EP1108072A1 - Procede et installation pour produire des aciers a deux phases - Google Patents
Procede et installation pour produire des aciers a deux phasesInfo
- Publication number
- EP1108072A1 EP1108072A1 EP99938282A EP99938282A EP1108072A1 EP 1108072 A1 EP1108072 A1 EP 1108072A1 EP 99938282 A EP99938282 A EP 99938282A EP 99938282 A EP99938282 A EP 99938282A EP 1108072 A1 EP1108072 A1 EP 1108072A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooling
- ferrite
- stage
- dual
- steels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 22
- 238000009434 installation Methods 0.000 title claims 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 title abstract 2
- 238000001816 cooling Methods 0.000 claims abstract description 151
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 229910001566 austenite Inorganic materials 0.000 claims description 16
- 239000002826 coolant Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 description 8
- 230000009466 transformation Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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
Definitions
- the invention relates to a method and a plant for the production of dual-phase steels from the hot-rolled state with a two-phase structure made of 70 to 90% ferrite and 30 to 10% martensite through a controlled temperature control and defined cooling strategy during the cooling of the steels, inter alia by means of Water cooling after its finish rolling, the cooling curve running into the ferrite area in a first cooling stage and further cooling to temperatures below the martensite starting temperature in a second cooling stage after reaching the necessary proportion
- the targeted microstructure conversion by appropriate cooling of the steel is known.
- DE 44 16 752 AI describes a process for producing hot wide strip, in which the surface temperature of the slab is sufficiently deep (at least before the first forming between the continuous casting machine and a compensating furnace) 2 mm) to the extent that a structural change from austenite to Fernt / Perlite occurs.
- the cooling time is selected so that at least 70% austenite is converted to Fernt / Perlite.
- the compensating furnace there is then a renewed conversion to Austenite with reorientation of Austenite Grain boundaries
- second-choice scrap in particular scrap containing copper, can be used as a raw material without undesired accumulation of copper at the grain boundaries of the P ⁇ maraustenite
- sufficient ferrite formation is achieved, for example, by cooling with water to a temperature of around 620 - 650 ° C with subsequent air cooling.
- the duration of the air cooling (approx. 8 seconds) is selected so that at least 70% of the austenite is converted to ferrite before the second cooling stage begins During the first cooling stage and during air cooling, a conversion in the Perht stage should be avoided
- the task is solved with the characterizing measures of claim 1 in that during the first cooling stage the cooling curve of the steels is set with a cooling rate of 20 K / s to 30 K / s so low that the cooling curve is at such a high temperature enters the ferrite area so that the ferrite formation can take place quickly and at least 70% of the austenite has already been converted into ferrite before the start of the second cooling stage
- the cooling curve runs into the ferrite area later at a higher temperature than in the known processes, i.e. the conversion of the austenite into ferrite begins somewhat delayed but at a higher temperature than at the known methods, and it also runs faster due to the higher temperature. It has an advantageous effect if the ferrite area is reached as quickly as possible with a high transformation temperature
- the principle of loosened cooling is used according to the invention. This is water cooling, in which water is applied to the cooling material from water cooling stages arranged one behind the other by influencing the number of water cooling stages, their distance from one another and The effective length of the water cooling stages allows the cooling rate or the amount of water applied to the cooling material (its cooling material mass and / or the surface of the cooling material) to be optimally adjusted.
- the cooling can also be achieved with an infinitely variable quantity of coolant
- the loosened cooling can be extended until the desired degree of conversion is reached, without the risk - as in the known methods with fast cooling - that the cooling curve leaves the ferrite area beforehand due to excessive cooling
- the production of dual-phase steels can take place on part of the cooling section.
- the part of the cooling section used is much shorter than in the known processes with Air cooling If the required structural components for dual-phase steels can be set without air cooling, this results in significant advantages for the operator. Fewer system components are required for the production of dual-phase steels.
- the production spectrum can be modified with changed process and strip parameters (e.g. higher strip speed). compared to be expanded so far.
- a system for carrying out the method of the invention is characterized by a cooling section arranged behind the last finishing mill stand, comprising a plurality of water cooling stages or cooling systems arranged one behind the other with a continuously variable amount of coolant.
