation amplitude in the casting cycle, the preferred slag weir following 10-15mm of molten steel surface that submerges.Take all factors into consideration intensity and decay resistance, the thickness of slag weir is preferably 8-15mm.
Dog screw can adopt with slag weir and be threaded, and all adopts the strong cubic boron nitride material manufacturing of anti-molten steel aggressivity, and dog screw is along the guide pin bushing knee-action during level fluctuation, and guide pin bushing then links together with the fixed mount that is fixed on the confined chamber bottom.Because slag weir will float in the molten steel, in order to reduce the weight of slag weir as far as possible, the dog screw of slag weir is a hollow structure.For fear of oxidation, guide pin bushing adopts the manufacturing of heat-resistance stainless steel material.
Be installed in the protective cover of thin belt continuous casting molten pool top and be connected with inert gas, prevent molten steel surface oxidation, maintenance bath temperature in the molten bath in, avoid weld pool surface molten steel solidification conjunctiva.Adopt inert gas as sealing medium between confined chamber and the casting roller roll surface, fundamental method is that the Position Design directly over confined chamber is in roll surface has a sealing gland chamber, bottom, sealing gland chamber is apart from casting roller roll surface 3-10mm, and its underpart is furnished with uniform pore along casting roll axis direction, in order to reduce the impact of gas to weld pool surface, the pore cross section is horn-like, and the distribution distance between the pore equates.Can between sealing gland chamber lower surface and casting roller roll surface, form an inert gas air film, outside the part gas flow confined chamber, in the part gas flow confined chamber, but because can driving the part inert gas, the rotation of casting roller flows to confined chamber inside, so most of inert gas is used to confined chamber inside.
Anti-oxidation inert gas in the confined chamber preferably adopts argon gas, and the concentration of the inner oxygen content of confined chamber is less than 2%.
Major advantage of the present invention
1. the degree of purity of molten steel in the protection thin belt continuous casting molten pool prevents the weld pool surface conjunctiva, improves surface quality of casting belt.
2. slag weir is different from the described method of other patents, follows the liquid level adjustment automatically and has simplified device structure, and can not cause secondary pollution to molten steel in the molten bath.
3. mechanism's simple possible height.
Description of drawings
Fig. 1 is a thin strap continuous casting technology simplified schematic diagram.
Fig. 2 is a basic principle cutaway view of the present invention.
Fig. 3 is a slag weir using method schematic diagram of the present invention.
Fig. 4 is that the B of Fig. 3 is to schematic diagram.
Fig. 5 be the A of Fig. 2 to schematic diagram, confined chamber promptly of the present invention and roll surface sealing gland structural scheme of mechanism.
The specific embodiment
Referring to Fig. 2～Fig. 5, raising thin strap continuous casting of the present invention Cast Strip method for quality is installed a confined chamber 6 above the molten metal pool 5 that two of thin strap continuous castings casting roller 1a, 1b and side seal board 2a, 2b are surrounded, be connected with inert gas in the confined chamber 6; In confined chamber 6 inside slag weir 7 is installed, slag weir 7 floats in the molten steel of fusion, make by refractory material, can move up and down along with the molten metal pool level fluctuation, the foot of slag weir 7 is in the two-phase section top of molten bath 5 molten steel, in the molten bath area I promptly shown in Figure 2, the control scum silica frost contacts with casting roller roll surface, and make scum silica frost and casting roller roll surface keep apart by the slag weirs 7 that float in the molten bath 5, and avoid scum silica frost to be involved in the Cast Strip, improve casting strip quality.
The width of described slag weir 7 is less than casting roller width, and its end face and side seal board distance are 15-25mm.
Slag weir 7 tilts to insert in the molten bath 5, and the degree of depth of the molten steel that submerges behind the slag weir 7 insertion molten baths 5 is greater than level fluctuation amplitude in the casting cycle.The described slag weir following 10-15mm of molten steel surface that submerges, the thickness of described slag weir is preferably 8-15mm.
Described confined chamber 6 comprises a top cover 61 and sealing gland cell-type side plate 62, and side plate 62 bottoms are apart from casting roller roll surface 3-10mm, and its side plate 62 bottoms are furnished with uniform pore 621 along casting roll axis direction.Described side plate pore cross section is horn-like, and the distribution distance between the pore equates.
Described slag weir 7 connects dog screw 8, and dog screw 8 one ends are enclosed within guide pin bushing 9, and guide pin bushing 9 is connected in the fixed mount 10 of confined chamber top cover 61 bottoms.
Described dog screw adopts the strong cubic boron nitride material manufacturing of anti-molten steel aggressivity, and this dog screw is a hollow structure, and guide pin bushing adopts the manufacturing of heat-resistance stainless steel material.
Inert gas in the confined chamber adopts argon gas, makes the concentration of the inner oxygen content of confined chamber less than 2%.
Before the casting beginning, carry out the installation of current distribution device 11, after this anti-oxidation inert gas that inside is passed through in the confined chamber 6 preferably adopts argon gas, and the concentration of oxygen content is less than 1%.Molten steel enters after the molten bath 5 by the mouth of a river 12 and current distribution device 11, slag weir 7 swims in the molten steel, and moves up and down along with the molten metal pool level fluctuation, and the foot of slag weir 7 is in the two-phase section top of molten bath molten steel, be in the molten bath area I shown in Figure 2, the control scum silica frost with cast the roller roll surface and contact.Slag weir 7 end faces and side seal board distance be 20mm, in the 45 ° of insertion molten baths 5 that tilt, and the slag weir 7 following 15mm of molten steel surface that submerges.
