CN101941021B - Method for producing extra-deep drawing cold-rolled steel plate based on ASP process - Google Patents
Method for producing extra-deep drawing cold-rolled steel plate based on ASP process Download PDFInfo
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Abstract
The invention discloses a method for producing an extra-deep drawing cold-rolled steel plate based on a sheet billet continuous casting and rolling process in ASP, and belongs to the technical field of rolled steel. After molten steel meeting the component requirement is obtained by adopting molten iron pretreatment, a converter, LF and RH, a hot-rolled substrate is produced by the sheet billet continuous casting and rolling process in the ASP, and the hot-rolled substrate is subjected to acid washing, cold rolling, cover annealing and leveling processes to obtain the extra-deep drawing cold-rolled steel plate. Compared with the prior art, the performance of the produced extra-deep drawing cold-rolled steel plate meets the European standard EN10130-2006, meanwhile, the production cost is reduced, energy is saved and consumption is reduced. The method broadens the variety range of products produced by a sheet billet continuous casting and rolling production line in the ASP, can meet the increasing requirements of the industries of automobiles, home appliances, buildings, transports, light industry and the like for plates, and improves the product competitiveness of enterprises.
Description
Technical field
The present invention relates to a kind of method of producing super deep-draw level cold-rolled steel sheet, particularly relate to a kind of method based on the super deep-draw level of ASP medium thin slab continuous casting and rolling explained hereafter cold-rolled steel sheet.
Background technology
The technological process of production of traditional super deep-draw level cold-rolled steel sheet is: molten steel+continuous casting+continuous casting billet heats again+and hot rolling+cold rolling+annealing+smooth, its continuous casting steel billet thickness is generally 230mm, and continuous casting steel billet needs to carry out hot rolling after heating again.The report that does not also have at present the above cold-rolled steel sheet of deep-draw level to adopt Process of Hot Transfering And Hot Charging to produce when hot rolling.Patent 200710130974.1 has been reported the method for employing CSP (CSP) explained hereafter deep-draw level cold-rolled steel sheet, its technique is: directly enter 7 frame tandem rollings after the continuous casting billet process of passing through tunnel stove short time soaking with 70mm thickness, then cold rolling through four Stands Cold Tandem Mill groups, adopt afterwards bell-type annealing.This explained hereafter efficient is high, energy-conservation, but because its thickness of strand is 70mm, compression ratio is little, and rolling board quality is relatively poor, is unsuitable for producing more high-grade cold-reduced sheet.And this production technology and unrealized industrialized mass production.
Adopt the traditional processing technology flow process to produce and the continuous casting and rolling technique of sheet bar flow process, because both thermal history (and deformation condition and process) is different, determine that its structural transformation process is different, this has also just determined same steel grade its performance characteristics difference to some extent when adopting different technological processes to produce.Typical continuous casting and rolling technique of sheet bar and the difference of traditional handicraft on flow process are as shown in Figure 1.
ASP medium thin slab continuous casting and rolling production line is the complete set technology that Chinese metallurgy industry has independent intellectual property right, it is the producing process of sheet and strip that continuous casting and rolling directly is connected, the ASP process characteristic is that thickness of strand is 135mm～150mm, realized the short flow process that middle minimal thickness sheet billet continuous casting and belt steel rolling directly are connected, had straight dress and directly roll energy-efficient outstanding feature.The ASP production technology is so far not yet for the production of deep-draw level and super deep-draw level and above rank punching press cold-rolled steel sheet.This strand also will be different from the continuous casting and rolling technique of sheet bar flow process through its structure property of hot-rolled finished product of 1 roughing mill and 6 frame finishing mill rolling production.
