JPS5757839A - Continuous production installation for high tensile steel strip having composite structure - Google Patents
Continuous production installation for high tensile steel strip having composite structureInfo
- Publication number
- JPS5757839A JPS5757839A JP13060780A JP13060780A JPS5757839A JP S5757839 A JPS5757839 A JP S5757839A JP 13060780 A JP13060780 A JP 13060780A JP 13060780 A JP13060780 A JP 13060780A JP S5757839 A JPS5757839 A JP S5757839A
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- zone
- cooling zone
- cooling
- diameters
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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 Strip Materials And Filament Materials (AREA)
Abstract
PURPOSE:To produce a high tensile low yield point steel strip having composite structure continuously by setting the diameters of the hearth rolls in the cooling zone of a heat treatment device for steel strips at specific sizes and controlling the cooling rate of the steel strip adequately. CONSTITUTION:A steel strip is passed continuously through the inside of a heating zone 5, a soaking zone 6, a primary cooling zone 7, and a secondary cooling zone, whereby it is heat-treated. In the cooling zone 5, it is heated for <=3min in a temp. region of 723-900 deg.C where alpha phase and gamma phase coexist, or for <=10min in gamma phase region of 900-1,000 deg.C. Next, it is held for 300sec-500min at 723-900 deg.C or 1-10min at 900-1,000 deg.C in the soaking zone 6. In the primary cooling zone 7, the steel strip is colled at 1-300 deg.C/sec cooling rates down to 200-300 deg.C, and in the secondary cooling zone 8, it is cooled down to below 200 deg.C. Here, the diameters of upper, lower hearth rolls 17, 18, 17', 18' of the cooling zones are set at the sizes expressed by the equation (I), and the diameters of the plied rolls of ancillary equipment are regulated at the sizes expressed by the equation (II).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13060780A JPS5757839A (en) | 1980-09-22 | 1980-09-22 | Continuous production installation for high tensile steel strip having composite structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13060780A JPS5757839A (en) | 1980-09-22 | 1980-09-22 | Continuous production installation for high tensile steel strip having composite structure |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5757839A true JPS5757839A (en) | 1982-04-07 |
Family
ID=15038251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13060780A Pending JPS5757839A (en) | 1980-09-22 | 1980-09-22 | Continuous production installation for high tensile steel strip having composite structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5757839A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4963046A (en) * | 1987-05-13 | 1990-10-16 | Kao Corporation | Toothbrush |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54120222A (en) * | 1978-03-10 | 1979-09-18 | Nippon Steel Corp | Continuously manufacturing equipment for high tensile steel strip of composite structure |
-
1980
- 1980-09-22 JP JP13060780A patent/JPS5757839A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54120222A (en) * | 1978-03-10 | 1979-09-18 | Nippon Steel Corp | Continuously manufacturing equipment for high tensile steel strip of composite structure |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4963046A (en) * | 1987-05-13 | 1990-10-16 | Kao Corporation | Toothbrush |
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