33151M Ferrous Metal Foundries

This industry comprises establishments primarily engaged in the following North American Industry Classification System (NAICS) industries:

  1. 331511 Iron Foundries;
  2. 331512 Steel Investment Foundries; and
  3. 331513 Steel Foundries (except Investment).

331511 Iron Foundries

This industry comprises establishments primarily engaged in pouring molten pig iron or iron alloys into molds to manufacture castings (e.g., cast iron manhole covers, cast iron pipe, cast iron skillets). Establishments in this industry purchase iron made in other establishments.

331512 Steel Investment Foundries

This industry comprises establishments primarily engaged in manufacturing steel investment castings. Investment molds are formed by covering a wax shape with a refractory slurry. After the refractory slurry hardens, the wax is melted, leaving a seamless mold. Investment molds provide highly detailed, consistent castings. Establishments in this industry purchase steel made in other establishments.

331513 Steel Foundries (except Investment)

This industry comprises establishments primarily engaged in manufacturing steel castings (except steel investment castings). Establishments in this industry purchase steel made in other establishments.