K12003
K12003 is a designation in UNS for the material held under material number 1.8812, also listed as 18MnMoV5-2. It is a material in the category Heat-resistant structural steels. We list 7 designations recorded for this grade, in the standards DIN / EN and UNS.
If you came for one of these
The most-used names for this grade.About Heat-resistant structural steels
Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
7 designations · 2 standards · nothing hiddenEvery designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.
Chemical composition
8 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 |
|---|---|
≤ 0.2 | |
0.2–0.5 | |
1–1.5 | |
0.03 | |
0.025 | |
0.1–0.3 | |
0.05–0.1 | |
0.02 |
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 | ≤0,20 | — | 0.200 | Max |
| N | 0,02 | 0.020 | 0.020 | Exact |
| Si | 0,20-0,50 | 0.200 | 0.500 | Range |
| P | 0,03 | 0.030 | 0.030 | Exact |
| S | 0,025 | 0.025 | 0.025 | Exact |
| V | 0,05-0,10 | 0.050 | 0.100 | Range |
| Mn | 1,00-1,50 | 1.000 | 1.500 | Range |
| Mo | 0,10-0,30 | 0.100 | 0.300 | 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, Cr.
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.