CN1173048C - Method and installation for producing dual-phase steel - Google Patents
Method and installation for producing dual-phase steel Download PDFInfo
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- CN1173048C CN1173048C CNB998091405A CN99809140A CN1173048C CN 1173048 C CN1173048 C CN 1173048C CN B998091405 A CNB998091405 A CN B998091405A CN 99809140 A CN99809140 A CN 99809140A CN 1173048 C CN1173048 C CN 1173048C
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- cooling
- ferrite
- section
- cooled
- steel
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- Expired - Lifetime
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- 229910000885 Dual-phase steel Inorganic materials 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 26
- 238000009434 installation Methods 0.000 title description 2
- 238000001816 cooling Methods 0.000 claims abstract description 132
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 47
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 3
- 230000009466 transformation Effects 0.000 claims description 19
- 229910001566 austenite Inorganic materials 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 description 6
- 230000007704 transition Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The invention relates to the production of dual-phase steel (2) which is obtained by targeted cooling after the final deformation step in a rolling stand (1), whereby a dual-phase structure of between 70 and 90% ferrite and between 30 and 10% martensite is adjusted. So as to be independent of steel geometry and strip speed the invention provides for cooling to take the form of fluidized-bed cooling carried out in a cooling line (6) comprising water-cooling stages (7) arranged one behind the other.
Description
Technical field
The present invention relates to a kind of hot rolling attitude steel that contains 70 to 90% ferrites and 30 to 10% martensite two-phase structures certainly and make the method for dual-phase steel and used device, wherein cooling curve enters the ferrite zone in first cooling section, and after reaching the ferrite part of necessity, in second cooling section, continue to be cooled to below the martensite start temperature.
Background technology
Suitably cool off steel and on purpose make structural transformation, this is on record.Therefore, for instance, narrated a kind of method of making broad hot strip among DE44 16 752 A1, before wherein being out of shape first between continuous caster and hot metal mixer, enough the surface temperature of thick (2mm at least) slab drops to and can regulate austenite structure to ferrite/perlitic transformation.In the case, will select cooling time to make at least 70% austenitic transformation to become ferrite/perlite.In hot metal mixer, change into austenite immediately again, simultaneously the austenite grain boundary reorientation.Should realize that in this way iron and steel scrap, especially cupric iron and steel scrap that secondary is selected also can be used as starting materials, and can not make copper that the gathering that does not expect to have takes place on primary austenite grain boundary.
When making dual-phase steel, people utilize the structural transformation of carrying out by the cooling of being undertaken by purpose equally, but have been on the time after the distortion of being carried out.In the case, the adjustment of two-phase structure depends primarily on the speed of cooling reached on the equipment and technology and the composition of steel.When making dual-phase steel, importantly the ferrite that forms in first cooling section wants enough.
The technical consideration of slave unit, for instance, first water-cooled is to about 620～650 degrees centigrade temperature, and air cooling more just can form the ferrite of sufficient amount.The air cooling time length (about 8 seconds) will be selected to such an extent that can have at least 70% austenitic transformation to become ferrite before second cooling section begins.In first cooling section, and in Air-cooling Process, should avoid being transformed into the perlite degree.
In second cooling section, refrigeration capacity must more than can make coiling temperature be lower than martensite start temperature.Have only such two-phase structure that could guarantee to form with ferrite composition and martensite composition.This already known processes be out of question for ... low band travelling speed because after first cooling section finishes, also has enough refrigeration capacities to use for martensitic transformation.
When the band travelling speed is very high, it is initial certainly to postpone second cooling section in the cooling section that is just carrying out, carry out not exclusively so that the martensite of following forms, perhaps do not carry out, this is because refrigerating duty no longer is enough to be used for adjusting required low temperature (＜220 degrees centigrade).Then, form a kind of polyphase structure of being made up of ferrite, bainite and martensite part, this polyphase structure is not realized the mechanical characteristics that is reached of simple two-phase structure.
Disclose a kind of manufacture method of hot-rolled steel sheet by EP-A-0747495, its tissue comprises at least 75% ferrite and at least 10% martensite.For this reason, steel plate is autotelic the cooling after hot rolling, and is that 8～40 second internal cooling to Ar with the speed of cooling of 2～15 ℃ of per seconds in the timed interval at first cooling stages
1Point and the temperature between 730 ℃ are cooled to 300 ℃ at second cooling stages with the speed of cooling of 20～150 ℃ of per seconds then.Another program is that the speed of cooling that first cooling stages is enough to 20～150 ℃ of per seconds is cooled to temperature Ar
3Below the point.
