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JIS ASTM 70/30 CuZn37 CuZn40 C6782 Seamless Brass Tube/Pipe Material GB standard H96,H90,H85,H80,H70,H68,H65,H63,H62,H59,etc ASTM standard C21000,C22000,C22600,C23000,C24000,C26000, C26130,C26800...