Summary of the invention
The object of the present invention is to provide a kind of method based on the super deep-draw level of ASP medium thin slab continuous casting and rolling Wiring technology production cold-rolled steel sheet, the method adopts ASP medium thin slab continuous casting and rolling flow process, be rolled after directly entering the soaking pit soaking after sheet billet continuous casting, shorten technological process, improved production efficiency; Owing to adopting the cooling segmentation process for cooling of laminar flow, having solved ASP technique hot-rolled substrate grain size number and the high problem of yield strength when being cold rolling feeding.
For ASP medium thin slab continuous casting and rolling flow process, the Main Differences of producing the IF steel with old process is: (1) further controls the clarity of steel by the KR Deep Desulphurization of Hot Metal; (2) smelting-sheet billet continuous casting process increases C, increases the control technology of N; (3) control technology of sheet billet continuous casting process as-cast structure; (4) furnace temp system; (5) hot rolling technology system and process for cooling system; (6) follow-up cold-rolling process system; (7) annealing process system.
For achieving the above object, a kind of method based on the super deep-draw level of ASP explained hereafter cold-rolled steel sheet provided by the invention, it is characterized in that: after adopting molten iron pretreatment+converter+LF+RH to obtain to satisfy the molten steel of composition requirement, through ASP medium thin slab continuous casting and rolling explained hereafter hot-rolled substrate, hot-rolled substrate obtains super deep-draw level cold-rolled steel sheet by pickling, cold rolling, bell-type annealing, smooth operation.
Concrete steps are as follows:
(1) molten iron pretreatment: adopt the dark desulfurization of KR method molten iron pretreatment, the rear control of skimming enters the sulfur content of stove molten iron below 0.003% (wt/wt);
(2) converter: high-purity oxygen (purity is greater than 99.5%) is adopted in converter, keep malleation in stove, aim carbon and temperature are controlled respectively 0.03～0.06% (wt/wt), 1620～1675 ℃, guarantee finishing slag basicity R=4～5, carry out the pushing off the slag tapping;
(3) the LF refining furnace carries out deoxidation slag making and temperature control, change the converter slag of hyperoxia voltinism into FeO+MnO quality percentage composition less than＜1.5% reproducibility slag, effectively isolated slag transmits the carrying out of oxygen in molten steel, and by heated by electrodes, liquid steel temperature is controlled at 1640～1680 ℃.
(4) cleanliness factor of dark decarburization, raising molten steel, form and the microalloy treatment of control field trash are carried out in the vacuum refining of RH stove, (begin circulation at molten steel by timely oxygen blast, vacuum pressure 250mbar begins oxygen blast when following), and the pressure of fast reducing vacuum chamber (in 4 minutes, vacuum chamber pressure being down to below 2mbar) make steel in carbon content descend rapidly.
(5) continuous casting: adopting thickness is the ASP continuous casting production of 135mm, and ladle roughing slag detects automatically, adopts argon gas-sealed between ladle and long nozzle, and tundish uses low-carbon (LC) alkalescence cylinder-packing+carbon-free covering agent, and crystallizer uses the low-carbon (LC) high-viscosity covering slag;
(6) soaking: above-mentioned strand directly enters soaking pit after shearing through two cooling bending straightenings, and heating and temperature control is not less than 910 ℃ at 1200～1300 ℃ to guarantee the hot continuous rolling finishing temperature;
(7) hot rolling: the strand that goes out soaking pit is rolling through entering four roller reversible roughing mills after high-pressure water descaling, and then rolling through six frame hot continuous rolling units is the hot-rolled substrate of thickness 2～5mm, and hot rolling finishing temperature is 910～950 ℃;
(8) laminar flow is cooling: thin plate is that the laminar flow cooling section of 70m batches rolling by coiling machine after cooling through length; Adopt the two sparse types of cooling of stage at the laminar flow cooling section, thereby reduce cooling velocity.After process ASP technique hot rolling and laminar flow were cooling, obtaining grain size was the ferrite crystal grain of ASTM7-9 level, thereby reduced the yield strength of hot rolled plate;
(9) pickling: enter descaling bath after the hot rolled coil uncoiling, pickling speed 50～100m/min, strip coiling after pickling, pickling winds off that to enter the compact cold strip mill group after volume cold rolling, and cold rolling overall reduction is 60～85%;
(10) annealing, smooth: chill involving in into the bell-type annealing furnace annealing, annealing temperature are 720 ℃～740 ℃, and smooth percentage elongation is 0.3%～1.0%.
