If I have master alloy contained Cu-3Cr-6Ni-2Si as cast I need to calculate how can I change the percent Wt.% of Cr to half or 1.5 Wt.% by additive an y element to melt ...Cu or Si or Ni how can change the ration of melt by ca lculation to melt alloy ....can I change the Si content or Ni content ....I need any help calculation in melt and cast