CN100430161C - Cast rolling method and equipment of isometric crystal ferrite stainless steel slab band - Google Patents
Cast rolling method and equipment of isometric crystal ferrite stainless steel slab band Download PDFInfo
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- CN100430161C CN100430161C CNB2006101350845A CN200610135084A CN100430161C CN 100430161 C CN100430161 C CN 100430161C CN B2006101350845 A CNB2006101350845 A CN B2006101350845A CN 200610135084 A CN200610135084 A CN 200610135084A CN 100430161 C CN100430161 C CN 100430161C
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Abstract
The invention relates to a method for rolling equiax crystal ferrite stainless steel band, wherein it uses ferrite stainless steel as base material, to be fused, slag blown, preheated, irrigated and rolled into ferrite stainless band. The rolling temperature is controlled 1500-1600 Deg. C; the rolling speed is 10-50m/min; the rolling pressure is 50-200KN. And the inventive device comprises middle-frequency sensitive furnace, rolling machine, middle pack; the rolling machine is dual-roller horizontal rolling machine with internal cooling roller; the rolling machine has online preheater, online gas supplier, online pool temperature detector and pool level height detector, automatic roller slim adjuster, roller speed automatic adjuster. The invention can avoid electromagnetic mixing technique, and titanium element, to shorten the process, whilet the equiax crystal degree is 100%.
Description
Technical field
The present invention relates to ferrite stainless steel band preparing technical field, particularly ferrite stainless steel band equiax crystal rolling casting technology.
Background technology
Ferritic stainless steel is meant that chromium content 11%～30%, has body-centered cubic crystal structure, under user mode based on the stainless steel of ferritic structure.Ferritic stainless steel except that having rustless property and anti-general corrosion performance, local corrosion function admirables such as the anti-spot corrosion of its burn into of anti-chloride stress cracking the, slit and corrosion resistant.In addition, the intensity height of ferritic stainless steel, the cold work hardening tendency is low, the thermal conductivity factor height, linear expansion coefficient is lower.Therefore, from being born till now, ferritic stainless steel has obtained to use widely in the time of last 100 years.
Because ferritic stainless steel is nickeliferous or only contain a spot of nickel, its low production cost rises suddenly and sharply at international nickel valency at present, under the austenitic stainless steel price condition with higher, and its demand and use amount increase rapidly.
The ferrite stainless steel band mainly is to be used in kitchen tools (punching out pot, bowl, basin, service plate etc.) and household electrical appliance (punching out washing machine inner tub, water heater liner etc.) except that being used in decoration and automobile exhaust field.This just requires it not only good surface quality will be arranged, and extraordinary processability will be arranged., utilize ferrite stainless steel band that traditional continuous casting-rolling-annealing process produces in the process of user's fabricated product, surface quality poor (for example surperficial fold phenomenon is serious), and also deep drawability is poor, and the r value is on the low side.This is because the ferrite stainless steel continuous casting billet produces the serious thick column crystal of component segregation when solidifying, the inhomogeneities of this composition, in subsequently hot-working and heat treatment process, be difficult to eliminate fully, and with the increase of processing capacity, distribute along rolling to being line style, because the deviation of this chemical composition causes the inhomogeneous and anisotropic of material deformation performance, thereby has produced surperficial fold, and makes processability very poor.
So one of effective way of improving ferrite stainless steel band surface quality and processability in punch process is exactly the column crystal ratio that reduces strand, improves equiaxial crystal ratio.The approach that improves the strand equiaxial crystal ratio at present mainly contains two: the one, add the alloying element titanium when smelting; The 2nd, in casting process, adopt electromagnetic agitating technology.The intelligence of appointing of Taiyuan Iron And Steel Co., Ltd is bravely pointed out, adds a certain amount of Ti in ferritic stainless steel, can refinement cast sturcture, and this mainly is that forming core effect because of TiN causes.But the addition of Ti is too much unsuitable, otherwise can reduce the degree of purity of steel, causes the slab reconditioning quality to increase, and cold rolling finished surface quality and serviceability are brought adverse effect.In addition,, need that also [N] in the steel, [O] content is controlled at 150 * 10-6 respectively and below 50 * 10-6, and adopt measure such as non-oxidation protection cast at containing the characteristics that the Ti ferritic stainless steel easily forms defectives such as subsurface inclusion and skull patch when the continuous casting.As seen, utilize to add that titanium improves strand equiaxial crystal ratio complicated operation and effect is undesirable.And most of ferritic stainless steel enterprise mostly adopts another kind of technology---electromagnetic agitating technology.When adopting electromagnetic agitation, the degree of superheat is controlled between 30 ℃～50 ℃, can guarantee that strand forms 30%～50% proportion of equiaxed grain.But, the electromagnetic stirring equipment costliness, fault is frequent, the operating cost height, and also equiaxial crystal ratio is not high.
