EP0798390A1 - Verfahren zur Kühlung walzwarmer Stahlprofile - Google Patents

Verfahren zur Kühlung walzwarmer Stahlprofile Download PDF

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Publication number
EP0798390A1
EP0798390A1 EP97104338A EP97104338A EP0798390A1 EP 0798390 A1 EP0798390 A1 EP 0798390A1 EP 97104338 A EP97104338 A EP 97104338A EP 97104338 A EP97104338 A EP 97104338A EP 0798390 A1 EP0798390 A1 EP 0798390A1
Authority
EP
European Patent Office
Prior art keywords
cooling
steel
surface layer
shock
steels
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
EP97104338A
Other languages
German (de)
English (en)
French (fr)
Inventor
Meinert Meyer
Rainer Kholmann
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 EP0798390A1 publication Critical patent/EP0798390A1/de
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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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

Definitions

  • the invention relates to a method for cooling warm-rolled steel profiles by means of shock-like cooling following the rolling process with the formation of a martensitic surface layer and subsequent autogenous tempering of this surface layer by means of nuclear heat to form a tough, resistant structure with an austenitic residual cross section.
  • Some types of steel are very inert due to the alloying elements they contain, for example from the group Cr, Mn, Mo, Ni and other suitable elements, i.e. the transformation from the austenite phase after hot forming into ferrite or pearlite takes place only after long holding times at a corresponding temperature interval between 600 and 750 ° C.
  • the invention has for its object to avoid this costly technical effort and at the same time to ensure that the air-hardening steels after hot forming and cooling to room temperature free of cracks and breaks in a suitable delivery condition of their structure for further processing can be used for other purposes.
  • the hot-rolled product is passed through a cooling section to which water is applied immediately after the forming process, a thin edge zone being cooled in such a way that it converts martensitic. After exiting the cooling section, this martensitic surface layer is left autogenous by residual heat of the rolling wire, so that a very tough and high stress-absorbing surface layer is created, which prevents damage to the product in the form of cracks or when the existing austenite is converted into martensite Breaks occur.
  • the shock-like cooling is preferably carried out with a heat transfer coefficient of alpha> 20, preferably up to 80 KW / m 2 / K.
  • the invention gives the great advantage that for steel from the group of air hardeners, the complex devices which are usually to be provided in the prior art for cooling with an extremely great delay can be dispensed with. This results in a significant increase in Economy in the cooling process and an increase in productivity due to shorter cooling times.
  • One embodiment of the invention provides that the shock-like cooling with the formation of the martensitic surface layer is carried out with a start of cooling exactly defined by a predetermined starting temperature after the dynamic recrystallization with a cooling process that can be predetermined by comparative tests up to a defined cooling temperature in a water cooling section arranged behind the rolling train.
  • a continuation of the method provides that the cooling process of the steel profile ends after tempering the martensitic edge zone, the steel profile is conveyed through the further processing devices, then deposited and only when called up at a later point in time by a targeted heat treatment into a customer-specified one Structural state is brought for delivery.
  • a further embodiment of the method provides that the roll core produces order-specific partial lengths, collects them into bundles at a temperature below possible carbide precipitation phases, further cools them down at a cooling rate of ⁇ 1K / min, and austenites still present during the further conversion stress-free conversion into self-tempered martensite is carried out.
  • the steel can pass through the units provided for low and / or unalloyed steels for further processing to a defined delivery state. This has the advantage that independent, costly additional devices are no longer required for this.
  • the steel cooled to room temperature can then be subjected to the usual handling in further processing without stress cracks or material breaks occurring.
  • the method for cooling warm-rolled steel profiles of a steel grade known as air hardener with alloy elements from the group Cr, Mn, Mo, Ni, V and other suitable elements is preferably suitable for its use on round material with diameters ⁇ 100 mm.
  • the example diagram shows the course of temperature and cooling time for an air hardener with temperature curves for the peripheral zone (1), for the core area (2) and for the average temperature (3).
  • the sample leaves the last roll stand at a rolling temperature of approximately 960 ° C.
  • the dynamic recrystallization has completely completed before entering the cooling section.
  • the surface temperature (1) cooling from 920 ° C. to about 200 ° C. within about two seconds and further between about the 15th and the 23rd second 70 ° C is lowered.
  • the core temperature (2) drops much more slowly and reaches approx. 870 ° C in the 35th second and approx. 640 ° C by the 80th second.
  • the average temperature (3) drops from the 14th and up to the 23rd second from 940 ° C to approx. 640 ° C and from there steadily approaches to approx. 620 ° C.
  • the temperature of the edge zone (1) rises steeply in an exponential function after leaving the cooling section by supplying heat from the core cross section and reaches a temperature of approx. 610 ° C. by the 80th second.
  • a tempering process forms a very tough and resistant surface layer in the edge zone, which surrounds the initially austenitic residual cross-section like a protective layer and prevents damage such as cracks or breaks from occurring to the material when the residual austenite is later converted into martensite.
  • the process is straightforward and only requires an exactly reproducible and controlled, accelerated cooling of air-hardening alloy steels, avoiding the need for State of the art for air hardeners previously required complex devices for cooling with a strong delay.
  • the invention thus optimally fulfills the task set out above.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP97104338A 1996-03-30 1997-03-14 Verfahren zur Kühlung walzwarmer Stahlprofile Ceased EP0798390A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19612818 1996-03-30
DE19612818A DE19612818C2 (de) 1996-03-30 1996-03-30 Verfahren zur Kühlung walzwarmer Stahlprofile

Publications (1)

