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US3844774A Expired / Lapsed US ⏱️ 0.0 years remaining

Corrosion-resistant alloys

Assignee: Carondelet Foundry Co
•
Filing: 1973-09-24
•
Granted: 1974-10-29
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Expires: 1993-09-24
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Abstract

Abstract A workable, machinable alloy having good corrosion resistance to sulfuric acid solutions over a wide range of acid concentrations. The alloy consists essentially of between about 35.2 and about 46.2 percent by weight nickel, between about 14.9 and about 25.3 percent by weight chromium, between about 6.7 and about 14.5 percent by weight molybdenum, between about 4.3 and about 8.1 percent by weight copper, between about 14.06 and about 30.62 percent by weight iron, up to about 1.50 by weight manganese, up to about 0.11 percent by weight carbon, up to about 1.00 percent by weight silicon, up to about 0.010 percent by weight boron, up to about 1.00 percent by weight niobium, up to about 2.00 percent by weight tantalum, and up to about 1.00 percent by weight titanium. It is also essential that the sum of the molybdenum content and copper content be at least about 11.7 percent by weight. The sum of the niobium plus one-half the tantalum content should not exceed about 1.00 percent by weight.

Inventors

  • 👤 J Culling

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 16:44
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055; C22C19/056; C22F; C22F1/00; C22F1/10

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 151 words
A CORRESION-RESISTANT ALLOY CONSISTING ESSENTIALLY OF BETWEEN ABOUT 35.2 AND ABOUT 46.2 PERCENT BY WEIGHT NICKEL, BETWEEN ABOUT 14.9 AND ABOUT 25.3 PERCENT BY WEIGHT CHROMIUM, BETWEEN 6.7 AND ABOUT 14.5 PERCENT BY WEIGHT MOLYBDENUM, ETWEEN ABOUT 4.3 AND ABOUT 8.1 PERCENT BY WEIGHT COPPER, BETWEEN ABOUT 14.06 AND ABOUT 30.62 PERCENT BY WEIGHT IRON, UP TO ABOUT 0.11 PERCENT BY WEIGHT CARBOB, UP TO ABOUT 1.00 PERCENT BY WEIGHT SILICON, UP TO ABOUT 1.50 PERCENT BY WEIGHT MANGANESE, UP TO ABOUT 0.010 PERCENT BY WEIGHT BORON, UP !O ABOUT 1.00 PERCENT BY WEIGHT NIOBIUM, UP TO ABOUT 2.00 PERCENT BY WEIGHT TANTALYM, AND UP TO ABOUT 1.00 PERCENT WEIGHT TITANIUM, THE SUM OF THE MOLYBDENUM, CONTENT AND THE COPPER CONTENT BEING AT LEAST ABOUT 11.7 PERCENT BY WEIGHT AND THE SUM OF THE NIOBIUM CONTENT AND ONE-HALF OF THE TANTALUM CONTENT BEING NO GREATER THAN ABOUT 1.00 PERCENT BY WEIGHT.
Claim 2
Dependent Claim 151 words
A CORRESION-RESISTANT ALLOY CONSISTING ESSENTIALLY OF BETWEEN ABOUT 35.2 AND ABOUT 46.2 PERCENT BY WEIGHT NICKEL, BETWEEN ABOUT 14.9 AND ABOUT 25.3 PERCENT BY WEIGHT CHROMIUM, BETWEEN 6.7 AND ABOUT 14.5 PERCENT BY WEIGHT MOLYBDENUM, ETWEEN ABOUT 4.3 AND ABOUT 8.1 PERCENT BY WEIGHT COPPER, BETWEEN ABOUT 14.06 AND ABOUT 30.62 PERCENT BY WEIGHT IRON, UP TO ABOUT 0.11 PERCENT BY WEIGHT CARBOB, UP TO ABOUT 1.00 PERCENT BY WEIGHT SILICON, UP TO ABOUT 1.50 PERCENT BY WEIGHT MANGANESE, UP TO ABOUT 0.010 PERCENT BY WEIGHT BORON, UP !O ABOUT 1.00 PERCENT BY WEIGHT NIOBIUM, UP TO ABOUT 2.00 PERCENT BY WEIGHT TANTALYM, AND UP TO ABOUT 1.00 PERCENT WEIGHT TITANIUM, THE SUM OF THE MOLYBDENUM, CONTENT AND THE COPPER CONTENT BEING AT LEAST ABOUT 11.7 PERCENT BY WEIGHT AND THE SUM OF THE NIOBIUM CONTENT AND ONE-HALF OF THE TANTALUM CONTENT BEING NO GREATER THAN ABOUT 1.00 PERCENT BY WEIGHT.
Claim 3
Dependent Claim 28 words
An alloy as set forth in claim 1 wherein the sum of the niobium content and the tantalum content is at least about 10 times the carbon content.
Claim 4
Dependent Claim 21 words
An alloy as set forth in claim 1 wherein the titanium content is at least about five times the carbon content.
Claim 5
Dependent Claim 120 words
An alloy as set forth in claim 1 wherein the nickel content is between about 35.70 and about 46.17 percent by weight, the chromium content is between about 18.19 and about 25.28 percent by weight, the molybdenum content is between about 6.74 and about 9.66 percent by weight, the copper content is between about 4.37 and about 7.01 percent by weight, the titanium content is between about five times the carbon content and about 1.00 percent by weight, the sum of the tantalum and niobium content is between about ten times the carbon content and about 1.00 percent by weight, and the sum of the molybdenum and copper content is between about 11.7 percent and about 16.67 percent by weight.

References Cited (Backward Citations)

US2860968A Cited
US2938786A Cited
US3758294A Cited
US3758296A Cited
US3759704A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-10-28 1978-04-29 1978-10-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-28 1982-04-29 1982-10-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-28 1986-04-29 1986-10-29 $7700.00 Window Closed / Lapsed

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