A controlled expansion alloy, consisting of 42% Nickel, balance Iron; used in a wide variety of electronic application, lead frames, especially for glass and ceramic seals. Alloy 42 Products Bozhong Group stocks alloy 42 in a variety of forms and dimensions. Below are most of the standard stock form/sizes. If you do not see the size or form of alloy 42 that you require, please call one of our materials experts; our sales people are very knowledgeable and can assist you. We can cut, slit, shear, or center less grind alloy 42 to your exact specifications, and we also have tremendous versatility when it comes to custom sizes, packages, and unusual materials. Alloy 42 Rod -- Made to Your Custom Size Alloy 42 Sheet Annealed Alloy 42 Sheet Thickness Alloy 42 Sheet Thickness .020” Alloy 42 Sheet .050” Alloy 42 Sheet .030” Alloy 42 Sheet .060” Alloy 42 Sheet .040” Alloy 42 Sheet .100” Alloy 42 Sheet Alloy 42 Plate Annealed Alloy 42 Plate Thickness .270” Alloy 42 Plate Alloy 42 Strip/Coil Annealed Alloy 42 Strip/Coil Thickness Alloy 42 Strip/Coil Thickness .010” Alloy 42 Strip/Coil .030” Alloy 42 Strip/Coil .020” Alloy 42 Strip/Coil .040” Alloy 42 Strip/Coil Applications Glass to metal seals for a wide variety of electronic tubes, hermetic packages, and automotive and industrial lamps. Alloy 42 Properties Alloy 42 Physical Properties Density lb/cu in 0.293 Specific Gravity 8.12 Curie Temp °F 716 °C 380 Melting Point °F 2600 °C 1427 Electrical Resistivity Micro-ohm-cm 68 ohm-cir mil/ft 400 Thermal Conductivity W/cm °C 0.11 BTU-in/sq. ft-hr- 74.5 Specific Heat Cal/g- °C 0.12 BTU/lbm- °F 0.12 Thermal Expansion ppm / °F (75°F to 842°F) 3.9 ppm / °C (25°C to 450°F) 7.0 Alloy 42 Mechanical Properties Tensile Strength ksi 82 MPa 566 Yield Strength ksi 34 MPa 235 Elongation % in 2 in. 30 Typical Hardness Ann. Rockwell HRB 80 Modules of Elasticity Mpsi 21.5 kMPa 148 Alloy 42 Chemistry maximum % unless noted Iron Bal Nominal Nickel 41 Nominal Cobalt -- Carbon 0.05 Silicon 0.30 Sulfur 0.025 Chromium 0.025 Alloy 42 Specifications ASTM F-30 MIL 1-23011 CL 5 AMS 1-23011 CL 5 Alloy 42 Linear Coefficient of Thermal Expansion Degree C Degree C 30-100 4.8 30-450 6.7 - 7.4 30-150 4.6 30-475 -- 30-200 4.5 30-500 8.0 30-250 4.5 30-525 -- 30-300 4.0 - 4.7 30-550 8.8 30-325 4.7- 30-600 9.5 30-350 5.0 30-700 10.5 30-375 5.5 30-800 11.4 30-400 6.0 30-900 12.3 30-425 -- 30-1000 13.2 Model GB ASTM DIN BS AFNOR New grades Old grades 4J36（Invar 36) UNS K93600 W.Nr.1.3912 X1NiCrMoCu Fe-Ni36 Kovar(Alloy K) UNS K94610 1.3981 Nilo 42(Alloy 42) UNS K94100 1.3917