K-MONEL.pdf

This document is a Vendor Acknowledgement of K-Monel Heat Review for Special Metals Corporation's nickel-copper-aluminum alloy (K-Monel) materials. The document reveals recent investigations into mechanical property failures of fasteners manufactured from NiCuAl (K-Monel) material produced at the Huntington, West Virginia facility, specifically addressing eighty (80) heats of material that may not meet mechanical property requirements of QQ-N-286 throughout the heat production process.

The document provides a comprehensive list of 48 suspect K-Monel heat numbers that vendors are prohibited from providing raw stock or finished products for use. The affected material shows insufficient aluminum content and an inability to consistently attain the required minimum yield strength. Vendors are instructed to review their in-stock and in-process K-Monel material and, if they have any of the listed heat numbers, are prohibited from providing raw stock or finished products. For any suspect heats, vendors must contact the PHNS & IMF contracting officer for adjudication of the material. The document also lists seven approved laboratories that have conducted strain rate tests on the K-Monel raw stock, including facilities in the United States, Germany, and locations associated with Naval Surface Warfare Center and various metallurgical research institutions.