GX40CrNiSi25-12
GX40CrNiSi25-12 is a material in the category Heat-resistant cast steels, held under material number 1.4837. We list 19 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, JIS, GB, GOST and ČSN. Its recorded composition includes C 0.3–0.5%, Si 1–2.5%, Cr 24–27%, Mn ≤ 2% and Ni 11–14%. Recorded mechanical properties include Rm 491 N/mm², Re 245 N/mm², A5 20% and Z 28%. Its recorded density is 7.8–7.85 g/cm³. Further recorded physical values: E 145–196 GPa, α 18.4 ·10⁻⁶/K and ρ el. 860 nΩ·m; several of these are temperature-dependent. Its weldability is recorded as good.
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
20 designations · 8 standards · nothing hidden- 1.4837Indicative
- GX40CrNiSi25-12This 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 |
|---|---|
0.3–0.5 | |
1–2.5 | |
≤ 2 | |
0.04 | |
0.03 | |
24–27 | |
≤ 0.5 | |
11–14 |
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 | 0,30-0,50 | 0.300 | 0.500 | Range |
| Si | 1,00-2,50 | 1.000 | 2.500 | Range |
| P | 0,04 | 0.040 | 0.040 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| Cr | 24,0-27,0 | 24.000 | 27.000 | Range |
| Mn | ≤2,00 | — | 2.000 | Max |
| Ni | 11,0-14,0 | 11.000 | 14.000 | 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.
Properties by condition
2 conditions · 11 valuessplav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% |
|---|---|---|---|---|
| to 100 | 491 | 245 | 20 | 28 |
splav| Temperature°C | Densityg/cm³ | Elastic modulusGPa | Thermal expansion coefficient10^-6/K | Electrical resistivitynΩ·m |
|---|---|---|---|---|
| 20 | 7.8 | 196 | — | 860 |
| 100 | — | — | 18.4 | — |
| 500 | — | 167 | — | — |
| 600 | — | 157 | — | — |
| 700 | — | 145 | — | — |
Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ.
Looking for this grade under another name?
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