Material number · Europe · 5 designations

1.5425

1.5425 is the material number of the grade also listed as 11MnMo4-5. It is a material in the category Heat-resistant structural steels. We list 5 designations recorded for this grade, in the standards DIN / EN and UNS.

Material no. 1.5425
Category Heat-resistant structural steels · 62 grades
Designations 5

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If you came for one of these

The most-used names for this grade.

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.

Also known as

5 designations · 2 standards · nothing hidden

This grade’s own namerecorded in our sources as this grade’s own designation under that standard.

Indicativetaken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.

Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

DIN / ENEurope · 1

11MnMo4-5This grade’s own name

UNSUnited States · 4

Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.

Chemical composition

10 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 97.7 %Mn — 1 %Mo — 0.6 %Cu — 0.2 %Traces & impurities · 0.6 %

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

Element	% by weight
	0.09–0.14
	0.08–0.22
	0.85–1.15
	0.02
	0.02
	≤ 0.12
	0.48–0.62
	0.12
	≤ 0.17
	≤ 0.03

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	0,09-0,14	0.090	0.140	Range
Al	≤0,030	—	0.030	Max
Si	0,08-0,22	0.080	0.220	Range
P	0,02	0.020	0.020	Exact
S	0,02	0.020	0.020	Exact
Cr	≤0,12	—	0.120	Max
Mn	0,85-1,15	0.850	1.150	Range
Ni	0,12	0.120	0.120	Exact
Cu	≤0,17	—	0.170	Max
Mo	0,48-0,62	0.480	0.620	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 · °C

Predicted Ae3821°C

Predicted Ae1713°C

Predicted Acm377°C

Predicted Bs557°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 1.5, a shared category, and a published range for Mn / Mo 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.

G18Mo51.5422

Mn 0,80-1,20 · Mo 0,45-0,65