EP1031631A2 - Verfahren zum Glühen auf kugeligem Carbide von untereutektoidischen niedriglegierten Stählen - Google Patents

Verfahren zum Glühen auf kugeligem Carbide von untereutektoidischen niedriglegierten Stählen Download PDF

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Publication number
EP1031631A2
EP1031631A2 EP00850027A EP00850027A EP1031631A2 EP 1031631 A2 EP1031631 A2 EP 1031631A2 EP 00850027 A EP00850027 A EP 00850027A EP 00850027 A EP00850027 A EP 00850027A EP 1031631 A2 EP1031631 A2 EP 1031631A2
Authority
EP
European Patent Office
Prior art keywords
temperature
hypo
eutectoid
until
ferrite
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Withdrawn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
EP00850027A
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English (en)
French (fr)
Other versions
EP1031631A3 (de
Inventor
Thore Lund
Staffan Larsson
Patrik Ölund
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.)
Ovako Steel AB
Original Assignee
Ovako Steel AB
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 Ovako Steel AB filed Critical Ovako Steel AB
Publication of EP1031631A2 publication Critical patent/EP1031631A2/de
Publication of EP1031631A3 publication Critical patent/EP1031631A3/de
Withdrawn legal-status Critical Current

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    • 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
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • 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
    • C21D1/78—Combined heat-treatments not provided for above
    • C21D1/785—Thermocycling
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising

Definitions

  • the present invention relates to a method of spheroidizing annealing of hypo-eutectoid low alloy steel, and more specifically to a method of heat treatment of hypo-eutectoid low alloy steel for obtaining a desired amount of spherical carbides in a ferritic matrix in order to enhance the cold forming characteristics of the steel.
  • low and medium carbon steels are normally delivered having a mixed structure comprising perlite and ferrite, sometimes bainite and/or martensite, tempered or not. This may lead to problems in machining and/or cold deformation. In turning processes this is experienced as heavy wear of the tools and in cold deforming processes unwanted cracks in the treated objects occur.
  • the two conventional heat treatment methods currently used for softening steels do not result in spheroidisation of low or medium carbon steel.
  • Spherodizing annealing of high carbon steel is one of the conventional heat treatment methods giving a perlite structure, and the other is tempering at about 700°C of low carbon steel, which gives perlite and non-spherical carbides.
  • the object of the invention is to provide a method for spheroidizing annealing of hypo-eutectoid low alloy steel resulting in improved cold forming characteristics and machinability.
  • a) and b) are repeated at least twice. This will decrease the material grain size and thus increase the diffusion rate and reduce the diffusion distances of alloying elements. This could be necessary in order to successfully anneal a hypo-eutectoide steel with a low amount of carbide forming elements.
  • Fig. 1 illustrates one embodiment of the spheroidizing annealing method according to the invention for low and medium carbon steels (Ovako 234, 0.2 wt.% C).
  • Fig. 2 illustrates second embodiment of the method according to the invention, for low and medium carbon steel (Ovako 593, 0.5 wt.% C, 157, 245, och 255, 0.2 wt.% C.
  • Fig. 3 illustrates a third embodiment of the method according to the invention for low and medium carbon steels (Ovako 593, 0.5 wt.% C) 157, 245 and 255, 0.2 wt.% C.
  • Products produced and delivered to a customer can be divided into three different categories related to the final treatment before delivery:
  • FIG. 1 A graph illustrating the method is shown in Fig. 1.
  • the steel grade Ovako 234 with about 0.2 wt.% C was treated with the method according to the invention, by raising the temperature to between A1 and A3, in this case about 740°C, and maintaining the temperature for a prolonged time, lowering the temperature to underneath A1 and then holding the temperature until the desired degree of spheroidization has been obtained.
  • FIG. 2 A graph illustrating this embodiment of the method is shown in Fig. 2.
  • the following steel grades were tested: Ovako 593 with about 0.5 wt.% C, and Ovako 157, 245, and 255 with about 0.2 wt.% C.
  • the temperature was increased to between A1 and A3, in this case about 740°C, this temperature was maintained for about one hour, then lowered to well below A1, i.e. about 600°C, and then increased again to about 670°C and maintained there until the desired degree of spheroidization was obtained.

