Pb-O.11% Ca-O.57% Sn Alloy

Alloy name: Pb-O.11% Ca-O.57% Sn
Diagram No.: 1184
Type of diagram: TTA
Chemical composition in weight %: O.11% Ca, O.57% Sn, balance is Pb
Alloy group: Lead-based alloys
Note: Typical Temperature—Transformation diagram of Pb—O.11 wt% Ca—O.57 Wt% Sn alloy. Zone A: discontinuous transformation. Zone B: continuous precipitation ofPb(1-x)SnCa. The curves in Fig. highlight elearly the peritectic region of the Pb—Ca system (0.O7—0.08% Ca) as the most appropriate for casting grids with high mechanical properties with the addition of considerable amounts of tin as well (above 1.0% Sn). However, there is a second important requirement to alloys to be used for casting grids, namely, to harden rapidly so that a high rate of the technological process of grid manufacture could be sustained. Alloys with O.08-0.l2% Ca and 0.3—0.6% Sn are most commonly used for VRLA batteries for stand-by and telecommunication service. These alloys harden rapidly and the cast grids can be handled and processed further after a short ageing time at room temperature. Sometimes, battery manufacturers tend to make a compromise between grid parameters and production process duration. The mechanical properties of grids cast from Pb—Ca—Sn alloys depend very much on the technology of their manufacture and the subsequent treatment. One possible method to improve the mechanical parameters of Pb—Ca—Sn alloys is by rolling the material after casting.
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