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US4051887A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for producing sheets and strip of zinc-copper-titanium alloy

Assignee: Rheinisches Zinkwalzwerk GmbH and Co KG
•
Filing: 1976-03-08
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Granted: 1977-10-04
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Expires: 1996-03-08
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Abstract

Abstract Deep-drawable sheets and strip are produced on a continuous casting machine with moving flexible belts and continuous finish-rolling without change of direction from a zinc-copper-titanium rolling alloy which is creep-resistant according to DIN 17 770 and foldable according to DIN 1 623. The alloy contains 1.5 to 5.5% copper, 0.05 to 0.25% titanium and, if desired, 0.005 to 0.05% aluminum, balance zinc. The zinc-copper-titanium alloy, wherein an increase in copper content is accompanied by a decrease in titanium content, is continuously cast into a slab having a thickness of 6-24 mm and a width from about 0 to 2000 mm, preferably 500-1500 mm. The slab is caused to solidify simultaneously and uniformly from both sides at a constant volumetric solidification rate and the slab is subjected to hot-rolling at temperatures above 100° C and at least 3, preferably 5 passes, each of which results in a reduction in cross-section not in excess of 80%.

Inventors

  • 👤 Volker Groth
  • 👤 Adolf Stradmann
  • 👤 Erich Pelzel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 08:52
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/06

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 142 words
Process for producing deep-drawable sheets and strip by means of a continuous casting machine with moving flexible belts and continuous finish-rolling without change of direction, which comprises providing a zinc-copper-titanium rolling alloy which is creep-resistant according to DIN 17 770 and foldable according to DIN 1 623, consisting of 1.5 to 5.5% copper, 0.05 to 0.25% titanium and balance zinc, wherein an increase in copper content is accompanied by a decrease in titanium content, continuously casting the zine-copper titanium alloy having a thickness of 6-24 mm and an effective width up to 2000 mm causing the slab to solidify simultaneously and uniformly from both sides at a constant volumetric solidification rate, and subsequently hot-rolling said slab at a temperature above 100° C in at least three, passes, each of which results in an effective reduction in cross-section not in excess of 80%.
Claim 2
Dependent Claim 142 words
Process for producing deep-drawable sheets and strip by means of a continuous casting machine with moving flexible belts and continuous finish-rolling without change of direction, which comprises providing a zinc-copper-titanium rolling alloy which is creep-resistant according to DIN 17 770 and foldable according to DIN 1 623, consisting of 1.5 to 5.5% copper, 0.05 to 0.25% titanium and balance zinc, wherein an increase in copper content is accompanied by a decrease in titanium content, continuously casting the zine-copper titanium alloy having a thickness of 6-24 mm and an effective width up to 2000 mm causing the slab to solidify simultaneously and uniformly from both sides at a constant volumetric solidification rate, and subsequently hot-rolling said slab at a temperature above 100° C in at least three, passes, each of which results in an effective reduction in cross-section not in excess of 80%.
Claim 3
Dependent Claim 19 words
Process of claim 1 wherein the constant volumetric solidification rate amounts to approximately 6 to 200 dm 3 .
Claim 4
Dependent Claim 34 words
Process of claim 1 wherein the alloy slab emerging from the casting machine at a temperature of 120° to 400° C, is hot-rolled in five passes at a temperature of 100° to 350° C,
Claim 5
Dependent Claim 17 words
Process of claim 1 wherein said zinc-copper titanium rolling alloy also contains from 0.005 to 0.05% aluminum.
Claim 6
Dependent Claim 13 words
Process of claim 1 wherein said slab has a width from 500-1500 mm.

References Cited (Backward Citations)

US3426836A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-10-03 1981-04-04 1981-10-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-10-03 1985-04-04 1985-10-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-10-03 1989-04-04 1989-10-04 $7700.00 Window Closed / Lapsed

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