Adopt ASP medium thin slab continuous casting and rolling production line+Stand Mill cold rolling+the super deep-draw level of bell-type annealing explained hereafter cold-rolled steel sheet is a kind of novel technique thinking.The present invention is by taking suitable smelting process, ASP hot rolling technology, cold-rolling process, annealing and flattening process, can adopt the super deep-draw level of the production cold-rolled steel sheet of this abbreviated system high efficiency, low cost of ASP, properties of product are higher than the requirement of European standard EN10130-2006 to super deep-draw level cold-rolled steel sheet.
According to the requirement of European standard DIN EN 10130-2006, the performance indications of ultra-deep punching cold-rolling steel sheet are: R
P0.2≤ 180MPa, 270MPa≤R
m≤ 330MPa, A
80〉=40%, plastic strain ratio r
90〉=1.9, work hardening index n
90〉=0.20.The finished steel plate mechanical property of producing with the present invention is: R
P0.2≤ 150MPa, 270MPa≤R
m≤ 330MPa, A
80〉=41%, plastic strain ratio r
90〉=2.1, work hardening index n
90〉=0.21.The mechanical property of the ultra-deep punching cold-rolling steel sheet that the present invention produces reaches the European standard requirement fully.
The present invention compared with prior art, the extra deep drawing sheet steel production cost of producing is low, energy-saving and cost-reducing.The method has been widened the product variety scope that ASP medium thin slab continuous casting and rolling production line can be produced, and can satisfy the industries such as growing automobile, household electrical appliances, building, communications and transportation and light industry to the demand of sheet material, has improved the product competitiveness of enterprise.
Description of drawings
Fig. 1 is that continuous casting and rolling technique of sheet bar and traditional handicraft are at the flow process comparison diagram.
Fig. 2 is the metallographic structure figure of embodiment 1 hot-rolled substrate.
Fig. 3 is the metallographic structure figure of embodiment 1 finished steel plate.
Fig. 4 is the metallographic structure figure of embodiment 2 hot-rolled substrates.
Fig. 5 is the metallographic structure figure of embodiment 2 finished steel plates.
The specific embodiment
Embodiment 1:
The embodiment of the present invention 1 in turn includes the following steps:
(1) molten iron pretreatment: adopt the dark desulfurization of KR method molten iron pretreatment, the rear control of skimming enters the sulfur content of stove molten iron below 0.003% (wt/wt);
Steel-making: converter adopts the converter of 120 tons, and tap is 148.61 tons, and during tapping, the percetage by weight of carbon is 0.0469%, and tapping temperature is 1644 ℃;
Converter molten steel out carries out deoxidation slag making and temperature control at the LF refining furnace, concrete technology: treatment cycle 61min, and heat time heating time, 34min, arrived 1563 ℃ of temperature, leaves 1642 ℃ of temperature, and flow 300m calms the anger
3, feed aluminum shot 120kg.
Converter molten steel is out carried out refining in the RH stove, adopt vacuum decarburization, feed aluminum steel, add the method such as ferro-titanium and adjust alloying component, the percetage by weight content (%) of the molten steel composition when refining is finished is controlled at C 0.0015, Si 0.032, Mn 0.176, P 0.011, S 0.003, Als 0.039, Ti0.075; Liquid steel temperature is 1600 ℃.
