40Cr10
40Cr10 is a designation in STAS for the material held under material number 1.7034, also listed as 37Cr4. It is a material in the category Quenched and tempered steels. We list 104 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, COPANT, SRPS, MSZ, STAS, AS / NZS, BDS, ÖNORM, NBN and KS.
If you came for one of these
The most-used names for this grade.About Quenched and tempered steels
Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
104 designations · 24 standards · nothing hidden- 40Cr10Indicative
- 40Cr10qIndicative
- 40Cr10XIndicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
6 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 |
|---|---|
0.34–0.41 | |
≤ 0.4 | |
0.6–0.9 | |
0.035 | |
0.035 | |
0.9–1.2 |
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 | 0,34-0,41 | 0.340 | 0.410 | Range |
| Si | ≤0,40 | — | 0.400 | Max |
| P | 0,035 | 0.035 | 0.035 | Exact |
| S | 0,035 | 0.035 | 0.035 | Exact |
| Cr | 0,90-1,20 | 0.900 | 1.200 | Range |
| Mn | 0,60-0,90 | 0.600 | 0.900 | 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, Mo.
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 · 79 valuessplav| Delivery state | RmN/mm² | A5% | HB |
|---|---|---|---|
| Pipe, GOST 8731-87 | 657 | 9 | — |
| Pipe cooling strain, GOST 8733-74 | 618 | 14 | — |
| (annealing) , GOST 4543-71 | — | — | 217 |
| Pipe GOST 8731-87 | — | — | 269 |
| Pipe GOST 8733-74 | — | — | 217 |
| Bar GOST 10702-78 | — | — | 179 |
steelnumber| Thicknessmm | A% · Lo = 5,65 √So |
|---|---|
| ≤ 16 | 11 |
| 16 – 40 | 13 |
| 40 – 100 | 14 |
steelnumber| Delivery state | HB |
|---|---|
| Treated to improve shearability | 255 |
steelnumber| Delivery state | HB |
|---|---|
| Soft annealed | 235 |
splav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Ø 25 | 980 | 785 | 10 | 45 | 590 |
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 | 7.82 | 214 | — | — | — | 210 |
| 100 | 7.8 | 211 | 11.9 | 46 | 466 | 285 |
| 200 | 7.77 | 206 | 12.5 | 42.7 | 508 | 346 |
| 300 | 7.74 | 203 | 13.2 | 42.3 | 529 | 425 |
| 400 | 7.7 | 185 | 13.8 | 38.5 | 563 | 528 |
| 500 | 7.67 | 176 | 14.1 | 35.6 | 592 | 642 |
| 600 | 7.63 | 164 | 14.4 | 31.9 | 622 | 780 |
| 700 | 7.59 | 143 | 14.6 | 28.8 | 634 | 936 |
| 800 | 7.61 | 132 | — | 26 | 664 | 1100 |
| 900 | 7.56 | — | — | 26.7 | — | 1140 |
| 1000 | 7.51 | — | — | 28 | — | 1170 |
| 1100 | 7.47 | — | — | 28.8 | — | 120 |
| 1200 | 7.43 | — | — | — | — | 1230 |
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
GB /T 6478-2015
- Quenching820–860 °CQuenchant Oil or Water
- Tempering540–680 °C
GB T 6478-2001
- Quenching820–860 °CQuenchant Water or Oil
- Tempering540–680 °C
Supply condition
- Annealing or Tempering
- Annealing
- Annealing
- Quenching and Tempering
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 1.7, a shared category, and a published range for Cr / Mn 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.
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 28 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 56 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 67 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 13 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 10 designations
Cr 0,90-1,20 · Mn 0,60-0,90
- ΔCr 0.00
- ΔMn 0.00
- 20 designations
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.