US4462844A
Expired / Lapsed
US
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Process for manufacturing hot extruded alloy products
Assignee: Nippon Steel Corp
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Filing: 1982-07-26
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Granted: 1984-07-31
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Expires: 2002-07-26
Abstract
Abstract A process for manufacturing a hot extruded product from a continuously cast stainless steel or super alloy billet comprises cold working the surface of the billet, heating the billet to extrude it and at the same time to provide a fine recrystallized structure in its surface layer, and hot extruding the billet.
Inventors
- 👤 Tsunetoshi Takahashi
- 👤 Masao Suzuki
- 👤 Tadayuki Okinaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:57
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/002; C; C21; C21D; C21D7/00; C21D7/13; C21D8/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
A process for producing a hot extruded alloy product, comprising: cold working the surface of a continuously cast stainless steel or super alloy billet; heating the cold worked billet to provide a fine structure in its surface layer; and hot extruding the resultant billet.
Claim 2
Dependent Claim
44 words
A process for producing a hot extruded alloy product, comprising: cold working the surface of a continuously cast stainless steel or super alloy billet; heating the cold worked billet to provide a fine structure in its surface layer; and hot extruding the resultant billet.
Claim 3
Dependent Claim
23 words
A process as set forth in claim 1, wherein said surface to be cold worked includes a cut end surface of said billet.
Claim 4
Dependent Claim
29 words
A process as set forth in claim 1 or 2, wherein said surface layer in which said fine structure is provided has a thickness of at least 3 mm.
Claim 5
Dependent Claim
18 words
A process as set forth in claim 1 or 2, wherein said cold working is achieved by blasting.
Claim 6
Dependent Claim
20 words
A process as set forth in claim 4, wherein said blasting also serves to remove scale from said billet surface.
Claim 7
Dependent Claim
32 words
A process as set forth in claim 1 or 2, wherein said cold working is effected by rolling at a reduction rate of 1% or less after said surface has been peeled.
Claim 8
Dependent Claim
38 words
A process as set forth in claim 1 or 2, wherein said cold working is effected by rolling by a holding roll in a centerless peeling machine simultaneously with peeling, provided said billet is circular in cross section.
Claim 9
Dependent Claim
21 words
A process as set forth in claim 1 or 2, wherein said extruding is effected by employing a reversely tapered die.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |