JPS6431920A - Method for preventing decarbonization after spheroidizing heat treatment and heat treating furnace - Google Patents

Method for preventing decarbonization after spheroidizing heat treatment and heat treating furnace

Info

Publication number
JPS6431920A
JPS6431920A JP18955487A JP18955487A JPS6431920A JP S6431920 A JPS6431920 A JP S6431920A JP 18955487 A JP18955487 A JP 18955487A JP 18955487 A JP18955487 A JP 18955487A JP S6431920 A JPS6431920 A JP S6431920A
Authority
JP
Japan
Prior art keywords
heat treatment
cooling
temp
spheroidizing
spheroidizing heat
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
JP18955487A
Other languages
Japanese (ja)
Inventor
Mitsuo Uno
Takeo Yamagata
Shoji Nishimura
Hajime Yoshikawa
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP18955487A priority Critical patent/JPS6431920A/en
Publication of JPS6431920A publication Critical patent/JPS6431920A/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods

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)

Abstract

PURPOSE:To prevent decarbonization during cooling process after discharging a steel from a heat treatment furnace and to restrain deterioration of quality, such as lowering of fatigue resistance of the steel by specifying starting temp. of forced cooling and cooling speed to the specific temp. after completing spheroidizing heat treatment. CONSTITUTION:In the spheroidizing heat treatment of the steel, after completing the spheroidizing heat treatment, the starting temp. of forced cooling is to be in the range of the temp. from the Ar1 transformation point to Ar1 point -10 deg.C and is cooled at >=0.1 deg.C/sec cooling speed with the coolant to the Ar1 point -100 deg.C. For this purpose, the heat treatment furnace arranging forced cooling equipment with the coolant continuously connected with the spheroidizing heat treatment furnace, is used. For example, wire rod coil 1 as material to be cooled is carried and spheroidized in the spheroidizing heat treatment furnace 4. The treated wire rod coil 1 sis held in N2 gas atmosphere in a gas exchanging chamber 7 and after the coil 1 is lowered to the prescribed starting temp. for rapid cooling, the coil is dipped into the water cooling pit 13 with a hoist 12 and after cooling to the prescribed finishing temp. for cooling, it is lifted up and carried to out of the furnace.
JP18955487A 1987-07-28 1987-07-28 Method for preventing decarbonization after spheroidizing heat treatment and heat treating furnace Pending JPS6431920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18955487A JPS6431920A (en) 1987-07-28 1987-07-28 Method for preventing decarbonization after spheroidizing heat treatment and heat treating furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18955487A JPS6431920A (en) 1987-07-28 1987-07-28 Method for preventing decarbonization after spheroidizing heat treatment and heat treating furnace

Publications (1)

Publication Number Publication Date
JPS6431920A true JPS6431920A (en) 1989-02-02

Family

ID=16243269

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18955487A Pending JPS6431920A (en) 1987-07-28 1987-07-28 Method for preventing decarbonization after spheroidizing heat treatment and heat treating furnace

Country Status (1)

Country Link
JP (1) JPS6431920A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05105964A (en) * 1991-10-09 1993-04-27 Nippon Steel Corp Carrying line equipment enabling tempering treatment during carry of wire rod coil and tempering heat treatment method during carry of same coil
JPH06145793A (en) * 1992-10-29 1994-05-27 Sumitomo Metal Ind Ltd Method for preventing decarburization of seamless steel tube
JPH0790388A (en) * 1993-09-22 1995-04-04 Ishikawajima Harima Heavy Ind Co Ltd Heat treatment furnace for round steel coil
KR100699133B1 (en) * 2005-10-07 2007-03-22 동부제강주식회사 Manufacturing method of normalizing-treated free-cutting steel wire rod excellent in working
CN102876858A (en) * 2012-09-20 2013-01-16 洛阳鼎辉特钢制品股份有限公司 Spheroidizing annealing process of GCr15 ball bearing steels based on severe-convection protective gas

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05105964A (en) * 1991-10-09 1993-04-27 Nippon Steel Corp Carrying line equipment enabling tempering treatment during carry of wire rod coil and tempering heat treatment method during carry of same coil
JPH06145793A (en) * 1992-10-29 1994-05-27 Sumitomo Metal Ind Ltd Method for preventing decarburization of seamless steel tube
JPH0790388A (en) * 1993-09-22 1995-04-04 Ishikawajima Harima Heavy Ind Co Ltd Heat treatment furnace for round steel coil
KR100699133B1 (en) * 2005-10-07 2007-03-22 동부제강주식회사 Manufacturing method of normalizing-treated free-cutting steel wire rod excellent in working
CN102876858A (en) * 2012-09-20 2013-01-16 洛阳鼎辉特钢制品股份有限公司 Spheroidizing annealing process of GCr15 ball bearing steels based on severe-convection protective gas

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