27MnMo3-3
27MnMo3-3 is a material in the category Heat-resistant structural steels, held under material number 1.5420. Its recorded composition includes C 0.24–0.3%, Si 0.2–0.35%, P 0.035%, Mn 0.6–1% and Mo 0.2–0.3%. 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
6 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 |
|---|---|
0.24–0.3 | |
0.2–0.35 | |
0.6–1 | |
0.035 | |
0.035 | |
0.2–0.3 |
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 | 0,24-0,30 | 0.240 | 0.300 | Range |
| Si | 0,20-0,35 | 0.200 | 0.350 | Range |
| P | 0,035 | 0.035 | 0.035 | Exact |
| S | 0,035 | 0.035 | 0.035 | Exact |
| Mn | 0,60-1,00 | 0.600 | 1.000 | Range |
| Mo | 0,20-0,30 | 0.200 | 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.
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 0,70-1,05 · Si 0,20-0,35
- ΔMn 0.07
- ΔSi 0.00
- 1 designations
Mn 0,50-1,00 · Si ≤0,60
- ΔMn 0.05
- ΔSi 0.02
- 6 designations
Mn 0,70-1,00 · Si 0,15-0,25
- ΔMn 0.05
- ΔSi 0.08
- 3 designations
Mn ≤1,50 · Si ≤0,40
- ΔMn 0.05
- ΔSi 0.08
- 2 designations
Mn 0,60-0,80 · Si 0,15-0,35
- ΔMn 0.10
- ΔSi 0.03
- 1 designations
Mn 0,60-0,80 · Si 0,10-0,35
- ΔMn 0.10
- ΔSi 0.05
- 1 designations
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