Alloy 475
Alloy 475 at 20 ~ 400 degrees Celsius temperature range, with the expansion coefficient of similar soft glass, used for matching with corresponding soft glass sealing.This kind of alloy containing chromium, after oxidation treatment, the alloy surface generated very dense oxide film, combined with matrix and firm, and soft glass and invasive good.Therefore, to get the sealing side of high strength.Is an important sealing structure in electric vacuum industry material.
Chemical Composition in %, Invar
| C | P | S | Mn | Si | B | Al | Ni | Cr | Fe |
|---|---|---|---|---|---|---|---|---|---|
| ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | - | - | - |
| 0.05 | 0.020 | 0.020 | 0.40 | 0.30 | 0.02 | - | 46.0~48.0 | 5.0~6.0 | bal |
Basic physical constants and mechanical properties of the alloy:
| Brand | Density (g / cm3) | Resistivity(μΩ.m) | Curie point(w/m.c) |
|---|---|---|---|
| Alloy 475 | 8.18 | 0.90 | 18.0 |
Coefficient of linear expansion, Typical expansion character(10 -6 / ºC )
| Temperature range | 20~100 | 20~200 | 20~300 | 20~400 | 20~500 | 20~550 | 20~600 |
|---|---|---|---|---|---|---|---|
| Expansion coefficient | 9.0 | 9.0 | 8.9 | 9.6 | 10.9 | 11.4 | 11.8 |
Resistance temperature coefficient(μΩ.m)
| Brand | 20~50ºC | 20~100ºC | 20~200ºC | 20~300ºC | 20~400ºC | 20~500ºC |
|---|---|---|---|---|---|---|
| Alloy 475 | 0.95 | 0.9 | 0.85 | 0.80 | 0.70 | 0.60 |
A nickel-iron-chromium controlled-expansion alloy containing 47% nickel. It is designed to have thermal-expansion characteristics that closely match those of the soft glasses of the lead or soda-lime type up to their annealing temperatures. The alloy is a particularly good match with L92 glass. Used for various glass-to-metal seals and for anode-cavity caps in television tubes.