Disclose a kind of manufacture method of hot-rolled steel sheet by the summary of Japanese Patent JP57104650A, this steel plate comprises the martensite of ferrite and 1～30%.This method is realized by two stage cooling equally.In this known method, at first the speed of cooling with 5～30 ℃ of per seconds slowly is cooled to Ar
1Point and the temperature between 550 ℃ then are cooled to 350～500 ℃ of temperature ranges at second cooling stages with the speed of cooling greater than the piece of 30 ℃ of per seconds.
Summary of the invention
With this known systems is starting point, the objective of the invention is to propose a kind of method and apparatus that is used for making dual-phase steel, with this method and device,, also can make austenite also quantitatively be transformed into ferrite fast fully even under the high situation of belt speed.
The goal of the invention that proposes above, with regard to manufacture method, its technical solution is a kind ofly have method by the dual-phase steel of 70 to 90% ferrites and 30 to 10% martensite two-phase structures from the manufacturing of hot rolling attitude, wherein decided cooling strategy steel is carried out refrigerative while with controllable temperature system and institute, also by the water-cooled that steel after the finish rolling is carried out, wherein in first cooling section, make cooling curve enter ferrite zone and in second cooling section, continue to be cooled to below the martensite start temperature with higher speed of cooling with low speed of cooling, wherein, in the cooling section that the water cooling section that is provided with at interval by front and back is formed, speed of cooling by 20～30K/s is carried out first cooling stages with regulating, so that cooling curve enters the ferrite zone with still very high temperature, make ferrite to form fast, and air cooling and the residence time are set and before and then second cooling section of first cooling section begins in the middle of do not have, at least also have 70% austenitic transformation to become ferrite, and be transformed into ferrite at austenite, when the ferrite content of being made every effort to reaches 70% at least, proceed the cooling of first cooling stages.
Because the present invention adopts the speed of cooling slow type of cooling lower than currently known methods, so from the time, it is more late that cooling curve arrives the ferrite zone, but the temperature when arriving ferrite area is than currently known methods height, that is to say that austenite has begun to the time retardation of ferritic transformation some, but the temperature that begins to change is than currently known methods height, and based on higher temperature, the also very fast extension of curve is gone over.If under the simultaneously also high situation of invert point, arrive the ferrite zone as early as possible, then can produce good result.
Compare with currently known methods, the present invention can produce at least 70% transformation degree so early, thereby refrigerating duty also enough is used for follow-up martensite formation in given cooling section.That is to say that after first cooling section finished, the capacity austenitic transformation became ferrite, thereby can cancel air cooling commonly used under other situations, and can directly connect second cooling section by first cooling section.
For cooling is carried out with required low speed of cooling, the present invention has used also cooling principle of fluidized-bed.This is a kind of water-cooling method, and wherein a plurality of water-cooled Duan Yiyi determining deviations priorities are Boulez successively, therefrom water is watered and drenches on the cooled object.Total progression to the water-cooled section is exerted one's influence, and just can make speed of cooling or the each interval between cooled object waters the water yield (surface-area of the quality of its cooled object and/or the described material that is cooled) of pouring optimal adaptation is at different levels and the useful length of water-cooled section.Described cooling also can realize with a kind of stepless variable amount of coolant.
Owing to adapted to cooled object, fluidized-bed just also cools off and can prolong so for a long time in time, until obtain till the desirable transformation degree, has cooling curve and too acutely just left the ferrite zone because of cooling in advance unlike currently known methods.
Compare with cooling of the prior art, under the situation of fluidized-bed cooling or amount of coolant stepless variable, water the pouring less water and just can reach described transition temperature.Therefore for the carbonaceous material mixture of accelerating to separate out in the ferrite enters the process of retained austenite and promotes ferrite to form, it is poor just in time to replenish this water yield in transition process.The restorative austenite region has been transformed into martensite with carbon enrichment when speed of cooling is 20～30K/s.
Cool off in view of no longer include the necessary certain hour that stops in air, for guaranteeing that ferrite fully forms, the part of available cooling section is made dual-phase steel.In the case, the used that part of ratio of cooling section adopts air cooled currently known methods much shorter.