- the number of water cooling stages, their effective length and their distance from one another can be changed according to the invention, so that this cooling section can be adapted in a simple manner to changed geometries of the goods to be cooled and to different belt speeds
- Fig. 1 is a schematic representation of the rapid cooling and the loosened cooling and their assignment in a rolling mill
- Fig. 3 shows the degree of Ausemtumumwandung with the fast
- Fig. 4 shows the degree of Ausemtumumwandung with the loosened
- FIG. 1 the end of a rolling mill is shown schematically, consisting of the last finish rolling stand (1), the rolling stock or cooling stock (2) and a reel (3) with deflection rollers or driver (4) Above this part of a rolling train are two different cooling sections drawn in With the cooling section (5) according to the prior art, an early, rapid cooling of the cooling material (2) is brought about by a coherent water supply. In the cooling section (6), according to the invention, water cooling stages (7) are arranged one behind the other, thereby cooling "loosened up"
- the cooling curve (9) shows the cooling process with the strategy commonly used today (early, rapid cooling to a certain holding temperature with subsequent air cooling, then further cooling to low temperatures below the martensite start temperature)
- the cooling curve (10) with its first cooling stage (14) reaches the ferrite area (F) at point (15) later in the loosened cooling compared to the cooling curve (9). Since the loosened cooling is initially maintained after reaching the ferrite area (F) no time-consuming holding time with air cooling is required and the cooling curve (10) leaves the ferrite area (F) earlier
- the loosened cooling is maintained within the ferrite area (F) until the desired degree of conversion is reached. Then the further cooling with the second cooling stage (16) takes place immediately.
- the invention is not limited to the exemplary cooling curves described in the illustrations, but also other cooling curves, such as, for example, in cooling systems with an infinitely variable amount of cooling agent, which in the sense of the invention lead to higher conversion temperatures, are also possible.
- the invention is not restricted to water cooling , but other cooling systems can be used, which lead to an early reaching of the ferrite area at high temperatures
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)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833321 | 1998-07-24 | ||
DE19833321A DE19833321A1 (de) | 1998-07-24 | 1998-07-24 | Verfahren und Anlage zur Herstellung von Dualphasen-Stählen |
PCT/EP1999/005113 WO2000005422A1 (fr) | 1998-07-24 | 1999-07-17 | Procede et installation pour produire des aciers a deux phases |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1108072A1 true EP1108072A1 (fr) | 2001-06-20 |
EP1108072B1 EP1108072B1 (fr) | 2002-09-25 |
Family
ID=7875154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99938282A Expired - Lifetime EP1108072B1 (fr) | 1998-07-24 | 1999-07-17 | Procede et installation pour produire des aciers a deux phases |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP1108072B1 (fr) |
JP (1) | JP2002521562A (fr) |
KR (1) | KR100578823B1 (fr) |
CN (1) | CN1173048C (fr) |
AT (1) | ATE224959T1 (fr) |
BR (1) | BR9912310A (fr) |
CA (1) | CA2338743C (fr) |
DE (2) | DE19833321A1 (fr) |
MY (1) | MY124339A (fr) |
RU (1) | RU2225453C2 (fr) |
