A3003 Alloy.
  ( Left) coarse grain-size, (Right) fine grain-size.

  The cause of enlarged particle is Mn and there are eight ways.

  Application of technology: aluminum circle,aluminum sheet,cookware,coil,non stick pan,pot.

Technical guidance about 40 quality problems on the board manufacturing process.

   Melting - casting - homogeneity -rolling - annealing.

   Bubble, coarse grain size, include, oxide, roll crown, crack, ear occurring, Macro structure,  etching etc .