Abstract
Sn-5 to 50 mass%Pb alloy billets were cast by the heated mold continuous casting (Ohno Continuous Casting) method developed by the authors. The surface quality, macrostructure, microstructure, tensile strength and cold rolling properties of the OCC billets were examined and compared with those of conventionally cast billets.The OCC billets had a smooth and mirror-like surface having high level surface brightness. It is constituted macroscopically of a unidirectionally solidified structure without equiaxed crystals and microscopically of aligned primary and eutectic phases. Wrought products rolled from conventional billets tend to exhibit edge cracking and surface irregularities as rolling progresses, however the products from the OCC billets were free from such defects. In addition, the OCC Sn-Pb alloy billets enable the high-quality productions of fine wires and thin sheets solders for ICs and LSIs.
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