P1. JML Attachment - 5078B854 - SCREW, CAP - K-Monel Heat Review.pdf

This document is a Vendor Acknowledgement of K-Monel Heat Review for nickel-copper-aluminum alloy (K-Monel) fasteners manufactured by Special Metals Corporation. The review addresses mechanical property failures discovered in eighty (80) heat treatments of K-Monel material produced in Huntington, West Virginia, which did not meet the mechanical property requirements of QA-N-286. The investigation revealed issues with aluminum content and yield strength, with material showing an aluminum concentration inconsistent with production standards and yield strength below specified minimums.

The document lists a comprehensive table of suspect K-Monel heat numbers and provides requirements for K-Monel raw stock testing. It specifies that all nickel-copper-aluminum alloy raw stock must be procured according to QQ-N-286 Revision G with slow strain rate tests conducted by several approved laboratories, including Huntington Alloys, Metallurgical Consultants, Naval Surface Warfare Center, Teledyne Alvac, and Mannesmann Rohrenwerke. Vendors are prohibited from providing raw stock or finished products made from the listed suspect heat numbers and are instructed to contact PHNS & IMF contracting officers for further adjudication of the material.