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ASTM B387 Per Kg China Manufacturer Molybdenum Boat Chemical Composition (Impurities no more than %) Ti 0.4~0.5 P 0.001 Zr 0.06~0.12 Mg 0.0001 Fe 0.002 Ni 0.001 Si 0.001 Ca 0.0007 Pb 0.001 Cu 0.0003 C ...