F.1740-41
F.1740-41 is a designation in UNE for the material held under material number 1.8509, also listed as 41CrAlMo7-10. It is a material in the category Nitriding steels. We list 44 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, SAE AMS, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, SRPS and KS.
- Material no. 1.8509
- Category Nitriding steels · 11 grades
- Designations 44
If you came for one of these
The most-used names for this grade.About Nitriding steels
Nitriding steels are alloy steels designed for nitriding, a surface-hardening treatment that produces a hard, wear-resistant surface while retaining a tough supporting core. They are used for gears, shafts, dies and other components requiring resistance to wear, repeated loading and dimensional change in service.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
44 designations · 17 standards · nothing hidden- 41CrAlMo7Indicative
- CrAIMo7Indicative
- F.174Indicative
- F.1740Indicative
- F.1740-41Indicative
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 |
|---|---|
0.38–0.45 | |
≤ 0.4 | |
0.4–0.7 | |
0.025 | |
0.035 | |
1.5–1.8 | |
0.2–0.35 | |
0.8–1.2 |
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 | 0,38-0,45 | 0.380 | 0.450 | Range |
| Al | 0,80-1,20 | 0.800 | 1.200 | Range |
| Si | ≤0,40 | — | 0.400 | Max |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,035 | 0.035 | 0.035 | Exact |
| Cr | 1,50-1,80 | 1.500 | 1.800 | Range |
| Mn | 0,40-0,70 | 0.400 | 0.700 | Range |
| Mo | 0,20-0,35 | 0.200 | 0.350 | 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
Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni.
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
5 conditions · 52 valuessteelnumber| Thicknessmm | RmN/mm² | A% |
|---|---|---|
| 16 – 40 | 950 – 1150 | 11 |
| 40 – 100 | 900 – 1100 | 13 |
| 100 – 160 | 850 – 1050 | 14 |
| 160 – 250 | 800 – 1000 | 15 |
splav| Delivery state | RmN/mm² | A5% | HB |
|---|---|---|---|
| Pipe, GOST 21729-76 | 392 | 20 | — |
| 38Kh2MYuА ( 38Х2МЮА ) (annealing) , GOST 4543-71 | — | — | 229 |
| 38Kh2MYuА ( 38Х2МЮА ) (cold-worked) , GOST 4543-71 | — | — | 255 |
steelnumber| Delivery state | HB |
|---|---|
| Soft annealed | 248 |
splav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Ø 30 | 980 | 835 | 14 | 50 | 880 |
splav| Temperature°C | Densityg/cm³ | Elastic modulusGPa | Thermal expansion coefficient10^-6/K | Thermal conductivityW/(m·K) | Specific heat capacityJ/(kg·K) |
|---|---|---|---|---|---|
| 20 | 7.71 | 209 | — | 33 | — |
| 100 | — | 202 | 11.5 | 33 | 496 |
| 200 | — | 194 | 11.8 | 32 | 517 |
| 300 | — | 190 | 12.7 | 31 | 533 |
| 400 | — | 181 | 13.4 | 20 | 546 |
| 500 | — | 174 | 13.9 | 20 | 575 |
| 600 | — | 162 | 14.7 | 28 | 609 |
| 700 | — | 147 | 14.9 | 27 | 638 |
| 800 | — | 137 | — | 27 | 676 |
1 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition.
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.
Heat treatment
Supply condition
- Nitriding
- Soft annealingBar, Rod, Flat product, Forging and Semi-finished product
- Quenching and TemperingBar, Flat product and Forging16≤d≤40
- Quenching and Temperingd=30
- Annealing and Tempering and NormalizingSupply condition
- Quenching and Tempering16≤d≤408≤t≤20
- Quenching and temperingTest specimen30
Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied.
Source: www.caishuku.com
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.8, a shared category, and a published range for Cr / Al 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.