EP1060277A1 - Procede d'amelioration de feuillards d'acier - Google Patents

Procede d'amelioration de feuillards d'acier

Info

Publication number
EP1060277A1
EP1060277A1 EP99955822A EP99955822A EP1060277A1 EP 1060277 A1 EP1060277 A1 EP 1060277A1 EP 99955822 A EP99955822 A EP 99955822A EP 99955822 A EP99955822 A EP 99955822A EP 1060277 A1 EP1060277 A1 EP 1060277A1
Authority
EP
European Patent Office
Prior art keywords
tempering
temperature
strip
zone
hardening
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Withdrawn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
EP99955822A
Other languages
German (de)
English (en)
Inventor
Joerg Huber
Manfred Wilhelm
Julius Mazurkiewicz
Heinz Hoefinghoff
Peter Rademacher
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1060277A1 publication Critical patent/EP1060277A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • C21D9/56—Continuous furnaces for strip or wire
    • 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
    • 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

Definitions

  • the invention is based on a method for tempering steel strips in the course of the type defined in the preamble of claim 1.
  • Tempering steel strips is their heat treatment to achieve an optimal combination of toughness and tensile strength.
  • the tempering consists of hardening and tempering. During the hardening process, the strip material is heated to temperatures above the GSK line drawing in the iron-carbon diagram, left there for a dwell time and then in a cooling bath with a slightly higher cooling rate than the critical one deterred. During tempering, the steel strip hardened in this way is heated to the so-called tempering temperature and then cooled.
  • the inventive method with the features of claim 1 has the advantage that a quasi-constant hardness profile in the longitudinal direction of the steel strip is achieved when tempering steel strips, in particular spring steel strips, with a strip thickness that is variable over the strip length despite the continuously changing strip thickness. Because the tempering temperature is only reached "as late as possible", the dwell time of the strip material at the tempering temperature is extremely short, and the final hardness of the steel strip is determined solely by the tempering temperature, while the dwell time no longer has any influence on the final hardness.
  • the tempering zone is divided into several temperature zones and the steel strip is passed through the temperature zones in such a way that it passes through the tempering temperature-producing temperature zone last.
  • the strip material is already heated to such an extent that in the last temperature zone the tempering temperature is reached almost equally quickly in both the thick and the thin strip areas and thus the dwell time is almost the same size at tempering temperature for all belt areas.
  • This rapid heating of the strip material to the tempering temperature in the last temperature zone is achieved according to a preferred embodiment of the invention by heat radiation and by a short exposure distance for this heat radiation on the strip material.
  • a good thermal insulation of the last temperature zone compared to the previous temperature zone is of great advantage.
  • the method has a hardening furnace, a cooling bath and a tempering furnace as well as a drive device guiding the steel strip through the system.
  • the tempering furnace is divided into several temperature zones
  • the speed of the steel strip is adjusted so that the strip material only reaches the tempering temperature immediately before leaving the last temperature zone.
  • FIG. 2 is an enlarged view of a tempering furnace in the system of FIG. 1,
  • FIG. 3 shows a diagram of the course of thickness and hardness over the length of the steel strip, which has been tempered by a conventional method
  • Fig. 4 is a same diagram of the course of the thickness
  • Fig. 5 shows the same representation as in Fig. 4 with a tempering of the steel strip with a higher hardness specification. Description of the embodiment
  • the system for tempering steel strips, in particular spring steel strips with a strip thickness that is variable over the strip length in the continuous process, schematically sketched in FIG. 1 largely corresponds to known compensation systems for steel strips with constant thickness and is only modified with regard to the formation of a necessary tempering furnace.
  • this tempering system has a reel group 11 for the steel strip 10 that is usually rolled up for winding, a straightening device 12 for straightening the rolling steel strip 10, a welding machine 13 for welding steel strip coils successively placed on the unwinding group 11, a driver 14 for pulling off the steel strip 10 from the winding, a loop pit 15, a hardening furnace 16, a metal cooling belt 17, an air cooler 18, a tempering furnace 19, a protective gas cooler 20, a drive device for pulling the steel belt 10 through the system, also called a pulling frame 21, a pair of scissors 22 to separate the in the
  • Welding machine 13 steel strips 10 welded together from successive coils and a reel-up group 23 for winding up the tempered steel strip 10.
  • 24 are supply rolls with non-tempered steel strips 10, which are successively inserted into the unwinding group 11, and 25 supply rolls with wound, coated steel strips 10, which have been taken out of the reeling group 23 one after the other.
  • the tempering furnace 19 is in three Te perturzonen 26, 27 and 28 divided, which are thermally insulated from one another and are passed through by the steel strip 10 in succession.
  • the temperature zones 26-28 are designed so that only the last temperature zone 28 in the direction of passage of the steel strip 10 causes the strip material to be heated to the required tempering temperature.
  • the last temperature zone 28 is equipped with heat radiators 29 and the zone length of the last temperature zone 28 is matched to the throughput speed of the steel strip 10 so that the strip material only reaches the tempering temperature immediately before leaving the last temperature zone 28.
  • the preceding temperature zones 26, 27 are designed such that the strip material is already heated to a temperature below the tempering temperature, and thus the heating to the tempering temperature by the heat radiators 29 in the last temperature zone 28 until immediately before the strip material exits the last temperature zone 28 is reached quickly.
  • the steel strip 10 is tempered with a variable strip thickness over the strip length in the tempering system described as follows:
  • the driver 14 pulls the strip material 10 from a strip roll inserted into the uncoiling group 11, while the pull-through frame 21 pulls the steel strip 10 through the
  • the rocking groove 15 ensures a band compensation in the event of drive slip in the driver 14 and pull-through frame 21.
  • the hardening of the steel band 10 in the hardening furnace 16 is carried out in a conventional manner by heating the steel band 10 to a temperature which is above the Lines line GSK of the iron-carbon diagram, and then quenching the steel strip 10 with a slightly greater than the critical cooling rate in the metal cooling bath 17. After the air cooler 18, the steel strip 10 is martensitic and becomes subsequently
  • Tempering part consisting of tempering furnace 19 and protective gas cooler 20, left bright to uniform strength.
  • the connecting frame 21 adjoining the starting part pulls the steel strip 10 at a constant speed, and the asphalt group 23 winds the tempered steel strip 10 onto a supply roll 25, which after filling is taken out of the reel pit 23 and replaced by an empty supply roll 25.
  • the strip material 10 is now heated so that it only reaches the tempering temperature immediately before leaving the tempering furnace 19.
  • the steel strip 10 passes through the three temperature zones 26, 27, 28 and receives the required tempering temperature as late as possible, namely only immediately before leaving the last temperature zone 28.
  • the residence time of the strip material at the tempering temperature is extremely short, so that it has no influence the hardening result can take and the final hardness of the strip material is determined solely by the tempering temperature.
  • the compensation result of a steel strip section is shown in comparison to a conventional compensation method.
  • 3 shows the compensation result for a strip section which has been compensated according to the conventional compensation method.
  • the curve 1 represents the course of the thickness of the band section over the band length.
  • Curve 2 shows the course of strength or hardness (HV values) over the length of the band section. It can clearly be seen that the hardness values fluctuate with the strip thickness and the areas with a smaller strip thickness have lower HV values than the strip areas with a larger strip thickness.
  • the strip material was exposed to approximately the same hardening temperature.
  • the tempering temperature in the case of FIG. 3 was constant and was at a higher temperature level than in the case of FIG. 4.
  • the tempering temperature in the case of FIG. 4 was lower in the two temperature zones 26, 27 than the required tempering temperature in the last temperature zone 28 .
  • Tape material is dimensioned the same size as in the case of FIG. 4 and constant.
  • the tempering temperature was significantly reduced and the temperature differences between the temperature zones 26, 27 with the same temperature value and the tempering temperature brought about in the last temperature zone were reduced.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Selon l'invention, dans un procédé d'amélioration en continu de feuillards d'acier - au cours duquel le matériau de feuillard, pour la trempe, est chauffé à une température de trempe, puis est brusquement refroidi, et exposé à une température de revenu, pour le revenu - le matériau de feuillard est, lors du revenu, et pour que l'on puisse atteindre une allure du processus de trempe quasi constante pour des feuillards d'acier présentant des épaisseurs de feuillard variables sur toute la longueur du feuillard, chauffé de façon à atteindre la température de revenu immédiatement avant la sortie de la zone de revenu. Pour que le temps de séjour à la température de revenu n'ait plus aucune influence sur la dureté finale du matériau de feuillard, celle-ci est exclusivement déterminée par la température de revenu.
EP99955822A 1998-12-28 1999-09-30 Procede d'amelioration de feuillards d'acier Withdrawn EP1060277A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1998160472 DE19860472A1 (de) 1998-12-28 1998-12-28 Verfahren zum Vergüten von Stahlbändern
DE19860472 1998-12-28
PCT/DE1999/003152 WO2000039349A1 (fr) 1998-12-28 1999-09-30 Procede d'amelioration de feuillards d'acier