Summary of the invention
The objective of the invention is provides a kind of rolling casting technology and equipment of isometric crystal ferrite stainless steel slab band at present ferrite stainless steel band strand equiax crystal chemical control system complex process, apparatus expensive, technical problem that equiaxial crystal ratio is lower.
Mainly be to be base stock with the ferritic stainless steel, comprise two series of low chrome ferritic stainless steel and middle chrome ferritic stainless steel, its chemical composition scope is respectively: [C]≤0.1%, [Si]≤0.6%, [Mn]≤0.3%, [S]≤0.005%, [P]≤0.02%, [Cr]=11～11.5%, [Ti]≤0.5%, [Nb]≤0.3%, Fe are surplus; [C]≤0.12%, [Si]≤0.75%, [Mn]≤0.80%, [S]≤0.030%, [P]≤0.035%, [Cr]=16～18%, [Ni]≤0.60%, Fe are surplus.Utilize melting, blow slag, preheating, cast, rolling casting technology, in conjunction with control technologies such as poring rate, bath liquid level, roller gap, roll casting speed, casting pressure, the ferrite stainless steel band that it is equiax crystal all almost that casting goes out as-cast structure, do not have column crystal.
The rolling casting technology of isometric crystal ferrite stainless steel slab band of the present invention comprises following steps.
1) melting: behind ferritic stainless steel raw material preheating to 100～300 ℃, put into intermediate frequency furnace,, in induction furnace, feed inert gas (argon gas), under inert protective gas, carry out melting by feeder when temperature reaches 900 ℃～1200 ℃.The heating power of intermediate frequency furnace is 10KW～50KW.
2) blow slag: when the ferritic stainless steel temperature reaches 1200 ℃～1600 ℃, add the stainless steel slagging agent, stir refining, refining time is 5～30min, feeds argon gas, and air pressure is 3～20 atmospheric pressure, leaves standstill 5～30min after blowing slag;
3) preheating: when the ferritic stainless steel temperature reaches 1100 ℃～1300 ℃, preheating tundish, pouring mouth, cloth chute, side seal board 10～30min;
4) cast: liquid ferritic stainless steel is poured in the tundish under gas shield (argon gas) condition, tundish will keep ferrite stainless molten steel constant temperature (1480 ℃～1600 ℃), and (apart from cloth chute least significant end 10～20cm), poring rate is 20Kg～30Kg/min to control the constant height of ferrite stainless molten steel bath of two casting roll shop buildings;
5) casting: ferritic stainless steel flows into casting and rolling machine by the cloth chute, the control temperature is 1500 ℃～1600 ℃ under protective gas, roll casting speed is 10～50m/min, casting pressure is 50～200KN, roller gap is 1.0mm～7.0mm, is rolled into the isometric crystal ferrite stainless steel slab band that 25cm is wide, 1mm～8mm is thick;
6) back processing: above-mentioned strip is heated to 1100～1200 ℃ through heating furnace, insulation 0.5h, under the hot rolling 10%～20%, annealed 1～5 hour for 800～900 ℃ then, be cold-rolled to 0.5～1.0mm again, last 800～900 ℃ of annealing 0.5～3min produce the ferrite stainless steel band of desired thickness.
The casting and rolling installation that the present invention adopts comprises intermediate frequency furnace, casting and rolling machine, side seal board, pouring mouth, cloth chute, tundish, automatic roll gap adjustment device, online bath temperature-detecting device, manual pouring device, online preheating device, online feeder, bath liquid level detection device, roller speed self-checking device, strip clamping and conveying device.
