4Cr10Si2Mo
4Cr10Si2Mo is a designation in GB for the material held under material number 1.4731, also listed as X40CrSiMo10-2. It is a material in the category Valve steels. We list 26 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, BS, AFNOR, UNE, JIS, GB, GOST, UNI, PN, MSZ, BDS and KS.
- Material no. 1.4731
- Category Valve steels · 14 grades
- Designations 26
If you came for one of these
The most-used names for this grade.About Valve steels
Valve steels are alloy steels developed for valve components exposed to heat, pressure, wear, and corrosive service conditions. They are characterised by combinations of strength, hardness, toughness, and resistance to oxidation or corrosion suited to the operating environment. Typical uses include engine valves and industrial valve parts where reliable performance and dimensional stability are required.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
26 designations · 13 standards · nothing hidden- 1Cr18Mn8Ni5NIndicative
- 4Cr10Si2MoIndicative
- S48140Indicative
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 |
|---|---|
0.35–0.45 | |
2–3 — | |
≤ 0.8 | |
0.04 | |
0.03 | |
9.5–11.5 | |
0.8–1.3 | |
0.5 |
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 | 0,35-0,45 | 0.350 | 0.450 | Range |
| Si | 2,00-3,00 | 2.000 | 3.000 | Range |
| P | 0,04 | 0.040 | 0.040 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| Cr | 9,50-11,5 | 9.500 | 11.500 | Range |
| Mn | ≤0,80 | — | 0.800 | Max |
| Ni | 0,5 | 0.500 | 0.500 | Exact |
| Mo | 0,80-1,30 | 0.800 | 1.300 | 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.
Properties by condition
6 conditions · 49 valuessteeljis| Delivery state | RmN/mm² | ReN/mm² | A% | Z% | aKJ/cm² | HB |
|---|---|---|---|---|---|---|
| Bars/Rods Quenching and tempering | 880 – 930 | 635 – 685 | 15 | 35 | 20 | — |
| Quenched and tempered | — | — | — | — | — | 262 – 269 |
steelnumber| Delivery state | HB |
|---|---|
| Quenched and tempered | 266 – 325 |
steelnumber| Delivery state | HB |
|---|---|
| Soft annealed | 300 |
splav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Ø 60 | 930 | 735 | 10 | 35 | 200 |
splav| Delivery state | HB |
|---|---|
| 40KH10S2M ( 40Х10С2М ) (annealing) , Bar GOST 5949-75 | 197 – 269 |
splav| Temperature°C | Densityg/cm³ | Elastic modulusGPa | Thermal expansion coefficient10^-6/K | Thermal conductivityW/(m·K) | Specific heat capacityJ/(kg·K) | Electrical resistivitynΩ·m |
|---|---|---|---|---|---|---|
| 20 | 7.62 | 214 | — | 17 | — | — |
| 100 | 7.61 | 211 | 10 | 18 | — | 906 |
| 200 | — | 205 | 11 | 20 | — | 958 |
| 300 | — | 202 | 11 | 22 | — | 1010 |
| 400 | — | 196 | 11 | 22 | 532 | 1062 |
| 500 | — | 187 | — | 24 | 561 | 1114 |
| 600 | — | 172 | — | 25 | 586 | 1166 |
| 700 | — | 151 | — | 26 | — | 1216 |
| 800 | 7.43 | 129 | 11 | — | — | — |
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.
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 / 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.