AISI / SAE · United States · 20 designations

4520

4520 is a designation in AISI / SAE for the material held under material number 1.5423, also listed as 16Mo5. It is a material in the category Heat-resistant structural steels. We list 20 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, UNE and UNI.

Material no. 1.5423
Category Heat-resistant structural steels · 62 grades
Designations 20

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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

20 designations · 6 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 2

UNSUnited States · 10

AISI / SAEUnited States · 3

BSUnited Kingdom · 1

1503-245-420Indicative

UNESpain · 3

UNIItaly · 1

16Mo5Indicative

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

Chemical composition

6 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 98.2 %Mn — 0.7 %Mo — 0.6 %Si — 0.3 %Traces & impurities · 0.2 %

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

Element	% by weight
	0.12–0.2
	0.15–0.5
	0.5–0.8
	0.04
	0.04
	0.45–0.65

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	0,12-0,20	0.120	0.200	Range
Si	0,15-0,50	0.150	0.500	Range
P	0,04	0.040	0.040	Exact
S	0,04	0.040	0.040	Exact
Mn	0,50-0,80	0.500	0.800	Range
Mo	0,45-0,65	0.450	0.650	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

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.

17MnMoCrV3-61.5405

Mn 0,60-0,80 · Mo 0,50-0,60