CN106583453B - A kind of method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar - Google Patents

A kind of method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar Download PDF

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CN106583453B
CN106583453B CN201611230389.4A CN201611230389A CN106583453B CN 106583453 B CN106583453 B CN 106583453B CN 201611230389 A CN201611230389 A CN 201611230389A CN 106583453 B CN106583453 B CN 106583453B
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temperature
rolling
roughing
continuous casting
thickness
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CN106583453A (en
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陈全忠
陈连龙
吴有生
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

The present invention relates to a kind of method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, by molten steel direct casting into the continuous casting billet that width is 1300~1600mm, thickness is 60~100mm, then roughing, insulation cover insulation, sensing heating, high-pressure water descaling and finish rolling are carried out successively and obtains the ultrathin strip that width is 1300~1600mm, thickness is 0.8~1mm, are most sheared and are batched coiled through control cooling, bundling afterwards.The yield strength of obtained ultra-thin mild steel finished product is 250~310MPa, and tensile strength is 350~400MPa, elongation percentage >=35%.The method of the present invention can realize the steady production of 0.8~1mm thickness hot ultrathin mild steel, and improve dimensional accuracy, plate shape precision and comprehensive mechanical property, and realizing " with hot Dai Leng " demands, reduces production cost.

Description

A kind of method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar
Technical field
The present invention relates to hot rolling technique field, is produced more specifically to one kind using continuous casting and rolling technique of sheet bar The method of ultra-thin mild steel.
Background technology
The technology path of the continuous casting and rolling technique of sheet bar of recent development is both at home and abroad：Continuous casting-roughing-shearing-insulation-sense Should heat-de-scaling-finish rolling-control cooling-shears-batches.Compared with traditional continuous casting and rolling technique of sheet bar, which can The thinner hot-strip of thickness is produced, product can be realized " with hot Dai Leng ", so as to reduce energy consumption and production to a greater degree Cost, therefore have a vast market prospect.
0.8~1mm can reach using the mild steel product thickness of this technique productions at present, the thickness range is low in hot rolling Ultra-thin specification is already belonging in carbon steel, the cold-rolled products of same specification can be substituted, applied to industries such as building, automobile and household electrical appliances, is used In components such as manufacture various building element, container, panel, hood and babinets.But using the technique productions, these are thin Following problem is still run into during specification mild steel：1st, each rack pressure unreasonable distribution causes some rack to reach load pole Limit, makes the operation of rolling unstable；2nd, since strip continuously produces for a long time, making each rack working roll, (especially finishing mill works Roller) abrasion is more serious, causes belt steel thickness precision and plate shape precision to be difficult to control, occur that obvious thickness is overproof and shape wave； 3rd, quickly, belt steel temperature fluctuation is larger, makes target final rolling temperature hit rate relatively low for thin gauge strip temperature drop, to band steel mechanical property Have a negative impact.
The key to solve the above problems is the technique ginseng of the further ultra-thin mild steel of optimization thin slab continuous casting and rolling production Number, is included in continuous casting section and obtains appropriate sheet billet thickness and casting speed；Rational rolling rule are formulated in roughing and finish rolling section Journey (such as each rack reduction distribution, Calculating Rolling Force Energy Parameters and mill speed), the presetting optimal thickness of slab in the operation of rolling And Strip Shape Control parameter, so as to improve strip thickness of slab and plate shape feedback regulation efficiency；Joining section between roughing and finish rolling is formulated Stringent insulation, heating and de-scaling system is to control the belt steel temperature scope of each operation；Formulated in control cooling section rational cold But strategy and cooling velocity are to control strip phase transformation in cooling procedure, and then obtain preferable microstructure etc..
The content of the invention
The technical problem to be solved in the present invention is, there is provided one kind produces ultra-thin low-carbon using continuous casting and rolling technique of sheet bar The method of steel, it is low can stably to produce the hot ultrathin that dimensional accuracy, plate shape precision and comprehensive mechanical property are satisfied by requiring Carbon steel.
The technical solution adopted by the present invention to solve the technical problems is：Construction one kind applies continuous casting and rolling technique of sheet bar The method for producing ultra-thin mild steel, by molten steel direct casting into the continuous casting that width is 1300~1600mm, thickness is 60~100mm Base, then carry out roughing successively, insulation cover insulation, sensing heating, high-pressure water descaling and finish rolling obtain width be 1300~ 1600mm, the ultrathin strip that thickness is 0.8~1mm, most shear through control cooling, bundling and batch coiled afterwards.Main technique walks Rapid and technological parameter is as follows：
(1) continuous casting
The ladle chemistry is by mass percentage：C 0.05%~0.1%, Si 0.01%~0.04%, Mn 0.08%~0.2%, Al 0.02%~0.04%, P≤0.015%, S≤0.01%, N≤0.006%, Ca≤0.0012%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.01%, remaining is for Fe and not Evitable trace element.
The casting speed of the continuous casting billet is 5.2~7m/min, and maximum casting speed vmaxWith thickness of strand h's Numerical relation meets：vmax=9.76 × 10-4h2-0.248h+20.25。
(2) roughing
The roughing mills are 3 rack roughing mills, and total reduction is 85%~90%, and roughing exit thickness is 9~11mm, Roughing initial temperature is 1140~1160 DEG C, and roughing finishing temperature is 1010~1030 DEG C, unit width draught pressure for 14~ 17KN/mm。
(3) insulation cover is kept the temperature
The insulation cover length is 11m, and insulation cover interior environment temperature is 500~550 DEG C.
(4) sensing heating
The induction heating apparatus includes 14 heaters, and each heater power is 2600~3000KW.Sensing heating Middle base temperature is set to raise 280~300 DEG C, base temperature is 1170~1190 DEG C among induction heating apparatus outlet.Computer is certainly Autocontrol system sets sensing heater according to the observed temperature of induction heater entrance pyrometer and starts quantity and power, according to The observed temperature of sensing heating outlet of still pyrometer adjusts sensing heater power, realizes base temperature among sensing heating outlet of still Feedback control.
