JPS55106649A - Steel bar having porous or void parts around center - Google Patents
Steel bar having porous or void parts around centerInfo
- Publication number
- JPS55106649A JPS55106649A JP1326479A JP1326479A JPS55106649A JP S55106649 A JPS55106649 A JP S55106649A JP 1326479 A JP1326479 A JP 1326479A JP 1326479 A JP1326479 A JP 1326479A JP S55106649 A JPS55106649 A JP S55106649A
- Authority
- JP
- Japan
- Prior art keywords
- steel bar
- center
- porous
- rolling
- void parts
- 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
Abstract
PURPOSE: To make working easy and improve material yield by holding porous or void parts around the center of the steel bar.
CONSTITUTION: Porous or void parts of 2% or more and 50% or less in cross sectional area being continuous in the axial direction are provided around the center of the steel bar. The steel bar includes steel bars wound in coil form, and those normally called bar-in-coil, besides straight steel bars. The steel bars are produced by rolling the hollow slabs which comprise forming "rolling crack" in the central part of the slab by, e.g., a Mannesmann system, or forming "cavities" deliberately in the central part in continuous casting or which are made by centrifugal, Mannesmann, Earhart, or press mill methods. The holes of the slab are gradually pressed along with the progression of rolling and the periphery of the center of the steel bar becomes porous including oxides. Hole may be readily opened in the center of such steel bar by either cutting or blanking.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1326479A JPS55106649A (en) | 1979-02-09 | 1979-02-09 | Steel bar having porous or void parts around center |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1326479A JPS55106649A (en) | 1979-02-09 | 1979-02-09 | Steel bar having porous or void parts around center |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55106649A true JPS55106649A (en) | 1980-08-15 |
JPS616735B2 JPS616735B2 (en) | 1986-02-28 |
Family
ID=11828347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1326479A Granted JPS55106649A (en) | 1979-02-09 | 1979-02-09 | Steel bar having porous or void parts around center |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55106649A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01197616A (en) * | 1988-02-03 | 1989-08-09 | Higashi Nippon Riyokaku Tetsudo Kk | Measuring method for riding rate |
-
1979
- 1979-02-09 JP JP1326479A patent/JPS55106649A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS616735B2 (en) | 1986-02-28 |
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