Intermediate frequency furnace and tundish all adopt the filling inert gas shielding, and online feeder can be controlled the flow of protective gas, and pouring mouth is positioned at a side of tundish bottom, and the cloth chute is installed in the pouring mouth bottom.Side seal board is close to the edge of two rolls, prevents the molten steel side leakage.Tundish is made up of inner liner, heat-insulation layer, outer layer plate, and for the ease of insulation, casting and rolling machine is provided with online preheating device, and online preheating device is connected with preheated fuel gas nozzle on the tundish, is used for preheating tundish, pouring mouth, cloth chute and side seal board; Consider the flow velocity of molten metal weight and pouring mouth, tundish length is 0.3m～3m, and width is 0.1m～2m, highly is 0.2～1.5m, and the diameter of pouring mouth is 2cm～50cm.Intermediate frequency furnace is provided with manual apparatus for pouring, by the liquid level of control inflow tundish, and the flow velocity of control pouring mouth, and then the height of control bath.Casting and rolling machine also is provided with online bath temperature-detecting device, with the bath liquid level detection device, they are fixed on respectively on the support of casting and rolling machine oblique upper, tiltedly facing to bath, measure the temperature and the height of bath inner metal liquid, guarantee that molten metal is in the metastable inflow casting of same temperature rod.Casting and rolling machine is two roller horizontal casting and rolling machines, disposes the inner-cooled roll, and inside is connected with cooling water, cooling water inlet temperature is 0～25 ℃, outlet temperature is not more than 10～50 ℃, by regulating hydraulic pressure, flow, improves the surperficial capacity of heat transmission of roll, improve the curdled appearance of ferritic stainless steel molten steel, when making molten metal flow through roller gap, by rapid solidification, crystallization, force worker and tissue and improve and to combine, eliminate thick column crystal, eliminate segregation, obtain 100% equiax crystal.Casting and rolling machine is provided with the roll gap self-checking device, regulates roll gap by automatic roll gap adjustment device, obtains the equiax crystal ferritic stainless steel casting strip of different-thickness.The casting roller of casting and rolling machine can be a copper, also can be steel alloy, and these material thermal conductivity are good, and cold-resistant hot alternate load has quite high strength and stiffness, not with fusant reaction.In the melting of molten metal, flow, adopt inert gas to protect in the strip casting process, improved ferritic stainless steel molten steel chemical Composition Control precision, improved the degree of purity of ferritic stainless steel molten steel, improved the surface quality of casting strip.The roll surface graphite lubrication.The strip clamping and conveying device is along being listed as the exit that is installed in casting and rolling machine, and the strip that casting goes out derives through the strip clamping and conveying device.The subsequent handling of casting and rolling installation also is furnished with finishing mill (hot-rolling mill, cold-rolling mill) and annealing furnace, and the equiax crystal ferritic stainless steel that 0.5～8mm that casting is gone out is thick carries out required rolling and annealing in process.
The casting and rolling installation of aforesaid isometric crystal ferrite stainless steel slab band, described induction furnace are 30～double centner intermediate frequency furnace; Described tundish is made up of inner liner, heat-insulation layer, outer layer plate, and pouring mouth, pouring mouth diameter are arranged at the tundish bottom is 2cm～50cm, and tundish length is 0.3m～3m, and width is 0.1m～2m, highly is 0.2～1.5m; Described roll side seal board is a quartz material, and section configuration is an isosceles trapezoid; Described cloth chute is made up of inner liner, outer layer plate, and the inner liner layout is a shunting; Described casting and rolling machine is two roller horizontal casting and rolling machines, dispose the inner-cooled roll, inside is connected with cooling water, cooling water inlet temperature is 0～25 ℃, 10～50 ℃ of outlet temperatures, roller diameter: Φ 300mm～2000mm, the wide 10cm～300cm of roller, roll-force 50～4000KN, roll casting speed are 5～50m/min; Roller shell is copper sheathing or steel bushing, and roll surface adopts graphite lubrication; The casting and rolling installation of isometric crystal ferrite stainless steel slab band is provided with also that prestressing force is rolling, roll-force and preload force display unit.
The outstanding substantive distinguishing features and the significant effect of technical solution of the present invention are mainly reflected in:
1) the present invention compares with the conventional production methods of original ferrite stainless steel band, need not to adopt electromagnetic agitating technology, need not to add titanium elements, reduced production cost, shorten the production procedure of ferrite stainless steel band, make that the equiaxed zone ratio of ferrite stainless steel band is 100%, fundamentally improve surface quality and the processability of ferrite stainless steel alternate product in process, increased the product competitiveness of ferrite stainless steel band.
2) intermediate frequency furnace of the present invention, tundish, pouring mouth all adopt the hydraulic reclamation inert gas shielding; and whole process adopts inert gas to carry out the protection of industrial environment; prevented effectively the ferritic stainless steel molten steel in melting, flow, the oxidizing fire in the strip casting process; improved ferritic stainless steel molten steel chemical Composition Control precision; improve the degree of purity of ferritic stainless steel molten steel, improved the surface quality of casting strip.
