JPS5576014A - Heat treating method of steel material having rolling scale and heat treating furnace thereof - Google Patents
Heat treating method of steel material having rolling scale and heat treating furnace thereofInfo
- Publication number
- JPS5576014A JPS5576014A JP14931478A JP14931478A JPS5576014A JP S5576014 A JPS5576014 A JP S5576014A JP 14931478 A JP14931478 A JP 14931478A JP 14931478 A JP14931478 A JP 14931478A JP S5576014 A JPS5576014 A JP S5576014A
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- scale
- heat treating
- furnace
- atmosphere
- 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
Abstract
PURPOSE: To perfectly remove mill scale, etc through pickling of one time alone by positively oxidizing the steel material having rolling scale in an oxidative atmosphere then heat-treating the same in a reducing atmosphere and further re-oxidizing the reduced scale.
CONSTITUTION: Rolled steel material A having scale layers on its surfaces is put in a heating and holding furnace 12, where it is heated to 500W650°C by radiant tubes 13. Weak oxidative atmosphere gas is being supplied in the inside of the furnace, by which the scale layers of the steel material A are subjected to oxidation and slightly grow. Next, the steel material A is loaded into a heat treating furnace body 19 of a reducing atmosphere by way of a loading vestibule 17. The inside of the furnace body 19 is segmented by a drop arch 20 to a heating zone 21 and a slow cooling zone 22. The steel material A is heated to 650W770°C by radiant tubes 23 in the heating zone, after which it is transferred to the slow cooling zone 22, where it is slow cooled to 650W550°C. This is put out into the atmosphere by way of an extraction vestibule 25 and is quenched. At this time, the reduced slace is re-oxidized by the atmospheric air, whereby fine cracks are produced therein. The scale is completely removed by the next pickling 27 of one time.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14931478A JPS5576014A (en) | 1978-12-02 | 1978-12-02 | Heat treating method of steel material having rolling scale and heat treating furnace thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14931478A JPS5576014A (en) | 1978-12-02 | 1978-12-02 | Heat treating method of steel material having rolling scale and heat treating furnace thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5576014A true JPS5576014A (en) | 1980-06-07 |
Family
ID=15472406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14931478A Pending JPS5576014A (en) | 1978-12-02 | 1978-12-02 | Heat treating method of steel material having rolling scale and heat treating furnace thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5576014A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8192566B2 (en) * | 2006-11-14 | 2012-06-05 | Danieli & C. Officine Meccaniche S.P.A. | Annealing and pickling process |
| CN102921749A (en) * | 2012-11-30 | 2013-02-13 | 攀钢集团成都钢钒有限公司 | Method for removing surface scale of chromium-containing seamless steel tube |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2110893A (en) * | 1935-07-16 | 1938-03-15 | American Rolling Mill Co | Process for coating metallic objects with layers of other metals |
-
1978
- 1978-12-02 JP JP14931478A patent/JPS5576014A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2110893A (en) * | 1935-07-16 | 1938-03-15 | American Rolling Mill Co | Process for coating metallic objects with layers of other metals |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8192566B2 (en) * | 2006-11-14 | 2012-06-05 | Danieli & C. Officine Meccaniche S.P.A. | Annealing and pickling process |
| CN102921749A (en) * | 2012-11-30 | 2013-02-13 | 攀钢集团成都钢钒有限公司 | Method for removing surface scale of chromium-containing seamless steel tube |
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