I would like to know what criteria can let me know whether I meet quality requirements. See copper is mainly from what aspects?Is there any way to judge from the appearance?
HPb57-3, but also in the industry are familiar with the A stick (Cu>57, Pb:3), A stick is the most widely used in the domestic brass bar, better than it has day standard C3771, GB 59-1 (HPb59-1), such as GB 59-1 requirements are Cu:57-59, Pb
HPb57-3, but also in the industry are familiar with the A stick (Cu>57, Pb:3), A stick is the most widely used in the domestic brass bar, better than it has day standard C3771, GB 59-1 (HPb59-1), such as GB 59-1 requirements are Cu:57-59, Pb
HPb57-3, but also in the industry are familiar with the A stick (Cu>57, Pb:3), A stick is the most widely used in the domestic brass bar, better than it has day standard C3771, GB 59-1 (HPb59-1), such as GB 59-1 requirements are Cu:57-59, Pb