3) casting and rolling machine of the present invention is provided with automatic adjusting roll gap device, online bath temperature-detecting device, manual apparatus for pouring, online preheating device, roller speed self-checking device, bath liquid level detection device, can realize regulating automatically roll gap, manually poring rate control, monitor the bath temperature automatically, keep the bath liquid level constant, keep the interior ferritic stainless steel molten steel temperature of bath even.
4) casting and rolling machine of the present invention is furnished with the inner-cooled roll, inside is connected with cooling water, by regulating hydraulic pressure, flow, improve the surperficial capacity of heat transmission of roll, improve the curdled appearance of ferritic stainless steel molten steel, when making molten metal flow through roller gap, by rapid solidification, crystallization, force worker and tissue and improve and to combine, eliminate thick column crystal, eliminate segregation, obtain 100% equiax crystal.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a cloth chute internal shunt schematic diagram.
Fig. 3 is the tundish schematic internal view.
Fig. 4 is 100% an equiax crystal schematic diagram of casting strip metallographic structure, and wherein: (a) being cross section tissue's schematic diagram of strip, (b) is that schematic diagram is organized in the longitudinal section of strip.
Among the figure: 1 intermediate frequency furnace, 2 casting and rolling machines, 3 side seal boards, 4 pouring mouths; 5 cloth chutes, 6 tundish, 7 automatic roll gap adjustment devices; 8 online bath temperature-detecting devices, 9 manual pouring devices, 10 online preheating devices; 11 online feeders, 12 bath liquid level detection devices, 13 rollers speed self-checking device; 14 strip clamping and conveying devices, 15 protective gas ingress pipes, 16 cover plates; 17 protective gas nozzles, 18 preheated fuel gas nozzles, 19 pouring mouth link slots.
The specific embodiment
As shown in Figure 1, the present invention adopts the casting and rolling installation of a kind of isometric crystal ferrite stainless steel slab band that comprises intermediate frequency furnace 1, casting and rolling machine 2, side seal board 3, pouring mouth 4, cloth chute 5, tundish 6.Intermediate frequency furnace 1 and tundish 6 equal filling inert gas shieldings, online feeder 11 can be controlled the flow of protective gas, and pouring mouth 4 is positioned at a side of tundish bottom, and 5 cloth chutes vertically link to each other up and down with pouring mouth 4.6 tundish are made up of inner liner, heat-insulation layer, outer layer plate, are provided with online preheating device 10, preheating tundish 6, pouring mouth 4, cloth chute 5 and side seal board 3 for the ease of insulation casting and rolling machine 2; Consider the flow velocity of molten metal weight and pouring mouth 4,6 tundish length are 0.3m～3m, and width is 0.1m～2m, highly are 0.2～1.5m, and the diameter of pouring mouth 4 is 2cm～50cm.Intermediate frequency furnace 1 is provided with manual apparatus for pouring 9, by the liquid level of control inflow tundish 6, and the flow velocity of control pouring mouth 4, and then the height of control bath.Casting and rolling machine 2 also is provided with online bath temperature-detecting device 8, with online preheating device 10, bath liquid level detection device 12, roller speed self-checking device 13, the temperature and the height of control and adjusting bath inner metal liquid guarantee that molten metal is in the metastable inflow casting of same temperature rod.Online bath temperature-detecting device 8 and bath liquid level detection device 12 are fixed on respectively on the support of casting and rolling machine 2 oblique uppers, tiltedly facing to bath.Casting and rolling machine 2 is two roller horizontal casting and rolling machines, disposes the inner-cooled roll, and inside is connected with cooling water, cooling water inlet temperature is 0～25 ℃, outlet temperature is not more than 10～50 ℃, by regulating hydraulic pressure, flow, improves the surperficial capacity of heat transmission of roll, improve the curdled appearance of ferritic stainless steel molten steel, when making molten metal flow through roller gap, by rapid solidification, crystallization, force worker and tissue and improve and to combine, eliminate thick column crystal, eliminate segregation, obtain 100% equiax crystal.Casting and rolling machine 2 is provided with the roll gap self-checking device, regulates roll gap by automatic roll gap adjustment device 7, obtains the equiax crystal ferritic stainless steel casting strip of different-thickness.The casting roller of casting and rolling machine 2 can be a copper, also can be steel alloy, and these material thermal conductivity are good, and cold-resistant hot alternate load has quite high strength and stiffness, not with fusant reaction.In the melting of molten metal, flow, adopt inert gas to protect in the strip casting process, improved ferritic stainless steel molten steel chemical Composition Control precision, improved the degree of purity of ferritic stainless steel molten steel, improved the surface quality of casting strip.The roll surface graphite lubrication.The strip that casting goes out derives through strip clamping and conveying device 14, and the subsequent handling of casting and rolling installation also is furnished with hot-rolling mill, cold-rolling mill and annealing furnace, and the equiax crystal ferritic stainless steel that 0.5～8mm that casting is gone out is thick carries out required rolling and annealing in process.
