JPS5687625A - Cooling method after tempering of large-diameter steel pipe - Google Patents
Cooling method after tempering of large-diameter steel pipeInfo
- Publication number
- JPS5687625A JPS5687625A JP16385779A JP16385779A JPS5687625A JP S5687625 A JPS5687625 A JP S5687625A JP 16385779 A JP16385779 A JP 16385779A JP 16385779 A JP16385779 A JP 16385779A JP S5687625 A JPS5687625 A JP S5687625A
- Authority
- JP
- Japan
- Prior art keywords
- tempering
- cooling
- steel pipe
- diameter steel
- cooling rate
- 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
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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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 Articles (AREA)
Abstract
PURPOSE:To maintain a good shape and prevent the degradation in toughness by cooling a large-diameter steel pipe at cooling rate below specific rates from tempering temp. down to 600 deg.C, and another specific cooling rate down to 600-400 deg.C, and quickly cooling the same down to ordinary temp. CONSTITUTION:In the case of cooling a large-diameter steel pipe having been subjected to hardening and tempering after tempering, it is cooled at <=2 deg.C/sec. cooling rate from the tempering temp. down to 600 deg.C and 0.4-40 deg.C/sec. cooling rate from 600 down to 400 deg.C, and is quickly cooled from 400 deg.C down to ordinary temp. A goog shape is maintained by the cooling in this manner; in addition, the degradation in toughness owing to temper brittleness is prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16385779A JPS5687625A (en) | 1979-12-17 | 1979-12-17 | Cooling method after tempering of large-diameter steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16385779A JPS5687625A (en) | 1979-12-17 | 1979-12-17 | Cooling method after tempering of large-diameter steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5687625A true JPS5687625A (en) | 1981-07-16 |
Family
ID=15782067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16385779A Pending JPS5687625A (en) | 1979-12-17 | 1979-12-17 | Cooling method after tempering of large-diameter steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5687625A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019112681A (en) * | 2017-12-25 | 2019-07-11 | 日本製鉄株式会社 | Steel, steel pipe for oil well, and method for producing steel |
-
1979
- 1979-12-17 JP JP16385779A patent/JPS5687625A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019112681A (en) * | 2017-12-25 | 2019-07-11 | 日本製鉄株式会社 | Steel, steel pipe for oil well, and method for producing steel |
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