Claims (11)
1. one kind is improved thin strap continuous casting Cast Strip method for quality, above two casting molten metal pools that roller and side seal board surrounded of thin strap continuous casting a confined chamber is installed, and is connected with inert gas in the confined chamber; In confined chamber inside, molten bath slag weir is installed, slag weir floats in the molten steel of fusion, make by refractory material, can move up and down along with the molten metal pool level fluctuation, the foot of slag weir is in the two-phase section top of molten bath molten steel, make weld pool surface scum silica frost and casting roller roll surface keep apart by the slag weir that floats in the molten bath, avoid scum silica frost to be involved in the Cast Strip, improve casting strip quality.
2. raising thin strap continuous casting as claimed in claim 1 Cast Strip method for quality is characterized in that, the width of described slag weir is less than casting roller width, and its end face and side seal board distance are 15-25mm.
3. raising thin strap continuous casting as claimed in claim 1 or 2 Cast Strip method for quality is characterized in that, slag weir tilts to insert in the molten bath, and the degree of depth of the molten steel that submerges behind the slag weir insertion molten bath is greater than level fluctuation amplitude in the casting cycle.
4. as claim 1 or 2 or 3 described raising thin strap continuous casting Cast Strip method for quality, it is characterized in that the described slag weir following 10-15mm of molten steel surface that submerges.
5. as any one described raising thin strap continuous casting Cast Strip method for quality in the claim 1 to 4, it is characterized in that the thickness of described slag weir is preferably 8-15mm.
6. raising thin strap continuous casting as claimed in claim 1 Cast Strip method for quality, it is characterized in that, described confined chamber comprises a top cover and sealing gland cell-type side plate, and the side plate bottom is apart from casting roller roll surface 3-10mm, and its side plate bottom is furnished with uniform pore along casting roll axis direction.
7. raising thin strap continuous casting as claimed in claim 6 Cast Strip method for quality is characterized in that described side plate pore cross section is horn-like, and the distribution distance between the pore equates.
8. as claim 1 or 6 described raising thin strap continuous casting Cast Strip method for quality, it is characterized in that, connect dog screw on the described slag weir, the sheathed guide pin bushing of dog screw one end, guide pin bushing is connected in the fixed mount of confined chamber top cover bottom.
9. raising thin strap continuous casting as claimed in claim 8 Cast Strip method for quality is characterized in that, described dog screw adopts the strong cubic boron nitride material manufacturing of anti-molten steel aggressivity.
10. improve thin strap continuous casting Cast Strip method for quality as claimed in claim 8 or 9, it is characterized in that, described dog screw is a hollow structure, and guide pin bushing adopts the manufacturing of heat-resistance stainless steel material.
11. raising thin strap continuous casting as claimed in claim 1 Cast Strip method for quality is characterized in that, the inert gas in the confined chamber adopts argon gas, makes the concentration of the inner oxygen content of confined chamber less than 2%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010211326 CN102294451B (en) | 2010-06-25 | 2010-06-25 | Method for enhancing strip casting quality |
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|---|---|---|---|
| CN 201010211326 CN102294451B (en) | 2010-06-25 | 2010-06-25 | Method for enhancing strip casting quality |
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| CN102294451A true CN102294451A (en) | 2011-12-28 |
| CN102294451B CN102294451B (en) | 2013-07-17 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105473254A (en) * | 2013-06-04 | 2016-04-06 | 纽科尔公司 | Method of continuously casting thin strip |
| CN106029257A (en) * | 2014-02-24 | 2016-10-12 | 瓦格斯塔夫公司 | Oxide control system for a continuous casting molten metal mold |
| CN106541092A (en) * | 2016-11-25 | 2017-03-29 | 江西理工大学 | A kind of twin-roll thin strip continuous casting side seal board and its using method |
| CN106984780A (en) * | 2015-11-10 | 2017-07-28 | Posco公司 | Double-roll type patented strip continuous caster and use its casting method |
| CN108655356A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of thin strap continuous casting cloth streaming system and its application method |
| CN110087798A (en) * | 2016-12-26 | 2019-08-02 | 普锐特冶金技术日本有限公司 | Encapsulating method, sealing device and the continuous casting apparatus for having the sealing device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105473254A (en) * | 2013-06-04 | 2016-04-06 | 纽科尔公司 | Method of continuously casting thin strip |
| CN106029257A (en) * | 2014-02-24 | 2016-10-12 | 瓦格斯塔夫公司 | Oxide control system for a continuous casting molten metal mold |
| EP3110583A4 (en) * | 2014-02-24 | 2017-10-18 | Wagstaff, Inc. | Oxide control system for a continuous casting molten metal mold |
| CN106029257B (en) * | 2014-02-24 | 2018-10-09 | 瓦格斯塔夫公司 | Oxide control system for continuously or semi-continuously casting molten metal mold |
| CN106984780A (en) * | 2015-11-10 | 2017-07-28 | Posco公司 | Double-roll type patented strip continuous caster and use its casting method |
| CN106541092A (en) * | 2016-11-25 | 2017-03-29 | 江西理工大学 | A kind of twin-roll thin strip continuous casting side seal board and its using method |
| CN110087798A (en) * | 2016-12-26 | 2019-08-02 | 普锐特冶金技术日本有限公司 | Encapsulating method, sealing device and the continuous casting apparatus for having the sealing device |
| CN108655356A (en) * | 2017-03-30 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of thin strap continuous casting cloth streaming system and its application method |
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| CN102294451B (en) | 2013-07-17 |
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