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C4641属于日标锡黄铜，执行标准：JIS H3250-2006
C4641锡黄铜棒性能与C4622相近，可焊性能.耐蚀性能和冷加工性能好，C4641锡黄铜在造船工业中用于制造与海水、汽油等接触的零件，因此C4641也被称作海军黄铜。
C4641日标锡黄铜化学成分如下图：
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