JPS644423A - Manufacture of bar steel with fine-grain structure - Google Patents
Manufacture of bar steel with fine-grain structureInfo
- Publication number
- JPS644423A JPS644423A JP15742587A JP15742587A JPS644423A JP S644423 A JPS644423 A JP S644423A JP 15742587 A JP15742587 A JP 15742587A JP 15742587 A JP15742587 A JP 15742587A JP S644423 A JPS644423 A JP S644423A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- fine
- carbon
- steel
- ferrite
- 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
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
PURPOSE:To manufacture a non-heattreated bar steel with high toughness, by specifying steel slab-heating temp. in hot rolling and also specifying rolling- finishing temp., rate of strain, and the total quantity of working in finish rolling, respectively, in a medium-carbon steel containing specific amounts of carbon. CONSTITUTION:At the time of applying hot rolling to a medium-carbon steel containing 0.2-0.6wt.% carbon, a steel slab is heated to 800-900 deg.C to undergo roughing and intermediate rolling. Subsequently, in a finishing mill train, finish rolling is applied under the conditions of 800-900 deg.C rolling-finishing temp., 1-50sec<-1> rate of strain, and >=50% cumulative quantity of working to form a fine austenitic structure with austenite grain size No.11 or above and free from ferrite. Since this structure hardly grows in the coruce of cooling from hot rolling to ferrite transformation, a fine-grain structure composed of fine and isometric ferrite-pearlite grains is obtained. By this method, the as-rolled bar steel combining superior toughness with high strength can be manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15742587A JPS644423A (en) | 1987-06-24 | 1987-06-24 | Manufacture of bar steel with fine-grain structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15742587A JPS644423A (en) | 1987-06-24 | 1987-06-24 | Manufacture of bar steel with fine-grain structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS644423A true JPS644423A (en) | 1989-01-09 |
Family
ID=15649354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15742587A Pending JPS644423A (en) | 1987-06-24 | 1987-06-24 | Manufacture of bar steel with fine-grain structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS644423A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03240921A (en) * | 1990-02-15 | 1991-10-28 | Sumitomo Metal Ind Ltd | Production of seamless steel tube having superfine structure |
| JPH03267316A (en) * | 1990-03-19 | 1991-11-28 | Sumitomo Metal Ind Ltd | Production of seamless steel tube having superfine structure |
| JPH04143219A (en) * | 1990-10-03 | 1992-05-18 | Sumitomo Metal Ind Ltd | Production of bar steel having superfine structure |
-
1987
- 1987-06-24 JP JP15742587A patent/JPS644423A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03240921A (en) * | 1990-02-15 | 1991-10-28 | Sumitomo Metal Ind Ltd | Production of seamless steel tube having superfine structure |
| JPH03267316A (en) * | 1990-03-19 | 1991-11-28 | Sumitomo Metal Ind Ltd | Production of seamless steel tube having superfine structure |
| JPH04143219A (en) * | 1990-10-03 | 1992-05-18 | Sumitomo Metal Ind Ltd | Production of bar steel having superfine structure |
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