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Superalloy Recycling 1976-1986.
Ppr in Superalloys 1988 :367-376
This paper indicates that about 55 million lb of clean and contaminated superalloy scrap were processed in 1986; about 92 pct (50 million lb) went to domestic buyers, and 8 pct (4.3 million lb) was exported. About 93 pct (4.0 million lb) of the exported material was refinery-destined grindings and 7 pct (0.3 million lb) was vacuum-melting-grade superalloy scrap. Of the 55 million lb of superalloy scrap processed in 1986, about 70 pct (38.5 million lb) was recycled into the same superalloy, 20 pct (11 million lb) was downgraded, and 10 pct (5.5 million lb) was sold to refineries. The average element content of superalloy scrap processed in 1986 was about 44 pct ni, 16 pct cr, 5 pct CO, 2 pct cb, less than 1 pct each of mn and ta, and nil for re. The remaining 30 pct was primarily al, fe, mo, ti, w, and other minor constituents. The major changes in the superalloy recycling industry since 1976 were the introduction of premelted superalloy scrap as a material supply source and increased use of closed-loop recycling agreements among forger-scrap processor-alloy producer-engine manufacturer groups. Since 1976 inconel 718 has become the predominantly produced superalloy.
Ppr in Superalloys 1988 (Proc 6th Int Symp on Superalloys, 9/18- 22/88) Met. Society, Pp 367-376
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division