CN101147967A - Straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method - Google Patents
Straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method Download PDFInfo
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Abstract
The present invention discloses a straight-curved type casting machine low-alloy steel slab continuous casting full-rolling section narrow face cooling method, and is aimed at solving the problem of that on the casting blank surface corner portion of low-alloy steel the transverse crack can be easily produced. Said invention belongs to the field of metal continuous casting blank cooling and surface quality control technology. Said method is characterized by that in the full-rolling section of continuous casting straight-curved type casting machine slab said invention utilizes the nozzles which are symmetrically mounted at left side and right side of casting blank pouring direction to cool the narrow face of said casting blank, and adopts rectangular nozzles to symmetrically and simultaneously cool the narrow faces of left and right two sides of casting blank. Said invention also discloses a kind of rectangular nozzle for said method, the water outlet hole of its sprayer is a hole with rectangular section. Said invention can reduce casting blank cooling strength of full-rolling section under the crystallizer and can improve casting blank cooling uniformity, so that it can eliminate casting blank surface corner portion transverse crack defect of continuously-cast high-strength low-alloy steel whose steel quality is P510L, P590L, J55 and X52, etc.
Description
Technical field
The present invention relates to metal strand cooling and surface quality control technology field, especially a kind of metal strand cooling means of eliminating low-alloy steel strand transverse corner crack line defective.
Background technology
At present, it is strong to contain vanadium micro-alloying steel grade crack sensitivity.In continuous casting production process, the V of solid solution is at austenite grain boundary with V (CN) form when temperature reduces and dynamically separates out or static state is separated out under the Yin Gaowen, has increased crack sensitivity.Especially for the straight arc casting machine slab caster, strand is at bending area, strand inner arc side and outer arc side are subjected to compression and tensile stress respectively, and in the aligning zone, strand inner arc side and outer arc side are subjected to tensile stress and compression respectively, strand is concentrated because of the notch effect generation stress of oscillation mark under the tensile stress effect, quickens the formation and the expansion of crackle.Therefore, when adopting the straight arc casting machine slab caster to produce vanadium-containing low steel, if strand leptoprosopy cooling uniformity is poor, the strand bight very easily produces transverse corner crack.Because the transverse corner crack that produces on the strand can't be cleared up aborning, after the strand of band defective was rolling, hot rolled plate crimping portion can produce surface crack defect again.It is 100% that the straight arc slab caster that certain steel mill was constructed and put into operation in 2003 waters low-alloy steel strand transverse corner crack line ratio of defects, causes the carbon aluminium-killed steel that casting machine can only production intensity be low, plasticity is good, can not satisfy the production needs that enlarge the continuous casting kind.Therefore, producing qualified strand is the key link that the production high-quality contains Vanadium Microalloyed Plate Steels, and research and development are the core technologies that improves slab quality with containing the continuous casting billet leptoprosopy cooling control method that vanadium steel adapts.
Be published in the 22nd～25 page " minimizing contains the research of niobium, vanadium, titanium micro-alloyedization steel continuous casting steel billet transverse corner crack "---the Wang Xinhua of " iron and steel " magazine (the 33rd the 1st phase of volume) in January, 1998, Wang Wenjun, work such as Liu Xinyu, reported by improving permanent pulling rate rate, liquid level and controlled devoting rate and casting machine automatically the arc precision, and prolong the plasticity characteristics according to the high temperature of steel and adopt rational two cold technologies, make Baosteel contain niobium, vanadium, titanium micro-alloyedization steel continuous casting billet angle transverse fissure incidence and significantly reduce, angle transverse fissure index reduces to 3.0 by 19.2.Be published in " Shoudu Iron and Steel Co science and technology " magazine in April, 2006, promptly 2006 the 2nd phases, the 19th～21 page " containing the generation reason and the corrective measure of vanadium deck of boat plate slab transverse corner crack line "---fiber crops celebrating Shen, Jiang Zhonghang, work such as Xu Li, reported Shoudu Iron and Steel Co by adopting the low overheat casting, the degree of superheat is lower than 25 ℃, keeps pulling rate and mold liquid level stable, reduce by two cold water distribution quantities, reduce intensity of cooling, suitably improve pulling rate, make high-strength deck of boat plate slab transverse corner crack incidence reduce to 0.10% by 11.80%.