(5) high-pressure water descaling
The high pressure water descaling device includes upper and lower two collectors, and 46 platypelloid type nozzles, nozzle are set on each collector Spacing is 35mm, and collector spraying width is 1720mm, and hydraulic pressure is 37~42MPa, and total water current amount is 170~190m3/ h, de-scaling make Middle base surface temperature drop is 90~110 DEG C.Speed and descaling device inlet of the computer automatic control system according to middle base The observed temperature of middle base adjusts hydraulic pressure and water flow.
(6) finish rolling
The mm finishing mill unit is 5 rack finishing mills, and total reduction is 88%~93%, finish rolling exit thickness for 0.8~ 1mm, finish rolling initial temperature are 1010~1030 DEG C, and finish rolling finishing temperature is 830~850 DEG C, unit width draught pressure for 8~ 20KN/mm。
(7) control cooling
The Controlled cooling process is then air-cooled first to carry out section cooling to strip.Specially：
The control cooling section includes 35 upper headers and 105 lower collector pipes, under the sprinkling zone of each upper header and 3 The sprinkling zone of collector corresponds to.The flow of each upper header is 120~150m3/ h, the flow of each lower collector pipe is 40~50m3/ H, upper header spacing are 1110mm, and next part tube spacing is 370mm.
Computer automatic control system according to control cooling section strip steel at entry temperature, speed and thickness setting upper header and under The unlatching quantity of collector, and the water flow of upper header and lower collector pipe is carried out presetting, realize air-cooled after strip elder generation section cooling Cooling technique.The upper header being had turned on according to the deviation feedback regulation of belt steel temperature measured value and target coiling temperature before batching With the water flow of lower collector pipe.
It is described that to control cooling section strip steel at entry temperature be 810~840 DEG C, at the end of section cooling belt steel temperature for 600~ 630 DEG C, hydraulic pressure is 0.07~0.09MPa, and section cooling speed is 400~600 DEG C/s.The air cooling time is 3~5s.
(8) bundling is sheared and batched
The bundling shearing uses rotary hub type flying shear, and the coiling machine is underground type coiling machine.Unit width volume weighs 20~ 22kg/mm, coiling temperature are 530~550 DEG C.
Longitudinal thickness deviation≤120 μm of the middle base, it is wide to convexity deviation C40≤60μm.The finished strip is indulged It is wide to convexity deviation C to thickness deviation≤40 μm, plate shape deviation≤35I40≤20μm.The surrender of the ultra-thin mild steel finished product Intensity is 250~310MPa, and tensile strength is 350~400MPa, elongation percentage >=35%.
By such scheme, the thickness of strand is 75~85mm, and casting speed is 5.8~6.2m/min.
By such scheme, the first roughing mill reduction ratio of the roughing mills is 48%~52%, and rolling temperature control exists 1140~1160 DEG C, unit width draught pressure is 14.1~16KN/mm；Second roughing mill reduction ratio is 50%~55%, is rolled For temperature control processed at 1075~1095 DEG C, unit width draught pressure is 15~16.5KN/mm；3rd roughing mill reduction ratio is 45%~50%, rolling temperature is controlled at 1010~1030 DEG C, and unit width draught pressure is 15.5~16.7KN/mm.
By such scheme, the first finishing mill reduction ratio of the mm finishing mill unit is 58%~62%, and rolling temperature control exists 1010~1030 DEG C, unit width draught pressure is 17~19KN/mm；Second finishing mill reduction ratio is 45%~50%, rolling For temperature control at 960~980 DEG C, unit width draught pressure is 19~20KN/mm；3rd finishing mill reduction ratio for 37%~ 43%, rolling temperature is controlled at 925~945 DEG C, and unit width draught pressure is 16.5~18KN/mm；4th finishing mill is depressed Rate is 25%~30%, and rolling temperature is controlled at 880~900 DEG C, and unit width draught pressure is 14~15.2KN/mm；5th Finishing mill reduction ratio is 10%~15%, and rolling temperature is controlled at 830~850 DEG C, and unit width draught pressure is 8~8.7KN/ mm。
By such scheme, hydraulic AGC technology is used in roughing and mm finishing mill unit.Specially：Before rolling Roller gap preset is carried out, exporting calibrator according to the 3rd roughing mill in the operation of rolling surveys thickness to middle base thickness feedback control System, surveys thickness according to the 5th finishing mill outlet calibrator and finished strip thickness feedback is controlled.Passed according to main hydraulic cylinder pressure Sensor measured value carries out roll-force overload protection.
By such scheme, the positive and negative roller technology of working roll is used in roughing mills, working roll is used in mm finishing mill unit Positive roller and working roll roll shifting technology.Specially：It on every side shaft holder is 900~1200KN that the positive bending roller force of roughing mill, which is, is born curved It on every side shaft holder is -1300~-1700KN (negative sign expression direction) that roller power, which is, and first, second finishing mill of mm finishing mill unit is just It is 1500~1700KN on every side shaft holder that bending roller force, which is, and working roll roll shifting scope is 100~120mm, the three, the 4th and the 5th It is 850~1000KN on every side shaft holder that the positive bending roller force of finishing mill, which is, and working roll roll shifting scope is -180~-200mm (negative signs Represent direction).
By such scheme, working roll dynamic cooling technology is used in roughing and mm finishing mill unit.Specially：Working roll moves State cooling includes main cooling, middle part supplement heat rejecter and edge supplement heat rejecter.It is 0.8~1MPa to cool down water injection pressure, each thick The total cooling water inflow of mill stand is 1000~1200m3/ h, each total cooling water inflow of finishing stand are 900~1000m3/h.By pre- Setting and the total cooling water inflow and ratio for adjusting three kinds of refrigerating modes, to adjust each rack work roll thermal roll shape, and then are adjusted Section has the purpose for carrying Gap crown.
