GX25CrNiSi18-9
GX25CrNiSi18-9 is a material in the category Heat-resistant cast steels, held under material number 1.4825. We list 12 designations recorded for this grade, in the standards UNS, AISI / SAE, JIS and ČSN. Its recorded composition includes C 0.15–0.35%, Si 0.5–2.5%, Cr 17–19%, Mn ≤ 2% and Ni 8–10%. Its recorded density is 7.85 g/cm³.
If you came for one of these
The most-used names for this grade.About Heat-resistant cast steels
Heat-resistant cast steels are cast ferrous alloys formulated for service at elevated temperatures, where resistance to softening and thermal degradation is important. They are used for furnace components, heat-treatment equipment and other high-temperature plant parts that require cast shapes and dependable mechanical performance during heating.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
13 designations · 5 standards · nothing hidden- GX25CrNiSi18-9This 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
8 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 |
|---|---|
0.15–0.35 | |
0.5–2.5 | |
≤ 2 | |
0.04 | |
0.03 | |
17–19 | |
≤ 0.5 | |
8–10 |
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 | 0,15-0,35 | 0.150 | 0.350 | Range |
| Si | 0,50-2,50 | 0.500 | 2.500 | Range |
| P | 0,04 | 0.040 | 0.040 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| Cr | 17,0-19,0 | 17.000 | 19.000 | Range |
| Mn | ≤2,00 | — | 2.000 | Max |
| Ni | 8,00-10,0 | 8.000 | 10.000 | Range |
| Mo | ≤0,50 | — | 0.500 | Max |
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.
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.4, a shared category, and a published range for Cr / Ni 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.