In above-mentioned research, all only continuous casting process especially two cold technologies is optimized, does not consider that sufficient roller section cooling uniformity is to reducing the influence of the bending of straight arc casting machine slab, the regional strand stress of aligning and rate of change.Therefore,, only set about, be difficult to eliminate fully continuous casting steel billet transverse corner crack line defective from raising continuous casting pulling rate, improvement two cold heat transfer types to containing Vanadium Microalloyed Plate Steels.In fact, the cooling uniformity of the especially sufficient roller section of strand cooling uniformity strand leptoprosopy has considerable influence to the continuous plate blank surface crack defective.The strand cooling uniformity is meant that in casting process cooling water is along the distribution of casting billet surface intensity of cooling, and in other conditions one regularly, the distribution of intensity of cooling is exactly the distribution of cooling water flow density.For guaranteeing slab quality, the casting billet surface each several part will evenly be cooled off, thereby make the thickness of solidified slab shell in secondary speed of growth suitable substantially.Casting billet surface each several part intensity of cooling is inconsistent else if, will cause thickness of solidified slab shell in secondary inhomogeneous, the mechanical stress that thermal stress that strand produces at process of setting and casting blank bending and aligning process produce will concentrate on base shell thinnest part, thereby quality problems such as strand crackle occur.But control the technology of bight transverse crack defective by the sufficient roller section cooling means of optimizing the straight arc continuous casting steel billet, yet there are no open report.
Summary of the invention
Can not eliminate the deficiency of transverse corner crack line defective fully for the continuous casting billet that overcomes existing straight arc casting machine, technical problem to be solved by this invention provides a kind of straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method, and this method can effectively be eliminated low-alloy steel strand transverse corner crack line generation of defects.
The technical solution adopted for the present invention to solve the technical problems is: the straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method, sufficient roller section at continuous casting straight arc casting machine slab, utilize the symmetrical nozzle that is installed in about strand casting direction, leptoprosopy is cooled off, and adopt rectangular nozzle to give the symmetry cooling simultaneously the leptoprosopy of the strand left and right sides.
The present invention also provides a kind of rectangular nozzle that can be used for the inventive method, connection screw rod, shower nozzle and coupling nut by hollow are formed, connecting screw rod is threaded with coupling nut, coupling nut compresses the end face of the shower nozzle of hollow with the end face that connects screw rod, the apopore of shower nozzle is the hole of rectangular cross section.
The invention has the beneficial effects as follows: considered that strand foot roller section cooling uniformity is to the slab surface crack defect influence, replace original flat burner with rectangular nozzle, when the water spray cooling, nozzle over against the centre intensity of cooling and nozzle around the intensity of cooling basically identical, thereby improved sufficient roller section strand leptoprosopy cooling uniformity, reduced stress and the rate of change of strand in bending and aligning zone.Simultaneously, suitably reduce the strand cooling water inflow, the strand intensity of cooling reduces, and casting blank surface temperature is higher and even, and strand high temperature prolongs plasticity can be good, realized " high temperature bending " technology, helps the blemish that prevents that straight arc casting machine strand bending process from producing.Also promptly: the present invention has reduced the intensity of cooling of stomatopod roller section under the crystallizer, and has improved the uniformity of strand cooling, can obviously improve casting blank surface temperature.Because casting blank surface temperature is high more, the plasticity of prolonging of steel can be good more, and the ability of resistance to deformation is strong more, bending area at straight arc casting machine, be that strand is being become by straight type in the BENDING PROCESS of camber, under the identical condition of other continuous casting process, the suffered bending stress of strand is certain.The present invention is by improving casting blank surface temperature, guarantees that strand has the good plasticity energy that prolongs, and strengthened strand greatly and resisted diastrophic ability, be i.e. strand resistance to deformation and the critical stress value that do not produce defective increases.Critical stress value can be eliminated the transverse corner crack line defective that causes because of casting blank bending stress is excessive greater than the bending stress value, and then improves slab quality.The present invention can not only eliminate P510L, P590L, J55, X52 etc. and contain strand transverse corner crack line defectives such as Vanadium Microalloyed Plate Steels, can also eliminate inner chink of strand and triangular area crack defective; Simultaneously, can reduce continuous casting steel billet cleaning loss, improve recovery rate of iron; In addition, continuous casting steel billet can be implemented hot delivery and hot charging technology, reduces heating furnace fuel consumption and strand oxidization burning loss; Because of the elimination of casting blank defect, also can enlarge the continuous casting kind.