By such scheme, dynamic variable specification technology is used in mm finishing mill unit.Specially：1.5mm thickness finished products are used first The finish rolling rolling procedure of strip carries out threading and rolling, after the coil of strip for producing a 1.5mm thickness, using the dynamic of mm finishing mill unit Become pressure and the mill speed of each finishing stand of specification function point analysis, finished strip thickness is changed into 1.2mm from 1.5mm, produce After going out the coil of strip of a 1.2mm thickness, then 1mm is changed to by 1.2mm and is stably produced, if desired produce thinner finished strip, then Continue to adjust pressure and the mill speed of each finishing stand, the production then stablized.The maximum that period dynamically adjusts every time Adjustment amount is 0.2mm, and finished strip is most thin can be adjusted to 0.8mm.Then by thin thickening during whipping, by above-mentioned opposite mode into OK.
By such scheme, roll gap lubrication technology is used in mm finishing mill unit.Specially：Each rack is used for roll gap lubrication Concentration of lubricating oil is 0.2%~0.4%, and injection flow is 5800~6300L/min, and injection pressure is 0.15~0.35MPa.
By such scheme, for section cooling positioned at control cooling section inlet, it is 3 that laminar flow cooling upper header, which opens quantity, The unlatching quantity of lower collector pipe is 12.The water flow set point of each upper header is 120~135m3/ h, the water of each lower collector pipe Flow setting value is 40~45m3/ h, section cooling hydraulic pressure are 0.08MPa.
Implement the method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar of the present invention, have below beneficial to effect Fruit：
(1) under conditions of guarantee continuous casting billet not bleedout, the thickness and pulling rate of continuous casting billet are improved, so passing through increases rolling Compression ratio can eliminate the internal flaw of continuous casting billet, such as loose, crackle and segregation as far as possible, reach the mesh for improving product mechanical property , additionally it is possible to rolled with higher speed, reduce rolled piece temperature drop, required finish rolling is obtained with less energy medium consumption Finishing temperature and strip heterogeneous microstructure.
(2) by strictly controlling rolled piece temperature range at each operation, to meet final rolling temperature requirement, finish rolling finish to gauge temperature is improved Spend targeting rate.By optimizing the rolling procedure (rolling temperature, reduction ratio and draught pressure) of roughing and each rack of finish rolling, subtract Few production accident rate.
(3) efficient strip thickness of slab and Strip Shape Control technology are used in roughing and finishing stands, it is presetting optimal Technological parameter, and feedback regulation is carried out to thickness of slab and plate shape to improve the control effect of thickness of slab and plate shape.
(4) yield strength of ultra-thin mild steel finished product made from is 250~310MPa, and tensile strength is 350~400MPa, Elongation percentage >=35%.The method of the present invention can realize the steady production of 0.8~1mm thickness hot ultrathin mild steel, and improve size Precision, plate shape precision and comprehensive mechanical property, realizing " with hot Dai Leng " demands, reduces production cost.
Brief description of the drawings
Below in conjunction with accompanying drawings and embodiments, the invention will be further described, in attached drawing：
Fig. 1 is the process route that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar of the embodiment of the present invention one Figure；
Fig. 2 is continuous casting billet maximum pulling rate-thickness map under the conditions of avoiding bleedout of the embodiment of the present invention one；
Fig. 3 is the iron-carbon diagram that the phosphorus content of the embodiment of the present invention one is 0.05%~0.1% mild steel；
Fig. 4 is the control cooling section arrangement schematic diagram of the embodiment of the present invention one and embodiment three；
Fig. 5 is that the mild steel of the embodiment of the present invention one controls cooling section phase transformation schematic diagram.
Embodiment
In order to which the technical features, objects and effects of the present invention are more clearly understood, now compare attached drawing and describe in detail The embodiment of the present invention.
Embodiment one：
A kind of method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar provided in this embodiment, its technique road Line as shown in Figure 1, molten steel direct casting first into the continuous casting billet that width is 1300~1600mm, thickness is 60~100mm, then Roughing, insulation cover insulation, sensing heating, high-pressure water descaling and finish rolling are carried out successively obtains width as 1300~1600mm, thickness For the ultrathin strip of 0.8~1mm, most shear and batch coiled through control cooling, bundling afterwards.Main technological steps and technological parameter It is as follows：
(1) continuous casting
The ladle chemistry is by mass percentage：C 0.05%~0.1%, Si 0.01%~0.04%, Mn 0.08%~0.2%, Al 0.02%~0.04%, P≤0.015%, S≤0.01%, N≤0.006%, Ca≤0.0012%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.01%, remaining is for Fe and not Evitable trace element.
The casting speed of the continuous casting billet is 5.2~7m/min, and maximum casting speed vmaxWith thickness of strand h's Numerical relation meets：vmax=9.76 × 10-4h2-0.248h+20.25。
The numerical relation of continuous casting billet maximum casting speed and thickness is established to avoid continuous casting billet bleedout for principle, meets to roll The continuous casting billet minimum thickness of compression ratio requirement processed is 60mm, and the minimum pulling rate of finishing temperature needed for satisfaction is 5.2m/min, is met The maximum pulling rate of design for continuous casting machine ability is 7m/min, by minimum pulling rate and avoids continuous casting billet maximum pulling rate-thickness of bleedout bent The continuous casting billet maximum gauge that line determines is 100mm.As shown in Fig. 2, the coordinate points of thickness of strand and casting speed composition need to fall In fig. 2 in ABCD regional extents, continuous casting billet within that range has the advantages that 3：1st, can directly be rolled without Continuous casting billet bleedout accident occurs；2nd, it can ensure enough rolling reductions, to eliminate the internal flaw of continuous casting billet, such as dredge Pine, crackle and segregation etc., so as to improve product mechanical property；3rd, it can be rolled with higher speed, reduce rolled piece temperature drop And energy consumption, obtain required finish rolling finishing temperature and strip heterogeneous microstructure.
