21MnCr4-3
21MnCr4-3 is a material in the category High-strength steels, held under material number 1.8711. Its recorded composition includes C ≤ 0.2%, Si approx. 0.7%, Cr approx. 0.8%, Mn approx. 1% and Mo ≥ 0.1%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³.
About High-strength steels
High-strength steels are steels designed to carry high loads while resisting deformation. They are used for load-bearing structures, vehicles and machinery where strength, durability and reduced material weight are important.
This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.
Chemical composition
7 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 | |
≈ 0.7 | |
≈ 1 | |
0.025 | |
0.025 | |
≈ 0.8 | |
≥ 0.1 |
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 |
| Si | ~0,70 | 0.700 | 0.700 | Indicative |
| P | 0,025 | 0.025 | 0.025 | Exact |
| S | 0,025 | 0.025 | 0.025 | Exact |
| Cr | ~0,80 | 0.800 | 0.800 | Indicative |
| Mn | ~1,00 | 1.000 | 1.000 | Indicative |
| Mo | ≥0,10 | 0.100 | — | Min |
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, 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.
Similar grades — and why
Selection rule, stated so you can disagree with it: same number class 1.8, a shared category, and a published range for Mn / Cr 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 ~1,00 · Cr ~0,80
- ΔMn 0.00
- ΔCr 0.00
- 1 designations
Mn ~1,00 · Cr ~0,80
- ΔMn 0.00
- ΔCr 0.00
- 1 designations
Mn ~1,00 · Cr ~0,80
- ΔMn 0.00
- ΔCr 0.00
- 1 designations
Mn ~1,00 · Cr ~0,80
- ΔMn 0.00
- ΔCr 0.00
- 1 designations
Mn ≤1,70 · Cr 0,50-1,20
- ΔMn 0.15
- ΔCr 0.05
- 1 designations
Mn 0,60-1,70 · Cr 0,50-1,00
- ΔMn 0.15
- ΔCr 0.05
- 1 designations
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