(2) continuous casting: adopting thickness is the ASP continuous casting production of 135mm, and ladle roughing slag detects automatically, adopts the Ar sealing between ladle and long nozzle, and tundish uses low-carbon (LC) alkalescence cylinder-packing+carbon-free covering agent, and crystallizer uses the low-carbon (LC) high-viscosity covering slag.Concrete continuous casting process:
1. the bag thermometric time in: bag thermometric temperature in 2010-05-05 00:35:41: 1558 ℃; Casting machine speed 2.5m/min; 2. the bag thermometric time in: bag thermometric temperature in 2010-05-05 00:41:46: 1558 ℃; Casting machine speed 2.5m/min; 3. the bag thermometric time in: bag thermometric temperature in 2010-05-05 00:49:52: 1561 ℃; Casting machine speed 2.5m/min; 4. the bag thermometric time in: bag thermometric temperature in 2010-05-05 00:57:59: 1562 ℃; Casting machine speed 2.5m/min; 5. the bag thermometric time in: bag thermometric temperature in 2010-05-05 01:05:05: 1559 ℃; Casting machine speed 2.5m/min; 6. the bag thermometric time in: bag thermometric temperature in 2010-05-05 01:13:11: 1557 ℃; Casting machine speed 2.5m/min.
(3) soaking: above-mentioned strand directly enters soaking pit after shearing through two cooling bending straightenings, heating and temperature control is at 1200～1300 ℃, to guarantee that the hot continuous rolling finishing temperature is not less than 910 ℃, concrete uniform heating process: bringing-up section top: 1280 ℃, bringing-up section bottom: 1265 ℃; Soaking zone top: 1270 ℃, soaking zone bottom: 1240 ℃; 95 minutes heating of plate blank time.
(4) hot rolling: the strand that goes out soaking pit is the thick intermediate blank of 34mm through entering four roller reversible roughing mills after high-pressure water descaling rolling, and then rolling through six frame hot continuous rolling units is the hot-rolled substrate of thickness 4.0mm, and hot rolling finishing temperature is 930 ℃.Concrete hot rolling technology:
(5) laminar flow is cooling: thin plate is that the laminar flow cooling section of 70m batches rolling by coiling machine after cooling through length.Adopt the two sparse types of cooling of stage at the laminar flow cooling section, thereby reduce cooling velocity.After process ASP technique hot rolling and laminar flow were cooling, obtaining grain size was the ferrite crystal grain of ASTM8 level, thereby reduced the yield strength of hot rolled plate.Concrete laminar flow cooling technology: two sections refrigerating modes: 2nd, 3,9,10,11 groups of upper headers first three arrange, rear three rows are closed, the lower collector pipe standard-sized sheet.
(6) pickling, cold rolling: enter descaling bath after the hot rolled coil uncoiling, pickling speed 85m/min, strip coiling after pickling.Pickling winds off that to enter the compact cold strip mill group after volume cold rolling, and cold rolling overall reduction is 60-85%.Concrete acid cleaning process:
Acid liquor temperature is controlled: 85 ℃, 3# acid tank, 80 ℃, 2# acid tank, 78 ℃, 1# acid tank, departure ± 2 ℃.3# acid tank free acid concentration 170g/L, Fe
2+Concentration 45g/l.
Cold-rolling process: adopt the texturing working roll rolling, roughness 2.2 μ m; Emulsion saponification number 175mg, 55 ℃ of emulsion temperature, concentration 4.3% (wt/wt); Cold rolling reduction ratio 75%.
(7) annealing, smooth: chill involving in into the bell-type annealing furnace annealing, annealing temperature are 720 ℃～740 ℃, and smooth percentage elongation is 0.3%～1.0%.Concrete annealing flattening process:
Annealing process: hydrogen purity＞99%; 722 ℃ of cold-point temperatures, 739 ℃ of hot(test)-spot temperatures.
