31NiCr14
31NiCr14 is a material in the category Quenched and tempered steels, held under material number 1.5755. We list 17 designations recorded for this grade, in the standards BS, AFNOR, UNE, JIS, GOST, ČSN, PN, SRPS and BDS. Its recorded composition includes C 0.27–0.35%, Si 0.15–0.35%, Cr 0.55–0.95%, Mn 0.4–0.8% and Ni 3.25–3.75%. Recorded mechanical properties include Rm 980–1670 N/mm², Re 785–1420 N/mm², A5 10–13%, HB 241, Z 45–50% and KCU 490–780 kJ/m²; these figures vary with the delivery condition and dimension. Its recorded density is 7.6–7.85 g/cm³. Further recorded physical values: E 171–215 GPa, λ 27–36 W/(m·K), α 10.8–13.5 ·10⁻⁶/K, cp 494–703 J/(kg·K) and ρ el. 268–981 nΩ·m; several of these are temperature-dependent. Recorded transformation points: Ac1 700 °C, Ac3 800 °C, Ar1 610 °C and Ar3 680 °C. Its weldability is recorded as limited.
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
18 designations · 10 standards · nothing hidden- 31NiCr14This grade’s own nameWithdrawn
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
7 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 |
|---|---|
0.27–0.35 | |
0.15–0.35 | |
0.4–0.8 | |
0.035 | |
0.035 | |
0.55–0.95 | |
3.25–3.75 |
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 | 0,27-0,35 | 0.270 | 0.350 | Range |
| Si | 0,15-0,35 | 0.150 | 0.350 | Range |
| P | 0,035 | 0.035 | 0.035 | Exact |
| S | 0,035 | 0.035 | 0.035 | Exact |
| Cr | 0,55-0,95 | 0.550 | 0.950 | Range |
| Mn | 0,40-0,80 | 0.400 | 0.800 | Range |
| Ni | 3,25-3,75 | 3.250 | 3.750 | 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: 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
4 conditions · 65 valuessplav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Ø 5 | 1670 | 1420 | 13 | 50 | 660 |
| Ø 20 | 1670 | 1370 | 12 | 45 | 490 |
splav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| Ø 25 | 980 | 785 | 10 | 50 | 780 |
splav| Delivery state | HB |
|---|---|
| (annealing) , GOST 4543-71 | 241 |
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 | 7.85 | 215 | — | 34 | — | 268 |
| 100 | 7.83 | 207 | 10.8 | 35 | 494 | 317 |
| 200 | 7.8 | 195 | 11.5 | 36 | 504 | 387 |
| 300 | 7.77 | 187 | 12.2 | 36 | 518 | 469 |
| 400 | 7.73 | 175 | 12.8 | 36 | 536 | 567 |
| 500 | 7.7 | 171 | 13.2 | 35 | 558 | 681 |
| 600 | 7.67 | — | 13.5 | 31 | 587 | 817 |
| 700 | 7.69 | — | — | 28 | 657 | 981 |
| 800 | 7.65 | — | — | 27 | 703 | — |
| 900 | 7.6 | — | — | — | 695 | — |
| 1000 | — | — | — | — | 687 | — |
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.
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