If needed dual-phase steel structural constituent need not can be regulated in air cooling, then thus operator are produced remarkable superiority.Make the used equipment of dual-phase steel, having only seldom, portion, assembly are essential.Simultaneously, along with the variation of processing parameter and band parameter (for example higher belt speed), produce diversified degree and enlarged than before.
The goal of the invention that proposes above, with regard to manufacturing installation, technical solution is a kind of device that hot rolling attitude dual-phase steel is used that is used to make, wherein, after final finishing stand a cooling section is set, this cooling section is set up the water-cooled section that settle successively at interval a plurality of front and back.
According to the present invention, water-cooled section sum, its useful length and spacing distance thereof are variable each other, change and different band travelling speed thereby this cooling section can plain mode adapts to the geometrical shape of cooled object.
Laid down a definition by the embodiment that illustrates of diagram in the following accompanying drawing and can be learnt other advantage of the present invention, detail and technical characterictic.
Description of drawings
Fig. 1 illustrates to describe quickly cooling device and fluidized-bed refrigerating unit and the Boulez situation in roll train thereof,
Fig. 2 time-temperature transition synoptic diagram,
Austenitic transformation degree during Fig. 3 fast transition,
Austenitic transformation degree during the cooling of Fig. 4 fluidized-bed.
Embodiment
Diagram is shown and is understood the roll train end among Fig. 1, it by last finishing stand (1), treat rolled material or material to be cooled (2) and set up guide roller or the volume machine of getting (3) of driving member (4) is formed.Roll train this part above be drawn into two kinds of different cooling sections.Adopt cooling section described in the prior art (5) to cause the cooling fast too early of material to be cooled (2) owing to relevant feedwater.By the present invention's regulation, in the cooling section (6), water-cooled section (7) is settled successively with determining deviation front and back, makes with this and cools off become " easily (aufgelockert) ".
Illustrative has been repeated different process of cooling (5,6) and has been produced the different results of transformation in the following graphic extension.
Among Fig. 2, the trend of the cooling curve (10) when understanding that with time-temperature-change-illustrate cooling curve (9) when cooling off by currently known methods and fluidized-bed cool off, wherein stipulate X-coordinate represent time (Z), unit for second, ordinate zou represent temperature (T), unit for degree centigrade.
Cooling curve (9) shows the curve trend of understanding when adopting countermeasure at present commonly used (accelerate ahead of time to be cooled to certain critical temperature, carry out air cooling immediately, be cooled to be lower than the low temperature of martensite start temperature afterwards again).The ferrite that first cooling section (11) of cooling curve arrives on the site (8) relatively ahead of time forms limited proportionality (ferrite zone), and since the air cooling hold-time (12) also quite grow and in this zone (F), remain unchanged, passing second cooling section (13) arrival site (17) before, (implication of alphabetic flag is among the figure: M=martensite to continue to be cooled to be lower than the temperature of martensite start temperature, the B=bainite, the P=perlite).
Relative therewith, first cooling section (14) of cooling curve (10) carries out fluidized-bed cooling, and its arrives the ferrite zone (F) on site (15), than cooling curve (9) just late.Owing to after arriving ferrite zone (F), keep the fluidized-bed cooling earlier, do not need the time-consuming air cooling residence time, and cooling curve (10) leaves ferrite zone (F) again ahead of time from the time.
In the case, in ferrite zone (F), keep the fluidized-bed cooling for a long time, until obtain till the desirable transformation degree.Thereafter, directly use second cooling section (16) directly to continue cooling.
With the various cooling general plans of illustrating above, known quick cooling and fluidized-bed cooling, the austenitic transformation speed that can reach can learn that both are the most approaching in the describing of Fig. 3 and Fig. 4; Among the figure, each represents that with ordinate austenitic transformation becomes ferritic transformation degree (U) to represent cooling time (second) (is unit with the second) on the abscissa.
When cooling off fast (Fig. 3), in first cooling section (11) of cooling curve (9), at first form ferrite in a large number, with tapping in the capable Air-cooling Process (12), bring up to about 62% then until approximately form till 53%.Yet with regard to making dual-phase steel, this not enough.
In contrast, press shown in the cooling curve (10), when carrying out the fluidized-bed cooling (Fig. 4), in the same time, formed obviously higher ferrite content in first cooling section (14), and before second cooling section (16) beginning, 82% left and right sides austenite has changed into ferrite (ferrite generally＞80% in the present dual-phase steel of making).
