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JIS H3300 C6872T/C6872T-O Aluminum Brass Tube/Copper Alloy Seamless Tube for Boiler Chemical Composition Al(%) Mn(%) Pb(%) Fe(%) Ni(%) Zn(%) Cu(%) 1.8-2.5 ≦0.2 ≦0.05 ≦0.06 0.2-1.0 ≧15 76.0-79.0 ...