Metal treatment – Compositions – Heat treating
Patent
1975-05-30
1976-04-27
Steiner, Arthur J.
Metal treatment
Compositions
Heat treating
295275, 295277, 72700, 75167, 148 115R, 148 127, 148 3Z, 164 76, B23K 1900
Patent
active
039532445
ABSTRACT:
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.
REFERENCES:
patent: 2049938 (1936-08-01), Anderson et al.
patent: 2142835 (1939-01-01), Betterton et al.
patent: 2159124 (1939-05-01), Betterton et al.
patent: 3706605 (1972-12-01), Newbury et al.
Greenwood, et al., "The Influence of Calcium on the Creep Characteristics of Lead", Metallurgic Vol. 39, No. 233, 3/49 pp. 241-245.
St. Joe Minerals Corporation
Steiner Arthur J.
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