Description of drawings
Fig. 1 is the structural representation of the rectangular nozzle that adopts of the present invention.
Fig. 2 is arrangement of nozzles of the present invention position and arrangement schematic diagram.
Fig. 3 is the schematic diagram of arrangement of nozzles of the present invention position and another line of vision of arrangement.
Fig. 4 is existing flat burner spray shapes schematic diagram.
Fig. 5 is a rectangular nozzle spray shapes schematic diagram of the present invention.
Be labeled as among the figure, 1 for connecting screw rod, and 2 is shower nozzle, and 3 is coupling nut, and 4 is apopore, and 5 is strand, and 6 is rectangular nozzle, and θ is a jet angle, and the arrow indication is the casting direction.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
As Fig. 1, Fig. 2, Fig. 3 and shown in Figure 5, straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method of the present invention, sufficient roller section at continuous casting straight arc casting machine slab, utilize the symmetrical nozzle that is installed in about strand casting direction, leptoprosopy is cooled off, and adopt the leptoprosopy of 6 pairs of strand 5 left and right sides of rectangular nozzle to give the symmetry cooling simultaneously.
Described rectangular nozzle 6, the apopore that is meant nozzle is a rectangular cross section, spray shapes is approximate rectangular nozzle, as shown in Figure 5.
Described flat burner, the apopore that is meant nozzle is an elliptic jet, spray shapes is olivary nozzle, as shown in Figure 4.
Described symmetry cooling is meant that identical nozzle is arranged symmetrically in the strand casting direction left and right sides, and the jet angle of each nozzle equates with jet length, the water yield of unit interval is identical.
Stock size according to strand and roll, the layout design of rectangular nozzle 6 is: totally eight of the nozzle quantities of strand about 5, promptly four nozzles are respectively arranged on left side and right side longitudinally along strand cast direction, a four one-sided nozzles longitudinally word are equidistantly arranged: as shown in Figure 2, see vertically promptly that along strand cast direction the nozzle quantity on strand left side and right side is four; As shown in Figure 3, see laterally promptly that the nozzle quantity on left side and right side is one along the strand width.
For further improving the uniformity of intensity of cooling, the injection central point of each nozzle is arranged on the center line of strand 5 leptoprosopy.
According to correlative study and experiment, the pass of strand 5 leptoprosopy cooling water inflow W and pulling rate Vc is W=36.5Vc+16 under the work pulling rate of 0.8～1.4m/min, the L/min of unit of cooling water inflow W, the m/min of unit of pulling rate Vc, the cooling water inflow on strand 5 leptoprosopy left side and right side respectively is 0.5W.Adopt such technological parameter, can eliminate the strand crack defect substantially.
According to correlative study and experiment, the atomizing angle θ of rectangular nozzle 6 is preferably 115 °～125 °, and nozzle is preferably 75～85mm apart from the distance of casting billet surface, and the distance between one-sided two adjacent (operating) water nozzles is preferably 165～195mm; The water yield of single-nozzle is preferably 6.5～15.9L/min when hydraulic pressure is 0.1～0.6MPa.
As shown in Figure 1, the present invention has also designed a kind of rectangular nozzle 6 that can be used for the inventive method, connection screw rod 1 by hollow is threaded with coupling nut 3, and coupling nut 3 compresses the end face of the shower nozzle 2 of hollow with the end face that connects screw rod 1, and the apopore 4 of shower nozzle 2 is the hole of rectangular cross section.
Further be that the water inlet end sectional area of apopore 4 is conveniently regulated the intensity of cooling of spraying less than the water side sectional area under the hydraulic pressure change conditions.
