Lessons Learned

1. By using a single alloy that offers strength, corrosion- resistance and wear-resistance, the expensive and difficult dual-metal casting process is avoided. 

   • This lowers the direct production cost (by 20%) and produces more uniform castings with markedly reduced scrap rates. 

2. The modified duplex A890 alloy dramatically reduced in-service failure, down-time, and system repair/ replacement costs. 

   • In-service inspection of the duplex alloy cylinders over the six year production shows no significant wear and there have been no in-service failures. 

3. The single alloy design eliminated the need for chrome plating with the attendant cost, time, and reliability risk.  

   • But even more importantly, it helped the Navy meet the DoD mandated requirement to eliminate/reduce chrome plating in defense systems with its attendant environmental costs and hazards.

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