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Status of ASME Code Approval for PM/HIP Near Net Shapes

  • : Novotnak, D1
  • : 1Carpenter Powder Products
  • : PDF Download
  • : 2012

Abstract

The use of PM/HIP near net shapes for critical applications has been increasing for a number of years, particularly for off-shore oil industry components. Various programs have demonstrated the capability of this technology to minimize quality issues, improve inspectability, reduce raw material input, decrease machining time and in many cases reduce cost. ASTM has recognized specifications for producing a variety of stainless steels and alloy steels using the PM/HIP process. However, the ASME Boiler and Pressure Vessel Codes currently do not allow the use of PM/HIP near net shape produced components. To overcome this obstacle, the Electric Power Research Institute (EPRI) initiated a program teaming component manufacturers and valve customers to prepare a proposed ASME Code Case request to approve the use of PM/HIP valve components in nuclear and fossil fuel applications. Alloys selected for the program included Type 316L stainless steel for nuclear applications and the martensitic Grade 91 alloy for fossil fuel applications. The purpose of this presentation is to review the status of this program and present data on the evaluation of large PM/HIP valves of each material.
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