EP1050591A3 - Thermal treatment process for manufacturing surface hardened unalloyed or low alloyed, elongated or flat steel products - Google Patents

Thermal treatment process for manufacturing surface hardened unalloyed or low alloyed, elongated or flat steel products Download PDF

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Publication number
EP1050591A3
EP1050591A3 EP00108714A EP00108714A EP1050591A3 EP 1050591 A3 EP1050591 A3 EP 1050591A3 EP 00108714 A EP00108714 A EP 00108714A EP 00108714 A EP00108714 A EP 00108714A EP 1050591 A3 EP1050591 A3 EP 1050591A3
Authority
EP
European Patent Office
Prior art keywords
cooling
unalloyed
elongated
workpiece
treatment process
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Withdrawn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
EP00108714A
Other languages
German (de)
French (fr)
Other versions
EP1050591A2 (en
Inventor
Meinert Meyer
Andreas Dr. Peters
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag 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 SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP1050591A2 publication Critical patent/EP1050591A2/en
Publication of EP1050591A3 publication Critical patent/EP1050591A3/en
Withdrawn legal-status Critical Current

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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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • 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
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S148/00—Metal treatment
    • Y10S148/902—Metal treatment having portions of differing metallurgical properties or characteristics

Abstract

Um Wärmebehandlungsverfahren zur Herstellung randschichtgehärteter Lang- oder Flachprodukte, umfassend die Schritte Abkühlen des Werkstücks auf eine Temperatur unterhalb der Martensitstarttemperatur und nachfolgendem langsamen Abkühlen des Kerns dahingehend zu verbessern, daß die Zähigkeitseigenschaften des Werkstücks verbessert werden, wird erfindungsgemäß vorgeschlagen, daß der erste Abkühlprozeß in mehreren, sich wiederholenden Schritten durchgeführt wird, wobei sich jeder Prozeßschritt aus einem Abkühlen auf eine Temperatur unterhalb der Martensitstarttemperatur zur martensitischen Umwandlung nur jeweils eines Teils des Werkstückrandbereichs und einer sich anschließenden zeitlichen Phase zur Entspannung der bereits gebildeten martensitischen Gefügteteile und/oder Randbereiche Martensit/Austenit zusammensetzt.

Figure 00000001
In order to improve heat treatment processes for the production of surface-hardened long or flat products, comprising the steps of cooling the workpiece to a temperature below the martensite start temperature and then slowly cooling the core in such a way that the toughness properties of the workpiece are improved, it is proposed according to the invention that the first cooling process in several , repetitive steps is carried out, each process step consisting of cooling to a temperature below the martensite start temperature for martensitic transformation of only a part of the workpiece edge area and a subsequent time phase for relaxation of the martensitic structural parts and / or edge areas already formed martensite / austenite ,
Figure 00000001
EP00108714A 1999-05-07 2000-04-22 Thermal treatment process for manufacturing surface hardened unalloyed or low alloyed, elongated or flat steel products Withdrawn EP1050591A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19921286A DE19921286A1 (en) 1999-05-07 1999-05-07 Heat treatment process for the production of surface-hardened long and flat products from unalloyed or low-alloy steels
DE19921286 1999-05-07

Publications (2)

Publication Number Publication Date
EP1050591A2 EP1050591A2 (en) 2000-11-08
EP1050591A3 true EP1050591A3 (en) 2004-06-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00108714A Withdrawn EP1050591A3 (en) 1999-05-07 2000-04-22 Thermal treatment process for manufacturing surface hardened unalloyed or low alloyed, elongated or flat steel products

Country Status (4)

Country Link
US (1) US6355119B1 (en)
EP (1) EP1050591A3 (en)
JP (1) JP2000328141A (en)
DE (1) DE19921286A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8968495B2 (en) * 2007-03-23 2015-03-03 Dayton Progress Corporation Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels
US9132567B2 (en) * 2007-03-23 2015-09-15 Dayton Progress Corporation Tools with a thermo-mechanically modified working region and methods of forming such tools
WO2009102848A1 (en) * 2008-02-15 2009-08-20 Dayton Progress Corporation Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels
US8518195B2 (en) * 2012-01-20 2013-08-27 GM Global Technology Operations LLC Heat treatment for producing steel sheet with high strength and ductility
CN106756504B (en) * 2016-12-28 2018-05-15 鞍钢集团（鞍山）铁路运输设备制造有限公司 A kind of ball grinding machine lining board and preparation method thereof
CN107480328B (en) * 2017-07-04 2022-09-20 山东建筑大学 Carbon distribution theory calculation method based on Q & P process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1351423A (en) * 1971-04-14 1974-05-01 Koninklijke Hoogovens En Staal Manufacture of profiled rod
US4016009A (en) * 1975-01-29 1977-04-05 Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie Producing rolled steel products
DE2916218A1 (en) * 1979-04-21 1980-10-23 Florin Stahl Walzwerk Rolled steel prods. with multilayer microstructure - where prod. leaving hot rolling mill is quenched intermittently to obtain several layers of tempered martensite
GB2087927A (en) * 1980-10-16 1982-06-03 Arbed Manufacture of rolled steel products having good weldability, a high elastic limit, and toughness at very low temperatures
US4877463A (en) * 1984-08-23 1989-10-31 Dyckerhoff & Widmann Aktiengesellschaft Method for producing rolled steel products, particularly threaded steel tension members

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180418A (en) * 1973-09-11 1979-12-25 Stahlwerke Peine-Salzgitter A.G. Method of making a steel wire adapted for cold drawing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1351423A (en) * 1971-04-14 1974-05-01 Koninklijke Hoogovens En Staal Manufacture of profiled rod
US4016009A (en) * 1975-01-29 1977-04-05 Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie Producing rolled steel products
DE2916218A1 (en) * 1979-04-21 1980-10-23 Florin Stahl Walzwerk Rolled steel prods. with multilayer microstructure - where prod. leaving hot rolling mill is quenched intermittently to obtain several layers of tempered martensite
GB2087927A (en) * 1980-10-16 1982-06-03 Arbed Manufacture of rolled steel products having good weldability, a high elastic limit, and toughness at very low temperatures
US4877463A (en) * 1984-08-23 1989-10-31 Dyckerhoff & Widmann Aktiengesellschaft Method for producing rolled steel products, particularly threaded steel tension members

Also Published As

Publication number Publication date
EP1050591A2 (en) 2000-11-08
US6355119B1 (en) 2002-03-12
DE19921286A1 (en) 2000-11-09
JP2000328141A (en) 2000-11-28

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