Flattening process: percentage elongation 0.4%; Planisher uncoiling tension 20; Planisher entrance tension force 42; Planisher coiling tension 48; The smooth oil mass 800mg/m that is coated with
2
The width of the finished product volume of the ASP production line of the present embodiment is 1000mm, and volume weighs 14.73 tons.The chemical composition of the super deep-draw level cold-rolled steel sheet that the present embodiment is produced and mechanical property are respectively as shown in Table 1 and Table 2.The metallographic structure of hot-rolled substrate and finished steel plate respectively as shown in Figures 2 and 3.
Table 1 surpasses the chemical composition (wt%) of deep-draw level cold-rolled steel sheet
| C | Si | Mn | P | S | Als | Ti |
| 0.0025 | 0.03 | 0.18 | 0.012 | 0.004 | 0.030 | 0.069 |
Table 2 surpasses the mechanical property of deep-draw level cold-rolled steel sheet
| R p0.2 | R m | A 80(％) | r 90 | n 90 |
| 139 | 290 | 44.5 | 2.50 | 0.235 |
Embodiment 2:
The embodiment of the present invention 2 in turn includes the following steps:
(1) molten iron pretreatment: adopt the dark desulfurization of KR method molten iron pretreatment, the rear control of skimming enters the sulfur content of stove molten iron below 0.003% (wt/wt);
Steel-making: converter adopts the converter of 120 tons, and tap is 144.5 tons, and during tapping, the percetage by weight of carbon is 0.0497%, and tapping temperature is 1631 ℃;
Converter molten steel out carries out deoxidation slag making and temperature control at the LF refining furnace, concrete technology: treatment cycle 52min, and heat time heating time, 24min, arrived 1554 ℃ of temperature, leaves 1648 ℃ of temperature, and flow 100m calms the anger
3, feed aluminum shot 110kg.
Converter molten steel is out carried out refining in the RH stove, adopt vacuum decarburization, feed aluminum steel, add the method such as ferro-titanium and adjust alloying component, the percetage by weight content (%) of the molten steel composition when refining is finished is controlled at C 0.0010, Si 0.026, Mn 0.169, P 0.013, S 0.003, Als0.051, Ti0.075; Liquid steel temperature is 1590 ℃.
(2) continuous casting: adopting thickness is the ASP continuous casting production of 135mm, and ladle roughing slag detects automatically, adopts the Ar sealing between ladle and long nozzle, and tundish uses low-carbon (LC) alkalescence cylinder-packing+carbon-free covering agent, and crystallizer uses the low-carbon (LC) high-viscosity covering slag.Concrete continuous casting process:
1. the bag thermometric time in: bag thermometric temperature in 2010-05-20 00:16:15: 1566 ℃; Casting machine speed 2.2m/min; 2. the bag thermometric time in: bag thermometric temperature in 2010-05-20 00:22:18: 1570 ℃; Casting machine speed 2.2m/min; 3. the bag thermometric time in: bag thermometric temperature in 2010-05-20 00:28:16: 1571 ℃; Casting machine speed 2.2m/min; 4. the bag thermometric time in: bag thermometric temperature in 2010-05-20 00:34:19: 1571 ℃; Casting machine speed 2.2m/min; 5. the bag thermometric time in: bag thermometric temperature in 2010-05-20 00:40:21: 1568 ℃; Casting machine speed 2.2m/min; 6. the bag thermometric time in: bag thermometric temperature in 2010-05-20 00:46:20: 1567 ℃; Casting machine speed 2.2m/min.
(3) soaking: above-mentioned strand directly enters soaking pit after shearing through two cooling bending straightenings, and heating and temperature control is not less than 910 ℃ more than 1200 ℃ to guarantee the hot continuous rolling finishing temperature.Concrete heating process:
Bringing-up section top: 1290 ℃, bringing-up section bottom: 1265 ℃; Soaking zone top: 1275 ℃, soaking zone bottom: 1245 ℃; 85 minutes heating of plate blank time.
