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The Invar Ingot is a metal ingot added by Thermal Expansion and GregTech. It can be used in place of Refined Iron to make Mixed Metal Ingots, doubling the output and conserving Bronze/Brass and Tin, and is most efficient when using a Pulverizer to process Iron as it produces Pulverized Ferrous Metal as a secondary product.
Alternatively they can be made in an Induction Smelter by combining 2 Iron Ingots and one Ferrous Ingot at a cost of 240 MJ, giving 3 Invar Ingots, or in a Smeltery with an Ingot Cast.
Invar Ingot can be used to craft the following items: