JPS5658924A - Production of high tensile steel plate - Google Patents
Production of high tensile steel plateInfo
- Publication number
- JPS5658924A JPS5658924A JP13324279A JP13324279A JPS5658924A JP S5658924 A JPS5658924 A JP S5658924A JP 13324279 A JP13324279 A JP 13324279A JP 13324279 A JP13324279 A JP 13324279A JP S5658924 A JPS5658924 A JP S5658924A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- slab
- heated
- hot
- cracking
- 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
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
PURPOSE: To prevent delayed cracking from occuring at the producing of a high tensile steel, by slow cooling a slab then warm-cutting the same to prevent cracking, directly hardening the hot-rolled steel plate right after rolling and again heating and slow cooling the same and further annealing this.
CONSTITUTION: After a slab made by blooming a steel ingot is once cooled down to around 200°C, it is reheated to 300W600°C and is slow cooled at ≤0.001°C/sec. cooling rate. At the point of ≥200°C in the temperature of this slow cooling process, the slab is warm cut by gas cutting or the like to be parted to plural slabs of predetermined length, whereby the cracking at ≤200°C temperatures is prevented. In succession, it is immediately heated to 1,150W1,250°C of hot rolling temperatures, and is hot-rolled to a steel plate which is then directly hardened by water cooling from ≥A1 transformation point. The hardening end temperature is kept at 150W 200°C. In succession, it is heated to 300W400°C in a heating furnace and is cooled in the furnace. At ≤200°C, it is let to cool, and finally, it is heated to 450W650°C and is tempered.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13324279A JPS5814850B2 (en) | 1979-10-15 | 1979-10-15 | Manufacturing method of high-strength steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13324279A JPS5814850B2 (en) | 1979-10-15 | 1979-10-15 | Manufacturing method of high-strength steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5658924A true JPS5658924A (en) | 1981-05-22 |
| JPS5814850B2 JPS5814850B2 (en) | 1983-03-22 |
Family
ID=15100024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13324279A Expired JPS5814850B2 (en) | 1979-10-15 | 1979-10-15 | Manufacturing method of high-strength steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5814850B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6443848U (en) * | 1987-09-09 | 1989-03-16 |
-
1979
- 1979-10-15 JP JP13324279A patent/JPS5814850B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5814850B2 (en) | 1983-03-22 |
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