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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 Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP00850027A 1999-02-22 2000-02-14 Verfahren zum Glühen auf kugeligem Carbide von untereutektoidischen niedriglegierten Stählen Withdrawn EP1031631A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9900598 1999-02-22
SE9900598A SE521770C2 (sv) 1999-02-22 1999-02-22 Sfäroidiserande glödgning av undereutektisk låglegerat stål

Publications (2)

Publication Number Publication Date
EP1031631A2 true EP1031631A2 (de) 2000-08-30
EP1031631A3 EP1031631A3 (de) 2003-10-08

Family

ID=20414556

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00850027A Withdrawn EP1031631A3 (de) 1999-02-22 2000-02-14 Verfahren zum Glühen auf kugeligem Carbide von untereutektoidischen niedriglegierten Stählen

Country Status (4)

Country Link
EP (1) EP1031631A3 (de)
JP (1) JP2000239737A (de)
CN (1) CN1265427A (de)
SE (1) SE521770C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2543744A1 (de) * 2011-07-08 2013-01-09 Aicher, Max Verfahren und Vorrichtung zum Behandeln eines Stahlprodukts sowie Stahlprodukt
CZ305540B6 (cs) * 2014-05-21 2015-11-25 Západočeská Univerzita V Plzni Způsob tepelného zpracování vysokolegované oceli

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100348742C (zh) * 2006-03-14 2007-11-14 钢铁研究总院 一种防弹头盔用深冲钢板的球化退火处理工艺
KR100653134B1 (ko) * 2006-04-25 2006-12-04 광진실업 주식회사 전기유도 가열장치를 이용한 중탄소강 강봉의 구상화 소둔 방법
CN102226228B (zh) * 2011-06-08 2013-06-19 马鞍山钢铁股份有限公司 一种中间相退火球化中低碳钢组织中珠光体的试验工艺
CN106755852A (zh) * 2016-11-30 2017-05-31 中国船舶重工集团公司第十二研究所 一种合金钢低硬度软化方法
CN107723435B (zh) * 2017-11-30 2023-06-06 贵州大学 在亚共析钢线材中获得细化的全珠光体组织的方法及装置
CN109628713B (zh) * 2018-12-12 2020-11-06 河钢股份有限公司承德分公司 一种低碳号钢的球化退火方法
CN109517949B (zh) * 2018-12-12 2020-10-30 河钢股份有限公司承德分公司 一种轴类用钢的球化退火方法
CN109593929B (zh) * 2018-12-12 2020-10-30 河钢股份有限公司承德分公司 一种冷镦钢的球化退火方法
CN109487052B (zh) * 2018-12-12 2020-10-30 河钢股份有限公司承德分公司 一种含b冷镦钢的球化退火方法
CN115013601B (zh) * 2022-07-01 2023-11-07 江苏徐工工程机械研究院有限公司 混凝土输送管及其制造方法和混凝土泵车

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4322256A (en) * 1979-01-31 1982-03-30 Snap-On Tools Corporation Tool made from alloy steel for severe cold forming
RU2023026C1 (ru) * 1991-07-02 1994-11-15 Украинский государственный научно-исследовательский институт металлов Способ термической обработки рельсов

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2543744A1 (de) * 2011-07-08 2013-01-09 Aicher, Max Verfahren und Vorrichtung zum Behandeln eines Stahlprodukts sowie Stahlprodukt
CZ305540B6 (cs) * 2014-05-21 2015-11-25 Západočeská Univerzita V Plzni Způsob tepelného zpracování vysokolegované oceli

Also Published As

Publication number Publication date
EP1031631A3 (de) 2003-10-08
SE521770C2 (sv) 2003-12-02
SE9900598D0 (sv) 1999-02-22
SE9900598L (sv) 2000-08-23
CN1265427A (zh) 2000-09-06
JP2000239737A (ja) 2000-09-05

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