要看你具体是什么金属材料了，有些金属Pb是有豁免的
另外还要考虑这个金属的电镀情况
正常情况下只要不是刻意添加都不会有太大问题
6a
Lead as an alloying element in steel for machining
purposes and in galvanized steel containing up to
0.35 % lead by weight
6b
Lead as an alloying element in aluminum
containing up to 0.4 % lead by weight
6c
Copper alloy containing up to 4 % Lead by weight
