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Lowering the tin content of secondary leaded tin bronze by replacement with lead or zinc.

Cole-ER Jr.; Higley-LW Jr.; Holman-JL
NTIS: PB 211 945 :1-12
Laboratory heats of an 80 percent copper, high-leaded, tin-bronze alloy, similar to Brass and Bronze Ingot Institute (BBII) alloy 3a, were made with reduced tin content to determine whether an alloy comparable to BBII alloy 3a could be produced using less tin to aid in conserving this strategic metal. The tin content was lowered from 10 percent to 8 percent and 5 percent (nominal values), respectively, and the reduction in tin was offset by either increasing the lead content or adding zinc. Mechanical properties, machinability, and corrosion characteristics of the resultant alloys were investigated, and the mechanical properties were compared with BBII typical values and American Society for Testing and Materials (ASTM) minimums for high-leaded, tin-bronze alloy. Results indicate that the tin content of this alloy could be reduced approximately 1 percent (the difference between the 8.4 percent actual tin composition obtained and the 9.3 percent BBII minimum) without seriously affecting the desired properties. Results also show that the tin content can be reduced without significantly increasing the chances of rejects for mechanical property failures, which might result from normal variations in the casting process.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7659
NIOSH Division
Source Name
NTIS: PB 211 945