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Identyfiy the metrial and its compotion

Question: 

Identyfiy the metrial and its compotion

A) X10Cr 18 Ni9 Mo 4 Si 2

B) XT72W18Cr4V1:

 

Answer: 

A) X10Cr 18 Ni9 Mo 4 Si 2 : High Alloy steel having carbon 0.10% , chromium 18%, nickel 9 % ,Molybdenum 4% & silicon 2% B) XT72W18Cr4V1: high speed tool steel having carbon 0.72% ,chromium 4% , tungsten 18% , vanadium 1%