F29
F29 is a designation in ASTM for the material held under material number 1.3917, also listed as Ni42. It is a material in the category Controlled-expansion nickel-iron alloys. We list 6 designations recorded for this grade, in the standards DIN / EN, UNS, ASTM, AFNOR and SRPS.
If you came for one of these
The most-used names for this grade.About Controlled-expansion nickel-iron alloys
Controlled-expansion nickel-iron alloys are materials formulated to provide predictable thermal expansion and good dimensional stability. They are used for glass-to-metal seals, electronic packages and precision instruments where limiting thermal mismatch is important.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
6 designations · 5 standards · nothing hidden- F29Indicative
- F30Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
5 elements on file · weight %What this alloy is
Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.
| Element | % by weight |
|---|---|
≤ 0.05 | |
≤ 0.3 | |
≤ 1 | |
41,0-43,0\n(40,0-43,0) | |
Balance |
The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other.
| Element | As publishedsource text, verbatim | Min% by weight | Max% by weight | Bound |
|---|---|---|---|---|
| C | ≤0,05 | — | 0.050 | Max |
| Si | ≤0,30 | — | 0.300 | Max |
| Mn | ≤1,00 | — | 1.000 | Max |
| Fe | Rest/Bal. | — | — | Balance |
| Ni | 41,0-43,0\n(40,0-43,0) | — | — | No numeric bound |
The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred.
Predicted transformation temperatures
Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, Cr, Mo.
Physical & mechanical properties
An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material.
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.3, a shared category, and a published range for Mn / Si that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade.
Looking for this grade under another name?
Search the catalogue by designation, material number or composition — every name on this page is itself a way in.