EP2179066B1 - Verfahren zum herstellen eines oberflächenentkohlten warmbands - Google Patents

Verfahren zum herstellen eines oberflächenentkohlten warmbands Download PDF

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Publication number
EP2179066B1
EP2179066B1 EP08786978.0A EP08786978A EP2179066B1 EP 2179066 B1 EP2179066 B1 EP 2179066B1 EP 08786978 A EP08786978 A EP 08786978A EP 2179066 B1 EP2179066 B1 EP 2179066B1
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EP
European Patent Office
Prior art keywords
decarburising
steel strip
atmosphere
temperature
steel
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.)
Active
Application number
EP08786978.0A
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German (de)
English (en)
French (fr)
Other versions
EP2179066A1 (de
Inventor
Jian Bian
Axel Grafen
Giovanni Sabatino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
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Publication date
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Priority to PL08786978T priority Critical patent/PL2179066T3/pl
Publication of EP2179066A1 publication Critical patent/EP2179066A1/de
Application granted granted Critical
Publication of EP2179066B1 publication Critical patent/EP2179066B1/de
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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
    • C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
    • C21D3/02—Extraction of non-metals
    • C21D3/04—Decarburising
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0257—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel

Definitions

  • the invention relates to a method for producing a decarburized hot strip, which is produced from a quenching steel containing at least 0.4 wt .-% carbon.
  • Hot rolled strips produced from steels of this type have a high hardness and are therefore particularly suitable for the production of articles which are exposed to high localized loads during use. This is the case, for example, in the case of punching blades or comparable cutting tools in which both the cutting edge and the blade body carrying the cutting edge have to absorb high forces during the cutting operation in practical use.
  • the ductility of steels can be improved by decarburization annealing.
  • decarburization annealing For example, for deep-drawing deformation, certain steels made of soft steels are subjected to decarburization annealing. The aim is to obtain as even as possible a reduction in the carbon content over the entire sheet metal cross section in order to ensure the most uniform possible deformation behavior.
  • the cold strip is wound according to the known method to an "open coil” and annealed decarburizing as open-coil.
  • an open-coil is so loosely wound that its individual winding layers are separated by open spaces.
  • the reaction gas can flow through the intermediate spaces between the individual layers of the coil, so that with optimized gas flow guidance, each surface of the coil is swept in the same way by the gas.
  • thermoforming 0.03-0.06 wt .-% carbon-containing cold strip
  • DE-OS 2,105,218 Another possibility of decarburization annealing of a thermoforming, 0.03-0.06 wt .-% carbon-containing cold strip is in the DE-OS 2,105,218 described.
  • the cold strip is passed through a furnace in which a reducing atmosphere is maintained at an annealing temperature of less than 780 ° C.
  • the cycle time of the strip through the annealing furnace is adjusted so that its carbon content at the exit from the annealing furnace is less than 0.01 wt .-%.
  • a method for producing a steel strip in which a cold-rolled steel strip is produced from a steel having a C content of 0.3-2 wt%, and this cold-rolled steel strip is subsequently wound into an open coil.
  • the open coil is then subjected to an annealing treatment in which it is heated to an annealing temperature ranging between the A 1 temperature as the upper limit temperature and the lower limit temperature by up to 120 ° C below the A 1 temperature.
  • the steel strip was kept under a decarburizing atmosphere for 1 to 15 hours.
  • This type of decarburization treatment is performed with the aim of uniforming the decarburization depth achieved in decarburization annealing and of ensuring proper bonding between the decarburized layer and the undecarbelled, spherical carbide-containing core portion of the steel sheet.
  • the invention was based on the object to provide a method that allows the production of steel strip, in which high hardness on the one hand and good formability on the other hand are optimally combined with each other.
  • a steel strip is first produced in known manner from a quenching steel containing at least 0.4% by weight of carbon.
  • This steel strip can be a cold or a hot strip, the procedure according to the invention being particularly suitable for the treatment of hot strip which is to be processed with a specific thickness lying above the thickness of cold strip.
