EP1484419A2 - Procédure de fabrication des bandes d'acier carburées - Google Patents

Procédure de fabrication des bandes d'acier carburées Download PDF

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Publication number
EP1484419A2
EP1484419A2 EP04013061A EP04013061A EP1484419A2 EP 1484419 A2 EP1484419 A2 EP 1484419A2 EP 04013061 A EP04013061 A EP 04013061A EP 04013061 A EP04013061 A EP 04013061A EP 1484419 A2 EP1484419 A2 EP 1484419A2
Authority
EP
European Patent Office
Prior art keywords
coil
content
steel strip
temperature
annealing
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.)
Withdrawn
Application number
EP04013061A
Other languages
German (de)
English (en)
Other versions
EP1484419A3 (fr
Inventor
Jian Dr.-Ing. Bian
Karl-Ernst Dipl.-Ing. Friedrich
Giovanni Dipl.-Ing. Sabatino
Horst Walter Dr. Tamler
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 Stahl AG
ThyssenKrupp Steel AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Stahl AG, ThyssenKrupp Steel AG filed Critical ThyssenKrupp Stahl AG
Publication of EP1484419A2 publication Critical patent/EP1484419A2/fr
Publication of EP1484419A3 publication Critical patent/EP1484419A3/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/667—Multi-station furnaces
    • C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment

