4J42 round bar (Category: Low expansion iron-nickel alloy steel grade spot table).
4J42 round barClick on the avatar in the spot
4J42 related grade standards.
4J42 corresponding grades: 4J342, NI42 (China), UNS K94100, INVAR42, NIROMEI42, FEROVAL42NI, Glass Sealing42 (USA), Wnr. 1.3917, Vacodil42, Wakogir 42, Nickel-Ayilu 42 (Germany), Nilo42, NS42 (UK), YEF42, DF (Japan), FEN42, N42, N42TI (France, H (Russia), FENTI42 (International ISO).
4J42 Technical Standard: YB T 5235-2005, ASTM F30
4J42 Supply form: strip, plate, wire, pipe, flat bar, bar.
Experimental principle 4J42 alloy under the action of FeCB and HCI mixed etchants undergoes the following chemical reactions:
2fecb + fe->3fec12 e= （0.771+0.441） v>0
2fecb + ni-*2feck + nich e= （0.771 +0.250） v>0
The etching reaction proceeds spontaneously to the right.
4J42 Physical and Chemical Properties 4J42 Thermal Properties 4J42 Melting Temperature Range The melting temperature of the alloy is about 1430 [1,2]. 4J42 Thermal conductivity =146w/(m·℃)1,2]。4J42 Specific heat capacity The specific heat capacity of this alloy is 502J (kg).
4J42 linear expansion coefficient The flat ** expansion coefficient of the alloy specified in the standard is shown in Table 2-1. The flat ** expansion coefficient of the alloy is shown in Table 2-2. The expansion curve of the alloy is shown in Figure 2-1.
There is no difference in appearance to be distinguished according to the chemical composition.
4J29 is an expansion alloyIron-nickel-cobalt alloy?
4J29 alloy is also known as Kovar alloy. The alloy has a linear expansion coefficient similar to that of silicon-boron hard glass at 20 450, a higher Curie point, and good low-temperature microstructure stability. The oxide film of the alloy is dense and can be well wetted by glass. It does not interact with mercury and is suitable for use in instruments containing mercury discharge. It is the main sealing structural material of electric vacuum devices. It is used to make iron-nickel-cobalt alloy strips, bars, plates, and tubes that are matched and sealed with hard glass ceramics, and are mostly used in vacuum electronics, power electronics and other industries.
4J29 corresponding grade:
kovar|astm f15|k94610|nilo k
4J29 Executive Standard:
yb/t??5231-2005
4J29 Application Overview and Special Requirements:
This alloy is a typical Fe-Ni-Co hard glass sealing alloy that is commonly used internationally. It has been used by the aviation factory for a long time, and the performance is stable. It is mainly used for the glass sealing of electric vacuum components such as emission tubes, oscillation tubes, ignition tubes, magnetrons, transistors, sealed plugs, relays, lead wires of integrated circuits, chassis, shells, brackets, etc. In the application, the selected glass should be matched to the expansion coefficient of the alloy. The stability of the low-temperature microstructure is strictly tested according to the use temperature. Proper heat treatment should be carried out during processing to ensure that the material has good deep drawing properties. When using forgings, their air tightness should be strictly inspected.
Because of the cobalt content of Kovar alloy, the product is more wear-resistant.
Kovar is sealed with molybdenum glass, and the surface of the workpiece is generally required to be gold-plated.
4J29 Physical Properties:
Density: 817 grams cubic centimeters.
Resistivity: 046*cm².
Electrical conductivity: 2174 * 1000000 s/m
Thermal conductivity: 0046 card cm*s*
4J29 modulus of elasticity E=138GPA.