JPS5582728A - Heat-treating method for steel material having mill scale and heat-treating furnace thereof - Google Patents
Heat-treating method for steel material having mill scale and heat-treating furnace thereofInfo
- Publication number
- JPS5582728A JPS5582728A JP14688678A JP14688678A JPS5582728A JP S5582728 A JPS5582728 A JP S5582728A JP 14688678 A JP14688678 A JP 14688678A JP 14688678 A JP14688678 A JP 14688678A JP S5582728 A JPS5582728 A JP S5582728A
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- mill scale
- heat
- furnace
- pickling
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
PURPOSE:To remove mill scale etc. completely by a single pickling, by heating steel material having mill scale adhered thereon directly in a reducing atmosphere, then by maintaining the steel material at a temp. in an oxidizing atmosphere, finally by pickling the steel material. CONSTITUTION:Steel material A, which has been hot rolled and has roll scale adhered to the surface thereof, is charged through a charge vestibule 12 to a heating furnace 15. The furnace 15 is divided into a heating zone 17 and a slow cooling zone 18 by a drop arch 16. To both zones 17, 18 is charged a reducing gas. The steel material A is heated with radiation heat from radiant tubes 19, and the mill scale adhered on the surface of the steel material is reduced. The steel material is cooled in the slow cooling zone 18, then delivered through an extraction vestibule 21 to a heat-maintaining furnace 25, where it is kept in a weakly oxidizing atmosphere at a temp. 650-500 deg.C for 0.5-1.5hrs., so that mill scale is oxidized once again. The steel material A is taken out to the air, hereby fine cracks are formed in the mill scale. The steel material is finally removed of mill scale completely in a pickling tank 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14688678A JPS5582728A (en) | 1978-11-27 | 1978-11-27 | Heat-treating method for steel material having mill scale and heat-treating furnace thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14688678A JPS5582728A (en) | 1978-11-27 | 1978-11-27 | Heat-treating method for steel material having mill scale and heat-treating furnace thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5582728A true JPS5582728A (en) | 1980-06-21 |
| JPS5728725B2 JPS5728725B2 (en) | 1982-06-18 |
Family
ID=15417791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14688678A Granted JPS5582728A (en) | 1978-11-27 | 1978-11-27 | Heat-treating method for steel material having mill scale and heat-treating furnace thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5582728A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5019482A (en) * | 1973-06-20 | 1975-02-28 | ||
| JPS5260209A (en) * | 1975-11-13 | 1977-05-18 | Daido Steel Co Ltd | Method of heatttreating processed steel to minimize scale formation and furnace for such heat treatment |
-
1978
- 1978-11-27 JP JP14688678A patent/JPS5582728A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5019482A (en) * | 1973-06-20 | 1975-02-28 | ||
| JPS5260209A (en) * | 1975-11-13 | 1977-05-18 | Daido Steel Co Ltd | Method of heatttreating processed steel to minimize scale formation and furnace for such heat treatment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5728725B2 (en) | 1982-06-18 |
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