The present invention is not limited to the exemplary cooling curve that the detailed Description Of The Invention part is put down in writing in the specification sheets, and other cooling curves also can adopt, for example in the refrigerating unit that causes the higher amount of coolant stepless variable of transition temperature.The present invention also is not limited to water-chilling plant, but causes arriving ahead of time other refrigerating units in ferrite zone can use high temperature the time.
Claims (3)
1. by having the method for making dual-phase steel by the hot rolling attitude steel of 70 to 90% ferrites and 30 to 10% martensite two-phase structures, wherein decided cooling strategy steel is carried out refrigerative while with controllable temperature system and institute, also by the water-cooled that steel after the finish rolling is carried out, wherein in first cooling section, make cooling curve enter ferrite zone and in second cooling section, continue to be cooled to below the martensite start temperature with higher speed of cooling with low speed of cooling, it is characterized in that, in the cooling section that the water cooling section (7) that is provided with at interval by front and back is formed, speed of cooling by 20～30K/s is carried out first cooling stages (14) with regulating
A) so that cooling curve (10) enters the ferrite zone with still very high temperature, make ferrite to form fast, and
B) air cooling and the residence time are set and and then before the beginning of second cooling section (16) of first cooling section (14) in the middle of do not have, at least also have 70% austenitic transformation to become ferrite, and be transformed into ferrite at austenite, when the ferrite content of being made every effort to reaches 70% at least, proceed the cooling of first cooling stages.
2. implement method according to claim 1 be used to make the device that hot rolling attitude dual-phase steel is used, it is characterized in that at final finishing stand (1) cooling section (6) is set afterwards, this cooling section (6) is set up the water-cooled section (7) that settle successively at interval a plurality of front and back.
3. the described device of claim 2 is characterized in that, the progression of described water-cooled section (7), its useful length and distance thereof can change each other, and be perhaps stepless adjustable under the situation of Flow-rate adjustment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833321.8 | 1998-07-24 | ||
| DE19833321A DE19833321A1 (en) | 1998-07-24 | 1998-07-24 | Method and installation to produce dual phase steels out of hot-rolled strip, with cooling rate at first cooling stage set sufficiently low to obtain temperature which is sufficiently high for rapid transformation of austenite into ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1311826A CN1311826A (en) | 2001-09-05 |
| CN1173048C true CN1173048C (en) | 2004-10-27 |
Family
ID=7875154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB998091405A Expired - Lifetime CN1173048C (en) | 1998-07-24 | 1999-07-17 | Method and installation for producing dual-phase steel |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP1108072B1 (en) |
| JP (1) | JP2002521562A (en) |
| KR (1) | KR100578823B1 (en) |
| CN (1) | CN1173048C (en) |
| AT (1) | ATE224959T1 (en) |
| BR (1) | BR9912310A (en) |
| CA (1) | CA2338743C (en) |
| DE (2) | DE19833321A1 (en) |
| MY (1) | MY124339A (en) |
| RU (1) | RU2225453C2 (en) |
| WO (1) | WO2000005422A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1013359A3 (en) | 2000-03-22 | 2001-12-04 | Centre Rech Metallurgique | Method for manufacturing a multi-band steel hot rolled. |
| NL1016042C2 (en) * | 2000-08-29 | 2001-07-24 | Corus Technology B V | Hot rolled dual phase steel band for, e.g., automotive parts contains vanadium in place of chromium |
| AUPR048000A0 (en) * | 2000-09-29 | 2000-10-26 | Bhp Steel (Jla) Pty Limited | A method of producing steel |
