的成交记录。银元材质珍贵，艺术价值高，由贵重金属或白银合金铸造，制作。
Transaction record. Silver precious material, high artistic value, cast by the precious metals or silver alloy production.
可以用于铸造的材料类型有：铝合金、青铜、工具钢、不锈钢、钨铬钴合金、镍基合金和贵金属。
Thee types of materials that can be cast are aluminum alloys, bronzes, tool steels, stainless steels, stellite, hastelloys, and precious metals.
结果表明：经金属型铸造的铜合金密度达到理论密度的99 91%。
The results show that the copper alloy density by permanent-mold casting attains 99.91% of theory density.
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