GB846481A - Improvements in and relating to spheroidal graphite cast iron - Google Patents

Improvements in and relating to spheroidal graphite cast iron

Info

Publication number
GB846481A
GB846481A GB9920/57A GB992057A GB846481A GB 846481 A GB846481 A GB 846481A GB 9920/57 A GB9920/57 A GB 9920/57A GB 992057 A GB992057 A GB 992057A GB 846481 A GB846481 A GB 846481A
Authority
GB
United Kingdom
Prior art keywords
nucleation
tempering
cast iron
graphite cast
spheroidal graphite
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
GB9920/57A
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 GB846481A publication Critical patent/GB846481A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

A process of producing spheroidal graphite cast iron castings having analyses within the limits C 2-3%, Si 1-2.5%, Mn 0.6-1.6%, Cu or Ni 0-2%, Al or Ti 0-0.15%, Mg (or an equivalent element) 0.05-0.20%, the balance being Fe, comprises quenching from a temperature above that of eutectoid transformation into oil, water, or a molten salt, nucleation tempering at 400-480 DEG C., and graphitizing annealing at a temperature above that of nucleation tempering for a time sufficient to decompose the primary cementite. The castings may be cooled between the nucleation tempering and the graphitizing anneal. It is stated that the treatment results in the formation of 3,000 to 30,000 spherules of graphite per sq. mm. Specifications 742,399 and 742,400 are referred to.
GB9920/57A 1956-03-30 1957-03-26 Improvements in and relating to spheroidal graphite cast iron Expired GB846481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR846481X 1956-03-30

Publications (1)

Publication Number Publication Date
GB846481A true GB846481A (en) 1960-08-31

Family

ID=9313351

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9920/57A Expired GB846481A (en) 1956-03-30 1957-03-26 Improvements in and relating to spheroidal graphite cast iron

Country Status (1)

Country Link
GB (1) GB846481A (en)

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