(2) roughing
The roughing mills are 3 rack roughing mills, and total reduction is 85%~90%, and roughing exit thickness is 9~11mm, Roughing exit thickness is 9~11mm, and roughing initial temperature is 1140~1160 DEG C, and roughing finishing temperature is 1010~1030 DEG C, Unit width draught pressure is 14~17KN/mm.
According to the carbon iron balance phasor shown in Fig. 3, for the mild steel that phosphorus content is 0.05%~0.1%, roughing When initial temperature is 1140~1160 DEG C, the middle temperature province of mild steel austenitic area is located substantially at, at this time in continuous casting billet Portion is high temperature austenite tissue, coarse grains, and carbide is dissolved completely in austenite structure, is very suitable for the big pressure of roughing Lower amount rolling.After 3 rack roughing mills, due to rolled piece heat radiation temperature drop, rolled piece and working roll contact heat conductien temperature drop and The comprehensive function of rolled piece temperature rise caused by rolling plastic deformation heat and frictional heat so that roughing finishing temperature still may remain in 1010~1030 DEG C, which is located substantially at ferrite and starts more than transformation line 100~160 DEG C, due in rough rolling process The effect of dynamic recrystallization, makes the middle base inside austenite grain that roughing obtains become tiny isometric.
Due to high in roughing section rolled piece mean temperature, and the thick Temperature Distribution upwards of slab is (firm for " reverse temperature curve " Firm cured slab central temperature is 100~150 DEG C higher than surface temperature), resistance of deformation very little, deformation is concentrated mainly in slab Portion, therefore roughing mill can carry out heavy reduction rolling with relatively low energy consumption.Calculated by hot-rolling draught pressure energy parameter model Unit width draught pressure is 14~17KN/mm, and contact stress is 1366~1505MPa between corresponding roller, less than roll for hot-rolling Contact stress 1800MPa between maximum allowable roller, can make it that the roll wear of rolling unit length rolled piece is small, can also avoid because Contact stress and thermal stress are superimposed caused spalling of rolls between roller, therefore can improve work roll cooling cycle and rolling tonnage.
Roughing section total reduction is 85%~90%, is existed equivalent to 88%~90% from continuous casting billet to finished product overall reduction Roughing section is completed, and finish rolling section only completes the 10%~12% of overall reduction, can reduce the high load capacity to follow-up mm finishing mill unit It is required that being conducive to mm finishing mill unit is absorbed in control to belt steel thickness precision, plate shape precision and surface quality.In addition, thickness is 9 The middle base accumulation of heat effect of~11mm is preferable, and temperature drop and head and tail temperature difference of the middle base on delay table can be ensured all without too Greatly, the concurrent heating burden of follow-up induction heater is reduced, to reduce energy consumption.
(3) insulation cover is kept the temperature
The insulation cover length is 11m, and insulation cover interior environment temperature is 500~550 DEG C, can effectively reduce middle base and exist Temperature drop on delay table, reduces the concurrent heating burden of follow-up sensing heating.
(4) sensing heating
The induction heating apparatus includes 14 heaters, and each heater power is 2600~3000KW.Sensing heating Middle base temperature is set to raise 280~300 DEG C, base temperature is 1170~1190 DEG C among induction heating apparatus outlet.Computer is certainly Autocontrol system sets sensing heater according to the observed temperature of induction heater entrance pyrometer and starts quantity and power, according to The observed temperature of sensing heating outlet of still pyrometer adjusts sensing heater power, it can be achieved that sensing heating outlet of still centre base temperature The feedback control of degree.
(5) high-pressure water descaling
The high pressure water descaling device includes upper and lower two collectors, and 46 platypelloid type nozzles, nozzle are set on each collector Spacing is 35mm, and collector spraying width is 1720mm, and hydraulic pressure is 37~42MPa, and total water current amount is 170~190m3/ h, de-scaling make Middle base surface temperature drop is 90~110 DEG C.Speed and descaling device inlet of the computer automatic control system according to middle base The observed temperature of middle base adjusts hydraulic pressure and water flow, guarantee and can effectively remove middle base scale on surface, prevent finish rolling When surface scale press-in strip, and temperature drop of the middle base during de-scaling can be made smaller, maintain higher finish rolling section entrance Belt steel temperature.
(6) finish rolling
The mm finishing mill unit is 5 rack finishing mills, and total reduction is 88%~93%, finish rolling exit thickness for 0.8~ 1mm, finish rolling initial temperature are 1010~1030 DEG C, and finish rolling finishing temperature is 830~850 DEG C, unit width draught pressure for 8~ 20KN/mm。
After middle base enters mm finishing mill unit with the finish rolling initial temperature, peeled off since roll is anti-cold between water cooling, rack But the comprehensive function of water cooling, heat radiation, strip and roll contact heat transfer, plastic deformation heat and frictional heat, the total body temperature of strip Drop is maintained at 160~200 DEG C, and required strip finishing temperature can be met after temperature drop, is microcosmic in follow-up laminar cooling process Structural transformation is prepared.In addition, the finish rolling section temperature range can ensure that strip is rolled in austenitic area all the time, finish rolling is avoided Shi Fasheng austenites are changed into ferrite, if otherwise being rolled in austenite and ferrite two-phase section, strip Mechanical Fluctuation It is unstable compared with rolling is made greatly, and banded structure and non-uniform mixed grain structure can be produced, make band steel mechanical property and processability It can deteriorate.
