Tantalum Spring is made of tantaloy "61" metal wire, NRC91 or 10% tungsten, 90% tantalum alloy. (or 7 ... 5% tungsten, 90% Ta) Tantaloy Inlet Spring is made of tantaloy "61" metal wire, NRC91 or 10% tungsten, 90% tantalum alloy, ... used for chemical process equipment including heating and cooling coils, heat exchangers, condensers, reaction vessels, leaf springs and bellows. Tantalum alloy wire Spring For ...