Investment Process

Flowserve Dayton Foundry is renowned for its commitment to quality castings developed through its investment process, commonly known as lost wax casting.

This process produces precise castings of unmatched geometric correctness, fine surface finishes, exceptional detail and tight tolerances. Flowserve lost wax castings permit economical design choices, keeping expensive finishing and machining operations at a minimum, or eliminating their need entirely.

The foundry produces commercial quality lost wax castings, even to ASTM Shrinkage Level II. From one-of-a-kind parts to production items, Flowserve can satisfy any customer requirements.

Investment Process Capabilities


Investment ProcessFlowserve pours stainless steel, nickel-based and cobalt-based alloys in accordance with several specifications, including ASTM. Custom alloys also can be produced.

Standards and Specifications

  • Stainless Steels: ASTM A217; A351; A743; A744; A747; A890; A995
  • Nickel Base: ASTM A494
  • Cobalt Base: AMS 5387
  • Heat Resistant Grades: ASTM A297


  • 300 lb (136 kg) and 1300 pound (590 kg)
    coreless induction furnaces

Maximum Weights

  • 200 lb (91 kg) gross; 150 lb (68 kg) net

Minimum Casting Wall Thickness

  • 3/32 in (2.381 mm) nominal; 1/16 in (1.587 mm) depending on part configuration


  • ±0.005 in/in (±0.005 mm/mm)

Surface Finish

  • 125-150 RMS (as cast)

Quality, Inspection, Testing

Investment ProcessA full range of laboratory, mechanical and non-destructive testing services is available as required.

Routine procedures include:

  • X-ray fluorescence spectroscopy
  • Leco carbon and gas (H, N, O) analysis
  • Mechanical testing (tensile and impact)

Miscellaneous Capabilities

  • Welders qualified to ASME Section IX Boiler and Pressure Vessel Code and ASTM A488
  • Blasting with sand; stainless steal shot; glass bead; aluminum oxide
  • Heat treating and quenching
  • Pattern, mold and core making
  • Rapid prototype process