DIN / EN · Europe · 4 designations

StE240.7TM

StE240.7TM is a designation in DIN / EN for the material held under material number 1.0418, also listed as L245MB. It is a material in the category Fine-grain structural steels. We list 4 designations recorded for this grade, in the standards DIN / EN and UNS.

Material no. 1.0418
Category Fine-grain structural steels · 50 grades
Designations 4

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If you came for one of these

The most-used names for this grade.

About Fine-grain structural steels

Fine-grain structural steel is a name for structural steels whose properties are particularly suitable for welding. They have a higher yield strength than comparable steels. Due to the negative influence of carbon on the weldability of a material, the maximum carbon content in fine-grained structural steels is less than 0.2%. These properties are achieved in steelmaking by the addition of oxygen and nitrogen-binding elements. The fine grain in the metallurgical structure is achieved by alloying elements whose nitrides and carbides only dissolve at higher temperatures. With the same composition, they are stronger and tougher than coarse-grained steels. Fine-grained structural steels are used above all in reinforced concrete structures such as bridges, in the construction of cranes, hydraulic cylinders or other welded structures due to their special welding suitability and in the offshore area.

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

Also known as

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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

L245MBThis grade’s own name
StE240.7TMIndicative

UNSUnited States · 2

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

Chemical composition

13 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 96.8 %Mn — 1.5 %Si — 0.5 %Cr — 0.3 %Traces & impurities · 1 %

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

Element	% by weight
	≤ 0.16
	≤ 0.45
	≤ 1.5
	0.025
	0.02
	≤ 0.3
	≤ 0.1
	≤ 0.3
	≤ 0.04
	≤ 0.25
	0.015–0.06
	≤ 0.04
	0.012

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	≤0,16	—	0.160	Max
N	0,012	0.012	0.012	Exact
Al	0,015-0,060	0.015	0.060	Range
Si	≤0,45	—	0.450	Max
P	0,025	0.025	0.025	Exact
S	0,02	0.020	0.020	Exact
V	≤0,040	—	0.040	Max
Cr	≤0,30	—	0.300	Max
Mn	≤1,50	—	1.500	Max
Ni	≤0,30	—	0.300	Max
Cu	≤0,25	—	0.250	Max
Nb	≤0,04	—	0.040	Max
Mo	≤0,10	—	0.100	Max

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 Ae3819°C

Predicted Ae1715°C

Predicted Acm403°C

Predicted Bs556°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 1.0, 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.

RoSt 52-31.0576

Mn ≤1,60 · Si ≤0,55