WAlnico
WAnthracite iron
WAustempered Ductile Iron
WCast iron
WCompacted graphite iron
WDuctile iron
WFernico
WFerrovanadium
WGray iron
WInvar
WIron hydride
WIron–hydrogen alloy
WIron–nickel alloy
WKanthal (alloy)
WKovar
WLedeburite
WMalleable iron
WOregrounds iron
WOsmond process
WPig iron
WSpark testing
WSpiegeleisen
WWrought iron