(7) control cooling
The Controlled cooling process is then air-cooled first to carry out section cooling to strip.Specially：
As shown in figure 4, the control cooling section includes 35 upper headers and 105 lower collector pipes, the water spray of each upper header Region is corresponding with the sprinkling zone of 3 lower collector pipes, and the flow of each upper header is 120~150m3/ h, the maximum of each lower collector pipe Flow is 40~50m3/ h, upper header spacing are 1110mm, and next part tube spacing is 370mm.Due to being ejected into strip lower surface Cooling water drips quickly under the effect of gravity, can not the cooling water of image-tape steel upper surface flow like that, therefore be arranged so as to can be with Refine the sprinkling zone of strip lower surface cooling water, strip upper and lower surface is uniformly cooled down, when avoiding the thin gauge strip from cooling down to Upper warpage.
Computer automatic control system according to control cooling section strip steel at entry temperature, speed and thickness setting upper header and under The unlatching quantity of collector, and the water flow of upper header and lower collector pipe is carried out presetting, realize air-cooled after strip elder generation section cooling Cooling technique.The upper header being had turned on according to the deviation feedback regulation of belt steel temperature measured value and target coiling temperature before batching With the water flow of lower collector pipe, to adjust laminar flow cooling velocity, actual coiling temperature is set accurately to hit target coiling temperature.
It is described that to control cooling section strip steel at entry temperature be 810~840 DEG C, at the end of section cooling belt steel temperature for 600~ 630 DEG C, hydraulic pressure is 0.07~0.09MPa, and section cooling speed is 400~600 DEG C/s.The air cooling time is 3~5s.
As shown in figure 5, section cooling makes strip be cooled fast to ferrite transformation temperature section, the part when then air-cooled Cooling Austenite Transformation is ferrite, and as belt steel temperature further reduces, remaining Cooling Austenite Transformation is pearlite.Most The line and staff control of ferrite and pearlite is obtained eventually.
(8) bundling is sheared and batched
The bundling shearing uses rotary hub type flying shear, and the coiling machine is underground type coiling machine.Unit width volume weighs 20~ 22kg/mm, coiling temperature are 530~550 DEG C, are batched within this temperature range, after can both causing to avoid coiling temperature is excessive Band crystalline grain of steel is grown up during continuous slow cooling, while can also separate out tiny, Dispersed precipitate carbide, improves the comprehensive of ultra-thin mild steel finished product Close mechanical property.
Embodiment two：
The present embodiment provided on the basis of embodiment one it is a kind of in further detail, optimization process program, finished product can be made Strip longitudinal thickness precision, plate shape precision and surface quality are more preferable, and obtain the synthesis mechanics suitable with same specification cold-strip steel Performance.
The thickness of strand is 75~85mm, and casting speed is 5.8~6.2m/min.
First roughing mill reduction ratio of the roughing mills is 48%~52%, and rolling temperature is controlled 1140~1160 DEG C, unit width draught pressure is 14.1~16KN/mm；Second roughing mill reduction ratio is 50%~55%, rolling temperature control At 1075~1095 DEG C, unit width draught pressure is 15~16.5KN/mm；3rd roughing mill reduction ratio is 45%~50%, Rolling temperature is controlled at 1010~1030 DEG C, and unit width draught pressure is 15.5~16.7KN/mm.
First finishing mill reduction ratio of the mm finishing mill unit is 58%~62%, and rolling temperature is controlled 1010~1030 DEG C, unit width draught pressure is 17~19KN/mm；Second finishing mill reduction ratio is 45%~50%, and rolling temperature control exists 960~980 DEG C, unit width draught pressure is 19~20KN/mm；3rd finishing mill reduction ratio is 37%~43%, rolling temperature At 925~945 DEG C, unit width draught pressure is 16.5~18KN/mm for degree control；4th finishing mill reduction ratio for 25%~ 30%, rolling temperature is controlled at 880~900 DEG C, and unit width draught pressure is 14~15.2KN/mm；5th finishing mill is depressed Rate is 10%~15%, and rolling temperature is controlled at 830~850 DEG C, and unit width draught pressure is 8~8.7KN/mm.
Permanent gap preset carries out each rack using hydraulic AGC technology in roughing and mm finishing mill unit, with The thickness fluctuation of continuous casting billet and middle base is effectively eliminated, improves middle base and finished strip longitudinal thickness precision.Specially：Rolling Preceding carry out roller gap preset, exports calibrator according to the 3rd roughing mill in the operation of rolling and surveys thickness to middle base thickness feedback control System, surveys thickness according to the 5th finishing mill outlet calibrator and finished strip thickness feedback is controlled.Passed according to main hydraulic cylinder pressure Sensor measured value carries out roll-force overload protection.
Using base convexity among the positive and negative roller technical controlling of working roll in roughing mills, work is used in mm finishing mill unit Make the positive roller of roller and working roll roll shifting technical controlling completed belt steel plate shape.Specially：The positive bending roller force of roughing mill is per side shaft holder Upper is 900~1200KN, and it is -1300~-1700KN (negative sign expression direction) on every side shaft holder that negative bending roller force, which is, mm finishing mill unit It is 1500~1700KN on every side shaft holder that the positive bending roller force of first, second finishing mill, which is, working roll roll shifting scope for 100~ It on every side shaft holder is 850~1000KN that the positive bending roller force of the finishing mills of 120mm, the three, the 4th and the 5th, which is, working roll roll shifting model Enclose for -180~-200mm (negative sign expression direction).
Using base convexity and completed belt steel plate among working roll dynamic cooling technical controlling in roughing and mm finishing mill unit Shape.Specially：Working roll dynamic cooling includes main cooling, middle part supplement heat rejecter and edge supplement heat rejecter.Wherein, main cooling is realized The constant cooldown rate of the working roll body of roll, middle part supplement heat rejecter are used for bent to obtain convex roll gap to carrying out additional cooling in the middle part of the body of roll Line, edge supplement heat rejecter are used to carry out roll body side portion additional cooling to obtain recessed roll gap curve.It is 0.8 to cool down water injection pressure ~1MPa, each total cooling water inflow of pony roughing mill are 1000~1200m3/ h, each total cooling water inflow of finishing stand for 900~ 1000m3/h.By presetting and three kinds of refrigerating modes of adjusting total cooling water inflow and ratio, to adjust each rack work roll thermal Roll shape, and then adjust the purpose for having and carrying Gap crown.
