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 steelInfo
- 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
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.
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)
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 |
-
1979
- 1979-03-26 JP JP3426279A patent/JPS5949283B2/en not_active Expired
Cited By (1)
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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