F.320.C
F.320.C is a designation in UNE for the material held under material number 1.4873, also listed as X45CrNiW18-9. It is a material in the category Valve steels. We list 25 designations recorded for this grade, in the standards DIN / EN, BS, AFNOR, UNE, JIS, GOST, ČSN, PN, SRPS, MSZ, STAS and BDS.
- Material no. 1.4873
- Category Valve steels · 14 grades
- Designations 25
If you came for one of these
The most-used names for this grade.About Valve steels
Valve steels are alloy steels developed for valve components exposed to heat, pressure, wear, and corrosive service conditions. They are characterised by combinations of strength, hardness, toughness, and resistance to oxidation or corrosion suited to the operating environment. Typical uses include engine valves and industrial valve parts where reliable performance and dimensional stability are required.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Also known as
25 designations · 12 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 |
|---|---|
0.4–0.5 | |
2–3 — | |
0.8–1.5 | |
0.045 | |
0.03 | |
17–19 | |
8–10 | |
0.8–1.2 |
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 | 0,40-0,50 | 0.400 | 0.500 | Range |
| Si | 2,00-3,00 | 2.000 | 3.000 | Range |
| P | 0,045 | 0.045 | 0.045 | Exact |
| S | 0,03 | 0.030 | 0.030 | Exact |
| Cr | 17,0-19,0 | 17.000 | 19.000 | Range |
| Mn | 0,80-1,50 | 0.800 | 1.500 | Range |
| Ni | 8,00-10,0 | 8.000 | 10.000 | Range |
| W | 0,80-1,20 | 0.800 | 1.200 | 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.
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.