Hot drawing of hardfacing alloys. Final report
- Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
The NOREM{trademark} iron-base hardfacing alloy provides outstanding resistance to galling (adhesive) wear and good corrosion resistance in diverse environments. However, because hardfacing alloys exhibit little ductility at room temperature, they are difficult to fabricate into wire. This EPRI project focused on hot drawing of a NOREM coil in an attempt to reduce its diameter to a sufficiently small value ({approximately} 0.062 in/1.6 mm) that it could be used as weld wire. Reduction of pieces of the coil from the starting diameter of {approximately} 0.25 in (6.4 mm) to {approximately} 0.08 in (2.0 mm) were achieved with a drawing schedule that decreased the diameter by {approximately} 15% at each step and provided intermediate annealing steps at {approximately} 1,100 C. Attempts to reduce the diameter further were largely unsuccessful for reasons that were difficult to pinpoint. This report describes the hot drawing process and an evaluation of swaging, which proved the only successful method of pointing the leading end of the wire so it could be placed through the die and gripped. This alloy was developed as a replacement for cobalt-base hardfacing alloys, particularly in nuclear plant valve applications.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Oak Ridge National Lab., Metals and Ceramics Div., TN (United States)
- Sponsoring Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 362507
- Report Number(s):
- EPRI-GC--108777
- Country of Publication:
- United States
- Language:
- English
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