JPS5528336A - Manufacture of hot rolled precipitation hardening type steel sheet of low yield ratio of 0.8 or less - Google Patents
Manufacture of hot rolled precipitation hardening type steel sheet of low yield ratio of 0.8 or lessInfo
- Publication number
- JPS5528336A JPS5528336A JP10068678A JP10068678A JPS5528336A JP S5528336 A JPS5528336 A JP S5528336A JP 10068678 A JP10068678 A JP 10068678A JP 10068678 A JP10068678 A JP 10068678A JP S5528336 A JPS5528336 A JP S5528336A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- strip
- hot
- slab
- manufacture
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/02—Hardening by precipitation
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)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
PURPOSE:To manufacture the high tension steel sheet of the yield ratio of 0.8 or less with excellent ductility, in the hot strip mill, by rolling under a specified hot rolling condition the steel material containing the precipitation hardening element like as Nb, V, etc. CONSTITUTION:The steel material provided for the next process is specified to contain 0.15- 0.25% C, Si-0.7%, Mn-1.5%, 0.005-0.080% Al and one of 0.005-0.03% Nb or 0.01- 0.04% V, or otherwise, in case of containing both of Nb and V, total amount of Nb and V is specified to 0.005-0.05%. Or additionally, one or more than two kinds of Cr, Ni, Mo, Cu, respectively under 0.5%, REM and Zr respectively under 0.10% and Ca <=0.02%, are contained. The slab of this steel material is heated to above 1200 deg.C, in order to thoroughly transform the carbide and nitride of Nb and V into the solid solution; after that, the slab at about 1000 deg.C is rough rolled by the hot strip mill. Next, the slab is finish rolled at 830-900 deg.C, and is cooled at the cooling rate 5-20 deg.C/sec, and then, is wound into a coil at 550-700 deg.C. Or otherwise, the coiled strip is uncoiled for giving the bending deformation at the maximum surface strain 0.6-2.0% to the strip for producing the finished strip. Hereby, the hot rolled steel sheet with the yield strength above 30kg/mm<2> can be manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10068678A JPS5528336A (en) | 1978-08-18 | 1978-08-18 | Manufacture of hot rolled precipitation hardening type steel sheet of low yield ratio of 0.8 or less |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10068678A JPS5528336A (en) | 1978-08-18 | 1978-08-18 | Manufacture of hot rolled precipitation hardening type steel sheet of low yield ratio of 0.8 or less |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5528336A true JPS5528336A (en) | 1980-02-28 |
| JPS6137332B2 JPS6137332B2 (en) | 1986-08-23 |
Family
ID=14280610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10068678A Granted JPS5528336A (en) | 1978-08-18 | 1978-08-18 | Manufacture of hot rolled precipitation hardening type steel sheet of low yield ratio of 0.8 or less |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5528336A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56139626A (en) * | 1980-03-31 | 1981-10-31 | Kobe Steel Ltd | Production of hot-rolled steel plate of superior strength-ductility balance |
| US4990196A (en) * | 1988-06-13 | 1991-02-05 | Nippon Steel Corporation | Process for manufacturing building construction steel having excellent fire resistance and low yield ratio |
| JP2006169173A (en) * | 2004-12-16 | 2006-06-29 | Toyobo Co Ltd | Method for using sheet-shaped packing material |
-
1978
- 1978-08-18 JP JP10068678A patent/JPS5528336A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56139626A (en) * | 1980-03-31 | 1981-10-31 | Kobe Steel Ltd | Production of hot-rolled steel plate of superior strength-ductility balance |
| JPS6115929B2 (en) * | 1980-03-31 | 1986-04-26 | Kobe Steel Ltd | |
| US4990196A (en) * | 1988-06-13 | 1991-02-05 | Nippon Steel Corporation | Process for manufacturing building construction steel having excellent fire resistance and low yield ratio |
| JP2006169173A (en) * | 2004-12-16 | 2006-06-29 | Toyobo Co Ltd | Method for using sheet-shaped packing material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6137332B2 (en) | 1986-08-23 |
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