JPS57114638A - Bar steel for reinforcing rod with superior toughness at low temperature and seawater resistance, and its manufacture - Google Patents
Bar steel for reinforcing rod with superior toughness at low temperature and seawater resistance, and its manufactureInfo
- Publication number
- JPS57114638A JPS57114638A JP18701780A JP18701780A JPS57114638A JP S57114638 A JPS57114638 A JP S57114638A JP 18701780 A JP18701780 A JP 18701780A JP 18701780 A JP18701780 A JP 18701780A JP S57114638 A JPS57114638 A JP S57114638A
- Authority
- JP
- Japan
- Prior art keywords
- temp
- seawater resistance
- toughness
- bar steel
- rolling
- 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)
Abstract
PURPOSE: To obtain a bar steel for a reinforcing rod with remarkably superior toughness at low temp. and seawater resistance by reducing the Si, P and S contents of a low Ni bar steel, controlling the temp. of finish rolling, and carrying out surfce hardening immediately after rolling.
CONSTITUTION: A steel consisting of ≤0.17% C, ≤0.20% Si, ≤0.70% Mn, ≤0.015% P, ≤0.005% S, 2W4% Ni and the balance Fe with inevitable impurities is hot rolled. The temp. of the finish rolling is controlled to about 750W 900°C, and cooling is carried out at ≥ about 20°C/sec cooling rate immediately after the rolling to provide a tempered martensite or bainite structure to the surface layer having ≥3mm thickness and a ferrite and pearlite structure to the interior. The resulting steel has ≥40kg/mm2 yield strength, ≥4kg-m Charpy impact value at -150°C and superior seawater resistance. By controlling the temp. of the finish rolling, the grain size is made smaller, and even the unhardened part undergoes no reduction in the toughness at low temp. owing to the samller grain size together with the effect of Ni. The lower Si, P and S contents result in improved toughness and remarkably enhanced seawater resistance.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18701780A JPS57114638A (en) | 1980-12-30 | 1980-12-30 | Bar steel for reinforcing rod with superior toughness at low temperature and seawater resistance, and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18701780A JPS57114638A (en) | 1980-12-30 | 1980-12-30 | Bar steel for reinforcing rod with superior toughness at low temperature and seawater resistance, and its manufacture |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8228285A Division JPS6112849A (en) | 1985-04-19 | 1985-04-19 | Reinforced steel bar with excellent low temperature toughness and seawater resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57114638A true JPS57114638A (en) | 1982-07-16 |
| JPS617444B2 JPS617444B2 (en) | 1986-03-06 |
Family
ID=16198734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18701780A Granted JPS57114638A (en) | 1980-12-30 | 1980-12-30 | Bar steel for reinforcing rod with superior toughness at low temperature and seawater resistance, and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57114638A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4786338A (en) * | 1985-10-31 | 1988-11-22 | Norio Anzawa | Method for cooling rolled steels |
| JPH02240236A (en) * | 1989-03-15 | 1990-09-25 | Nkk Corp | Salt damage-resistant pc steel bar |
| US5755895A (en) * | 1995-02-03 | 1998-05-26 | Nippon Steel Corporation | High strength line pipe steel having low yield ratio and excellent in low temperature toughness |
-
1980
- 1980-12-30 JP JP18701780A patent/JPS57114638A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4786338A (en) * | 1985-10-31 | 1988-11-22 | Norio Anzawa | Method for cooling rolled steels |
| JPH02240236A (en) * | 1989-03-15 | 1990-09-25 | Nkk Corp | Salt damage-resistant pc steel bar |
| US5755895A (en) * | 1995-02-03 | 1998-05-26 | Nippon Steel Corporation | High strength line pipe steel having low yield ratio and excellent in low temperature toughness |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS617444B2 (en) | 1986-03-06 |
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