JPS556417A - Method and apparatus for continuous quenching of steel pipe - Google Patents
Method and apparatus for continuous quenching of steel pipeInfo
- Publication number
- JPS556417A JPS556417A JP7681378A JP7681378A JPS556417A JP S556417 A JPS556417 A JP S556417A JP 7681378 A JP7681378 A JP 7681378A JP 7681378 A JP7681378 A JP 7681378A JP S556417 A JPS556417 A JP S556417A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- quenching
- temperature
- surface temperature
- zones
- 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
- C21D9/085—Cooling or quenching
Abstract
PURPOSE:To prevent the generation of quenching crack, by quenching the outer surface of the steel pipe with wall thickness less than 20mm at two or more zones, and by controlling the quenching temperature through the flow rate control for the water. CONSTITUTION:The steel pipe 5 with wall thickness less than about 20mm is heated by the heating furnace 1 to above the austenizing temperature. This steel pipe 5 is passed through the quenching head 2 being divided into two or more zones 2' and is continuously quenched. At the first zone 2', the steel pipe 5 is quickly cooled until the outer surface temperature reaches the Ms point, and at the second zone 2', the pipe 5 is cooled until the inner surface temperature reaches the Mf point, preventing the outer surface temperature from being cooled to under Mf -50 deg.C. That is, the cooling is controlled so as to make small the temperature distribution in the direction of thickness at the martensitic transformation range. According to this method, the unevenness or degradation of quality of material due to the minglement of imperfect quenched structure, are excluded, and the quenching crack is perfectly prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7681378A JPS556417A (en) | 1978-06-24 | 1978-06-24 | Method and apparatus for continuous quenching of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7681378A JPS556417A (en) | 1978-06-24 | 1978-06-24 | Method and apparatus for continuous quenching of steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS556417A true JPS556417A (en) | 1980-01-17 |
Family
ID=13616102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7681378A Pending JPS556417A (en) | 1978-06-24 | 1978-06-24 | Method and apparatus for continuous quenching of steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS556417A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59205418A (en) * | 1983-05-10 | 1984-11-21 | Nippon Steel Corp | Cooling process and device of metal tube |
| JPS6033314A (en) * | 1983-08-03 | 1985-02-20 | Nippon Steel Corp | Method of and apparatus for cooling metallic pipe having difference in level |
| JP2017008372A (en) * | 2015-06-23 | 2017-01-12 | 新日鐵住金株式会社 | Hardening equipment and method for producing steel pipe |
-
1978
- 1978-06-24 JP JP7681378A patent/JPS556417A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59205418A (en) * | 1983-05-10 | 1984-11-21 | Nippon Steel Corp | Cooling process and device of metal tube |
| JPS629163B2 (en) * | 1983-05-10 | 1987-02-26 | Shinnippon Seitetsu Kk | |
| JPS6033314A (en) * | 1983-08-03 | 1985-02-20 | Nippon Steel Corp | Method of and apparatus for cooling metallic pipe having difference in level |
| JPH0349970B2 (en) * | 1983-08-03 | 1991-07-31 | Nippon Steel Corp | |
| JP2017008372A (en) * | 2015-06-23 | 2017-01-12 | 新日鐵住金株式会社 | Hardening equipment and method for producing steel pipe |
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