17NiCrMnMo5-5
17NiCrMnMo5-5 is a material in the category High-strength steels, held under material number 1.8718. Its recorded composition includes C 0.14–0.21%, Cr 1–1.5%, Mn 0.95–1.3%, Ni 1.2–1.5% and Mo 0.4–0.6%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³.
About High-strength steels
High-strength steels are steels designed to carry high loads while resisting deformation. They are used for load-bearing structures, vehicles and machinery where strength, durability and reduced material weight are important.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
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 |
|---|---|
0.14–0.21 | |
0.15–0.35 | |
0.95–1.3 | |
0.025 | |
0.025 | |
1–1.5 | |
0.4–0.6 | |
1.2–1.5 | |
0.03–0.08 |
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 | 0,14-0,21 | 0.140 | 0.210 | Range |
| Si | 0,15-0,35 | 0.150 | 0.350 | Range |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,025 | 0.025 | 0.025 | Exact |
| V | 0,03-0,08 | 0.030 | 0.080 | Range |
| Cr | 1,00-1,50 | 1.000 | 1.500 | Range |
| Mn | 0,95-1,30 | 0.950 | 1.300 | Range |
| Ni | 1,20-1,50 | 1.200 | 1.500 | Range |
| Mo | 0,40-0,60 | 0.400 | 0.600 | 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.
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 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.