JPS55128532A - Heat treatment for austenite uniform grain refining in low-carbon ni-cr-mo steel - Google Patents

Heat treatment for austenite uniform grain refining in low-carbon ni-cr-mo steel

Info

Publication number
JPS55128532A
JPS55128532A JP3426279A JP3426279A JPS55128532A JP S55128532 A JPS55128532 A JP S55128532A JP 3426279 A JP3426279 A JP 3426279A JP 3426279 A JP3426279 A JP 3426279A JP S55128532 A JPS55128532 A JP S55128532A
Authority
JP
Japan
Prior art keywords
temp
low
area
steel
heat treatment
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
JP3426279A
Other languages
Japanese (ja)
Other versions
JPS5949283B2 (en
Inventor
Masaaki Kano
Kiyoshi Uchida
Tokumi Funakoshi
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP3426279A priority Critical patent/JPS5949283B2/en
Publication of JPS55128532A publication Critical patent/JPS55128532A/en
Publication of JPS5949283B2 publication Critical patent/JPS5949283B2/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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni

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 convert the steel texture to an austenite texture with uniform fine grain effectively, by a method wherein, until a low-carbon Ni-Cr-Mo steel is finally hardened, the heat treatment is repeatedly carried out at a specific temp. CONSTITUTION:A thick steel material comprising a low-carbon Ni-Cr-Mo steel containing C<0.20%, Ni; 3.5-6.5% is heat-treated from a high temp. to a low temp. successively over at least three temp. areas from a low temp. side within the heat treatment of a hereinafter described temp. area before the hardening is carried out from a final hardening temp. Tz(Ac3<Tz<Ac3+80 deg.C). That is, (A) said steel material cooled from an austenite area of a temp. Ty(Ac3+80 deg.C<=Ty<Ac3+120 deg.C) to an alpha-area, (B) cooled from a temp. Tx(Ac3+120 deg.C<=Tx<Ac3+160 deg.C) to an alpha-area, (C) cooled from a temp. Tw(Ac3+160 deg.C<=Tw<Ac3+200 deg.C) to an alpha- area, and (D) cooled from a temp. Tv(Ac3+200 deg.C<=Tv<Ac3+240 deg.C) to an alpha- area. After the heat treatment of (A)-(D) is carried out at least once, the above- described final hardening treatment is carried out to form an austenite grain with a uniform fine grain size.
JP3426279A 1979-03-26 1979-03-26 Uniform austenite grain refinement treatment method for low C-Ni-Cr-Mo steel Expired JPS5949283B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3426279A JPS5949283B2 (en) 1979-03-26 1979-03-26 Uniform austenite grain refinement treatment method for low C-Ni-Cr-Mo steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3426279A JPS5949283B2 (en) 1979-03-26 1979-03-26 Uniform austenite grain refinement treatment method for low C-Ni-Cr-Mo steel

Publications (2)

Publication Number Publication Date
JPS55128532A true JPS55128532A (en) 1980-10-04
JPS5949283B2 JPS5949283B2 (en) 1984-12-01

Family

ID=12409250

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3426279A Expired JPS5949283B2 (en) 1979-03-26 1979-03-26 Uniform austenite grain refinement treatment method for low C-Ni-Cr-Mo steel

Country Status (1)

Country Link
JP (1) JPS5949283B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102021300A (en) * 2010-12-07 2011-04-20 无锡宏达重型锻压有限公司 Grain refinement heat treatment process of large impeller material forging

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102021300A (en) * 2010-12-07 2011-04-20 无锡宏达重型锻压有限公司 Grain refinement heat treatment process of large impeller material forging

Also Published As

Publication number Publication date
JPS5949283B2 (en) 1984-12-01

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