On Thursday, April 20, 2017 at 5:50:33 PM UTC-4, Asaad Kadhem wrote:
Thank Mr.Ed Huntress ...I read that and your words very true but I need some one who is expert in casting in the workshops because in practice the melt and cast very difficult

This is more complicated than you're reading here. For over 100 years, they've made copper/chromium alloys by melting, but they achieved only about 0.5% chrome that way. Higher alloys, up to 10%, have been achieved by aluminothermic reaction (like thermite).

You need the papers. Don't assume you can just dissolve chromium into molten copper and come up with a 1.5% alloy.

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Ed Huntress