(4) hot rolling: the strand that goes out soaking pit is the thick intermediate blank of 34.2mm through entering four roller reversible roughing mills after high-pressure water descaling rolling, and then rolling through six frame hot continuous rolling units is the hot-rolled substrate of thickness 4.0mm, and hot rolling finishing temperature is 930 ℃.Concrete hot rolling technology:
(5) laminar flow is cooling: thin plate is that the laminar flow cooling section of 70m batches rolling by coiling machine after cooling through length.Adopt the two sparse types of cooling of stage at the laminar flow cooling section, thereby reduce cooling velocity.After process ASP technique hot rolling and laminar flow were cooling, obtaining grain size was the ferrite crystal grain of ASTM8 level, thereby reduced the yield strength of hot rolled plate.Concrete laminar flow cooling technology:
Two sections refrigerating modes: 2nd, 3,9,10,11 groups of upper headers first three arrange, rear three rows are closed, the lower collector pipe standard-sized sheet.
(6) pickling, cold rolling: enter descaling bath after the hot rolled coil uncoiling, pickling speed 80m/min, strip coiling after pickling.Pickling winds off that to enter the compact cold strip mill group after volume cold rolling, and cold rolling overall reduction is 60～85%; Concrete pickling cold-rolling process:
Acid cleaning process: acid liquor temperature is controlled: 85 ℃, 3# acid tank, 80 ℃, 2# acid tank, 78 ℃, 1# acid tank, departure ± 2 ℃.3# acid tank free acid concentration 160g/L, Fe
2+Concentration 55g/l.
Cold-rolling process: adopt the texturing working roll rolling, roughness 2.1 μ m; Emulsion saponification number 170mg, 55 ℃ of emulsion temperature, concentration 4.3% (wt/wt); Cold rolling reduction ratio 80%.
(7) annealing, smooth: chill involving in into the bell-type annealing furnace annealing, annealing temperature are 720 ℃～740 ℃, and smooth percentage elongation is 0.3%～1.0%.Concrete annealing flattening process:
Annealing process: hydrogen purity＞99%; 718 ℃ of cold-point temperatures, 741 ℃ of hot(test)-spot temperatures.
Flattening process: percentage elongation 0.43%; Planisher uncoiling tension 21; Planisher entrance tension force 40; Planisher coiling tension 48; The smooth oil mass 1000mg/m that is coated with
2
The width of the finished product volume of the ASP production line of the present embodiment is 1220mm, and volume weighs 16.545 tons.The chemical composition of the super deep-draw level cold-rolled steel sheet that the present embodiment is produced and mechanical property are respectively as shown in table 3 and table 4.The metallographic structure of hot-rolled substrate and finished steel plate respectively as shown in Figure 4 and Figure 5.
Table 3 surpasses the chemical composition (wt%) of deep-draw level cold-rolled steel sheet
| C | Si | Mn | P | S | Als | Ti |
| 0.0023 | 0.03 | 0.17 | 0.013 | 0.006 | 0.038 | 0.072 |
Table 4 surpasses the mechanical property of deep-draw level cold-rolled steel sheet
| R p0.2 | R m | A 80 | r 90 | n 90 |
| 137 | 295 | 43.5 | 2.70 | 0.230 |
Claims (3)
1. method based on the super deep-draw level of ASP explained hereafter cold-rolled steel sheet, it is characterized in that, after adopting molten iron pretreatment+converter+LF+RH to obtain to satisfy the molten steel of composition requirement, through ASP medium thin slab continuous casting and rolling explained hereafter hot-rolled substrate, hot-rolled substrate obtains super deep-draw level cold-rolled steel sheet by pickling, cold rolling, bell-type annealing, smooth operation; Comprise the following steps:
(1) molten iron pretreatment: adopt the dark desulfurization of KR method molten iron pretreatment, the rear control of skimming enters the sulfur content of stove molten iron at 0.003%(wt/wt) below;
