Profile: Vulcan Metal Group specializes in providing machining and manufacturing services. Iron-nickel alloy is 42% nickel and 58% iron. It is a silvery-white lustrous metal and belongs to the controlled expansion and low expansion alloy groups. Alloy 42 exhibits low, constant thermal expansion in temperatures up to 570°F. With tensile strength of 500, minimum yield strength of 300, and 30% and elongation. We are an ISO 9001 certified company.