... about HB200,high hardness cast iron HRC 50-64,powder metallurgy work-piece,thermal spray coating work-piece etc.4.samples: we will ... about HB200,high hardness cast iron HRC 50-64,powder metallurgy work-piece,thermal spray coating work-piece etc.4.samples: we will ... about HB200,high hardness cast iron HRC 50-64,powder metallurgy work-piece,thermal spray coating work-piece etc.4.samples: we will ...