" boiling hot roller " is carried out using dynamic variable specification technology in mm finishing mill unit, can rapidly be obtained needed for rolling ultrathin strip Stabilization work roll thermal roll shape and complete fine and close work roll surface oxide-film.Specially：1.5mm thickness completed belt is used first The finish rolling rolling procedure of steel carries out threading and rolling, after the coil of strip for producing 1.5mm thickness, using the dynamic change of mm finishing mill unit The pressure of each finishing stand of specification function point analysis and mill speed, change to 1.2mm from 1.5mm by finished strip thickness, produce After the coil of strip of one 1.2mm thickness, then 1mm is changed to by 1.2mm and is stably produced, if desired produce thinner finished strip, then after The continuous pressure for adjusting each finishing stand and mill speed, the production then stablized.The maximum tune that period dynamically adjusts every time Whole amount is 0.2mm, and finished strip is most thin can be adjusted to 0.8mm.Then by thin thickening during whipping, by above-mentioned opposite mode into OK.
The friction coefficient between working roll and strip is reduced using roll gap lubrication technology in mm finishing mill unit, to reduce rolling energy Consumption and working roller abrasion, improve strip surface quality and working roll service life.Specially：Each rack is used for roll gap lubrication Concentration of lubricating oil is 0.2%~0.4%, and injection flow is 5800~6300L/min, and injection pressure is 0.15~0.35MPa.
As shown in figure 4, section cooling, positioned at control cooling section inlet, it is 3 that laminar flow cooling upper header, which opens quantity, under The unlatching quantity of collector is 12.The water flow set point of each upper header is 120~135m3/ h, the current of each lower collector pipe Amount setting value is 40~45m3/ h, section cooling hydraulic pressure are 0.08MPa.
Longitudinal thickness deviation≤120 μm of the middle base obtained using the present embodiment method, it is wide to convexity deviation C40≤60μ m.Longitudinal thickness deviation≤40 μm of finished strip, plate shape deviation≤35I are wide to convexity deviation C40≤25μm.Ultra-thin mild steel The Main Mechanical of finished product is all fallen within following scope：Yield strength is 250~310MPa, tensile strength for 350~ 400MPa, elongation percentage >=35%.The cold-strip steel of same specification can be above substituted well in application.
Embodiment three：
The present embodiment by produce phosphorus content 0.06%, width 1600mm, thickness 0.8mm finished strip exemplified by, its is specific Technique is as described below.
Then molten steel direct casting carries out roughing, insulation cover successively into the continuous casting billet that width is 1600mm, thickness is 80mm Insulation, sensing heating, high-pressure water descaling and finish rolling obtain the ultrathin strip that width is 1600mm, thickness is 0.8mm, most afterwards through control Refrigeration but, bundling shear and batch in rolls.Main technological steps and technological parameter are as follows：
(1) continuous casting
The ladle chemistry is by mass percentage：C 0.06%, Si 0.01%~0.04%, Mn 0.08%~ 0.2%th, Al 0.02%~0.04%, P≤0.015%, S≤0.01%, N≤0.006%, Ca≤0.0012%, Cu≤ 0.15%th, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.01%, remaining is Fe and can not keep away The trace element exempted from.
The casting speed of the continuous casting billet is 6m/min.
(2) roughing
The roughing mills are 3 rack roughing mills, and total reduction 87.5%, roughing exit thickness is 10mm, at the beginning of roughing Beginning temperature is 1145~1155 DEG C, and roughing finishing temperature is 1015~1025 DEG C, unit width draught pressure for 14.3~ 16.6KN/mm。
(3) insulation cover is kept the temperature
The insulation cover length is 11m, and insulation cover interior environment temperature is 550 DEG C.
(4) sensing heating
The induction heating apparatus includes 14 heaters, and each heater power is 2800~2900KW.Sensing heating Middle base temperature is set to raise 290~300 DEG C, base temperature is 1175~1185 DEG C among induction heating apparatus outlet.Computer is certainly Autocontrol system sets sensing heater according to the observed temperature of induction heater entrance pyrometer and starts quantity and power, according to The observed temperature of sensing heating outlet of still pyrometer adjusts sensing heater power, realizes base temperature among sensing heating outlet of still Feedback control.
(5) high-pressure water descaling
The high pressure water descaling device includes upper and lower two collectors, and 46 platypelloid type nozzles, nozzle are set on each collector Spacing is 35mm, and collector spraying width is 1720mm, and hydraulic pressure 40MPa, total water current amount is 180m3/ h, de-scaling make middle base table Face temperature drop is 92~97 DEG C.Computer automatic control system is according to the speed of middle base and the reality of descaling device inlet centre base Testing temperature adjusts hydraulic pressure and water flow.
(6) finish rolling
The mm finishing mill unit is 5 rack finishing mills, and total reduction 92%, finish rolling exit thickness is 0.8mm, and finish rolling is initial Temperature is 1015~1025 DEG C, and finish rolling finishing temperature is 840~850 DEG C, and unit width draught pressure is 8.1~20KN/mm.
(7) control cooling
The Controlled cooling process is then air-cooled first to carry out section cooling to strip.Specially：
The control cooling section includes 35 upper headers and 105 lower collector pipes, under the sprinkling zone of each upper header and 3 The sprinkling zone of collector corresponds to.The maximum stream flow of each upper header is 120~135m3/ h, the maximum stream flow of each lower collector pipe are 40~45m3/ h, upper header spacing are 1110mm, and next part tube spacing is 370mm.
Computer automatic control system according to control cooling section strip steel at entry temperature, speed and thickness setting upper header and under The unlatching quantity of collector, and the water flow of upper header and lower collector pipe is carried out presetting, realize air-cooled after strip elder generation section cooling Cooling technique.The upper header being had turned on according to the deviation feedback regulation of belt steel temperature measured value and target coiling temperature before batching With the water flow of lower collector pipe.