Embodiment 1:
Certain pneumatic steelmaking factory adopts the technology of the present invention to control P510L automobile beam slab steel strand transverse corner crack line defective.The chemical constituent of P510L steel except that Fe and small amount of impurities sees Table 1.When continuous casting is produced, adopt nozzle arrangements shown in Figure 1, be made up of shower nozzle 2, connection screw rod 1 and 3 three parts of coupling nut, and press the nozzle exit pressure one discharge characteristic design nozzle shown in the table 2, the foot roller segment narrow surface nozzle is longitudinally seen Fig. 2 and Fig. 3 with horizontal layout schematic diagram.The strand width is set at 1050mm before watering opening, slab thickness is set at 200mm, and the casting machine pulling rate was 1.40m/min when continuous casting was produced, and the foot roller segment narrow surface water yield is set at 67.1L/min.After casting finishes, the strand of producing is carried out inspection of stand, surface and macroscopic examination, check shows strand depth of chatter mark≤0.5mm, casting billet surface and subcutaneous no bight transverse crack, triangular area crack defective.
The chemical constituent of table 1:P510L steel except that Fe and small amount of impurities
| C | Si | Mn | P | S | V | Als |
| 0.07～ 0.12 | 0.15～ 0.30 | 1.05～ 1.25 | 0.010～ 0.024 | 0.005～ 0.014 | 0.06～ 0.10 | 0.019～ 0.048 |
Table 2: the cooling capacity of single rectangular nozzle during different hydraulic pressure
| Hydraulic pressure (Mpa) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 |
| Discharge (L/min) | 6.5 | 9.2 | 11.2 | 13.0 | 14.5 | 15.9 | 17.2 |
Embodiment 2:
Certain pneumatic steelmaking factory adopts the technology of the present invention to control P510L automobile beam slab steel strand transverse corner crack line defective.The chemical constituent of P510L steel except that Fe and small amount of impurities sees Table 1.When continuous casting is produced, adopt nozzle with embodiment 1, the foot roller segment narrow surface nozzle is longitudinally seen Fig. 2 and Fig. 3 with horizontal layout schematic diagram.The strand width is set at 1300mm before watering opening, slab thickness is set at 200mm, and the casting machine pulling rate was 0.80m/min when continuous casting was produced, and the foot roller segment narrow surface water yield is set at 45.2L/min.After casting finishes, the strand of producing is carried out inspection of stand, surface and macroscopic examination, check shows strand depth of chatter mark≤0.8mm, casting billet surface and subcutaneous no bight transverse crack, triangular area crack defective.
Embodiment 3:
Certain pneumatic steelmaking factory adopts the technology of the present invention to control P590L automobile beam slab steel strand transverse corner crack line defective.The chemical constituent of P590L steel except that Fe and small amount of impurities sees Table 3.When continuous casting is produced, adopt nozzle with embodiment 1, the foot roller segment narrow surface nozzle is longitudinally seen Fig. 2 and Fig. 3 with horizontal layout schematic diagram.The strand width is set at 1100mm before watering opening, slab thickness is set at 200mm, and the casting machine pulling rate was 1.20m/min when continuous casting was produced, and the foot roller segment narrow surface water yield is set at 59.8L/min.After casting finishes, the strand of producing is carried out inspection of stand, surface and macroscopic examination, check shows strand depth of chatter mark≤0.7mm, casting billet surface and subcutaneous no bight transverse crack, triangular area crack defective.
The chemical constituent of table 3:P590L steel except that Fe and small amount of impurities
| C | Si | Mn | P | S | V | Als | Nb |
| 0.05～ 0.10 | 0.15～ 0.35 | 1.40～ 1.60 | 0.010～ 0.024 | 0.003～ 0.010 | 0.06～ 0.10 | 0.02～ 0.05 | 0.03～ 0.05 |
Embodiment 4:
Certain pneumatic steelmaking factory adopts the technology of the present invention to control J55 oil casing pipe steel strand transverse corner crack line defective.The chemical constituent of J55 steel except that Fe and small amount of impurities sees Table 4.When continuous casting is produced, adopt nozzle with embodiment 1, the foot roller segment narrow surface nozzle is longitudinally seen Fig. 2 and Fig. 3 with horizontal layout schematic diagram.The strand width is set at 1200mm before watering opening, slab thickness is set at 200mm, and the casting machine pulling rate was 1.10m/min when continuous casting was produced, and the foot roller segment narrow surface water yield is set at 56.2L/min.After casting finishes, the strand of producing is carried out inspection of stand, surface and macroscopic examination, check shows strand depth of chatter mark≤0.7mm, casting billet surface and subcutaneous no bight transverse crack, triangular area crack defective.
