X12CrNiMo12
X12CrNiMo12 is a material in the category High-temperature steels / aviation variant, held under material number 1.4939. Its recorded composition includes C 0.08–0.13%, Cr 11–12.5%, Mn 0.5–0.9%, Ni 2–3% and Mo 1.5–2%. We list 4 designations recorded for this grade, in the standards DIN / EN, UNS and AISI / SAE. Its recorded density is 7.85 g/cm³.
If you came for one of these
The most-used names for this grade.About High-temperature steels / aviation variant
High-temperature aviation steels are heat-resistant materials designed to retain strength and structural stability during prolonged exposure to elevated temperatures. Their alloying provides resistance to creep, oxidation, and thermal degradation, making them suitable for aircraft engine and other hot-section components.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
5 designations · 3 standards · nothing hidden- X12CrNiMo12This grade’s own name
- X12CrNiMoN12This grade’s own name
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
10 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 |
|---|---|
0.08–0.13 | |
≤ 0.35 | |
0.5–0.9 | |
0.025 | |
0.02 | |
11–12.5 | |
1.5–2 | |
2–3 | |
0.25–0.4 | |
0.02–0.04 |
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 | 0,08-0,13 | 0.080 | 0.130 | Range |
| N | 0,020-0,040 | 0.020 | 0.040 | Range |
| Si | ≤0,35 | — | 0.350 | Max |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,02 | 0.020 | 0.020 | Exact |
| V | 0,25-0,40 | 0.250 | 0.400 | Range |
| Cr | 11,0-12,5 | 11.000 | 12.500 | Range |
| Mn | 0,50-0,90 | 0.500 | 0.900 | Range |
| Ni | 2,00-3,00 | 2.000 | 3.000 | Range |
| Mo | 1,50-2,00 | 1.500 | 2.000 | Range |
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
This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here.
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.
Looking for this grade under another name?
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