DIN / EN · Europe · 1 designation

21MnCr7-5

21MnCr7-5 is a material in the category High-strength steels, held under material number 1.8706. Its recorded composition includes C ≤ 0.25%, Si ≤ 0.7%, Cr 0.8–1.6%, Mn ≤ 2% and Cu ≤ 0.6%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³.

Material no. 1.8706
Category High-strength steels · 128 grades
Designations 1

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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

9 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 94.3 %Mn — 2 %Cr — 1.2 %Si — 0.7 %Traces & impurities · 1.8 %

Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.

Element	% by weight
	≤ 0.25
	≤ 0.7
	≤ 2
	0.035
	0.035
	0.8–1.6
	≤ 0.3
	0.6
	≤ 0.6

0.01 %0.1 %1 %10 %100 %

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	≤0,25	—	0.250	Max
Si	≤0,70	—	0.700	Max
P	0,035	0.035	0.035	Exact
S	0,035	0.035	0.035	Exact
Cr	0,80-1,60	0.800	1.600	Range
Mn	≤2,00	—	2.000	Max
Ni	0,6	0.600	0.600	Exact
Cu	≤0,60	—	0.600	Max
Mo	≤0,30	—	0.300	Max

(Nb+V+Ti)≤0,20
(Nb+V+Ti)≤0,20
(Nb+V+Ti)≤0,20

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 · °C

Predicted Ae3800°C

Predicted Ae1739°C

Predicted Acm531°C

Predicted Bs477°C

These 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

Density7,85g/cm³Exact

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 Cr / Mn 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.

21MnCr6-51.8705

Cr 0,80-1,60 · Mn ≤1,90