Saturnite

Saturnite is a space-age, man-made ceramic-like alloy developed in the Big MT for use in a variety of fields, including cosmic knives, the D-25A power fist, experimental armor plating, artillery shells , and many other items.

Characteristics
"The alloy that makes up the Pre-War kitchen knives is unknown, and seems to have decayed in contact with the toxic cloud."

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Saturnite has a few unique characteristics such as its uncanny sharpness, its ability to hold an edge, and its ability to retain heat for extended periods of time. Like other ceramics, it has a very high strength-to-weight ratio. However, the alloy seems to decay in contact with the toxic cloud of Sierra Madre.