1.4957
1.4957 is the material number of the grade also listed as GX15CrNiCo21-20-20. It is a material in the category Special steels for aviation and aerospace. We list 6 designations recorded for this grade, in the standards DIN / EN, UNS and SAE AMS.
- Material no. 1.4957
- Category Special steels for aviation and aerospace · 39 grades
- Designations 6
If you came for one of these
The most-used names for this grade.About Special steels for aviation and aerospace
Special steels for aviation and aerospace are engineered steels designed to provide controlled mechanical properties and reliable performance in demanding service. Their alloying and heat-treatment capabilities support components that require a combination of strength, toughness and fatigue resistance, including aircraft structures and engine parts.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
6 designations · 3 standards · nothing hiddenEvery designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
12 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 |
|---|---|
≤ 0.2 | |
≤ 1 | |
1–2 | |
0.035 | |
0.025 | |
20–22.5 — | |
2.5–3.5 | |
19–21 — | |
2–3 | |
18.5–21 | |
0.75–1.25 | |
0.1–0.2 |
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 | ≤0,20 | — | 0.200 | Max |
| N | 0,10-0,20 | 0.100 | 0.200 | Range |
| Si | ≤1,00 | — | 1.000 | Max |
| P | 0,035 | 0.035 | 0.035 | Exact |
| S | 0,025 | 0.025 | 0.025 | Exact |
| Cr | 20,0-22,5 | 20.000 | 22.500 | Range |
| Mn | 1,00-2,00 | 1.000 | 2.000 | Range |
| Co | 18,5-21,0 | 18.500 | 21.000 | Range |
| Ni | 19,0-21,0 | 19.000 | 21.000 | Range |
| Nb | 0,75-1,25 | 0.750 | 1.250 | Range |
| Mo | 2,50-3,50 | 2.500 | 3.500 | Range |
| W | 2,00-3,00 | 2.000 | 3.000 | 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?
Search the catalogue by designation, material number or composition — every name on this page is itself a way in.