The chemical constituent of table 4:J55 steel except that Fe and small amount of impurities
| C | Si | Mn | P | S | V | Als | Ti |
| 0.08～ 0.13 | 0.20～ 0.40 | 1.30～ 1.55 | 0.010～ 0.020 | 0.005～ 0.013 | 0.06～ 0.12 | 0.02～ 0.05 | 0.01～ 0.03 |
Embodiment 5:
Certain pneumatic steelmaking factory adopts the technology of the present invention to control X52 oil casing pipe steel strand transverse corner crack line defective.The chemical constituent of X52 steel except that Fe and small amount of impurities sees Table 5.When continuous casting is produced, adopt nozzle with embodiment 1, the foot roller segment narrow surface nozzle is longitudinally seen Fig. 2 and Fig. 3 with horizontal layout schematic diagram.The strand width is set at 1250mm before watering opening, slab thickness is set at 200mm, and the casting machine pulling rate was 1.00m/min when continuous casting was produced, and the foot roller segment narrow surface water yield is set at 52.5L/min.After casting finishes, the strand of producing is carried out inspection of stand, surface and macroscopic examination, check shows strand depth of chatter mark≤0.8mm, casting billet surface and subcutaneous no bight transverse crack, triangular area crack defective.
The chemical constituent of table 5:X52 steel except that Fe and small amount of impurities
| C | Si | Mn | P | S | V | Als | Nb |
| 0.05～ 0.10 | 0.15～ 0.35 | 0.90～ 1.40 | 0.010～ 0.020 | 0.003～ 0.010 | 0.02～ 0.05 | 0.02～ 0.06 | 0.01～ 0.05 |
Claims (7)
1. straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method, sufficient roller section at continuous casting straight arc casting machine slab, utilize the symmetrical nozzle that is installed in about strand casting direction, leptoprosopy is cooled off, it is characterized in that: adopt rectangular nozzle (6) to give the symmetry cooling simultaneously the leptoprosopy of strand (5) left and right sides.
2. straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method as claimed in claim 1, it is characterized in that: totally eight of the nozzle quantities about described strand (5), along strand cast direction promptly longitudinally left side and right side respectively arrange four nozzles, four an one-sided nozzles longitudinally word are equidistantly arranged.
3. straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method as claimed in claim 1 is characterized in that: the injection central point of each nozzle is arranged on the center line of strand (5) leptoprosopy.
4. straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method as claimed in claim 1, it is characterized in that: the pass of strand (5) leptoprosopy cooling water inflow W and pulling rate Vc is W=36.5Vc+16 under the work pulling rate of 0.8～1.4m/min, the L/min of unit of cooling water inflow W, the m/min of unit of pulling rate Vc, the cooling water inflow on strand (5) leptoprosopy left side and right side respectively is 0.5W.
5. as claim 1,2,3 or 4 described straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling methods, it is characterized in that: nozzle atomization angle θ is 115 °～125 °, nozzle is 75～85mm apart from the distance of casting billet surface, and the distance between one-sided two adjacent (operating) water nozzles is 165～195mm; The water yield of single-nozzle is 6.5～15.9L/min when hydraulic pressure is 0.1～0.6MPa.
6. the rectangular nozzle (6) that is used for the described straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method of claim 1, connection screw rod (1), shower nozzle (2) and coupling nut (3) by hollow are formed, connecting screw rod (1) is threaded with coupling nut (3), coupling nut (3) compresses the end face of the shower nozzle (2) of hollow with the end face that connects screw rod (1), it is characterized in that: the apopore (4) of shower nozzle (2) is the hole of rectangular cross section.
7. rectangular nozzle as claimed in claim 6 (6) is characterized in that: the water inlet end sectional area of apopore (4) is less than the water side sectional area.
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