55NiCrMoV7
55NiCrMoV7 is a material in the category Tool steels for hot work, held under material number 1.2714. We list 30 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, ISO, JIS, GB, GOST, UNI, SS, ČSN, PN, SRPS, STN and ÖNORM. Its recorded composition includes C 0.5–0.6%, Cr 0.8–1.2%, Mn 0.6–0.9%, Ni 1.5–1.8% and Mo 0.35–0.55%. Recorded mechanical properties include Rm 1570 N/mm², Re 1420 N/mm², A5 9%, HB 241–248, Z 35% and KCU 340 kJ/m²; these figures vary with the delivery condition and dimension. Its recorded density is 7.85 g/cm³. Further recorded physical values: λ 38–46 W/(m·K), α 12.6–14.2 ·10⁻⁶/K and ρ el. 160–300 nΩ·m; several of these are temperature-dependent. Recorded transformation points: Ac1 730 °C, Ac3 780 °C, Ar1 610 °C and Ar3 640 °C. It is recorded as not intended for welding.
If you came for one of these
The most-used names for this grade.About Tool steels for hot work
Tool steels for hot work are alloy steels designed for tooling that operates in contact with heated metal. They are characterised by hot hardness, wear resistance, toughness and resistance to thermal fatigue, making them suitable for dies, moulds, punches and other forging, extrusion and die-casting tools.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
31 designations · 16 standards · nothing hidden- 55NiCrMoV6Indicative
- 55NiCrMoV7This grade’s own name
- 56NiCrMoV7This grade’s own nameWithdrawn
- 55NiCrMoV7Indicative
- 56NiCrMoV7Indicative
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
9 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 |
|---|---|
0.5–0.6 | |
0.1–0.4 | |
0.6–0.9 | |
0.03 | |
0.03 | |
0.8–1.2 | |
0.35–0.55 | |
1.5–1.8 | |
0.05–0.15 |
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 | 0,50-0,60 | 0.500 | 0.600 | Range |
| Si | 0,10-0,40 | 0.100 | 0.400 | Range |
| P | 0,03 | 0.030 | 0.030 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| V | 0,05-0,15 | 0.050 | 0.150 | Range |
| Cr | 0,80-1,20 | 0.800 | 1.200 | Range |
| Mn | 0,60-0,90 | 0.600 | 0.900 | Range |
| Ni | 1,50-1,80 | 1.500 | 1.800 | Range |
| Mo | 0,35-0,55 | 0.350 | 0.550 | 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
computed from composition · °CThese four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either.
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 · 21 valuessteeljis| Delivery state | HB | HRC |
|---|---|---|
| Annealed | 248 | — |
| Quenched and tempered | — | 42 |
steelnumber| Delivery state | HB |
|---|---|
| Soft annealed | 248 |
splav| Dimensionmm | RmN/mm² | ReN/mm² | A5% | Z% | KCUkJ/m² |
|---|---|---|---|---|---|
| 100 - 200 | 1570 | 1420 | 9 | 35 | 340 |
splav| Delivery state | HB |
|---|---|
| (annealing) , GOST 5950-2000 | 241 |
splav| Temperature°C | Thermal expansion coefficient10^-6/K | Thermal conductivityW/(m·K) | Electrical resistivitynΩ·m |
|---|---|---|---|
| 100 | — | 38 | 300 |
| 200 | 12.6 | 40 | 250 |
| 300 | — | 42 | 200 |
| 400 | — | 42 | 160 |
| 500 | — | 44 | — |
| 600 | 14.2 | 46 | — |
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 1.2, a shared category, and a published range for Ni / Cr 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.