DIN / EN · Europe · 10 designations

E255

E255 is a material in the category Quenched and tempered steels, held under material number 1.0408. We list 9 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE and ČSN. Its recorded composition includes C ≤ 0.21%, Si ≤ 0.35%, P 0.025%, S 0.025% and Mn 0.4–1.1%. Its recorded density is 7.85 g/cm³.

Material no. 1.0408
Category Quenched and tempered steels · 133 grades
Designations 10

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If you came for one of these

The most-used names for this grade.

About Quenched and tempered steels

Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required.

This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.

Also known as

10 designations · 4 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

Superseded bythe current name this withdrawn designation was replaced by — the same grade under its present designation, the one to order by today.

DIN / ENEurope · 4

E255This grade’s own name
S255GTThis grade’s own name
FormerlySt45
St 45.8This grade’s own name
St45IndicativeWithdrawn
Superseded byS255GT

UNSUnited States · 2

AISI / SAEUnited States · 1

1020This grade’s own name

ČSNCzechia · 3

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

Chemical composition

5 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 98.6 %Mn — 0.8 %Si — 0.4 %C — 0.2 %Traces & impurities · 0 %

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

Element	% by weight
	≤ 0.21
	≤ 0.35
	0.4–1.1
	0.025
	0.025

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	≤0,21	—	0.210	Max
Si	≤0,35	—	0.350	Max
P	0,025	0.025	0.025	Exact
S	0,025	0.025	0.025	Exact
Mn	0,40-1,10	0.400	1.100	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, Mo.

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 1.0, 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.

1.05351.0535

Mn 0,60-0,90 · Si ≤0,40