EP0418506A1 - Procédé pour tremper de l'acier au moyen de milieux refroidissement liquides - Google Patents

Procédé pour tremper de l'acier au moyen de milieux refroidissement liquides Download PDF

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Publication number
EP0418506A1
EP0418506A1 EP90114203A EP90114203A EP0418506A1 EP 0418506 A1 EP0418506 A1 EP 0418506A1 EP 90114203 A EP90114203 A EP 90114203A EP 90114203 A EP90114203 A EP 90114203A EP 0418506 A1 EP0418506 A1 EP 0418506A1
Authority
EP
European Patent Office
Prior art keywords
temperature
cooling
section
steel
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.)
Ceased
Application number
EP90114203A
Other languages
German (de)
English (en)
Inventor
Meinert Meyer
Uwe Plociennik
Manfred Albedyhl
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 EP0418506A1 publication Critical patent/EP0418506A1/fr
Ceased 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
    • 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

Definitions

  • the invention relates to a method for hardening steel with the aid of liquid cooling media, in particular for hardening rod-shaped rolled products made of alloyed and unalloyed tempered steel with relatively large diameters, directly after the rolling process.
  • German Patent 24 26 920 a method for producing weldable steel bars from a steel with a low carbon content is known, according to which the rolling stock is subjected to a single or repeated water cooling and subsequent cooling in still air immediately after the last rolling process.
  • This one-time or even multiple cooling of the rod-shaped rolling stock in water and in still air is intended to improve the microstructure, in particular a sufficient tempering structure in the edge zone of the steel bar and a conversion to a microstructure with higher strength in the steel bar core.
  • This known method for producing weldable bar steel requires on Due to the repeated, successive cooling processes in the water and in the air, not only is it a relatively high expenditure of energy, time and costs, but it can only be a small one with this process even for steel rods with small rod diameters (e.g. 10-20 mm) , hardening depth related to the edge zone can be achieved. In addition, this process is limited to the manufacture of weldable, low carbon steel bars.
  • the object of the invention is to provide a method for hardening steel, which not only enables a considerable increase in the hardening depth in the steel of any type and of any size, but also a through hardening, in particular of rod-shaped rolled products made of steel allows relatively large diameters in a simple manner.
  • the rolled product made of steel is fed to a cooling section provided with cooling media immediately after the rolling process and is exposed therein to high flow velocities. Due to the fact that the rolled product is exposed to high flow velocities in the cooling section, which can be designed, for example, as an elongated trough or as an elongated channel, the outer surface of the rolled product is brought together with constantly new cooling medium in fractions of a second and thereby the heat dissipation and the associated therewith The cooling rate of the rolled product is accelerated considerably.
  • the flow velocities in the cooling section are so high that heat transfer numbers greater than or equal to 50,000 W / m2 / K are generated and are cooled therein until the average temperature of the rolling stock cross-section is below the MS temperature, so that after leaving the cooling section through the temperature compensation over the cross section, the austenite still present in the core is converted into intermediate stage structure (bainite), while at the same time a large part of the superimposed thermal and transformation stresses in the martensitic marginal zone by increasing the temperature to a maximum of MS temperature is broken down. In this way, the risk of cracking is avoided with great advantage.
  • the rolled product is particularly expediently cooled in the cooling section until the temperature of the entire cross section is below the MS temperature, so that the core zone also becomes martensitic.
  • the through-hardened rolled product is tempered in an additional heat treatment to a temperature required for further processing.
  • Steel can advantageously be hardened according to the invention either in such a way that the rolled product is transported at high speed through the cooling medium located in the cooling section, or that the rolled product is immersed in the medium located in the cooling section and the cooling medium is moved at high speed - Rinsing the rolled product on all sides - is moved through the cooling section.
  • the same cooling effect and hardening of the steel according to the invention can be achieved with both methods. It is only necessary to decide on a case-by-case basis, in particular in the case of existing plants and rolling mills, which hardening method can be integrated most quickly and easily into the material flow of the existing rolling mills and post-treatment plants.
  • water with high effectiveness is preferably used as the cooling and quenching medium for hardening steel.
  • other liquids such as oil, ice water, salt solutions or the like for hardening steel instead of water as the cooling and quenching medium, but these cooling and quenching media for hardening steel will only be used in special cases when the water as a cooling and quenching medium does not lead to the desired results.
  • the measures according to the invention are not limited to the exemplary embodiment shown in the diagrams.
  • any alloyed and unalloyed tempering steels can be treated according to the invention without departing from the scope of the invention.
  • the type of cooling treatment and the structural design of the cooling section in adaptation to the specific area of application is left to the person skilled in the art.
  • the measures according to the invention achieve a hitherto unprecedented depth of hardening or even complete hardening down to the core of the steel product with considerably less energy and cost compared to the known methods.

