... and best service 100% factory ASTM Invar 36 nickel bar rod 1.Chemical Composition % AlloyGradesChemical Composition % CPSMnSiNiCoFeNot more than≤Invar360 ... semi-finished specimen heated to 840 ± 10 oC, insulation 1h, water quenching, and then processed into finished specimen, at 315 ± 10 ... oC, insulation 1h with the furnace cooling or air-cooled.≤1.5----- 3.Alloy ...