Publications (1)

Publication Number Publication Date
EP1060277A1 true EP1060277A1 (fr) 2000-12-20

Family

ID=7892958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99955822A Withdrawn EP1060277A1 (fr) 1998-12-28 1999-09-30 Procede d'amelioration de feuillards d'acier

Country Status (4)

Country Link
EP (1) EP1060277A1 (fr)
JP (1) JP2002533575A (fr)
DE (1) DE19860472A1 (fr)
WO (1) WO2000039349A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10238972B4 (de) * 2002-08-20 2004-07-15 C.D. Wälzholz Produktionsgesellschaft mbH Verfahren und Vorrichtung zur Durchlaufvergütung von Bandstahl sowie entsprechend hergestellter Bandstahl
DE102006042569B3 (de) * 2006-09-11 2008-01-31 Hugo Vogelsang Gmbh & Co. Kg Verfahren und Vorrichtung zum Vergüten von Stahlbändern
DE102013114578A1 (de) * 2013-12-19 2015-06-25 Sandvik Materials Technology Deutschland Gmbh Glühofen und Verfahren zum Glühen eines Strangs aus Stahl
CN107523668B (zh) * 2017-09-01 2019-06-25 华菱安赛乐米塔尔汽车板有限公司 一种无镀层变强度钢复合材料

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE727632C (de) * 1938-03-06 1942-11-07 Siemens Ag Gluehofen mit ununterbrochener Gutfoerderung
US3099592A (en) * 1960-01-11 1963-07-30 British Iron Steel Research Process of annealing low carbon steel
GB974774A (en) * 1961-10-20 1964-11-11 Westinghouse Electric Corp Continuous annealing method and apparatus
DE2511805B2 (de) * 1975-03-18 1978-05-11 Nippon Kokan K.K., Tokio Herstellung hochfester, kaltgewalzter Tiefziehstähle durch die Anwendung eines kontinuierlichen Wärmebehandlungsverfahrens
BE905254A (fr) * 1985-08-13 1986-12-01 Kawasaki Steel Co Procede et appareil pour recuit en continu d'aciers au carbone.
JPH05195081A (ja) * 1992-01-14 1993-08-03 Nippon Steel Corp 厚板の製造法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0039349A1 *

Also Published As

Publication number Publication date
WO2000039349A1 (fr) 2000-07-06
DE19860472A1 (de) 2000-07-06
JP2002533575A (ja) 2002-10-08

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