Above-mentioned induction furnace is 30～double centner intermediate frequency furnace; Described tundish is made up of inner liner, heat-insulation layer, outer layer plate, and pouring mouth, pouring mouth diameter are arranged at the tundish bottom is 2cm～50cm, and tundish length is 0.3m～3m, and width is 0.1m～2m, highly is 0.2～1.5m; Described roll side seal board is a quartz material, and section configuration is an isosceles trapezoid; Described cloth chute is made up of inner liner, outer layer plate, and the inner liner layout is a shunting; Described casting and rolling machine is two roller horizontal casting and rolling machines, dispose the inner-cooled roll, inside is connected with cooling water, cooling water inlet temperature is 0～25 ℃, 10～50 ℃ of outlet temperatures, roller diameter: Φ 300mm～2000mm, the wide 10cm～300cm of roller, roll-force 50～4000KN, roll casting speed are 5～50m/min; Roller shell is copper sheathing or steel bushing, and roll surface adopts graphite lubrication; The casting and rolling installation of described isometric crystal ferrite stainless steel slab band is provided with that prestressing force is rolling, roll-force and preload force display unit; The subsequent handling of the casting and rolling installation of affiliated isometric crystal ferrite stainless steel slab band also is furnished with finishing mill and annealing furnace.
As shown in Figure 2, cloth chute 5 is made of outer steel plate, liner and three blocks, and liner and block bond together, and its material is magnesia.Cloth chute 5 and pouring mouth 4 are in the same place by bolting, and the protective gas ingress pipe then is blown into protective gas by the aperture on the pouring mouth 4.
As shown in Figure 3; tundish 6 is made of outer steel plate, liner and cover plate 16; pouring mouth link slot 19 is positioned at a side of tundish 6 bottoms, and protective gas nozzle 17 and preheated fuel gas nozzle 18 are stuck in three circular apertures of cover plate 16, spray into fuel gas and protective gas in tundish 6.
The automatic roll gap adjustment device that is adopted, housing screw are to push up on the bearing block of roll, need to reserve in advance certain roll gap before the casting, and this roll gap is set by adjusting housing screw.And then, roll gap is adjusted to zero with spring compression casting roller.During casting, rely on the casting roller of rotation that metal in the bath is brought into, form certain thickness behind the metal freezing, just the casting roller is produced pressure, and then again with the spring compression, pressure is big more, the spring compression is just severe more.By this spring, realized the automatic adjusting of roll gap along with pressure size between casting roller and strip, avoided roll gap too small and take place roll the card phenomenon.
Online bath temperature-detecting device has mainly adopted the double-colored optical fiber type temperature measurer of the FR1C of a Raytek company, links to each other with computer.Its temperature-measuring range is 500 ℃～2500 ℃, and the response time is 10ms, and output current is 4～20mA.
Manually the pouring device intermediate frequency furnace is connected on the support of dolly by a turning cylinder, also be connected with a handle that about 1m is long on the turning cylinder, turning handle drives intermediate frequency furnace and sways up and down, promptly realized the casting process of intermediate frequency furnace, velocity of rotation has determined poring rate.
Online preheating device mainly is made up of propane bottle, oxygen cylinder, conduit, gas nozzle, by the propane pressure table on control propane bottle, the oxygen cylinder, oxygen gauge control gas flow.
Online feeder mainly is made up of argon bottle, conduit, by the flow of the argon pressure table control protective gas on the control argon bottle.
The bath liquid level detection device mainly is made up of the digital kink detector that shows of the MH type an of Lucheng Sensor Co., Ltd., Changzhou, this detector is accepted infrared light that the bath inner metal liquid radiates and direct imaging to ccd sensor, make the position of liquid level in the surveyed area corresponding one by one with the position that CCD goes up image by optical system, linear, by handling, convert to and the corresponding analog signal of object space, output on the computer.
Roller speed self-checking device mainly is made up of motor, 590 DC speed regulators, decelerator (speed reducing ratio 40: 1), and 590 DC speed regulators can be controlled motor speed, motor driving reducer, and decelerator drives the casting roller and rotates.590 DC speed regulators are by computer-controlled.
The strip clamping and conveying device mainly is made up of 6RA70 ac speed regulator, motor, decelerator, and the 6RA70 ac speed regulator can be controlled motor speed, motor driving reducer, and decelerator drives the casting roller and rotates.The 6RA70 ac speed regulator is by computer-controlled.
