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US 3,953,244 AGranted
Method of fabricating stable wrought lead-calcium-tin alloys by means of cold working
AssigneeSt. Joe Minerals Corporation
InventorRaymond D. Prengaman
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AssigneeSt. Joe Minerals Corporation
InventorRaymond D. Prengaman
Estimating the term…
Stable wrought lead-calcium-tin alloys can be prepared by casting an alloy of lead having a calcium content of from about 0.02% or 0.03% to about 0.1% by weight and having a tin content such that the tin to calcium weight ratio or relative tin content is from about 7:1 to 10:1 and preferably is more than 10:1 up to about 100:1, with the proviso that the absolute tin content be from about 0.3% to about 2.0%; and thereafter cold working the casting at a time period of within about 24 hours after casting for the lead-calcium-tin alloys having a tin to calcium weight ratio of from about 7:1 to 10:1 and within about 48 hours after casting for the lead-calcium-tin alloys having a tin to calcium weight ratio of from more than 10:1 up to about 100:1. Aged work pieces heated sufficiently to dissolve the precipitated calcium phases can be similarly treated.
A process for the preparation of stable wrought alloys of lead which comprises casting an alloy consisting essentially of from about 0.02% to about 0.1% by weight of calcium, tin in an amount such that the tin to calcium weight ratio or relative tin content is from about 7:1 to 10:1 and the absolute tin content is from about 0.3% to about 1.0% by weight, and the balance substantially lead;
A process for the preparation of stable wrought alloys of lead which comprises casting an alloy consisting essentially of from about 0.02% to about 0.1% by weight of calcium, tin in an amount such that the tin to calcium weight ratio or relative tin content is from more than 10:1 up to about 100:1 and the absolute tin content is from about 0.3% to about 2.0% by weight, and the balance substantially lead;
A process for the preparation of stable wrought alloys of lead which comprises continuously casting an alloy consisting essentially of from about 0.03% to about 0.1% by weight of calcium, tin in an amount such that the tin to calcium weight ratio or relative tin content is from 10:1 up to about 25:1 and the absolute tin content is from about 0.3% to about 2.0% by weight, and the balance substantially lead;
A process for the preparation of stable wrought alloys of lead which comprises heating an aged work piece of an alloy consisting essentially of from about 0.02% to about 0.1% by weight of calcium, tin in an amount such that the tin to calcium weight ratio or relative tin content is from about 7:1 to 10:1, and the absolute tin content is from about 0.3% to about 1.0% by weight, and the balance substantially lead, said heating being at a temperature and for a time sufficient to place a substantial portion of the calcium-containing phases in solid solution in the lead;
A process for the preparation of stable wrought alloys of lead which comprises heating an aged work piece of an alloy consisting essentially of from about 0.02% to about 0.1% by weight of calcium, tin in an amount such that the tin to calcium weight ratio or relative tin content is from more than 10:1 up to about 100:1 and the absolute tin content is from about 0.3% and about 2.0% by weight, and the balance substantially lead, said heating being at a temperature and for a time sufficient to place a substantial portion of the calcium-containing phases in solid solution in the lead;
Dependencies are inferred from the claim text.