26MnMoB6-4
26MnMoB6-4 is a material in the category Heat-resistant structural steels, held under material number 1.5465. Its recorded composition includes C 0.25–0.3%, Si 0.3–0.6%, Cr 0.25–0.5%, Mn 1.25–1.5% and Ni 0.25–0.5%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³.
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.
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 |
|---|---|
0.25–0.3 | |
0.3–0.6 | |
1.25–1.5 | |
0.025 | |
0.025 | |
0.25–0.5 | |
0.3–0.45 | |
0.25–0.5 | |
≤ 0.05 | |
≤ 0.25 | |
0.001–0.004 |
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 |
|---|---|---|---|---|
| B | 0,001-0,0040 | 0.001 | 0.004 | Range |
| C | 0,25-0,30 | 0.250 | 0.300 | Range |
| Si | 0,30-0,60 | 0.300 | 0.600 | Range |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,025 | 0.025 | 0.025 | Exact |
| V | ≤0,05 | — | 0.050 | Max |
| Cr | 0,25-0,50 | 0.250 | 0.500 | Range |
| Mn | 1,25-1,50 | 1.250 | 1.500 | Range |
| Ni | 0,25-0,50 | 0.250 | 0.500 | Range |
| Cu | ≤0,25 | — | 0.250 | Max |
| Mo | 0,30-0,45 | 0.300 | 0.450 | 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 1.5, a shared category, and a published range for Mn / Si 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.
Mn 1,40-1,70 · Si 0,20-0,50
- ΔMn 0.17
- ΔSi 0.10
- 8 designations
Mn 1,20-1,80 · Si ≤0,60
- ΔMn 0.13
- ΔSi 0.15
- 1 designations
Mn 1,50-1,80 · Si ≤0,60
- ΔMn 0.27
- ΔSi 0.15
- 2 designations
Mn 1,50-1,80 · Si ≤0,60
- ΔMn 0.27
- ΔSi 0.15
- 1 designations
Mn 0,90-1,50 · Si ≤0,40
- ΔMn 0.18
- ΔSi 0.25
- 4 designations
Mn 0,95-1,25 · Si 0,55-0,75
- ΔMn 0.27
- ΔSi 0.20
- 1 designations
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