JPS5655524A - Production of cold-rolled steel plate for press forming - Google Patents
Production of cold-rolled steel plate for press formingInfo
- Publication number
- JPS5655524A JPS5655524A JP12918079A JP12918079A JPS5655524A JP S5655524 A JPS5655524 A JP S5655524A JP 12918079 A JP12918079 A JP 12918079A JP 12918079 A JP12918079 A JP 12918079A JP S5655524 A JPS5655524 A JP S5655524A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- recrystallization
- cold
- rolled steel
- steel plate
- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
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 Sheet Steel (AREA)
Abstract
PURPOSE:To produce a cold-rolled steel plate of superior press formability with good thermal efficiency by a continuous annealing method by heating and holding a cold-rolled steel at above its recrystallization temperature, then cooling the same under specific conditions and applying overaging treatment. CONSTITUTION:A cold-rolled steel plate is quickly heated from room temperature to up to a temperature T2 above its recrystallization temperature, whereby it is subjected to recrystallization annealing for a predetermined time. In this case, if it is quickly heated at a rate h1 up to the temperature T1 above the recrystallization temperature and below the A1 transformation temperature and if in succession to this it is slowly heated at a rate h2 down to the annealing temperature T2 above the A1 transformation temperature and below about 850 deg.C, better recrystallization structure may be obtained. Following to this, it is quickly cooled down to 650 deg.C-A1 transformation point T3 at 5-40 deg.C/sec. cooling rates C1 after the recrystallization annealing, thence it is quickly cooled down to overaging initiating temperature T4 of 300-500 deg.C at 50-500 deg.C/sec. cooling rates C2. At this time, the rates C1, C2 are so set as to become the product of cooling rates C1XC2=600-5,000( deg.C/sec)<2> and C2/C1>=3. After quick cooling to a temperature T4, overaging treatment is applied in succession.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12918079A JPS5655524A (en) | 1979-10-05 | 1979-10-05 | Production of cold-rolled steel plate for press forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12918079A JPS5655524A (en) | 1979-10-05 | 1979-10-05 | Production of cold-rolled steel plate for press forming |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5655524A true JPS5655524A (en) | 1981-05-16 |
Family
ID=15003110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12918079A Pending JPS5655524A (en) | 1979-10-05 | 1979-10-05 | Production of cold-rolled steel plate for press forming |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5655524A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5852440A (en) * | 1981-09-21 | 1983-03-28 | Nippon Steel Corp | Production of delayed aging high strength cold rolled steel plate having high deep drawability and excellent press workability by continuous annealing |
| JPS59190330A (en) * | 1983-04-11 | 1984-10-29 | Kawasaki Steel Corp | Method for improving drawability of steel sheet |
-
1979
- 1979-10-05 JP JP12918079A patent/JPS5655524A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5852440A (en) * | 1981-09-21 | 1983-03-28 | Nippon Steel Corp | Production of delayed aging high strength cold rolled steel plate having high deep drawability and excellent press workability by continuous annealing |
| JPS6111295B2 (en) * | 1981-09-21 | 1986-04-02 | Nippon Steel Corp | |
| JPS59190330A (en) * | 1983-04-11 | 1984-10-29 | Kawasaki Steel Corp | Method for improving drawability of steel sheet |
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