Nuclear valve manufacturer selects stainless forgings
Journal Article
·
· Met. Prog., v. 109, no. 2, p. 10
OSTI ID:4041471
Forged type 316 stainless steel components for nuclear valves are described. Automatic plasma arc welding with powder filler alloys is employed for hardfacing. Seat ring forgings are surfaced four-at-a-time with Stellite No. 156 in a sequential manner to minimize heat input to the individual components. After cladding and machining, seat rings are welded into the valve body using a semiautomatic, hot-wire gas tungsten-arc process. Disc faces and guide slots are surfaced with Stellite No. 6. The valve stem is machined from 17-4PH forged bar stock in the H-1100 condition. The heat treatment is specified to minimize pitting under prolonged exposure to wet packing. A 12 rms (0.3 $mu$m) surface finish minimizes tearing of the packing and subsequent leakage. The link and stem pin are SA 564 Grade 660 (in the H-1100 condition) and ASTM A637 Grade 718 respectively. (JRD)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-33-030095
- OSTI ID:
- 4041471
- Journal Information:
- Met. Prog., v. 109, no. 2, p. 10, Journal Name: Met. Prog., v. 109, no. 2, p. 10; ISSN MEPOA
- Country of Publication:
- United States
- Language:
- English
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