1.8564
1.8564 is the material number this entry is held under. It is a material in the category Special steels for aviation and aerospace.
- Material no. 1.8564
- Category Special steels for aviation and aerospace · 39 grades
About Special steels for aviation and aerospace
Special steels for aviation and aerospace are engineered steels designed to provide controlled mechanical properties and reliable performance in demanding service. Their alloying and heat-treatment capabilities support components that require a combination of strength, toughness and fatigue resistance, including aircraft structures and engine parts.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
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 |
|---|---|
0.28–0.35 | |
0.1–0.4 | |
0.4–0.7 | |
0.025 | |
0.02 | |
2.8–3.3 | |
0.3–0.5 | |
0.3 |
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 | 0,28-0,35 | 0.280 | 0.350 | Range |
| Si | 0,10-0,40 | 0.100 | 0.400 | Range |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,02 | 0.020 | 0.020 | Exact |
| Cr | 2,80-3,30 | 2.800 | 3.300 | Range |
| Mn | 0,40-0,70 | 0.400 | 0.700 | Range |
| Ni | 0,3 | 0.300 | 0.300 | Exact |
| Mo | 0,30-0,50 | 0.300 | 0.500 | 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.
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