Chemical composition is: [C]≤0.12%, [Si]≤0.75%, [Mn]≤0.80%; [S]≤0.030%; [P]≤0.035%, [Cr]=16～18%, [Ni]≤0.60%; Fe is after the raw material of the ferritic stainless steel of surplus passes through preheating; put into 40Kg intermediate frequency furnace 1, heating power is 10KW, when temperature reaches 900 ℃; in induction furnace 1, feed inert gas by feeder 11, under inert protective gas, carry out melting.When temperature reaches 1200 ℃, add the agent of DFC-700 stainless steel slagging, stir refining 5min, leave standstill 5min behind the feeding air-blowing slag.Then, when temperature reaches 1100 ℃, preheating tundish 6, pouring mouth 4, cloth chute 5, side seal board 3 about 10min.When liquid ferritic stainless steel temperature reaches 1480 ℃, and insulation 10min, under the inert gas shielding condition, being poured into 6 li of tundish, tundish 6 will keep 1470 ℃ of constant temperature of ferrite stainless molten steel.The constant height from manual apparatus for pouring 9 control tundish 6 inner metal liquids by intermediate frequency furnace 1 is 0.2m, flows into 2 liang of castings of casting and rolling machines roll shop building through pouring mouth 4 and cloth chute 5, forms the bath of liquid level constant (apart from cloth chute 5 least significant end 10cm).At last, molten metal in the bath evenly flows through two roll seams that roll gap is 1.0mm under 1450 ℃ same temperature, casting and rolling machine 2 roller diameters are 500mm, and roll surface width is 250mm, maximum rolling force 100KN, the control roll casting speed is 10m/min, carries out casting, and casting goes out 100% thick isometric crystal ferrite stainless steel slab band of 1.2mm, be heated to 1100 ℃ again, the thick production board of 0.5mm is produced in 10%, 850 ℃ of annealing of hot rolling 3 hours.Main performance is σ s=280MPa, σ b=415MPa, n=0.256, r=1.38, δ=27%.
Chemical composition is: [C]≤0.1%, [Si]≤0.6%, [Mn]≤0.3%; [S]≤0.005%, [P]≤0.02%, [Cr]=11～11.5%; [Ti]≤0.5%; [Nb]≤0.3%, Fe are put into 40Kg intermediate frequency furnace 1 after being the ferritic stainless steel raw material process preheating of surplus; heating power is 25KW; when temperature reaches 1050 ℃, in induction furnace 1, feed inert gas by feeder 11, under inert protective gas, carry out melting.When temperature reaches 1200 ℃, add the agent of DFC-700 stainless steel slagging, stir refining 15min, feed and leave standstill about 15min after 5 atmospheric argon gas blow slag.Then, when temperature reaches 1300 ℃, preheating tundish 6, pouring mouth 4, cloth chute 5, side seal board 3 about 15min.When liquid ferritic stainless steel temperature reaches 1560 ℃, and insulation 10min, under the inert gas shielding condition, being poured into 6 li of tundish, tundish 6 will keep 1540 ℃ of constant temperature of ferrite stainless molten steel.The constant height of controlling tundish 6 inner metal liquids by the manual apparatus for pouring 9 of intermediate frequency furnace 1 is 0.2m, poring rate is 30Kg/min, flow into 2 liang of castings of casting and rolling machine roll shop building through pouring mouth 4 and cloth chute 5, form the bath of liquid level constant (apart from cloth chute 5 least significant end 10cm).At last, molten metal in the bath evenly flows through two roll seams that roll gap is 1.8mm under 1530 ℃ same temperature, casting and rolling machine 2 roller diameters are 500mm, roll surface width is 250mm, maximum rolling force 200KN, and the control roll casting speed is 25m/min, carry out casting, casting goes out 100% thick isometric crystal ferrite stainless steel slab band of 2mm, through rolling and annealing, produces the thick production board of 0.5mm again.Main performance is σ s=220MPa, σ b=415MPa, δ=25%.