It is described that to control cooling section strip steel at entry temperature be 825~835 DEG C, at the end of section cooling belt steel temperature for 610~ 620 DEG C, hydraulic pressure 0.08MPa, section cooling speed is 520~540 DEG C/s.The air cooling time is 4s.
(8) bundling is sheared and batched
The bundling shearing uses rotary hub type flying shear, and the coiling machine is underground type coiling machine.Unit width rolls up weight 21kg/mm, coiling temperature are 540~550 DEG C.
By such scheme, the first roughing mill reduction ratio of the roughing mills is 50%, rolling temperature control 1145~ 1155 DEG C, unit width draught pressure is 14.3~14.5KN/mm；Second roughing mill reduction ratio is 52.5%, rolling temperature control For system at 1080~1090 DEG C, unit width draught pressure is 15.8~16.1KN/mm；3rd roughing mill reduction ratio is 47.4%, Rolling temperature is controlled at 1015~1025 DEG C, and unit width draught pressure is 16.4~16.6KN/mm.
By such scheme, the first finishing mill reduction ratio of the mm finishing mill unit is 60%, rolling temperature control 1015~ 1025 DEG C, unit width draught pressure is 18.4~18.7KN/mm；Second finishing mill reduction ratio is 47.5%, rolling temperature control For system at 965~975 DEG C, unit width draught pressure is 19.8~20KN/mm；3rd finishing mill reduction ratio is 40%, rolling temperature At 935~945 DEG C, unit width draught pressure is 17.3~17.6KN/mm for degree control；4th finishing mill reduction ratio is 28%, Rolling temperature is controlled at 890~900 DEG C, and unit width draught pressure is 14.8~15.1KN/mm；5th finishing mill reduction ratio is 11.1%, rolling temperature is controlled at 840~850 DEG C, and unit width draught pressure is 8.1~8.4KN/mm.
By such scheme, hydraulic AGC technology is used in roughing and mm finishing mill unit.Specially：Before rolling Roller gap preset is carried out, exporting calibrator according to the 3rd roughing mill in the operation of rolling surveys thickness to middle base thickness feedback control System, surveys thickness according to the 5th finishing mill outlet calibrator and finished strip thickness feedback is controlled.Passed according to main hydraulic cylinder pressure Sensor measured value carries out roll-force overload protection.
By such scheme, the positive and negative roller technology of working roll is used in roughing mills, working roll is used in mm finishing mill unit Positive roller and working roll roll shifting technology.Design parameter is as shown in table 1：
Table 1
By such scheme, working roll dynamic cooling technology is used in roughing and mm finishing mill unit.Specially：Working roll moves State cooling includes main cooling, middle part supplement heat rejecter and edge supplement heat rejecter.It is 0.9MPa to cool down water injection pressure, each rack work Roller cooling water total flow, each refrigerating mode cooling water flow ratio and flow pre-set value are as shown in table 2, pass through presetting and tune The total cooling water inflow and ratio of three kinds of refrigerating modes are saved, has load roller to adjust each rack work roll thermal roll shape, and then adjust Stitch the purpose of convexity.
Table 2
By such scheme, dynamic variable specification technology is used in mm finishing mill unit.Specially：1.5mm thickness finished products are used first The finish rolling rolling procedure of strip carries out threading and rolling, after the coil of strip for producing a 1.5mm thickness, using the dynamic of mm finishing mill unit Become pressure and the mill speed of each finishing stand of specification function point analysis, finished strip thickness is changed into 1.2mm from 1.5mm, produce After going out the coil of strip of a 1.2mm thickness, then 1mm is changed to by 1.2mm and produces a coil, then changed to 0.9mm from 1mm and produce a coil, Finally from 0.9mm change to 0.8mm after steady production.Then by thin thickening during whipping, carried out by above-mentioned opposite mode.
By such scheme, roll gap lubrication technology is used in mm finishing mill unit.Specially：Each rack is used for roll gap lubrication Concentration of lubricating oil is 0.35%, injection flow 6000L/min, and injection pressure is 0.3MPa.
By such scheme, for section cooling positioned at control cooling section inlet, it is 3 that laminar flow cooling upper header, which opens quantity, The unlatching quantity of lower collector pipe is 12.The water flow set point of each upper header is 126m3/ h, the water flow of each lower collector pipe are set Definite value is 42m3/ h, section cooling hydraulic pressure are 0.08MPa.
Longitudinal thickness deviation≤25 μm of the finished strip of the 0.8mm thickness obtained using the present embodiment method, plate shape deviation ≤ 20I, it is wide to convexity deviation C40≤15μm.Yield strength is 276~285MPa, and tensile strength is 351~363MPa, elongation percentage For 36~39%.
The embodiment of the present invention is described above in conjunction with attached drawing, but the invention is not limited in above-mentioned specific Embodiment, above-mentioned embodiment is only schematical, rather than restricted, those of ordinary skill in the art Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make very much Form, these are belonged within the protection of the present invention.