  • the steel strip is wound according to the invention to an open coil and heated as an open coil over a sufficiently long period of time to a decarburization annealing temperature.
  • This can be up to 20 ° C, especially up to 10 ° C, are below the A c1 temperature of the respective tempering steel and must not exceed the A c3 temperature of the respective tempering steel.
  • the decarburizing annealing of the steel strip in the open coil is then carried out under a decarburizing atmosphere for a decarburization annealing time of at least 90 minutes.
  • the decarburizing gas forming the decarburizing atmosphere flows through the gaps existing between the winding layers of the open coil.
  • the advantage of the decarburization annealing according to the invention in wound to an open coil steel strip is that can be achieved in this way time-saving uniform temperature distribution over the length and width of each processed steel strip.
  • the annealing conditions are chosen according to the invention so that there is a uniformly distributed structure state over the entire strip.
  • it is ensured by the inventively given range of annealing temperature that in each processed band still sufficient amounts of ferrite are present to allow rapid diffusion of the carbon. This is up to a hundredfold faster in ferrite than in austenite.
  • the decarburization annealing temperature according to the invention is preferably set in a range which is lower by 10-20 ° C. than the A C1 temperature. With this setting of the decarburization annealing temperature, it is ensured that the tempering steel of the processed steel strip in each case has ferritic structure, so that an optimal diffusion rate of the carbon is achieved.
  • the open coil is accelerated cooled to prevent any undesirable and, in terms of its extent, insecure subsequent diffusion of carbon into the previously deliberately decarburized surface layer due to the inherent heat of the coil.
  • the accelerated cooling should take place as soon as possible, as soon as possible after the end of the decarburization annealing time and at a cooling rate of at least 1 ° C / min.
  • the accelerated cooling is carried out under protective gas. This measure also serves to prevent uncontrolled decarburization of the steel strip during cooling as much as possible.
  • a decarburized surface layer measured from the respective surface of the steel strip is present whose depth is in each case less than one quarter of the thickness of the steel strip, so that only areas near the surface are included in the decarburization according to the invention.
  • the parameters of the method according to the invention are preferably chosen so that decarburization depths of a maximum of 120 ⁇ m, in particular 30-120 ⁇ m, are achieved.
  • the steel strip obtained by the procedure according to the invention is consequently characterized in that, as a consequence of the decarburization treatment, it has a high bend formability in the region of a near-surface Owns layer. At the same time, due to the fact that the high initial carbon content is still obtained in the core region of the finished decarburized steel strip, the strip treated according to the invention has a high core hardness.
  • heat-treated steel strip as a result of WeichglühClouds has a relation to the initial state lowered strength, which has a favorable effect on the possibilities of further processing.
  • the method according to the invention can be carried out particularly inexpensively and efficiently.
  • steel sheet produced according to the invention can be used particularly well, for example, for the production of punching knives or similar objects which, if necessary, must be bent sharply in order to obtain their intended shape.
  • the production of a semifinished product made of sheet steel according to the invention may include separation operations, such as stamping or cutting, as well as forming operations, such as deep drawing or bending. If necessary, the so manufactured Semi-finished products also undergo a final compensation treatment.
  • the decarburization time selected in each case when carrying out the process according to the invention depends on the respectively required decarburization depth. It is typically at least 90 minutes. According to experience, the decarburization depth of at least 30 ⁇ m can be achieved in this time, for example in the case of tempered steels having a C content of 0.55% by weight, under the operating parameters prescribed by the invention.
  • the duration over which the decarburization treatment according to the invention has to be carried out in order to achieve a specific decarburization depth can be determined for a given decarburization temperature, given decarburization depth and given dew point of the decarburisation atmosphere on the basis of the carbon content and the coil weight of the steel strip to be treated. If the decarburization depth is to be limited to a maximum of 120 ⁇ m, experience has shown that the decarburization annealing time can be limited to a maximum of 120 minutes.
