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JPS5719320A - Heat treatment of spheroidal graphite cast iron - Google Patents

Heat treatment of spheroidal graphite cast iron

Info

Publication number
JPS5719320A
JPS5719320A JP9365980A JP9365980A JPS5719320A JP S5719320 A JPS5719320 A JP S5719320A JP 9365980 A JP9365980 A JP 9365980A JP 9365980 A JP9365980 A JP 9365980A JP S5719320 A JPS5719320 A JP S5719320A
Authority
JP
Japan
Prior art keywords
cast iron
temp
blank material
spheroidal graphite
graphite cast
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.)
Pending
Application number
JP9365980A
Other languages
Japanese (ja)
Inventor
Yukio Fujita
Shinko Kato
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.)
Aisin Takaoka Co Ltd
Original Assignee
Takaoka Industrial Co Ltd
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 Takaoka Industrial Co Ltd filed Critical Takaoka Industrial Co Ltd
Priority to JP9365980A priority Critical patent/JPS5719320A/en
Publication of JPS5719320A publication Critical patent/JPS5719320A/en
Pending 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 Steel (AREA)

Abstract

PURPOSE:To produce a steel of improved hardness, abrasion resistance and fatigue strength by heating a spheroidal graphite cast iron blank material then cooling and normalizing the same, followed by machining and quickly cooling the same down to a prescribed temp. after reheating, thence maintaining the same at that temp. CONSTITUTION:After a spheroidal graphite cast iron blank material having ordinary composition ratios is cast, it is heated to 850-950 deg.C, and is maintained at these temp. for 0.5-5hr according to the differences in wall thickness to allow the carbon in the base to diffuse. Next, the cast iron blank material in this state is allowed to cool in the atmosphere or forcibly cooled, so that the structure is converted to pearlite ground or pearlite ground contg. a small amount of pearlite. Next, this normalized blank material is machined to get rid of deformation and is held for 0.5-5hr at 850-950 deg.C, to austenitize the base. Thereafter, it is immediately hardened in a hot bath of salt or like of 250-400 deg.C, and is maintained at these temp. for >=0.5hr. As a result, the base is turned to bainite structure and the steel of improved hardness, abrasion resistance and fatigue strength of the material is obtained.
JP9365980A 1980-07-09 1980-07-09 Heat treatment of spheroidal graphite cast iron Pending JPS5719320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9365980A JPS5719320A (en) 1980-07-09 1980-07-09 Heat treatment of spheroidal graphite cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9365980A JPS5719320A (en) 1980-07-09 1980-07-09 Heat treatment of spheroidal graphite cast iron

Publications (1)

Publication Number Publication Date
JPS5719320A true JPS5719320A (en) 1982-02-01

Family

ID=14088513

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9365980A Pending JPS5719320A (en) 1980-07-09 1980-07-09 Heat treatment of spheroidal graphite cast iron

Country Status (1)

Country Link
JP (1) JPS5719320A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59157221A (en) * 1983-02-25 1984-09-06 Hitachi Metals Ltd Manufacture of spheroidal graphite cast iron
JPS6024318A (en) * 1983-02-25 1985-02-07 Hitachi Metals Ltd Manufacture of spheroidal graphite cast iron
JPS62253718A (en) * 1986-04-25 1987-11-05 Mazda Motor Corp Production of cast iron part
JPS6456818A (en) * 1987-08-27 1989-03-03 Nissan Motor Manufacture of exhaust parts made of cast iron
US20090320971A1 (en) * 2006-07-03 2009-12-31 Zanardi Fonderie S.P.A. Method for manufacturing spheroidal cast iron mechanical components

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54133420A (en) * 1978-04-07 1979-10-17 Toyo Kogyo Co Heat treatment of nodule iron parts

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54133420A (en) * 1978-04-07 1979-10-17 Toyo Kogyo Co Heat treatment of nodule iron parts

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59157221A (en) * 1983-02-25 1984-09-06 Hitachi Metals Ltd Manufacture of spheroidal graphite cast iron
JPS6024318A (en) * 1983-02-25 1985-02-07 Hitachi Metals Ltd Manufacture of spheroidal graphite cast iron
JPS62253718A (en) * 1986-04-25 1987-11-05 Mazda Motor Corp Production of cast iron part
JPS6456818A (en) * 1987-08-27 1989-03-03 Nissan Motor Manufacture of exhaust parts made of cast iron
US20090320971A1 (en) * 2006-07-03 2009-12-31 Zanardi Fonderie S.P.A. Method for manufacturing spheroidal cast iron mechanical components
US8328965B2 (en) * 2006-07-03 2012-12-11 Zanardi Fonderie S.P.A. Method for manufacturing spheroidal cast iron mechanical components

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