Claims (10)

  1. A kind of 1. method that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, it is characterised in that comprise the following steps：
    (1) prepare molten steel, the molten steel includes following components, by mass percentage for：C 0.05%~0.1%, Si 0.01% ~0.04%, Mn 0.08%~0.2%, Al 0.02%~0.04%, P≤0.015%, S≤0.01%, N≤0.006%, Ca≤0.0012%, Cu≤0.15%, Sn≤0.02%, Ni≤0.2%, Cr≤0.12%, Mo≤0.05%, V≤0.01%, Remaining trace element for Fe and inevitably；By molten steel direct casting into width be 1300~1600mm, thickness be 60~ The continuous casting billet of 100mm, the casting speed of the continuous casting billet is 5.2~7m/min, and maximum casting speed vmaxIt is thick with continuous casting billet The numerical relation for spending h meets：vmax=9.76 × 10-4h2-0.248h+20.25；
    (2) roughing is carried out, roughing mills be 3 rack roughing mills, and total reduction is 85%~90%, roughing exit thickness is 9~ 11mm, roughing initial temperature are 1140~1160 DEG C, and roughing finishing temperature is 1010~1030 DEG C, and unit width draught pressure is 14~17KN/mm；
    (3) kept the temperature in insulation cover, insulation cover interior environment temperature is 500~550 DEG C；
    (4) sensing heating is carried out by induction heating apparatus, middle base temperature is raised 280~300 DEG C, induction heating apparatus goes out Base temperature is 1170~1190 DEG C among mouthful；
    (5) high-pressure water descaling is carried out by high pressure water descaling device；
    (6) finish rolling is carried out, mm finishing mill unit is 5 rack finishing mills, and total reduction is 88%~93%, and finish rolling exit thickness is 0.8 ~1mm, finish rolling initial temperature are 1010~1030 DEG C, and finish rolling finishing temperature is 830~850 DEG C, and unit width draught pressure is 8 ~20KN/mm；The ultrathin strip that width is 1300~1600mm, thickness is 0.8~1mm is obtained after finish rolling；
    (7) section cooling is carried out to strip in control cooling section, then carries out air-cooled, control the cooling section strip steel at entry temperature to be 810~840 DEG C, belt steel temperature is 600~630 DEG C at the end of section cooling, and section cooling speed is 400~600 DEG C/s；It is air-cooled Time is 3~5s；
    (8) bundling is sheared and batched.
  2. 2. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In the high pressure water descaling device includes upper and lower two collectors, sets 46 platypelloid type nozzles on each collector, injector spacing is 35mm, collector spraying width are 1720mm, and hydraulic pressure is 37~42MPa, and total water current amount is 170~190m3/ h, de-scaling make middle base Surface temperature drop is 90~110 DEG C.
  3. 3. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In the control cooling section includes 35 upper headers and 105 lower collector pipes, the sprinkling zone of each upper header and 3 lower collector pipes Sprinkling zone correspond to, the flow of each upper header is 120~150m3/ h, the flow of each lower collector pipe is 40~50m3/ h, on Integrate tube spacing as 1110mm, next part tube spacing is 370mm, and computer automatic control system is according to control cooling section strip steel at entry temperature Degree, speed and thickness set the upper header of control cooling entrance and the unlatching quantity of lower collector pipe respectively, and to upper header with The water flow of collector carry out it is presetting, according to the deviation feedback regulation of belt steel temperature measured value and target coiling temperature before batching The upper header of unlatching and the water flow of lower collector pipe.
  4. 4. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In the bundling shearing uses rotary hub type flying shear, and coiling machine is underground type coiling machine；Unit width volume weighs 20~22kg/mm, rolls up It is 530~550 DEG C to take temperature.
  5. 5. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In the thickness of strand is 75~85mm, and casting speed is 5.8~6.2m/min.
  6. 6. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist It is 48%~52% in the first roughing mill reduction ratio of, roughing mills, rolling temperature control is at 1140~1160 DEG C, unit Width draught pressure is 14.1~16KN/mm；Second roughing mill reduction ratio is 50%~55%, rolling temperature control 1075~ 1095 DEG C, unit width draught pressure is 15~16.5KN/mm；3rd roughing mill reduction ratio is 45%~50%, rolling temperature At 1010~1030 DEG C, unit width draught pressure is 15.5~16.7KN/mm for control.
  7. 7. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In in the step (6), the first finishing mill reduction ratio is 58%~62%, and rolling temperature control is at 1010~1030 DEG C, unit Width draught pressure is 17~19KN/mm；Second finishing mill reduction ratio is 45%~50%, and rolling temperature is controlled 960~980 DEG C, unit width draught pressure is 19~20KN/mm；3rd finishing mill reduction ratio is 37%~43%, and rolling temperature control exists 925~945 DEG C, unit width draught pressure is 16.5~18KN/mm；4th finishing mill reduction ratio is 25%~30%, rolling For temperature control at 880~900 DEG C, unit width draught pressure is 14~15.2KN/mm；5th finishing mill reduction ratio for 10%~ 15%, rolling temperature is controlled at 830~850 DEG C, and unit width draught pressure is 8~8.7KN/mm.
  8. 8. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In using hydraulic AGC in roughing and mm finishing mill unit, carry out roller gap preset before the rolling, in the operation of rolling Calibrator actual measurement thickness is exported according to the 3rd roughing mill to control middle base thickness feedback, according to the 5th finishing mill outlet calibrator Survey thickness to control finished strip thickness feedback, carrying out roll-force overload according to main hydraulic cylinder pressure sensor measurements protects Shield.
  9. 9. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In using the positive and negative roller technique of working roll in roughing mills, altered in mm finishing mill unit using the positive roller of working roll and working roll Roller technique, it on every side shaft holder is 900~1200KN that the positive bending roller force of roughing mill, which is, negative bending roller force be on every side shaft holder for- 1300~-1700KN, it on every side shaft holder is 1500~1700KN that the positive bending roller force of first, second finishing mill of mm finishing mill unit, which is, Working roll roll shifting scope is 100~120mm, and the positive bending roller force of the 3rd finishing mill, the 4th finishing mill and the 5th finishing mill is per side It is 850~1000KN on bearing block, working roll roll shifting scope is -180~-200mm.
  10. 10. the method according to claim 1 that ultra-thin mild steel is produced using continuous casting and rolling technique of sheet bar, its feature exist In using working roll dynamic cooling in roughing mills and mm finishing mill unit, including main cooling, middle part supplement heat rejecter and edge are auxiliary Cooling is helped, cooling water injection pressure is 0.8~1MPa, and each total cooling water inflow of pony roughing mill is 1000~1200m3/ h, each The total cooling water inflow of finishing stand is 900~1000m3/h。
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