Nickel Iron Alloy 48 UNS K94800/ Nilo 48 ASTM F30 ; ( Composition (Nominal): Ni48 ; Fe Balance ; )Alloy 48 (Nilo 48) is a low expansion Nickel-Iron alloy. The coefficient of thermal expansion of this metal is designed to suit the CTE of soft lead and soda lime glasses. High Inflection point. Its service temperature goes as high as up to 450oC or 840oF. : (Product availability and request a QUOTE!