GB2005312A - Modifying the microstructure of steel sections by multi-stage cooling - Google Patents

Modifying the microstructure of steel sections by multi-stage cooling

Info

Publication number
GB2005312A
GB2005312A GB7837343A GB7837343A GB2005312A GB 2005312 A GB2005312 A GB 2005312A GB 7837343 A GB7837343 A GB 7837343A GB 7837343 A GB7837343 A GB 7837343A GB 2005312 A GB2005312 A GB 2005312A
Authority
GB
United Kingdom
Prior art keywords
cooling
steel sections
austenite
microstructure
modifying
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.)
Granted
Application number
GB7837343A
Other versions
GB2005312B (en
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.)
IN DE METALLURG
RES METALLURG CT VOOR RESEARCH
Original Assignee
IN DE METALLURG
RES METALLURG CT VOOR RESEARCH
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 IN DE METALLURG, RES METALLURG CT VOOR RESEARCH filed Critical IN DE METALLURG
Publication of GB2005312A publication Critical patent/GB2005312A/en
Application granted granted Critical
Publication of GB2005312B publication Critical patent/GB2005312B/en
Expired 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
    • 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
    • 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

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)
  • Metal Rolling (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The elastic limit and breaking load of steel sections are improved by a process of surface hardening and self-tempering comprising a cooling stage which converts the surface region to austenite and ferrite. This is followed by a rapid hardening cooling which converts that austenite to martensite/bauxite and is interrupted to allow the surface layer of the section to be tempered by non-hardened inner portions of the section. The rapid cooling is succeeded by a slow cooling, whereby core austenite transforms to ferrite and carbide.
GB7837343A 1977-09-19 1978-09-19 Process for the quality of steel section Expired GB2005312B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE6046151A BE858862A (en) 1977-09-19 1977-09-19 PROCESS FOR IMPROVING THE QUALITY OF STEEL PROFILES

Publications (2)

Publication Number Publication Date
GB2005312A true GB2005312A (en) 1979-04-19
GB2005312B GB2005312B (en) 1982-02-24

Family

ID=3874753

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7837343A Expired GB2005312B (en) 1977-09-19 1978-09-19 Process for the quality of steel section

Country Status (4)

Country Link
JP (1) JPS5843447B2 (en)
BE (1) BE858862A (en)
DE (1) DE2840193A1 (en)
GB (1) GB2005312B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7809463A (en) * 1977-09-19 1979-03-21 Centre Rech Metallurgique PROCESS FOR IMPROVING THE QUALITY OF STEEL PROFILES.
BE1005964A6 (en) * 1992-06-29 1994-04-05 Centre Rech Metallurgique Protection method of hot rolled steel product.
JP4581645B2 (en) * 2004-11-22 2010-11-17 Ｊｆｅスチール株式会社 Manufacturing method of thin web high strength H-section steel
JP4817898B2 (en) * 2006-03-14 2011-11-16 トピー工業株式会社 Heat treatment apparatus and heat treatment method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543750A1 (en) * 1974-10-04 1976-04-15 Centre Rech Metallurgique Cooling and drying box for metal strip - to sharply cool the strip during rolling

Also Published As

Publication number Publication date
DE2840193A1 (en) 1979-03-29
JPS5843447B2 (en) 1983-09-27
GB2005312B (en) 1982-02-24
BE858862A (en) 1978-01-16
JPS5454911A (en) 1979-05-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee