JPS57145965A - High strength hot rolled steel plate and its manufacture - Google Patents
High strength hot rolled steel plate and its manufactureInfo
- Publication number
- JPS57145965A JPS57145965A JP3178981A JP3178981A JPS57145965A JP S57145965 A JPS57145965 A JP S57145965A JP 3178981 A JP3178981 A JP 3178981A JP 3178981 A JP3178981 A JP 3178981A JP S57145965 A JPS57145965 A JP S57145965A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- hot rolled
- bainite
- strength
- excess
- 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
- 229910000831 Steel Inorganic materials 0.000 title abstract 6
- 239000010959 steel Substances 0.000 title abstract 6
- 238000004519 manufacturing process Methods 0.000 title 1
- 229910001563 bainite Inorganic materials 0.000 abstract 4
- 229910001568 polygonal ferrite Inorganic materials 0.000 abstract 3
- 238000001816 cooling Methods 0.000 abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000002131 composite material Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
PURPOSE: To obtain a high strength hot rolled steel plate with superior formability, eapecially stretch flanging property, resistance weldability and fatigue characteristics by spedifying the C, Si and Mn contents of a hot rolled steel plate and the areal percentage of bainite in the structure composed of polygonal ferrite and bainite.
CONSTITUTION: This steel plate contains 0.01W0.12% c, 0.1W1.6%Si and 0.7W 2.5%Mn and has a composite structure composed of polygonal ferrite and 5W 60% by area of bainite. steel having said composition is hot rolled, cooled to 700W500°C at 5W35°C/sec average cooling rate, further cooled at 25W80°C/sec average cooling rate, and coiled at 575W250°C. Thus, this steel can be manufactured. C is added to enhance the strength and hardenability, yet excess C increases the didderence in hardness between the flash butt weld line and its vicinity. Mn is added to compensate for a reduction in strength due to the lower C content and to obtain bainite, yet excess Mn makes the refining difficult and deteriorates the ductility. Si is added to facilitate the formation of polygonal ferrite and to enhance the strength and ductility, yet excess Si causes embrittlement to the weld zone.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3178981A JPS57145965A (en) | 1981-03-04 | 1981-03-04 | High strength hot rolled steel plate and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3178981A JPS57145965A (en) | 1981-03-04 | 1981-03-04 | High strength hot rolled steel plate and its manufacture |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11953585A Division JPS6196057A (en) | 1985-06-01 | 1985-06-01 | Hot-rolled steel plate having maximum strength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57145965A true JPS57145965A (en) | 1982-09-09 |
| JPH0146583B2 JPH0146583B2 (en) | 1989-10-09 |
Family
ID=12340824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3178981A Granted JPS57145965A (en) | 1981-03-04 | 1981-03-04 | High strength hot rolled steel plate and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57145965A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60184628A (en) * | 1984-02-29 | 1985-09-20 | Nippon Steel Corp | Method for manufacturing high-strength hot-rolled steel sheets with excellent workability |
| JPS6173829A (en) * | 1984-09-17 | 1986-04-16 | Nippon Steel Corp | Method for manufacturing high-strength steel with ultra-fine structure |
| KR100954201B1 (en) * | 2007-12-24 | 2010-04-21 | 주식회사 포스코 | Hot rolled steel sheet with excellent strength and ductility and its manufacturing method |
| JP2010189738A (en) * | 2009-02-20 | 2010-09-02 | Jfe Steel Corp | High strength hot rolled steel sheet having excellent workability, and method for producing the same |
| CN104962807A (en) * | 2015-07-10 | 2015-10-07 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength hot rolled steel as well as manufacturing method and application thereof |
-
1981
- 1981-03-04 JP JP3178981A patent/JPS57145965A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60184628A (en) * | 1984-02-29 | 1985-09-20 | Nippon Steel Corp | Method for manufacturing high-strength hot-rolled steel sheets with excellent workability |
| JPS6173829A (en) * | 1984-09-17 | 1986-04-16 | Nippon Steel Corp | Method for manufacturing high-strength steel with ultra-fine structure |
| KR100954201B1 (en) * | 2007-12-24 | 2010-04-21 | 주식회사 포스코 | Hot rolled steel sheet with excellent strength and ductility and its manufacturing method |
| JP2010189738A (en) * | 2009-02-20 | 2010-09-02 | Jfe Steel Corp | High strength hot rolled steel sheet having excellent workability, and method for producing the same |
| CN104962807A (en) * | 2015-07-10 | 2015-10-07 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength hot rolled steel as well as manufacturing method and application thereof |
| CN104962807B (en) * | 2015-07-10 | 2017-06-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high strength rolled steel and its preparation method and application |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0146583B2 (en) | 1989-10-09 |
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