WO (1) | WO2000005422A1 (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1013359A3 (fr) | 2000-03-22 | 2001-12-04 | Centre Rech Metallurgique | Procede pour la fabrication d'une bande en acier multiphase laminee a chaud. |
NL1016042C2 (nl) * | 2000-08-29 | 2001-07-24 | Corus Technology B V | Warmgewalste stalen band, werkwijze voor het vervaardigen ervan, en een daarmee vervaardigde wielschijf. |
AUPR048000A0 (en) * | 2000-09-29 | 2000-10-26 | Bhp Steel (Jla) Pty Limited | A method of producing steel |
KR100516519B1 (ko) * | 2001-12-26 | 2005-09-26 | 주식회사 포스코 | 제어압연 및 급속냉각 방식에 의한 2상조직 탄소강 선재및 봉강 제조방법 |
KR100521596B1 (ko) * | 2002-11-20 | 2005-10-12 | 현대자동차주식회사 | 직접통전가열에 의한 자동차부품 제조 방법 |
DE10327383C5 (de) * | 2003-06-18 | 2013-10-17 | Aceria Compacta De Bizkaia S.A. | Anlage zur Herstellung von Warmband mit Dualphasengefüge |
CN104001742A (zh) * | 2014-05-21 | 2014-08-27 | 中冶南方工程技术有限公司 | 一种对棒材精轧机组之间及机组后的轧件实现控制冷却的方法 |
CN104384207A (zh) * | 2014-10-22 | 2015-03-04 | 南京钢铁股份有限公司 | 一种热轧轴承钢棒材的控制冷却方法及其工艺布置 |
KR102440768B1 (ko) * | 2020-12-18 | 2022-09-08 | 주식회사 포스코 | 후강판 제조 장치 및 방법 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5818970B2 (ja) * | 1978-08-31 | 1983-04-15 | 川崎製鉄株式会社 | 冷間加工性の優れた高張力薄鋼板の製造方法 |
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 |
JPS57137452A (en) * | 1981-02-20 | 1982-08-25 | Kawasaki Steel Corp | Hot rolled high tensile steel plate having composite structure 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 |
JPS61170518A (ja) * | 1985-01-25 | 1986-08-01 | Kobe Steel Ltd | 成形性にすぐれた高強度熱延鋼板の製造方法 |
JPS6293006A (ja) * | 1985-10-18 | 1987-04-28 | Kobe Steel Ltd | 高強度熱延鋼板の製造法 |
JP3039842B2 (ja) * | 1994-12-26 | 2000-05-08 | 川崎製鉄株式会社 | 耐衝撃性に優れる自動車用熱延鋼板および冷延鋼板ならびにそれらの製造方法 |
FR2735148B1 (fr) * | 1995-06-08 | 1997-07-11 | Lorraine Laminage | Tole d'acier laminee a chaud a haute resistance et haute emboutissabilite renfermant du niobium, et ses procedes de fabrication. |
KR100301994B1 (ko) * | 1996-12-24 | 2001-11-22 | 이구택 | 열간압연선재의균일냉각방법 |
KR100747495B1 (ko) * | 2006-11-10 | 2007-08-08 | 삼성전자주식회사 | 용량가변 로터리 압축기 |
-
1998
- 1998-07-24 DE DE19833321A patent/DE19833321A1/de not_active Withdrawn
-
1999
- 1999-07-07 MY MYPI99002855A patent/MY124339A/en unknown
- 1999-07-17 EP EP99938282A patent/EP1108072B1/fr not_active Expired - Lifetime
- 1999-07-17 WO PCT/EP1999/005113 patent/WO2000005422A1/fr active IP Right Grant
- 1999-07-17 BR BR9912310-0A patent/BR9912310A/pt not_active IP Right Cessation
- 1999-07-17 JP JP2000561368A patent/JP2002521562A/ja active Pending
- 1999-07-17 DE DE59902877T patent/DE59902877D1/de not_active Expired - Lifetime
- 1999-07-17 RU RU2001105194/02A patent/RU2225453C2/ru active
- 1999-07-17 KR KR1020017000810A patent/KR100578823B1/ko active IP Right Grant
- 1999-07-17 AT AT99938282T patent/ATE224959T1/de not_active IP Right Cessation
- 1999-07-17 CA CA2338743A patent/CA2338743C/fr not_active Expired - Lifetime
- 1999-07-17 CN CNB998091405A patent/CN1173048C/zh not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0005422A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1311826A (zh) | 2001-09-05 |
KR100578823B1 (ko) | 2006-05-11 |
EP1108072B1 (fr) | 2002-09-25 |
DE19833321A1 (de) | 2000-01-27 |
WO2000005422A1 (fr) | 2000-02-03 |
BR9912310A (pt) | 2004-08-31 |
ATE224959T1 (de) | 2002-10-15 |
JP2002521562A (ja) | 2002-07-16 |
CN1173048C (zh) | 2004-10-27 |
MY124339A (en) | 2006-06-30 |
KR20010071978A (ko) | 2001-07-31 |
CA2338743C (fr) | 2010-03-30 |
RU2225453C2 (ru) | 2004-03-10 |
DE59902877D1 (de) | 2002-10-31 |
CA2338743A1 (fr) | 2000-02-03 |
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