P2. JML 4348B856 Attachment - K-Monel Heat Review.pdf

This is a vendor acknowledgement document regarding a K-Monel heat review that identifies suspect heat numbers from Special Metals Corporation (formerly INCO Alloys) of Huntington, West Virginia. The document details findings from investigations into mechanical property failures of NiCuAl (K-Monel) fasteners, where 80 heats were found to potentially not meet QQ-N-286 requirements due to insufficient aluminum content and yield strength issues. The aluminum concentration in toe portions was found to be as low as 2.0% with yield strengths around 40,000 PSI, below the required minimum of 2.3% aluminum and 90,000 PSI yield strength.

The document includes a comprehensive table listing 80 suspect K-Monel heat numbers and identifies seven approved laboratories for conducting strain rate tests on K-500 raw stock according to QQ-N-286 Revision G specifications. These laboratories include Huntington Alloys, Metallurgical Consultants Inc., Naval Surface Warfare Center, Teledyne Allvac, Mannesmann Rohrenwerke in Germany, Westmoreland Mechanical Testing, and ThyssenKrupp VDM USA. Vendors are prohibited from using material from the listed suspect heats and must contact contracting officers if suspect material is identified.