JPS5684419A - Production of low yield-ratio high-tension hot-rolled steel-plate - Google Patents
Production of low yield-ratio high-tension hot-rolled steel-plateInfo
- Publication number
- JPS5684419A JPS5684419A JP16130779A JP16130779A JPS5684419A JP S5684419 A JPS5684419 A JP S5684419A JP 16130779 A JP16130779 A JP 16130779A JP 16130779 A JP16130779 A JP 16130779A JP S5684419 A JPS5684419 A JP S5684419A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- plate
- produce
- low yield
- ratio high
- 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
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
PURPOSE: To produce a low yield-ratio high-tension steel plate without using a valuable additive element by applying a continuous annealing treatment to a hot rolled plate of low-carbon steel containing a minor amount of Al or further Ca under a specific condition.
CONSTITUTION: A steel ingot containing: C; 0.03W0.10wt%, Mn; 1.20W2.0%, Si<0.30%, Al; 0.010W0.10%, or further Ca; 0.0010W0.0050% is hot rolled at a temperature over Ar3 transformation point to produce a steel plate. The steel plate is wound into coil at 500W600°C. The steel is then soaked at the temperature range of Ac3WAc3+50°C to produce uniform austenite grain structure. Immediately thereafter, the steel is rapidly cooled at a rate of 40W70°C/sec to a temperature just below Ar1 modification point, then gradually cooled by air to about 550°C, causing the remaining austenite to be transformed into martensite structure.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16130779A JPS5684419A (en) | 1979-12-11 | 1979-12-11 | Production of low yield-ratio high-tension hot-rolled steel-plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16130779A JPS5684419A (en) | 1979-12-11 | 1979-12-11 | Production of low yield-ratio high-tension hot-rolled steel-plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5684419A true JPS5684419A (en) | 1981-07-09 |
Family
ID=15732610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16130779A Pending JPS5684419A (en) | 1979-12-11 | 1979-12-11 | Production of low yield-ratio high-tension hot-rolled steel-plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5684419A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60149730A (en) * | 1984-01-17 | 1985-08-07 | Nippon Kokan Kk <Nkk> | Production of medium strength hot rolled steel sheet having excellent workability |
| JPH0474824A (en) * | 1990-07-18 | 1992-03-10 | Sumitomo Metal Ind Ltd | Production of hot rolled steel plate excellent in baking hardenability and workability |
-
1979
- 1979-12-11 JP JP16130779A patent/JPS5684419A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60149730A (en) * | 1984-01-17 | 1985-08-07 | Nippon Kokan Kk <Nkk> | Production of medium strength hot rolled steel sheet having excellent workability |
| JPH0132293B2 (en) * | 1984-01-17 | 1989-06-30 | Nippon Kokan Kk | |
| JPH0474824A (en) * | 1990-07-18 | 1992-03-10 | Sumitomo Metal Ind Ltd | Production of hot rolled steel plate excellent in baking hardenability and workability |
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