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100-270Mesh Spherical Cast WC Powder Used For Oil Tools(CTC-S) Chemicals compositons: Grade W T.C F.C Fe Ti MO+CO+Ni Cr Vi SI BD20401 Balance 3.8-4.2 ≤0.08 ≤0.5 <0.1 <0.2 <0.1 <0.05 <0.02 Micro...