(2) converter: converter adopts purity greater than 99.5% high-purity oxygen, keeps malleation in stove, and aim carbon and temperature are controlled respectively 0.03～0.06%(wt/wt), 1620～1675 ℃, guarantees finishing slag basicity R=4～5, carries out the pushing off the slag tapping;
(3) the LF refining furnace carries out deoxidation slag making and temperature control; It is that converter slag with the hyperoxia voltinism changes FeO+MnO quality percentage composition into less than 1.5% reproducibility slag that described LF refining furnace carries out that deoxidation slag making and temperature control, effectively isolated slag transmits the carrying out of oxygen in molten steel, and by heated by electrodes, liquid steel temperature is controlled at 1640～1680 ℃;
(4) cleanliness factor of dark decarburization, raising molten steel, form and the microalloy treatment of control field trash are carried out in the vacuum refining of RH stove;
(5) continuous casting: adopting thickness is the ASP continuous casting production of 135mm, and ladle roughing slag detects automatically, adopts argon gas-sealed between ladle and long nozzle, and tundish uses low-carbon (LC) alkalescence cylinder-packing+carbon-free covering agent, and crystallizer uses the low-carbon (LC) high-viscosity covering slag;
(6) soaking: above-mentioned strand directly enters soaking pit after shearing through two cooling bending straightenings, and heating and temperature control is not less than 910 ℃ at 1200～1300 ℃ to guarantee the hot continuous rolling finishing temperature;
(7) hot rolling: the strand that goes out soaking pit is rolling through entering four roller reversible roughing mills after high-pressure water descaling, and then rolling through six frame hot continuous rolling units is the hot-rolled substrate of thickness 2～5mm, and hot rolling finishing temperature is 910～950 ℃;
(8) laminar flow is cooling: thin plate is that the laminar flow cooling section of 70m batches rolling by coiling machine after cooling through length, and described step (8) adopts the two sparse types of cooling of stage at the laminar flow cooling section, thereby reduces cooling velocity;
(9) pickling: enter descaling bath after the hot rolled coil uncoiling, pickling speed 50～100m/min, strip coiling after pickling, pickling winds off that to enter the compact cold strip mill group after volume cold rolling, and cold rolling overall reduction is 60～85%;
(10) annealing, smooth: chill involving in into the bell-type annealing furnace annealing, annealing temperature are 720 ℃～740 ℃, and smooth percentage elongation is 0.3%～1.0 %.
2. a kind of method based on the super deep-draw level of ASP explained hereafter cold-rolled steel sheet as claimed in claim 1, is characterized in that, described step (4) is by timely oxygen blast, and the pressure of fast reducing vacuum chamber makes, and in steel, carbon content descends rapidly.
3. a kind of method based on the super deep-draw level of ASP explained hereafter cold-rolled steel sheet as claimed in claim 1 or 2, it is characterized in that, after process ASP technique hot rolling and laminar flow were cooling, obtaining grain size was the ferrite crystal grain of ASTM7-9 level, thereby reduced the yield strength of hot rolled plate.
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| US5286315A (en) * | 1989-03-30 | 1994-02-15 | Nippon Steel Corporation | Process for preparing rollable metal sheet from quenched solidified thin cast sheet as starting material |
| CN1071959A (en) * | 1992-09-08 | 1993-05-12 | 北京科技大学 | Produce the method for extra-deep drawing sheet steel by the texture pre-treatment |
| CN1300865A (en) * | 2000-11-27 | 2001-06-27 | 宝山钢铁股份有限公司 | Technology for smelting high-quality mandrel steel |
| CN101144113A (en) * | 2007-08-20 | 2008-03-19 | 马鞍山钢铁股份有限公司 | Technique for producing deep-drawing cold-rolled plate based on CSP technique |
| CN101215618A (en) * | 2007-12-27 | 2008-07-09 | 本钢板材股份有限公司 | Method for smelting ultra-low-carbon steel |
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