Chemical composition is: [C]≤0.12%, [Si]≤0.75%, [Mn]≤0.80%; [S]≤0.030%; [P]≤0.035%, [Cr]=16～18%, [Ni]≤0.60%; Fe is after the raw material of the ferritic stainless steel of surplus passes through preheating; put into 40Kg intermediate frequency furnace 1, heating power is 25KW, when temperature reaches 1050 ℃; in induction furnace 1, feed inert gas by feeder 11, under inert protective gas, carry out melting.When temperature reaches 1200 ℃, add the agent of DFC-700 stainless steel slagging, stir refining 15min, leave standstill 15min behind the feeding air-blowing slag.Then, when temperature reaches 1300 ℃, preheating tundish 6, pouring mouth 4, cloth chute 5, side seal board 3 about 15min.When liquid ferritic stainless steel temperature reaches 1490 ℃, and insulation 10min, under the inert gas shielding condition, being poured into 6 li of tundish, tundish 6 will keep 1470 ℃ of constant temperature of ferrite stainless molten steel.The constant height from manual apparatus for pouring 9 control tundish 6 inner metal liquids by intermediate frequency furnace 1 is 0.2m, flows into 2 liang of castings of casting and rolling machines roll shop building through pouring mouth 4 and cloth chute 5, forms the bath of liquid level constant (apart from cloth chute 5 least significant end 15cm).At last, molten metal in the bath evenly flows through two roll seams that roll gap is 1.4mm under 1460 ℃ same temperature, casting and rolling machine 2 roller diameters are 500mm, and roll surface width is 250mm, maximum rolling force 200KN, the control roll casting speed is 25m/min, carries out casting, and casting goes out 100% thick isometric crystal ferrite stainless steel slab band of 1.6mm, be heated to 1200 ℃ again, the thick production board of 0.5mm is produced in 20%, 850 ℃ of annealing of hot rolling 5 hours.Main performance is σ s=290MPa, σ b=400MPa, n=0.237, r=1.20, δ=25%.
Above-mentioned specific embodiment shows, the production experiment of the isometric crystal ferrite stainless steel slab band that employing present device and technical scheme are carried out, operations is functional, index up to specification, need not to adopt electromagnetic agitating technology, need not to add titanium elements, reduced production cost, shorten the production procedure of ferrite stainless steel band, make that the equiaxed zone ratio of ferrite stainless steel band is 100%, fundamentally improve surface quality and the processability of ferrite stainless steel alternate product in process, increased the product competitiveness of ferrite stainless steel band.
Claims (10)
1, the casting-rolling method of isometric crystal ferrite stainless steel slab band, it is characterized in that being: C≤0.1% with chemical composition, Si≤0.6%, Mn≤0.3%, S≤0.005%, P≤0.02%, Cr=11～11.5%, Ti≤0.5%, Nb≤0.3%, Fe are that the low chrome ferritic stainless steel or the chemical composition of surplus is: C≤0.12%, Si≤0.75%, Mn≤0.80%, S≤0.030%, P≤0.035%, Cr=16～18%, Ni≤0.60%, Fe are that the middle chrome ferritic stainless steel of surplus is a raw material, adopt following processing step:
1. melting: behind ferritic stainless steel raw material preheating to 100～300 ℃, put into intermediate frequency furnace,, in induction furnace, feed inert gas, under inert protective gas, carry out melting by feeder when temperature reaches 900 ℃～1200 ℃;
2. blow slag: when the ferritic stainless steel temperature reaches 1200 ℃～1600 ℃, add the stainless steel slagging agent, stir refining, refining time is 5～30min, feeds argon gas, leaves standstill 5～30min after blowing slag;
3. preheating: when the ferritic stainless steel temperature reaches 1100 ℃～1300 ℃, preheating tundish, pouring mouth, cloth chute, side seal board 10～30min;
4. cast: liquid ferritic stainless steel is poured in the tundish under the gas shield condition, tundish will keep 1480 ℃～1600 ℃ of ferrite stainless molten steel constant temperature, and control the constant height of ferrite stainless molten steel bath of two casting roll shop buildings, apart from cloth chute least significant end 10～20cm, poring rate is 20Kg～30Kg/min;
5. casting: ferritic stainless steel flows into casting and rolling machine by the cloth chute, the control temperature is 1500 ℃～1600 ℃ under protective gas, roll casting speed is 10～50m/min, casting pressure is 50～200KN, roller gap is 1.0mm～7.0mm, is rolled into the isometric crystal ferrite stainless steel slab band that 25cm is wide, 1mm～8mm is thick;
6. back processing: above-mentioned strip is heated to 1100～1200 ℃ through heating furnace, and insulation 0.5h is under the hot rolling 10%～20%, annealed 1～5 hour for 800～900 ℃ then, be cold-rolled to 0.5～1.0mm again, last 800～900 ℃ of annealing 0.5～3min produce the ferrite stainless steel band.
2, according to the casting-rolling method of the described isometric crystal ferrite stainless steel slab band of claim 1, it is characterized in that step 1. the heating power of intermediate frequency furnace be 10KW～50KW.