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  • 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 Articles (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP90114203A 1989-08-18 1990-07-25 Procédé pour tremper de l'acier au moyen de milieux refroidissement liquides Ceased EP0418506A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893927276 DE3927276A1 (de) 1989-08-18 1989-08-18 Verfahren zum haerten von stahl mit hilfe fluessiger kuehlmedien
DE3927276 1989-08-18

Publications (1)

Publication Number Publication Date
EP0418506A1 true EP0418506A1 (fr) 1991-03-27

Family

ID=6387361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90114203A Ceased EP0418506A1 (fr) 1989-08-18 1990-07-25 Procédé pour tremper de l'acier au moyen de milieux refroidissement liquides

Country Status (3)

Country Link
EP (1) EP0418506A1 (fr)
JP (1) JPH0387312A (fr)
DE (1) DE3927276A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0798390A1 (fr) * 1996-03-30 1997-10-01 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour refroidir des profilés en acier chauds après laminage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19718530B4 (de) * 1997-05-02 2005-02-03 Sms Demag Ag Verfahren zum Kühlen von walzwarmem Walzgut und Vorrichtung zur Durchführung des Verfahrens und Verwendung der Vorrichtung
DE19850739A1 (de) * 1998-11-04 2000-05-11 Schloemann Siemag Ag Verfahren und Vorrichtung zum Kühlen von walzwarmem Walzgut, insbesondere Warmbreitband

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE904294C (de) * 1951-03-25 1954-02-18 Wilhelm Stich Dipl Ing Dr Verfahren und Vorrichtung zum Walzhaerten unmittelbar aus dem Fertigkaliber, und zwar bei groesserer Walzgeschwindigkeit und Walzader- bzw. Haeterohrlaenge
DE907532C (de) * 1944-04-04 1954-03-25 Deutsche Edelstahlwerke Ag Zwischenstufenverguetung von unlegierten und legierten Staehlen
DD119270A1 (fr) * 1975-04-02 1976-04-12
EP0053507A1 (fr) * 1980-12-02 1982-06-09 British Steel Corporation Procédé de fabrication de ronds et barres en acier contenant du nickel
EP0090682A2 (fr) * 1982-03-03 1983-10-05 Institut De Recherches De La Siderurgie Francaise (Irsid) Procédé et installation de traitement thermique de barres en acier allié prêtes à l'emploi
DE2426920C2 (de) * 1973-06-04 1983-12-29 ESTEL HOOGOVENS B.V., 1970 Ijmuiden Verfahren zum Herstellen von schweißbarem Stabstahl und Verwendung des Verfahrens

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD253581B3 (de) * 1986-11-14 1992-11-19 Thaelmann Schwermaschbau Veb Einrichtung zur abkuehlung von walzgut in wasserkuehlstrecken

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE907532C (de) * 1944-04-04 1954-03-25 Deutsche Edelstahlwerke Ag Zwischenstufenverguetung von unlegierten und legierten Staehlen
DE904294C (de) * 1951-03-25 1954-02-18 Wilhelm Stich Dipl Ing Dr Verfahren und Vorrichtung zum Walzhaerten unmittelbar aus dem Fertigkaliber, und zwar bei groesserer Walzgeschwindigkeit und Walzader- bzw. Haeterohrlaenge
DE2426920C2 (de) * 1973-06-04 1983-12-29 ESTEL HOOGOVENS B.V., 1970 Ijmuiden Verfahren zum Herstellen von schweißbarem Stabstahl und Verwendung des Verfahrens
DD119270A1 (fr) * 1975-04-02 1976-04-12
EP0053507A1 (fr) * 1980-12-02 1982-06-09 British Steel Corporation Procédé de fabrication de ronds et barres en acier contenant du nickel
EP0090682A2 (fr) * 1982-03-03 1983-10-05 Institut De Recherches De La Siderurgie Francaise (Irsid) Procédé et installation de traitement thermique de barres en acier allié prêtes à l'emploi

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-A-O 794 / VIa veröffentlicht 05.03.1953, Oberhütten *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0798390A1 (fr) * 1996-03-30 1997-10-01 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour refroidir des profilés en acier chauds après laminage
KR970065739A (ko) * 1996-03-30 1997-10-13 귄터 플레밍, 빌프리트 발트 롤러 가온된 강 프로필의 냉각방법
CN1067111C (zh) * 1996-03-30 2001-06-13 Sms舒路曼-斯玛公司 冷却因轧制而为热态的钢的型材的方法

Also Published As

Publication number Publication date
DE3927276A1 (de) 1991-02-21
JPH0387312A (ja) 1991-04-12

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