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  • Users: mmcastahd
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  1. mmcastahd

    Late rising in feeders of ASTM B148 C95500 castings.

    Castings weight 120 Kg, Pouring Temp - 1187o C. Melting in Induction medium frequency furnace. Ceramic filter of 10 ppi was used. Marble grit plunging was used to remove gas for 4 min approximately in a melt of 170 Kg and Mg was used in ladle for degassing. Furnace sample was good but late...
  2. mmcastahd

    Acid Pickling of ASTM A351 GR: CF3M

    While acid pickling of castings made of grade cf8, cf8m ,cf3m, etc a kind of black deposition on the surface and inside the bore of casting is observed which gives a bad look and is tough to remove. Acid used is HNO3:HCl:H2O - 2:1:1 and dipped for approximately 30 to 40 min. please advice A M...

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