Publication Number Publication Date
EP0798390A1 true EP0798390A1 (de) 1997-10-01

Family

ID=7790032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97104338A Ceased EP0798390A1 (de) 1996-03-30 1997-03-14 Verfahren zur Kühlung walzwarmer Stahlprofile

Country Status (8)

Country Link
US (1) US5830293A (zh)
EP (1) EP0798390A1 (zh)
JP (1) JPH1024317A (zh)
KR (1) KR970065739A (zh)
CN (1) CN1067111C (zh)
CA (1) CA2200258A1 (zh)
DE (1) DE19612818C2 (zh)
TW (1) TW346506B (zh)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1007739C2 (nl) * 1997-12-08 1999-06-09 Hoogovens Staal Bv Werkwijze en inrichting voor het vervaardigen van een stalen band met hoge sterkte.
DE102009015862A1 (de) * 2009-04-01 2010-10-07 Siemens Aktiengesellschaft Getriebeverdichterrotor für Kaltgasanwendungen
US9822422B2 (en) 2009-09-24 2017-11-21 Ati Properties Llc Processes for reducing flatness deviations in alloy articles
DE102011051682B4 (de) * 2011-07-08 2013-02-21 Max Aicher Verfahren und Vorrichtung zum Behandeln eines Stahlprodukts sowie Stahlprodukt
BR112015005440B1 (pt) 2012-09-13 2019-07-30 Jfe Steel Corporation Chapa de aço laminada a quente e método para fabricar a mesma
CN104619876B (zh) * 2012-09-13 2016-12-21 杰富意钢铁株式会社 热轧钢板及其制造方法
CN105618481B (zh) * 2016-03-15 2017-04-26 石家庄钢铁有限责任公司 一种连铸坯凸辊余热轧制设备及工艺
CN110763612B (zh) * 2018-07-25 2022-10-11 中国石油化工股份有限公司 一种研究马氏体对奥氏体钢应力腐蚀开裂性能影响的方法
DE102019215053A1 (de) * 2019-09-30 2021-04-01 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines zumindest teilweise vergüteten Stahlblechbauteils und zumindest teilweise vergütetes Stahlblechbauteil

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE715141C (de) * 1937-08-13 1941-12-16 Hoesch Ag Verfahren zur Verbesserung der Tiefziehfaehigkeit von nicht lufthaertenden rostfreien Chromstaehlen
DE1243401B (de) * 1963-09-13 1967-06-29 Timken Roller Bearing Co Lufthaertender Lagerstahl
DE2242388B1 (de) * 1972-08-29 1974-03-07 Stahlwerke Suedwestfalen Ag, 5930 Huettental-Geisweid Verfahren zur Behandlung von Stabstahl aus der Walzhitze
DE2612918A1 (de) * 1975-04-02 1976-10-21 Florin Stahl Walzwerk Verfahren zur herstellung von walzstahlerzeugnissen mit entfestigter randzone und hochfestem kern
EP0418506A1 (de) * 1989-08-18 1991-03-27 Sms Schloemann-Siemag Aktiengesellschaft Verfahren zum Härten von Stahl mit Hilfe flüssiger Kühlmedien

Family Cites Families (8)

* 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
IT1090143B (it) * 1975-01-29 1985-06-18 Centre Rech Metallurgique Procedimento per fabbricare dei prodotti laminati di acciaio
JPS55107734A (en) * 1979-02-14 1980-08-19 Sumitomo Metal Ind Ltd Manufacture of high tensile steel wire rod
JPS57126913A (en) * 1981-01-27 1982-08-06 Kobe Steel Ltd Production of high-toughness high-strength wire or rod steel
DD234281B1 (de) * 1984-12-21 1989-06-21 Florin Stahl Walzwerk Verfahren zur druckwasserabschreckung von walzstahlerzeugnissen
NL193218C (nl) * 1985-08-27 1999-03-03 Nisshin Steel Company Werkwijze voor de bereiding van roestvrij staal.
JPH076713B2 (ja) * 1987-07-15 1995-01-30 三洋電機株式会社 低温ショ−ケ−スの複数台運転回路
JPH04154921A (ja) * 1990-10-16 1992-05-27 Nisshin Steel Co Ltd 形状の優れた高強度ステンレス鋼帯の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE715141C (de) * 1937-08-13 1941-12-16 Hoesch Ag Verfahren zur Verbesserung der Tiefziehfaehigkeit von nicht lufthaertenden rostfreien Chromstaehlen
DE1243401B (de) * 1963-09-13 1967-06-29 Timken Roller Bearing Co Lufthaertender Lagerstahl
DE2242388B1 (de) * 1972-08-29 1974-03-07 Stahlwerke Suedwestfalen Ag, 5930 Huettental-Geisweid Verfahren zur Behandlung von Stabstahl aus der Walzhitze
DE2612918A1 (de) * 1975-04-02 1976-10-21 Florin Stahl Walzwerk Verfahren zur herstellung von walzstahlerzeugnissen mit entfestigter randzone und hochfestem kern
EP0418506A1 (de) * 1989-08-18 1991-03-27 Sms Schloemann-Siemag Aktiengesellschaft Verfahren zum Härten von Stahl mit Hilfe flüssiger Kühlmedien

Also Published As

Publication number Publication date
KR970065739A (ko) 1997-10-13
CN1172858A (zh) 1998-02-11
US5830293A (en) 1998-11-03
DE19612818C2 (de) 1998-04-09
CA2200258A1 (en) 1997-10-01
JPH1024317A (ja) 1998-01-27
CN1067111C (zh) 2001-06-13
DE19612818A1 (de) 1997-10-02
TW346506B (en) 1998-12-01

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