ARMCO irons
| Physical size | Guide values |
|---|---|
| Initial permeability: | 300-500 |
| Permeability: | 2000-20000 |
| Coercive field strength : | 15 - 160 A / m |
| Saturation induction : | 2.15 T |
| Physical size | values |
|---|---|
| Density at 20 ° C: | 7.86 kg / dm³ |
| Melting point : | 1536 ° C |
| Linear thermal expansion coefficient temperature range 0 ° C - 100 ° C: |
12 · 10 −6 1 / ° C |
| Young's modulus : | 207 GPa |
ARMCO-Eisen is the trade name or a trade mark of technically pure iron with a purity of 99.8 to 99.9 percent.
It is a soft and tough material which, due to its purity, has a low coercive force , high magnetic saturation and good electrical conductivity .
It was developed in 1909 by the then American Rolling Mill Company (ARMCO) by exploiting the reaction of pig iron with iron ore with the addition of scrap steel in the Siemens-Martin furnace .
With a history spanning more than 100 years, ARMCO pure iron is still an important and up-to-date product today due to its versatility. ARMCO pure iron is used z. B. as welding and igniter wire, as shielding in X-ray machines and magnetic resonance tomographs and for magnetic constant field applications such as relay parts, pole pieces , yokes and armatures .
ARMCO pure iron is characterized by the following properties:
- high saturation magnetization
- low coercivity and high remanence
- high permeability , maximum value at medium induction
- electrical conductivity almost like pure iron, typ. 9.1 · 10 6 S / m
- good acid resistance
Web links
- aksteel.de: Applications of ARMCO irons