3,, it is characterized in that the 2. middle argon pressure of step is 3～20 atmospheric pressure according to the casting-rolling method of the described isometric crystal ferrite stainless steel slab band of claim 1.
4, according to the casting-rolling method of the described isometric crystal ferrite stainless steel slab band of claim 1, it is characterized in that step 4., 5. in protective gas be argon gas.
5, the equipment of the casting-rolling method of the described isometric crystal ferrite stainless steel slab band of claim 1 employing, comprise intermediate frequency furnace, casting and rolling machine, side seal board, pouring mouth, cloth chute, tundish, strip clamping and conveying device, it is characterized in that casting and rolling machine is two roller horizontal casting and rolling machines, dispose the inner-cooled roll, casting and rolling machine is provided with online preheating device, and online preheating device is connected with preheated fuel gas nozzle on the tundish; The online feeder of control shield gas flow rate is set; intermediate frequency furnace is provided with manual apparatus for pouring; casting and rolling machine also is provided with online bath temperature-detecting device and bath liquid level detection device, and casting and rolling machine is provided with automatic roll gap adjustment device, roller speed self-checking device.
6, according to the described equipment of claim 5, it is characterized in that side seal board is close to the edge of two rolls, the side seal board section configuration is an isosceles trapezoid.
7,, it is characterized in that described induction furnace is 30～double centner intermediate frequency furnace according to the described equipment of claim 5.
8, according to the described equipment of claim 5, it is characterized in that described tundish is made of outer steel plate, liner and cover plate, tundish length is 0.3m～3m, width is 0.1m～2m, highly is 0.2～1.5m; Pouring mouth, pouring mouth diameter are arranged at the tundish bottom is 2cm～50cm, and the pouring mouth link slot is positioned at a side of tundish bottom, and the cloth chute is installed in the pouring mouth bottom, and the cloth chute vertically links to each other up and down with pouring mouth, by bolting together; Protective gas nozzle and preheated fuel gas nozzle are stuck in three circular apertures of cover plate, and the cloth chute is made of outer steel plate, liner and three blocks, and liner and block bond together.
9,, it is characterized in that described casting and rolling machine for two roller horizontal casting and rolling machines, disposes the inner-cooled roll, roller diameter: Φ 300mm～2000mm, the wide 10cm～300cm of roller according to the described equipment of claim 5.
10, according to the described equipment of claim 5, it is characterized in that casting and rolling installation is provided with also that prestressing force is rolling, roll-force and preload force display unit, the subsequent handling of casting and rolling installation is furnished with hot-rolling mill, cold-rolling mill and annealing furnace, and the strip clamping and conveying device is installed in the exit of casting and rolling machine along row.
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| CNB2006101350845A CN100430161C (en) | 2006-12-27 | 2006-12-27 | Cast rolling method and equipment of isometric crystal ferrite stainless steel slab band |
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| CNB2006101350845A CN100430161C (en) | 2006-12-27 | 2006-12-27 | Cast rolling method and equipment of isometric crystal ferrite stainless steel slab band |
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| CN100430161C true CN100430161C (en) | 2008-11-05 |
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| CN101983001B (en) * | 2010-09-17 | 2013-03-27 | 襄樊世科电气有限公司 | Equipment for manufacturing stainless steel clad plates by low temperature induction heating |
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| CN101966571B (en) * | 2010-11-15 | 2012-02-29 | 南京钢铁股份有限公司 | Pouring method capable of controlling flow rate |
| CN103945958B (en) * | 2011-11-18 | 2016-01-20 | 杰富意钢铁株式会社 | The defect of the failure prediction detection method of slab, the manufacture method of slab, slab produces predicted detection device, possesses the continuous casting equipment that the defect of this slab produces predicted detection device |
| CN104138899A (en) * | 2014-06-23 | 2014-11-12 | 梧州恒声电子科技有限公司 | Control technology of hot-rolled steel plate |
| CN106424657B (en) * | 2016-09-07 | 2020-09-15 | 上海华培动力科技(集团)股份有限公司 | Pressure-regulating casting method for producing ferrous metal casting |
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| CN110331261A (en) * | 2019-08-20 | 2019-10-15 | 山西太钢不锈钢股份有限公司 | Think gauge low chrome ferritic stainless steel hot rolling curtain cover annealing method |
| CN113210436A (en) * | 2021-04-04 | 2021-08-06 | 厦门攻启贸易有限公司 | Casting and rolling machine protection device capable of adjusting thickness of cast and rolled aluminum |
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