Definitions

  • the invention relates to a method for producing Steel strips in which the carbon content in one Surface layer of the respective steel strip in one separate operation is increased.
  • Carbon steels with a C content of at least 0.1 % By weight usually becomes a component first reshaped, then the carburizing piece by piece To be subjected to annealing treatment. This piece by piece carburizing takes place both with regard to the completing work steps as well as in terms of the resulting costs are complex.
  • the object of the invention was a method to indicate with which in a particularly economical manner Steel strips with a high hardness of theirs Surface layers and accordingly higher Have wear resistance created.
  • This object is achieved according to the invention by a method for producing steel strips, in which a coil which is coiled from a steel strip having an initial content of carbon in such a way that its layers are arranged at a distance from one another at a reaction temperature above the A c3 temperature is subjected to an annealing process in which a carburizing gas is passed through the space between the individual layers of the coil until in the edge layer of the steel strip there is at least 0.1% by weight, in particular at least 0.3% by weight, of the starting content. -% increased C content is reached.
  • the initial carbon content of the steel strips processed according to the invention is preferably at least 0.1% by weight. In particular, it is in the range of up to 0.4% by weight.
  • the annealing treatment then takes place, for example, in a carburizing atmosphere in a bell annealer which has been modified in accordance with the control options resulting from the method according to the invention.
  • the reaction temperature set in the carburizing annealing according to the invention is above the transition temperature A c3 , preferably up to 30 ° C. above the A c3 temperature, in particular at least 900 ° C.
  • the glow time over which the coil is on the reaction temperature is maintained for up to ten hours.
  • the method according to the invention can be used in this way produce steel strips that are particularly economical a hardened, wear-resistant surface at the same time good forming properties of the base material have.
  • Steel alloys such as case hardening or tempering steels typical carbon contents in the range of 0.1 - 0.25% by weight or 0.2-0.4% by weight.
  • a surface layer generate in which the carbon content versus the C content of the starting material by at least 0.1% by weight, in particular at least 0.3% by weight is increased.
  • the increase in the carbon content in the surface layer as well as the depth over which the carbon content at Application of the method according to the invention is increased can be determined via the annealing temperature, the annealing time and the Control the composition of the reaction gas.
  • the process can control the carbon content in each Surface layer can be increased to 0.4-0.9% by weight.
  • carbon content in the Achieve surface layer that 0.6 wt .-% to 0.9 wt .-% be.
  • the thickness of the carburized surface layer lies regularly between 50 - 500 ⁇ m, with the Depth over which it carburizes the surface layer of the Steel strips comes through the process parameters mentioned can be controlled. Depending on the desired The result of the work can be useful Process parameters during the carburizing process vary.
  • a gas mixture containing CO, H 2 and / or CO 2 can be used as the carburizing gas.
  • Such gas mixtures are composed, for example, of 20% CO, 40% H 2 and the remainder N 2 .
  • a hood annealing device can be used based to a conventional type of bell annealer Possibility of one regarding type, duration and quantity controlled gas supply is expanded.
  • the strip obtained after the annealing treatment can be cold rolled and processed into semi-finished products. if necessary it can be subjected to soft annealing.
  • the Production of the semi-finished products can involve a separation operation, like punching or cutting, and / or one Forming operations such as deep drawing or bending include. If necessary, the semi-finished products produced in this way undergo remuneration treatment.
  • the hood annealer 1 has an oven chamber 3 surrounded by a conventionally designed annealing hood 2, into which a steel strip S wound as an open coil C is inserted.
  • the known alloy specification for the steel strip S used is given in Table 1.
  • C Si Mn P S al Cr Cu Ni from 0.13 to 0.16 ⁇ 0.06 0.50-0, 60 ⁇ 0.02 ⁇ 0.012 0.015 to 0.04 ⁇ 0.06 ⁇ 0.1 ⁇ 0.06 All figures in% by weight, remainder Fe and unavoidable impurities
  • the hood annealer 1 is also provided with a gas connection 4 for a protective gas, here N 2 , with a gas connection 5 for reaction gas RGas, which is formed here by a mixture of CO, CO 2 and H 2 , with an exhaust gas discharge 6 and with different connections 7 equipped, among other things, the carbon level C P , the furnace chamber temperature T O and the composition of the atmosphere present in the furnace chamber can be detected.
  • measurements can be carried out on the coil C itself via the connections 7, for example in order to determine the progress of the heating or carburizing as well as the gas flow through the coil C.
  • a control device 8 Connected to the connections 7 is a control device 8 which, over the duration of the entire carburizing process, the development of the furnace chamber temperature T O, the carbon level C P of the atmosphere in the furnace chamber 3 and the composition ZGas of the gases passed into the furnace chamber 3 (reaction gas RGas / protective gas N 2 ) controls.
  • the hot or cold rolled, pickled if necessary Steel strip S the thickness of which is, for example, 0.8 to 3 mm and the width of which can be 600 to 1200 mm is considered dense Delivered wound coil, not shown here, whose Weight is up to 20 tons.
  • thermocouple In order to ensure a uniform temperature across the turns, a thermocouple has been installed in the inner and the middle turn of the coil C.
  • the temperature T K of the coil core (central turn) and the temperature T R of the coil edge (internal turn) were measured online with the thermocouples during the entire carburizing process.
  • the temperature profiles T K , T R and T O are shown in FIG. 2 over the process time t.
  • the open-coil C wound in this way was inserted cold into the furnace space 3 after the wrapping.
  • the oven temperature T O was 750 ° C. at the time the cold coil C was inserted.
  • the open-coil C was held for several hours until it was further heated to the reaction temperature of 900 ° C.
  • the coil C in the furnace space 3 was kept under protective gas (N2).
  • the heating rate measured on the inner turn was 0.026 ° C / s.
  • the carburization was only initiated after the temperatures T K and T R of the coil C had each reached the predetermined reaction temperature of 900 ° C.
  • the reaction temperature was reached, the reaction gas RGas was passed into the furnace chamber 3.
  • the introduction into the furnace room 3 was via the furnace ceiling.
  • the introduced reaction gas RGas was put into a gas flow by a fan, not shown, which flow was evenly distributed between the turns of the open coil C.
  • the coil C was carburized over a period t H of 8 hours.
  • the C level which is a decisive parameter for the carburizing process and primarily determines the marginal carbon content and the carburizing depth, was kept constant at 1.0% in the carburizing phase by controlling the amount of reaction gas RGas supplied.
  • the carbon potential is referred to as the "C level" which indicates to what concentration the carbon is enriched in austenite in equilibrium. It is to be understood as the C content, which is in the Equilibrium state with a pure iron sample at one certain temperature in the austenite.
  • the C level is therefore the most important parameter in practice to monitor the carburizing behavior of GasaufkohlungsatmosphDC.
  • the coil C in the furnace chamber 3 was again cooled under protective gas (N2) over a period of 12 hours to a final temperature of 80 ° C., which is below the oxidation limit.
  • the cooling rate measured on the inner turn of the coil C during the cooling time t K was 0.014 ° C./s.
  • the coil C After cooling to 80 ° C, the coil C has been removed from the oven 2. The shape of the coil was well preserved after carburizing. The turns did not stick together during the carburizing at 900 ° C. and the carburizing time t H of 8 hours.
  • FIG. 3 shows the layer structure of the steel strip S obtained after the carburizing treatment and the carbon content% C is plotted over the thickness d of the steel strip.
  • the carburization depth d K results in the high C content C% R , which drops in the direction of the base layer G of the steel strip S arranged centrally between the surface layers R to the initial content% C A ,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP04013061A 2003-06-05 2004-06-03 Procédure de fabrication des bandes d'acier carburées Withdrawn EP1484419A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003125795 DE10325795B4 (de) 2003-06-05 2003-06-05 Verfahren zum Herstellen von aufgekohlten Stahlbändern
DE10325795 2003-06-05

