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US3737981A Expired / Lapsed US ⏱️ 0.0 years remaining

Process of manufacturing forged or rolled rod steel from ledeburitic tool steel

Assignee: Gebrueder Boehler and Co AG
•
Filing: 1971-10-12
•
Granted: 1973-06-12
•
Expires: 1991-10-12
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Abstract

Abstract A fusible electrode is provided, which consists of ledeburitic tool steel and is suitable for use in a remelting process. Said electrode is melted. A slab ingot is built up by solidifying the resulting melt in a water-cooled slab ingot mold. Said slab ingot is upset by a succession of forging steps in the direction of the longitudinal axis of said slab ingot to provide a semifinished product. Said semifinished product is subjected to a stretching deformation to an extent of at least two times, based on the cross-section of said semi-finished product, to form a stretched product having the cross-section desired for said rod. From said stretched product, a rod is obtained which has a fairly homogeneous carbide distribution throughout its cross-section and length.

Inventors

  • 👤 E Plockinger
  • 👤 W Holzgruber

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 20:18
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/13; C22; C22B; C22B9/00; C22B9/16; C22B9/18; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49988; Y10T29/49991

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 26 words
A process as set forth in claim 1, in which said slab ingot is upset to form a semi-finished product which is substantially circular in cross-section.
Claim 2
Dependent Claim 26 words
A process as set forth in claim 1, in which said slab ingot is upset to form a semi-finished product which is substantially square in cross-section.
Claim 3
Dependent Claim 21 words
A process as set forth in claim 1, in which said semi-finished product is subjected to said stretching deformation by rolling.
Claim 4
Dependent Claim 21 words
A process as set forth in claim 1, in which said semi-finished product is subjected to said stretching deformation by forging.

References Cited (Backward Citations)

US2462122A Cited
US2871557A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-06-11 1976-12-11 1977-06-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-06-11 1980-12-11 1981-06-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-06-11 1984-12-11 1985-06-12 $7700.00 Window Closed / Lapsed

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