33240 - Steel investment castings
3324063 - - Steel investment castings: Carbon + Low alloy
3324064 - - Steel investment castings: Alloy + Stainless
3324066 - - Steel investment castings: Stainless steel
3324067 - - Steel investment castings: Hi-temp metal fastings (Iron, Nickel, or Cobalt-base alloys)
3324XX0 - - Steel investment foundries (Miscellaneous - Volume)
3324XX2 - - Steel investment foundries (Miscellaneous - Speciality)