  • a gas mixture of nitrogen, hydrogen and steam is also used in the implementation of the decarburization according to the invention as decarburization gas.
  • decarburization gas typically, such a decarburizing atmosphere at a dew point between 20-28 ° C, especially 20-26 ° C, contains 85-97% by volume of nitrogen and 3-15% 7% by volume of hydrogen, with one being used in practice Atmosphere typically contains 93 vol .-% nitrogen and 7 vol .-% hydrogen.
  • the heating to the decarburization temperature also takes place in the process according to the invention initially under a protective gas atmosphere.
  • the inert gas atmosphere maintained during the heating may contain 85-97% by volume of nitrogen and 3-15% by volume of hydrogen, with a protective gas atmosphere used in practice typically having 93% by volume of nitrogen and 7% of hydrogen.
  • steam is then added to this atmosphere to provide the reducing decarburization atmosphere under which the decarburization reaction starts C + H 2 O -> CO + H 2 .
  • the amount of water required for the decarburization reaction in the furnace can be regulated as a function of the dew point.
  • the dew point of the decarburizing atmosphere may be detected throughout the decarburization annealing time.
  • the water vapor content of the decarburizing atmosphere is then adjusted so that the dew point of the atmosphere is maintained in the range of 20-26%.
  • the steel strip In order to remove possibly existing oxide layers and lubricant residues on the processed steel strip, the steel strip should be pickled before winding to the open coil.
  • the obtained steel strip may be about Be favorable to temper the steel strip after pickling and before winding to the open coil.
  • the method according to the invention can be carried out in a particularly simple manner when the heating and decarburization annealing of the open coil takes place in a hood annealing furnace.
  • a tempering steel suitable for the production of steel sheets processed according to the invention typically has the following composition (in% by weight): C: 0.4 - 1.0% Si: 0.1 - 0.5% Mn: 0.3 - 1.2% P: ⁇ 0.02% S: ⁇ 0.008% al: 0.01 - 0.05% Cr: 0.1 - 0.5% Ni: 0.1 - 0.4% Not a word: ⁇ 0.1%
  • One consisting of an addition of iron and unavoidable impurities (in% by weight) 0.5% C, 0.2% Si, 0.75% Mn, ⁇ 0.12% P, ⁇ 0.003% S, 0.02% Al and 0.1% Cr containing tempering steel has been cast in conventional continuous casting to a starting material, such as a slab or thin slab.
  • the slab has been hot rolled in a conventional manner to a steel strip.
  • the final temperature of the hot rolling was in the range of 850-950 ° C, with the actual hot rolling end temperature selected here being 900 ° C.
  • the steel strip emerging from the finishing roll scale as a hot strip at this hot rolling end temperature has been cooled to a reeling temperature of 600-620 ° C. and wound into a conventional coil with layers lying close together. Specifically, the reel temperature selected was 620 ° C.
  • the steel strip is isolated and pickled in a manner which is also known per se and immediately thereafter temper rolling.
  • the temper rolled steel strip was then wound in a conventional manner to an open coil.
  • the winding layers of the steel strip have been held by inserting a wire or other suitable means at a distance, that between each two adjacent layers, a gas-permeable space is formed.
  • the steel strip is then placed as an open coil in a bell annealing furnace and heated for a heating time of 10 hours under a 93% by volume N and 7% by volume H 2 containing protective gas atmosphere until the entire coil has the decarburization annealing temperature of 700 ° C had.
  • the open coil was kept under this atmosphere for a decarburization annealing time of 90 minutes.
  • the dew point of the decarburization atmosphere prevailing in the hood furnace has been recorded continuously and adjusted to a desired value.
  • the composition of the decarburization atmosphere, in particular its water vapor content, has been adjusted so that its dew point has been maintained substantially constant at 26 ° C.
  • the open coil has been cooled in the hood furnace under a protective gas atmosphere at a cooling rate of 1 ° C / min.
  • the surface-decarburized steel strip thus obtained had decarburized surface layers adjacent to its surfaces, 40 ⁇ m thick, while being decarburized Surface layers adjacent inner core region still possessed the carbon content of the parent steel.
  • the respectively achieved decarburization depth ⁇ t is in a range of 30-120 ⁇ m.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP08786978.0A 2007-08-17 2008-08-07 Verfahren zum herstellen eines oberflächenentkohlten warmbands Active EP2179066B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08786978T PL2179066T3 (pl) 2007-08-17 2008-08-07 Sposób wytwarzania odwęglonej powierzchniowo taśmy walcowanej na gorąco

