20CrMoV13-5-5
20CrMoV13-5-5 is a designation in DIN / EN for the material held under material number 1.7779, also listed as 20CrMoV13-5. It is a material in the category Hydrogen resistant steels. We list 3 designations recorded for this grade, in the standards DIN / EN and ČSN.
About Hydrogen resistant steels
Hydrogen resistant steels are steels designed to withstand hydrogen-related damage, including hydrogen embrittlement and hydrogen attack. They are used for pressure vessels, piping and process equipment exposed to hydrogen-containing environments, where resistance to hydrogen ingress and loss of toughness is important.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
3 designations · 2 standards · nothing hidden- 20CrMoV13-5This grade’s own nameWithdrawn
- 20CrMoV13-5-5This grade’s own name
Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
11 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 |
|---|---|
0.17–0.23 | |
0.15–0.35 | |
0.3–0.5 | |
0.025 | |
0.02 | |
3–3.3 | |
0.5–0.6 | |
0.3 | |
0.45–0.55 | |
≤ 0.3 | |
≤ 0.04 |
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 | 0,17-0,23 | 0.170 | 0.230 | Range |
| Al | ≤0,040 | — | 0.040 | Max |
| Si | 0,15-0,35 | 0.150 | 0.350 | Range |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,02 | 0.020 | 0.020 | Exact |
| V | 0,45-0,55 | 0.450 | 0.550 | Range |
| Cr | 3,00-3,30 | 3.000 | 3.300 | Range |
| Mn | 0,30-0,50 | 0.300 | 0.500 | Range |
| Ni | 0,3 | 0.300 | 0.300 | Exact |
| Cu | ≤0,30 | — | 0.300 | Max |
| Mo | 0,50-0,60 | 0.500 | 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.
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.