Publications (2)

Publication Number Publication Date
EP1484419A2 true EP1484419A2 (fr) 2004-12-08
EP1484419A3 EP1484419A3 (fr) 2005-10-19

Family

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Family Applications (1)

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EP04013061A Withdrawn EP1484419A3 (fr) 2003-06-05 2004-06-03 Procédure de fabrication des bandes d'acier carburées

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EP (1) EP1484419A3 (fr)
DE (1) DE10325795B4 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019007488A1 (de) * 2019-10-28 2021-04-29 Daniel Haug Verfahren zur Wärmebehandlung von Metallerzeugnissen, mit einer nicht entflammbaren Prozessatmosphäre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6338556A (ja) * 1986-08-04 1988-02-19 Nisshin Steel Co Ltd 耐二次加工割れ性の優れた深絞り用冷延鋼板およびその製造方法
JPH0394022A (ja) * 1989-09-05 1991-04-18 Kobe Steel Ltd 耐２次加工脆性に優れた深絞り用熱延鋼板の製造方法
JPH04272143A (ja) * 1991-02-28 1992-09-28 Nippon Steel Corp 耐デント性の優れた深絞り用冷延鋼板の製造方法
EP0626467A1 (fr) * 1992-10-15 1994-11-30 Kawasaki Steel Corporation Procede permettant de cementer en continu un feuillard d'acier
WO1998054371A1 (fr) * 1997-05-27 1998-12-03 Centre De Recherches Metallurgiques Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees
US6110296A (en) * 1998-04-28 2000-08-29 Usx Corporation Thin strip casting of carbon steels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6338556A (ja) * 1986-08-04 1988-02-19 Nisshin Steel Co Ltd 耐二次加工割れ性の優れた深絞り用冷延鋼板およびその製造方法
JPH0394022A (ja) * 1989-09-05 1991-04-18 Kobe Steel Ltd 耐２次加工脆性に優れた深絞り用熱延鋼板の製造方法
JPH04272143A (ja) * 1991-02-28 1992-09-28 Nippon Steel Corp 耐デント性の優れた深絞り用冷延鋼板の製造方法
EP0626467A1 (fr) * 1992-10-15 1994-11-30 Kawasaki Steel Corporation Procede permettant de cementer en continu un feuillard d'acier
WO1998054371A1 (fr) * 1997-05-27 1998-12-03 Centre De Recherches Metallurgiques Procede de fabrication en continu d'une bande en acier pour emboutissage presentant des proprietes de surface ameliorees
US6110296A (en) * 1998-04-28 2000-08-29 Usx Corporation Thin strip casting of carbon steels

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN Bd. 012, Nr. 252 (C-512), 15. Juli 1988 (1988-07-15) & JP 63 038556 A (NISSHIN STEEL CO LTD), 19. Februar 1988 (1988-02-19) *
PATENT ABSTRACTS OF JAPAN Bd. 015, Nr. 275 (C-0849), 12. Juli 1991 (1991-07-12) & JP 03 094022 A (KOBE STEEL LTD), 18. April 1991 (1991-04-18) *
PATENT ABSTRACTS OF JAPAN Bd. 017, Nr. 067 (C-1025), 10. Februar 1993 (1993-02-10) & JP 04 272143 A (NIPPON STEEL CORP), 28. September 1992 (1992-09-28) *

Also Published As

Publication number Publication date
DE10325795B4 (de) 2005-07-28
DE10325795A1 (de) 2005-01-13
EP1484419A3 (fr) 2005-10-19

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