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007039013A DE102007039013B3 (de) 2007-08-17 2007-08-17 Verfahren zum Herstellen eines oberflächenentkohlten Warmbands
PCT/EP2008/060378 WO2009024472A1 (de) 2007-08-17 2008-08-07 Verfahren zum herstellen eines oberflächenentkohlten warmbands

Publications (2)

Publication Number Publication Date
EP2179066A1 EP2179066A1 (de) 2010-04-28
EP2179066B1 true EP2179066B1 (de) 2013-05-01

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Application Number Title Priority Date Filing Date
EP08786978.0A Active EP2179066B1 (de) 2007-08-17 2008-08-07 Verfahren zum herstellen eines oberflächenentkohlten warmbands

Country Status (8)

Country Link
US (1) US8449694B2 (pl)
EP (1) EP2179066B1 (pl)
JP (1) JP5599708B2 (pl)
CN (1) CN101802232B (pl)
DE (1) DE102007039013B3 (pl)
ES (1) ES2422738T3 (pl)
PL (1) PL2179066T3 (pl)
WO (1) WO2009024472A1 (pl)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4943558B2 (ja) * 2009-08-31 2012-05-30 新日本製鐵株式会社 高強度溶融亜鉛めっき鋼板及びその製造方法
DE102009044861B3 (de) * 2009-12-10 2011-06-22 ThyssenKrupp Steel Europe AG, 47166 Verfahren zum Herstellen eines gut umformbaren Stahlflachprodukts, Stahlflachprodukt und Verfahren zur Herstellung eines Bauteils aus einem solchen Stahlflachprodukt
DE102010034161B4 (de) * 2010-03-16 2014-01-02 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung von Werkstücken aus Leichtbaustahl mit über die Wanddicke einstellbaren Werkstoffeigenschaften
DE102010032919B4 (de) * 2010-07-30 2023-10-05 Air Liquide Deutschland Gmbh Verfahren und Vorrichtung zum Befeuchten eines brennbaren Gases
CN102226230A (zh) * 2011-04-15 2011-10-26 广东盈泉钢制品有限公司 一种碳素超深冲钢带的生产方法
KR101344534B1 (ko) 2011-06-28 2013-12-26 현대제철 주식회사 탈탄층 형성을 사용한 강재의 내식성 향상 방법

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GB1189464A (en) * 1967-11-06 1970-04-29 Richard Thomas & Baldwins Ltd Production of Deep-Drawing Steel
DE2105218B2 (de) * 1970-02-04 1974-09-26 Nippon Kokan K.K., Tokio Herstellung von feuerverzinktem Tiefziehstahl
JPS539170B2 (pl) * 1972-09-08 1978-04-04
JPS5594444A (en) 1979-01-09 1980-07-17 Kawasaki Steel Corp Production of high carbon hot rolled steel plate of high strength and toughness and good workability
JPS5655520A (en) * 1979-10-09 1981-05-16 Kawasaki Steel Corp Production of surface decarbonized high carbon steel strip
JPS5890386A (ja) * 1981-11-25 1983-05-30 Sumitomo Metal Ind Ltd 鍛接管用ホツトコイルの製造方法
JPS62196321A (ja) 1986-02-24 1987-08-29 Sumitomo Metal Ind Ltd 表面軟化厚鋼板の製造方法
JPH02175839A (ja) 1988-12-28 1990-07-09 Kawasaki Steel Corp 溶接性、加工性に優れた高強度冷延鋼板およびその製造方法
JPH0693329A (ja) * 1992-09-14 1994-04-05 Nisshin Steel Co Ltd 焼付け硬化性に優れた冷延鋼板の製造方法
JPH06158157A (ja) 1992-11-27 1994-06-07 Nisshin Steel Co Ltd 冷延特殊鋼表面脱炭鋼帯の製造方法
JPH0770635A (ja) * 1993-08-31 1995-03-14 Nisshin Steel Co Ltd 冷延特殊鋼表面脱炭鋼帯の製造方法
CN1167815C (zh) * 2001-08-13 2004-09-22 宁波宝新不锈钢有限公司 全氢气保护下的热轧不锈钢退火工艺
FR2867991B1 (fr) * 2004-03-25 2007-05-04 Ugine Et Alz France Sa Bandes en acier inoxydable austenitique d'aspect de surface mat

Also Published As

Publication number Publication date
US8449694B2 (en) 2013-05-28
ES2422738T3 (es) 2013-09-13
JP2010537045A (ja) 2010-12-02
WO2009024472A1 (de) 2009-02-26
JP5599708B2 (ja) 2014-10-01
DE102007039013B3 (de) 2008-08-14
CN101802232A (zh) 2010-08-11
EP2179066A1 (de) 2010-04-28
US20100319812A1 (en) 2010-12-23
CN101802232B (zh) 2012-07-04
PL2179066T3 (pl) 2013-09-30

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