GB812150A - Improved process for the treatment of tough cast iron - Google Patents

Improved process for the treatment of tough cast iron

Info

Publication number
GB812150A
GB812150A GB27389/55A GB2738955A GB812150A GB 812150 A GB812150 A GB 812150A GB 27389/55 A GB27389/55 A GB 27389/55A GB 2738955 A GB2738955 A GB 2738955A GB 812150 A GB812150 A GB 812150A
Authority
GB
United Kingdom
Prior art keywords
per cent
cast iron
treatment
improved process
quenching
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.)
Expired
Application number
GB27389/55A
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of GB812150A publication Critical patent/GB812150A/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
    • C21D5/00—Heat treatments of cast-iron

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 Articles (AREA)

Abstract

Cast iron is obtained by a modification of the process claimed in the parent Specification in which the quenching in the first phase is either a step-quench into oil at 90-110 DEG C. or a direct quench into cold oil. A further modification consists in reducing the time for nucleation treatment to five minutes to three hours when the castings are of thin section or include alloying elements which favour martensitic quenching or graphite uncleation, e.g. Ni (0.4 per cent-2.0 per cent), or Mn (up to 1.3 per cent) for martensitic quenching and Al (0.1 per cent) for graphite nucleation.
GB27389/55A 1954-11-17 1955-09-26 Improved process for the treatment of tough cast iron Expired GB812150A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR812150X 1954-11-17

Publications (1)

Publication Number Publication Date
GB812150A true GB812150A (en) 1959-04-22

Family

ID=9264079

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27389/55A Expired GB812150A (en) 1954-11-17 1955-09-26 Improved process for the treatment of tough cast iron

Country Status (1)

Country Link
GB (1) GB812150A (en)

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