| KR100516519B1 (en) * | 2001-12-26 | 2005-09-26 | 주식회사 포스코 | A method for manufacturing the dual phase carbon steel wire by using controlled rolling and rapid cooling |
| KR100521596B1 (en) * | 2002-11-20 | 2005-10-12 | 현대자동차주식회사 | Processing method of automotive parts by direct resistance heating |
| DE10327383C5 (en) * | 2003-06-18 | 2013-10-17 | Aceria Compacta De Bizkaia S.A. | Plant for the production of hot strip with dual phase structure |
| CN104001742A (en) * | 2014-05-21 | 2014-08-27 | 中冶南方工程技术有限公司 | Method for achieving controlled cooling on rolled pieces between and after bar finishing mill units |
| CN104384207A (en) * | 2014-10-22 | 2015-03-04 | 南京钢铁股份有限公司 | Cooling control method for hot rolling bearing steel bar and process arrangement of hot rolling bearing steel bar |
| KR102440768B1 (en) * | 2020-12-18 | 2022-09-08 | 주식회사 포스코 | Method and apparatus for manufacturng thick-sheet iron |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5818970B2 (en) * | 1978-08-31 | 1983-04-15 | 川崎製鉄株式会社 | Method for manufacturing high-strength thin steel sheets with excellent cold workability |
| US4388122A (en) * | 1980-08-11 | 1983-06-14 | Kabushiki Kaisha Kobe Seiko Sho | Method of making high strength hot rolled steel sheet having excellent flash butt weldability, fatigue characteristic and formability |
| JPS57104650A (en) * | 1980-12-19 | 1982-06-29 | Kobe Steel Ltd | High-strength hot-rolled steel plate and its manufacture |
| JPS57137426A (en) * | 1981-02-20 | 1982-08-25 | Kawasaki Steel Corp | Production of low yield ratio, high tensile hot rolled steel plate by mixed structure |
| JPS57137452A (en) * | 1981-02-20 | 1982-08-25 | Kawasaki Steel Corp | Hot rolled high tensile steel plate having composite structure and its manufacture |
| JPS61170518A (en) * | 1985-01-25 | 1986-08-01 | Kobe Steel Ltd | Production of high-strength hot rolled steel sheet having excellent formability |
| JPS6293006A (en) * | 1985-10-18 | 1987-04-28 | Kobe Steel Ltd | Production of high strength hot rolled steel sheet |
| JP3039842B2 (en) * | 1994-12-26 | 2000-05-08 | 川崎製鉄株式会社 | Hot-rolled and cold-rolled steel sheets for automobiles having excellent impact resistance and methods for producing them |
| FR2735148B1 (en) * | 1995-06-08 | 1997-07-11 | Lorraine Laminage | HIGH-STRENGTH, HIGH-STRENGTH HOT-ROLLED STEEL SHEET CONTAINING NIOBIUM, AND METHODS OF MAKING SAME. |
| KR100301994B1 (en) * | 1996-12-24 | 2001-11-22 | 이구택 | Method for uniformly cooling hot rolled wire rod |
| KR100747495B1 (en) * | 2006-11-10 | 2007-08-08 | 삼성전자주식회사 | Variable capacity rotary compressor |
-
1998
- 1998-07-24 DE DE19833321A patent/DE19833321A1/en not_active Withdrawn
-
1999
- 1999-07-07 MY MYPI99002855A patent/MY124339A/en unknown
- 1999-07-17 DE DE59902877T patent/DE59902877D1/en not_active Expired - Lifetime
- 1999-07-17 CN CNB998091405A patent/CN1173048C/en not_active Expired - Lifetime
- 1999-07-17 CA CA2338743A patent/CA2338743C/en not_active Expired - Lifetime
- 1999-07-17 BR BR9912310-0A patent/BR9912310A/en not_active IP Right Cessation
- 1999-07-17 RU RU2001105194/02A patent/RU2225453C2/en active
- 1999-07-17 KR KR1020017000810A patent/KR100578823B1/en active IP Right Grant
- 1999-07-17 WO PCT/EP1999/005113 patent/WO2000005422A1/en active IP Right Grant
- 1999-07-17 EP EP99938282A patent/EP1108072B1/en not_active Expired - Lifetime
- 1999-07-17 AT AT99938282T patent/ATE224959T1/en not_active IP Right Cessation
- 1999-07-17 JP JP2000561368A patent/JP2002521562A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002521562A (en) | 2002-07-16 |
| DE19833321A1 (en) | 2000-01-27 |
| CA2338743A1 (en) | 2000-02-03 |
| MY124339A (en) | 2006-06-30 |
| KR20010071978A (en) | 2001-07-31 |
| CA2338743C (en) | 2010-03-30 |
| ATE224959T1 (en) | 2002-10-15 |
| DE59902877D1 (en) | 2002-10-31 |
| EP1108072B1 (en) | 2002-09-25 |
| RU2225453C2 (en) | 2004-03-10 |
| BR9912310A (en) | 2004-08-31 |
| WO2000005422A1 (en) | 2000-02-03 |
| CN1311826A (en) | 2001-09-05 |
| KR100578823B1 (en) | 2006-05-11 |
| EP1108072A1 (en) | 2001-06-20 |
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